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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 <errno.h>
12#include <inttypes.h>
13#include <linux/bitops.h>
14#include <api/fs/fs.h>
15#include <api/fs/tracing_path.h>
16#include <traceevent/event-parse.h>
17#include <linux/hw_breakpoint.h>
18#include <linux/perf_event.h>
19#include <linux/compiler.h>
20#include <linux/err.h>
21#include <sys/ioctl.h>
22#include <sys/resource.h>
23#include <sys/types.h>
24#include <dirent.h>
25#include "asm/bug.h"
26#include "callchain.h"
27#include "cgroup.h"
28#include "event.h"
29#include "evsel.h"
30#include "evlist.h"
31#include "util.h"
32#include "cpumap.h"
33#include "thread_map.h"
34#include "target.h"
35#include "perf_regs.h"
36#include "debug.h"
37#include "trace-event.h"
38#include "stat.h"
39#include "memswap.h"
40#include "util/parse-branch-options.h"
41
42#include "sane_ctype.h"
43
44struct perf_missing_features perf_missing_features;
45
46static clockid_t clockid;
47
48static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused)
49{
50 return 0;
51}
52
53void __weak test_attr__ready(void) { }
54
55static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused)
56{
57}
58
59static struct {
60 size_t size;
61 int (*init)(struct perf_evsel *evsel);
62 void (*fini)(struct perf_evsel *evsel);
63} perf_evsel__object = {
64 .size = sizeof(struct perf_evsel),
65 .init = perf_evsel__no_extra_init,
66 .fini = perf_evsel__no_extra_fini,
67};
68
69int perf_evsel__object_config(size_t object_size,
70 int (*init)(struct perf_evsel *evsel),
71 void (*fini)(struct perf_evsel *evsel))
72{
73
74 if (object_size == 0)
75 goto set_methods;
76
77 if (perf_evsel__object.size > object_size)
78 return -EINVAL;
79
80 perf_evsel__object.size = object_size;
81
82set_methods:
83 if (init != NULL)
84 perf_evsel__object.init = init;
85
86 if (fini != NULL)
87 perf_evsel__object.fini = fini;
88
89 return 0;
90}
91
92#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
93
94int __perf_evsel__sample_size(u64 sample_type)
95{
96 u64 mask = sample_type & PERF_SAMPLE_MASK;
97 int size = 0;
98 int i;
99
100 for (i = 0; i < 64; i++) {
101 if (mask & (1ULL << i))
102 size++;
103 }
104
105 size *= sizeof(u64);
106
107 return size;
108}
109
110/**
111 * __perf_evsel__calc_id_pos - calculate id_pos.
112 * @sample_type: sample type
113 *
114 * This function returns the position of the event id (PERF_SAMPLE_ID or
115 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
116 * sample_event.
117 */
118static int __perf_evsel__calc_id_pos(u64 sample_type)
119{
120 int idx = 0;
121
122 if (sample_type & PERF_SAMPLE_IDENTIFIER)
123 return 0;
124
125 if (!(sample_type & PERF_SAMPLE_ID))
126 return -1;
127
128 if (sample_type & PERF_SAMPLE_IP)
129 idx += 1;
130
131 if (sample_type & PERF_SAMPLE_TID)
132 idx += 1;
133
134 if (sample_type & PERF_SAMPLE_TIME)
135 idx += 1;
136
137 if (sample_type & PERF_SAMPLE_ADDR)
138 idx += 1;
139
140 return idx;
141}
142
143/**
144 * __perf_evsel__calc_is_pos - calculate is_pos.
145 * @sample_type: sample type
146 *
147 * This function returns the position (counting backwards) of the event id
148 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
149 * sample_id_all is used there is an id sample appended to non-sample events.
150 */
151static int __perf_evsel__calc_is_pos(u64 sample_type)
152{
153 int idx = 1;
154
155 if (sample_type & PERF_SAMPLE_IDENTIFIER)
156 return 1;
157
158 if (!(sample_type & PERF_SAMPLE_ID))
159 return -1;
160
161 if (sample_type & PERF_SAMPLE_CPU)
162 idx += 1;
163
164 if (sample_type & PERF_SAMPLE_STREAM_ID)
165 idx += 1;
166
167 return idx;
168}
169
170void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
171{
172 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
173 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
174}
175
176void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
177 enum perf_event_sample_format bit)
178{
179 if (!(evsel->attr.sample_type & bit)) {
180 evsel->attr.sample_type |= bit;
181 evsel->sample_size += sizeof(u64);
182 perf_evsel__calc_id_pos(evsel);
183 }
184}
185
186void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
187 enum perf_event_sample_format bit)
188{
189 if (evsel->attr.sample_type & bit) {
190 evsel->attr.sample_type &= ~bit;
191 evsel->sample_size -= sizeof(u64);
192 perf_evsel__calc_id_pos(evsel);
193 }
194}
195
196void perf_evsel__set_sample_id(struct perf_evsel *evsel,
197 bool can_sample_identifier)
198{
199 if (can_sample_identifier) {
200 perf_evsel__reset_sample_bit(evsel, ID);
201 perf_evsel__set_sample_bit(evsel, IDENTIFIER);
202 } else {
203 perf_evsel__set_sample_bit(evsel, ID);
204 }
205 evsel->attr.read_format |= PERF_FORMAT_ID;
206}
207
208/**
209 * perf_evsel__is_function_event - Return whether given evsel is a function
210 * trace event
211 *
212 * @evsel - evsel selector to be tested
213 *
214 * Return %true if event is function trace event
215 */
216bool perf_evsel__is_function_event(struct perf_evsel *evsel)
217{
218#define FUNCTION_EVENT "ftrace:function"
219
220 return evsel->name &&
221 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
222
223#undef FUNCTION_EVENT
224}
225
226void perf_evsel__init(struct perf_evsel *evsel,
227 struct perf_event_attr *attr, int idx)
228{
229 evsel->idx = idx;
230 evsel->tracking = !idx;
231 evsel->attr = *attr;
232 evsel->leader = evsel;
233 evsel->unit = "";
234 evsel->scale = 1.0;
235 evsel->evlist = NULL;
236 evsel->bpf_fd = -1;
237 INIT_LIST_HEAD(&evsel->node);
238 INIT_LIST_HEAD(&evsel->config_terms);
239 perf_evsel__object.init(evsel);
240 evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
241 perf_evsel__calc_id_pos(evsel);
242 evsel->cmdline_group_boundary = false;
243 evsel->metric_expr = NULL;
244 evsel->metric_name = NULL;
245 evsel->metric_events = NULL;
246 evsel->collect_stat = false;
247 evsel->pmu_name = NULL;
248}
249
250struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
251{
252 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
253
254 if (evsel != NULL)
255 perf_evsel__init(evsel, attr, idx);
256
257 if (perf_evsel__is_bpf_output(evsel)) {
258 evsel->attr.sample_type |= (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
259 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
260 evsel->attr.sample_period = 1;
261 }
262
263 return evsel;
264}
265
266static bool perf_event_can_profile_kernel(void)
267{
268 return geteuid() == 0 || perf_event_paranoid() == -1;
269}
270
271struct perf_evsel *perf_evsel__new_cycles(bool precise)
272{
273 struct perf_event_attr attr = {
274 .type = PERF_TYPE_HARDWARE,
275 .config = PERF_COUNT_HW_CPU_CYCLES,
276 .exclude_kernel = !perf_event_can_profile_kernel(),
277 };
278 struct perf_evsel *evsel;
279
280 event_attr_init(&attr);
281
282 if (!precise)
283 goto new_event;
284 /*
285 * Unnamed union member, not supported as struct member named
286 * initializer in older compilers such as gcc 4.4.7
287 *
288 * Just for probing the precise_ip:
289 */
290 attr.sample_period = 1;
291
292 perf_event_attr__set_max_precise_ip(&attr);
293 /*
294 * Now let the usual logic to set up the perf_event_attr defaults
295 * to kick in when we return and before perf_evsel__open() is called.
296 */
297 attr.sample_period = 0;
298new_event:
299 evsel = perf_evsel__new(&attr);
300 if (evsel == NULL)
301 goto out;
302
303 /* use asprintf() because free(evsel) assumes name is allocated */
304 if (asprintf(&evsel->name, "cycles%s%s%.*s",
305 (attr.precise_ip || attr.exclude_kernel) ? ":" : "",
306 attr.exclude_kernel ? "u" : "",
307 attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0)
308 goto error_free;
309out:
310 return evsel;
311error_free:
312 perf_evsel__delete(evsel);
313 evsel = NULL;
314 goto out;
315}
316
317/*
318 * Returns pointer with encoded error via <linux/err.h> interface.
319 */
320struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
321{
322 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
323 int err = -ENOMEM;
324
325 if (evsel == NULL) {
326 goto out_err;
327 } else {
328 struct perf_event_attr attr = {
329 .type = PERF_TYPE_TRACEPOINT,
330 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
331 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
332 };
333
334 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
335 goto out_free;
336
337 evsel->tp_format = trace_event__tp_format(sys, name);
338 if (IS_ERR(evsel->tp_format)) {
339 err = PTR_ERR(evsel->tp_format);
340 goto out_free;
341 }
342
343 event_attr_init(&attr);
344 attr.config = evsel->tp_format->id;
345 attr.sample_period = 1;
346 perf_evsel__init(evsel, &attr, idx);
347 }
348
349 return evsel;
350
351out_free:
352 zfree(&evsel->name);
353 free(evsel);
354out_err:
355 return ERR_PTR(err);
356}
357
358const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
359 "cycles",
360 "instructions",
361 "cache-references",
362 "cache-misses",
363 "branches",
364 "branch-misses",
365 "bus-cycles",
366 "stalled-cycles-frontend",
367 "stalled-cycles-backend",
368 "ref-cycles",
369};
370
371static const char *__perf_evsel__hw_name(u64 config)
372{
373 if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
374 return perf_evsel__hw_names[config];
375
376 return "unknown-hardware";
377}
378
379static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
380{
381 int colon = 0, r = 0;
382 struct perf_event_attr *attr = &evsel->attr;
383 bool exclude_guest_default = false;
384
385#define MOD_PRINT(context, mod) do { \
386 if (!attr->exclude_##context) { \
387 if (!colon) colon = ++r; \
388 r += scnprintf(bf + r, size - r, "%c", mod); \
389 } } while(0)
390
391 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
392 MOD_PRINT(kernel, 'k');
393 MOD_PRINT(user, 'u');
394 MOD_PRINT(hv, 'h');
395 exclude_guest_default = true;
396 }
397
398 if (attr->precise_ip) {
399 if (!colon)
400 colon = ++r;
401 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
402 exclude_guest_default = true;
403 }
404
405 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
406 MOD_PRINT(host, 'H');
407 MOD_PRINT(guest, 'G');
408 }
409#undef MOD_PRINT
410 if (colon)
411 bf[colon - 1] = ':';
412 return r;
413}
414
415static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
416{
417 int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
418 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
419}
420
421const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
422 "cpu-clock",
423 "task-clock",
424 "page-faults",
425 "context-switches",
426 "cpu-migrations",
427 "minor-faults",
428 "major-faults",
429 "alignment-faults",
430 "emulation-faults",
431 "dummy",
432};
433
434static const char *__perf_evsel__sw_name(u64 config)
435{
436 if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
437 return perf_evsel__sw_names[config];
438 return "unknown-software";
439}
440
441static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
442{
443 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
444 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
445}
446
447static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
448{
449 int r;
450
451 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
452
453 if (type & HW_BREAKPOINT_R)
454 r += scnprintf(bf + r, size - r, "r");
455
456 if (type & HW_BREAKPOINT_W)
457 r += scnprintf(bf + r, size - r, "w");
458
459 if (type & HW_BREAKPOINT_X)
460 r += scnprintf(bf + r, size - r, "x");
461
462 return r;
463}
464
465static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
466{
467 struct perf_event_attr *attr = &evsel->attr;
468 int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
469 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
470}
471
472const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
473 [PERF_EVSEL__MAX_ALIASES] = {
474 { "L1-dcache", "l1-d", "l1d", "L1-data", },
475 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
476 { "LLC", "L2", },
477 { "dTLB", "d-tlb", "Data-TLB", },
478 { "iTLB", "i-tlb", "Instruction-TLB", },
479 { "branch", "branches", "bpu", "btb", "bpc", },
480 { "node", },
481};
482
483const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
484 [PERF_EVSEL__MAX_ALIASES] = {
485 { "load", "loads", "read", },
486 { "store", "stores", "write", },
487 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
488};
489
490const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
491 [PERF_EVSEL__MAX_ALIASES] = {
492 { "refs", "Reference", "ops", "access", },
493 { "misses", "miss", },
494};
495
496#define C(x) PERF_COUNT_HW_CACHE_##x
497#define CACHE_READ (1 << C(OP_READ))
498#define CACHE_WRITE (1 << C(OP_WRITE))
499#define CACHE_PREFETCH (1 << C(OP_PREFETCH))
500#define COP(x) (1 << x)
501
502/*
503 * cache operartion stat
504 * L1I : Read and prefetch only
505 * ITLB and BPU : Read-only
506 */
507static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
508 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
509 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
510 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
511 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
512 [C(ITLB)] = (CACHE_READ),
513 [C(BPU)] = (CACHE_READ),
514 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
515};
516
517bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
518{
519 if (perf_evsel__hw_cache_stat[type] & COP(op))
520 return true; /* valid */
521 else
522 return false; /* invalid */
523}
524
525int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
526 char *bf, size_t size)
527{
528 if (result) {
529 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
530 perf_evsel__hw_cache_op[op][0],
531 perf_evsel__hw_cache_result[result][0]);
532 }
533
534 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
535 perf_evsel__hw_cache_op[op][1]);
536}
537
538static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
539{
540 u8 op, result, type = (config >> 0) & 0xff;
541 const char *err = "unknown-ext-hardware-cache-type";
542
543 if (type >= PERF_COUNT_HW_CACHE_MAX)
544 goto out_err;
545
546 op = (config >> 8) & 0xff;
547 err = "unknown-ext-hardware-cache-op";
548 if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
549 goto out_err;
550
551 result = (config >> 16) & 0xff;
552 err = "unknown-ext-hardware-cache-result";
553 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
554 goto out_err;
555
556 err = "invalid-cache";
557 if (!perf_evsel__is_cache_op_valid(type, op))
558 goto out_err;
559
560 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
561out_err:
562 return scnprintf(bf, size, "%s", err);
563}
564
565static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
566{
567 int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
568 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
569}
570
571static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
572{
573 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
574 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
575}
576
577const char *perf_evsel__name(struct perf_evsel *evsel)
578{
579 char bf[128];
580
581 if (evsel->name)
582 return evsel->name;
583
584 switch (evsel->attr.type) {
585 case PERF_TYPE_RAW:
586 perf_evsel__raw_name(evsel, bf, sizeof(bf));
587 break;
588
589 case PERF_TYPE_HARDWARE:
590 perf_evsel__hw_name(evsel, bf, sizeof(bf));
591 break;
592
593 case PERF_TYPE_HW_CACHE:
594 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
595 break;
596
597 case PERF_TYPE_SOFTWARE:
598 perf_evsel__sw_name(evsel, bf, sizeof(bf));
599 break;
600
601 case PERF_TYPE_TRACEPOINT:
602 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
603 break;
604
605 case PERF_TYPE_BREAKPOINT:
606 perf_evsel__bp_name(evsel, bf, sizeof(bf));
607 break;
608
609 default:
610 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
611 evsel->attr.type);
612 break;
613 }
614
615 evsel->name = strdup(bf);
616
617 return evsel->name ?: "unknown";
618}
619
620const char *perf_evsel__group_name(struct perf_evsel *evsel)
621{
622 return evsel->group_name ?: "anon group";
623}
624
625/*
626 * Returns the group details for the specified leader,
627 * with following rules.
628 *
629 * For record -e '{cycles,instructions}'
630 * 'anon group { cycles:u, instructions:u }'
631 *
632 * For record -e 'cycles,instructions' and report --group
633 * 'cycles:u, instructions:u'
634 */
635int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
636{
637 int ret = 0;
638 struct perf_evsel *pos;
639 const char *group_name = perf_evsel__group_name(evsel);
640
641 if (!evsel->forced_leader)
642 ret = scnprintf(buf, size, "%s { ", group_name);
643
644 ret += scnprintf(buf + ret, size - ret, "%s",
645 perf_evsel__name(evsel));
646
647 for_each_group_member(pos, evsel)
648 ret += scnprintf(buf + ret, size - ret, ", %s",
649 perf_evsel__name(pos));
650
651 if (!evsel->forced_leader)
652 ret += scnprintf(buf + ret, size - ret, " }");
653
654 return ret;
655}
656
657static void __perf_evsel__config_callchain(struct perf_evsel *evsel,
658 struct record_opts *opts,
659 struct callchain_param *param)
660{
661 bool function = perf_evsel__is_function_event(evsel);
662 struct perf_event_attr *attr = &evsel->attr;
663
664 perf_evsel__set_sample_bit(evsel, CALLCHAIN);
665
666 attr->sample_max_stack = param->max_stack;
667
668 if (param->record_mode == CALLCHAIN_LBR) {
669 if (!opts->branch_stack) {
670 if (attr->exclude_user) {
671 pr_warning("LBR callstack option is only available "
672 "to get user callchain information. "
673 "Falling back to framepointers.\n");
674 } else {
675 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
676 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
677 PERF_SAMPLE_BRANCH_CALL_STACK |
678 PERF_SAMPLE_BRANCH_NO_CYCLES |
679 PERF_SAMPLE_BRANCH_NO_FLAGS;
680 }
681 } else
682 pr_warning("Cannot use LBR callstack with branch stack. "
683 "Falling back to framepointers.\n");
684 }
685
686 if (param->record_mode == CALLCHAIN_DWARF) {
687 if (!function) {
688 perf_evsel__set_sample_bit(evsel, REGS_USER);
689 perf_evsel__set_sample_bit(evsel, STACK_USER);
690 attr->sample_regs_user |= PERF_REGS_MASK;
691 attr->sample_stack_user = param->dump_size;
692 attr->exclude_callchain_user = 1;
693 } else {
694 pr_info("Cannot use DWARF unwind for function trace event,"
695 " falling back to framepointers.\n");
696 }
697 }
698
699 if (function) {
700 pr_info("Disabling user space callchains for function trace event.\n");
701 attr->exclude_callchain_user = 1;
702 }
703}
704
705void perf_evsel__config_callchain(struct perf_evsel *evsel,
706 struct record_opts *opts,
707 struct callchain_param *param)
708{
709 if (param->enabled)
710 return __perf_evsel__config_callchain(evsel, opts, param);
711}
712
713static void
714perf_evsel__reset_callgraph(struct perf_evsel *evsel,
715 struct callchain_param *param)
716{
717 struct perf_event_attr *attr = &evsel->attr;
718
719 perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
720 if (param->record_mode == CALLCHAIN_LBR) {
721 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
722 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
723 PERF_SAMPLE_BRANCH_CALL_STACK);
724 }
725 if (param->record_mode == CALLCHAIN_DWARF) {
726 perf_evsel__reset_sample_bit(evsel, REGS_USER);
727 perf_evsel__reset_sample_bit(evsel, STACK_USER);
728 }
729}
730
731static void apply_config_terms(struct perf_evsel *evsel,
732 struct record_opts *opts, bool track)
733{
734 struct perf_evsel_config_term *term;
735 struct list_head *config_terms = &evsel->config_terms;
736 struct perf_event_attr *attr = &evsel->attr;
737 /* callgraph default */
738 struct callchain_param param = {
739 .record_mode = callchain_param.record_mode,
740 };
741 u32 dump_size = 0;
742 int max_stack = 0;
743 const char *callgraph_buf = NULL;
744
745 list_for_each_entry(term, config_terms, list) {
746 switch (term->type) {
747 case PERF_EVSEL__CONFIG_TERM_PERIOD:
748 if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
749 attr->sample_period = term->val.period;
750 attr->freq = 0;
751 perf_evsel__reset_sample_bit(evsel, PERIOD);
752 }
753 break;
754 case PERF_EVSEL__CONFIG_TERM_FREQ:
755 if (!(term->weak && opts->user_freq != UINT_MAX)) {
756 attr->sample_freq = term->val.freq;
757 attr->freq = 1;
758 perf_evsel__set_sample_bit(evsel, PERIOD);
759 }
760 break;
761 case PERF_EVSEL__CONFIG_TERM_TIME:
762 if (term->val.time)
763 perf_evsel__set_sample_bit(evsel, TIME);
764 else
765 perf_evsel__reset_sample_bit(evsel, TIME);
766 break;
767 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
768 callgraph_buf = term->val.callgraph;
769 break;
770 case PERF_EVSEL__CONFIG_TERM_BRANCH:
771 if (term->val.branch && strcmp(term->val.branch, "no")) {
772 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
773 parse_branch_str(term->val.branch,
774 &attr->branch_sample_type);
775 } else
776 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
777 break;
778 case PERF_EVSEL__CONFIG_TERM_STACK_USER:
779 dump_size = term->val.stack_user;
780 break;
781 case PERF_EVSEL__CONFIG_TERM_MAX_STACK:
782 max_stack = term->val.max_stack;
783 break;
784 case PERF_EVSEL__CONFIG_TERM_INHERIT:
785 /*
786 * attr->inherit should has already been set by
787 * perf_evsel__config. If user explicitly set
788 * inherit using config terms, override global
789 * opt->no_inherit setting.
790 */
791 attr->inherit = term->val.inherit ? 1 : 0;
792 break;
793 case PERF_EVSEL__CONFIG_TERM_OVERWRITE:
794 attr->write_backward = term->val.overwrite ? 1 : 0;
795 break;
796 case PERF_EVSEL__CONFIG_TERM_DRV_CFG:
797 break;
798 default:
799 break;
800 }
801 }
802
803 /* User explicitly set per-event callgraph, clear the old setting and reset. */
804 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
805 bool sample_address = false;
806
807 if (max_stack) {
808 param.max_stack = max_stack;
809 if (callgraph_buf == NULL)
810 callgraph_buf = "fp";
811 }
812
813 /* parse callgraph parameters */
814 if (callgraph_buf != NULL) {
815 if (!strcmp(callgraph_buf, "no")) {
816 param.enabled = false;
817 param.record_mode = CALLCHAIN_NONE;
818 } else {
819 param.enabled = true;
820 if (parse_callchain_record(callgraph_buf, ¶m)) {
821 pr_err("per-event callgraph setting for %s failed. "
822 "Apply callgraph global setting for it\n",
823 evsel->name);
824 return;
825 }
826 if (param.record_mode == CALLCHAIN_DWARF)
827 sample_address = true;
828 }
829 }
830 if (dump_size > 0) {
831 dump_size = round_up(dump_size, sizeof(u64));
832 param.dump_size = dump_size;
833 }
834
835 /* If global callgraph set, clear it */
836 if (callchain_param.enabled)
837 perf_evsel__reset_callgraph(evsel, &callchain_param);
838
839 /* set perf-event callgraph */
840 if (param.enabled) {
841 if (sample_address) {
842 perf_evsel__set_sample_bit(evsel, ADDR);
843 perf_evsel__set_sample_bit(evsel, DATA_SRC);
844 evsel->attr.mmap_data = track;
845 }
846 perf_evsel__config_callchain(evsel, opts, ¶m);
847 }
848 }
849}
850
851/*
852 * The enable_on_exec/disabled value strategy:
853 *
854 * 1) For any type of traced program:
855 * - all independent events and group leaders are disabled
856 * - all group members are enabled
857 *
858 * Group members are ruled by group leaders. They need to
859 * be enabled, because the group scheduling relies on that.
860 *
861 * 2) For traced programs executed by perf:
862 * - all independent events and group leaders have
863 * enable_on_exec set
864 * - we don't specifically enable or disable any event during
865 * the record command
866 *
867 * Independent events and group leaders are initially disabled
868 * and get enabled by exec. Group members are ruled by group
869 * leaders as stated in 1).
870 *
871 * 3) For traced programs attached by perf (pid/tid):
872 * - we specifically enable or disable all events during
873 * the record command
874 *
875 * When attaching events to already running traced we
876 * enable/disable events specifically, as there's no
877 * initial traced exec call.
878 */
879void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
880 struct callchain_param *callchain)
881{
882 struct perf_evsel *leader = evsel->leader;
883 struct perf_event_attr *attr = &evsel->attr;
884 int track = evsel->tracking;
885 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
886
887 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
888 attr->inherit = !opts->no_inherit;
889 attr->write_backward = opts->overwrite ? 1 : 0;
890
891 perf_evsel__set_sample_bit(evsel, IP);
892 perf_evsel__set_sample_bit(evsel, TID);
893
894 if (evsel->sample_read) {
895 perf_evsel__set_sample_bit(evsel, READ);
896
897 /*
898 * We need ID even in case of single event, because
899 * PERF_SAMPLE_READ process ID specific data.
900 */
901 perf_evsel__set_sample_id(evsel, false);
902
903 /*
904 * Apply group format only if we belong to group
905 * with more than one members.
906 */
907 if (leader->nr_members > 1) {
908 attr->read_format |= PERF_FORMAT_GROUP;
909 attr->inherit = 0;
910 }
911 }
912
913 /*
914 * We default some events to have a default interval. But keep
915 * it a weak assumption overridable by the user.
916 */
917 if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
918 opts->user_interval != ULLONG_MAX)) {
919 if (opts->freq) {
920 perf_evsel__set_sample_bit(evsel, PERIOD);
921 attr->freq = 1;
922 attr->sample_freq = opts->freq;
923 } else {
924 attr->sample_period = opts->default_interval;
925 }
926 }
927
928 /*
929 * Disable sampling for all group members other
930 * than leader in case leader 'leads' the sampling.
931 */
932 if ((leader != evsel) && leader->sample_read) {
933 attr->freq = 0;
934 attr->sample_freq = 0;
935 attr->sample_period = 0;
936 attr->write_backward = 0;
937 attr->sample_id_all = 0;
938 }
939
940 if (opts->no_samples)
941 attr->sample_freq = 0;
942
943 if (opts->inherit_stat) {
944 evsel->attr.read_format |=
945 PERF_FORMAT_TOTAL_TIME_ENABLED |
946 PERF_FORMAT_TOTAL_TIME_RUNNING |
947 PERF_FORMAT_ID;
948 attr->inherit_stat = 1;
949 }
950
951 if (opts->sample_address) {
952 perf_evsel__set_sample_bit(evsel, ADDR);
953 attr->mmap_data = track;
954 }
955
956 /*
957 * We don't allow user space callchains for function trace
958 * event, due to issues with page faults while tracing page
959 * fault handler and its overall trickiness nature.
960 */
961 if (perf_evsel__is_function_event(evsel))
962 evsel->attr.exclude_callchain_user = 1;
963
964 if (callchain && callchain->enabled && !evsel->no_aux_samples)
965 perf_evsel__config_callchain(evsel, opts, callchain);
966
967 if (opts->sample_intr_regs) {
968 attr->sample_regs_intr = opts->sample_intr_regs;
969 perf_evsel__set_sample_bit(evsel, REGS_INTR);
970 }
971
972 if (opts->sample_user_regs) {
973 attr->sample_regs_user |= opts->sample_user_regs;
974 perf_evsel__set_sample_bit(evsel, REGS_USER);
975 }
976
977 if (target__has_cpu(&opts->target) || opts->sample_cpu)
978 perf_evsel__set_sample_bit(evsel, CPU);
979
980 /*
981 * When the user explicitly disabled time don't force it here.
982 */
983 if (opts->sample_time &&
984 (!perf_missing_features.sample_id_all &&
985 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
986 opts->sample_time_set)))
987 perf_evsel__set_sample_bit(evsel, TIME);
988
989 if (opts->raw_samples && !evsel->no_aux_samples) {
990 perf_evsel__set_sample_bit(evsel, TIME);
991 perf_evsel__set_sample_bit(evsel, RAW);
992 perf_evsel__set_sample_bit(evsel, CPU);
993 }
994
995 if (opts->sample_address)
996 perf_evsel__set_sample_bit(evsel, DATA_SRC);
997
998 if (opts->sample_phys_addr)
999 perf_evsel__set_sample_bit(evsel, PHYS_ADDR);
1000
1001 if (opts->no_buffering) {
1002 attr->watermark = 0;
1003 attr->wakeup_events = 1;
1004 }
1005 if (opts->branch_stack && !evsel->no_aux_samples) {
1006 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
1007 attr->branch_sample_type = opts->branch_stack;
1008 }
1009
1010 if (opts->sample_weight)
1011 perf_evsel__set_sample_bit(evsel, WEIGHT);
1012
1013 attr->task = track;
1014 attr->mmap = track;
1015 attr->mmap2 = track && !perf_missing_features.mmap2;
1016 attr->comm = track;
1017
1018 if (opts->record_namespaces)
1019 attr->namespaces = track;
1020
1021 if (opts->record_switch_events)
1022 attr->context_switch = track;
1023
1024 if (opts->sample_transaction)
1025 perf_evsel__set_sample_bit(evsel, TRANSACTION);
1026
1027 if (opts->running_time) {
1028 evsel->attr.read_format |=
1029 PERF_FORMAT_TOTAL_TIME_ENABLED |
1030 PERF_FORMAT_TOTAL_TIME_RUNNING;
1031 }
1032
1033 /*
1034 * XXX see the function comment above
1035 *
1036 * Disabling only independent events or group leaders,
1037 * keeping group members enabled.
1038 */
1039 if (perf_evsel__is_group_leader(evsel))
1040 attr->disabled = 1;
1041
1042 /*
1043 * Setting enable_on_exec for independent events and
1044 * group leaders for traced executed by perf.
1045 */
1046 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
1047 !opts->initial_delay)
1048 attr->enable_on_exec = 1;
1049
1050 if (evsel->immediate) {
1051 attr->disabled = 0;
1052 attr->enable_on_exec = 0;
1053 }
1054
1055 clockid = opts->clockid;
1056 if (opts->use_clockid) {
1057 attr->use_clockid = 1;
1058 attr->clockid = opts->clockid;
1059 }
1060
1061 if (evsel->precise_max)
1062 perf_event_attr__set_max_precise_ip(attr);
1063
1064 if (opts->all_user) {
1065 attr->exclude_kernel = 1;
1066 attr->exclude_user = 0;
1067 }
1068
1069 if (opts->all_kernel) {
1070 attr->exclude_kernel = 0;
1071 attr->exclude_user = 1;
1072 }
1073
1074 /*
1075 * Apply event specific term settings,
1076 * it overloads any global configuration.
1077 */
1078 apply_config_terms(evsel, opts, track);
1079
1080 evsel->ignore_missing_thread = opts->ignore_missing_thread;
1081
1082 /* The --period option takes the precedence. */
1083 if (opts->period_set) {
1084 if (opts->period)
1085 perf_evsel__set_sample_bit(evsel, PERIOD);
1086 else
1087 perf_evsel__reset_sample_bit(evsel, PERIOD);
1088 }
1089}
1090
1091static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
1092{
1093 if (evsel->system_wide)
1094 nthreads = 1;
1095
1096 evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
1097
1098 if (evsel->fd) {
1099 int cpu, thread;
1100 for (cpu = 0; cpu < ncpus; cpu++) {
1101 for (thread = 0; thread < nthreads; thread++) {
1102 FD(evsel, cpu, thread) = -1;
1103 }
1104 }
1105 }
1106
1107 return evsel->fd != NULL ? 0 : -ENOMEM;
1108}
1109
1110static int perf_evsel__run_ioctl(struct perf_evsel *evsel,
1111 int ioc, void *arg)
1112{
1113 int cpu, thread;
1114
1115 for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++) {
1116 for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
1117 int fd = FD(evsel, cpu, thread),
1118 err = ioctl(fd, ioc, arg);
1119
1120 if (err)
1121 return err;
1122 }
1123 }
1124
1125 return 0;
1126}
1127
1128int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter)
1129{
1130 return perf_evsel__run_ioctl(evsel,
1131 PERF_EVENT_IOC_SET_FILTER,
1132 (void *)filter);
1133}
1134
1135int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
1136{
1137 char *new_filter = strdup(filter);
1138
1139 if (new_filter != NULL) {
1140 free(evsel->filter);
1141 evsel->filter = new_filter;
1142 return 0;
1143 }
1144
1145 return -1;
1146}
1147
1148static int perf_evsel__append_filter(struct perf_evsel *evsel,
1149 const char *fmt, const char *filter)
1150{
1151 char *new_filter;
1152
1153 if (evsel->filter == NULL)
1154 return perf_evsel__set_filter(evsel, filter);
1155
1156 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1157 free(evsel->filter);
1158 evsel->filter = new_filter;
1159 return 0;
1160 }
1161
1162 return -1;
1163}
1164
1165int perf_evsel__append_tp_filter(struct perf_evsel *evsel, const char *filter)
1166{
1167 return perf_evsel__append_filter(evsel, "(%s) && (%s)", filter);
1168}
1169
1170int perf_evsel__append_addr_filter(struct perf_evsel *evsel, const char *filter)
1171{
1172 return perf_evsel__append_filter(evsel, "%s,%s", filter);
1173}
1174
1175int perf_evsel__enable(struct perf_evsel *evsel)
1176{
1177 return perf_evsel__run_ioctl(evsel,
1178 PERF_EVENT_IOC_ENABLE,
1179 0);
1180}
1181
1182int perf_evsel__disable(struct perf_evsel *evsel)
1183{
1184 return perf_evsel__run_ioctl(evsel,
1185 PERF_EVENT_IOC_DISABLE,
1186 0);
1187}
1188
1189int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
1190{
1191 if (ncpus == 0 || nthreads == 0)
1192 return 0;
1193
1194 if (evsel->system_wide)
1195 nthreads = 1;
1196
1197 evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
1198 if (evsel->sample_id == NULL)
1199 return -ENOMEM;
1200
1201 evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
1202 if (evsel->id == NULL) {
1203 xyarray__delete(evsel->sample_id);
1204 evsel->sample_id = NULL;
1205 return -ENOMEM;
1206 }
1207
1208 return 0;
1209}
1210
1211static void perf_evsel__free_fd(struct perf_evsel *evsel)
1212{
1213 xyarray__delete(evsel->fd);
1214 evsel->fd = NULL;
1215}
1216
1217static void perf_evsel__free_id(struct perf_evsel *evsel)
1218{
1219 xyarray__delete(evsel->sample_id);
1220 evsel->sample_id = NULL;
1221 zfree(&evsel->id);
1222}
1223
1224static void perf_evsel__free_config_terms(struct perf_evsel *evsel)
1225{
1226 struct perf_evsel_config_term *term, *h;
1227
1228 list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1229 list_del(&term->list);
1230 free(term);
1231 }
1232}
1233
1234void perf_evsel__close_fd(struct perf_evsel *evsel)
1235{
1236 int cpu, thread;
1237
1238 for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++)
1239 for (thread = 0; thread < xyarray__max_y(evsel->fd); ++thread) {
1240 close(FD(evsel, cpu, thread));
1241 FD(evsel, cpu, thread) = -1;
1242 }
1243}
1244
1245void perf_evsel__exit(struct perf_evsel *evsel)
1246{
1247 assert(list_empty(&evsel->node));
1248 assert(evsel->evlist == NULL);
1249 perf_evsel__free_fd(evsel);
1250 perf_evsel__free_id(evsel);
1251 perf_evsel__free_config_terms(evsel);
1252 cgroup__put(evsel->cgrp);
1253 cpu_map__put(evsel->cpus);
1254 cpu_map__put(evsel->own_cpus);
1255 thread_map__put(evsel->threads);
1256 zfree(&evsel->group_name);
1257 zfree(&evsel->name);
1258 perf_evsel__object.fini(evsel);
1259}
1260
1261void perf_evsel__delete(struct perf_evsel *evsel)
1262{
1263 perf_evsel__exit(evsel);
1264 free(evsel);
1265}
1266
1267void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu, int thread,
1268 struct perf_counts_values *count)
1269{
1270 struct perf_counts_values tmp;
1271
1272 if (!evsel->prev_raw_counts)
1273 return;
1274
1275 if (cpu == -1) {
1276 tmp = evsel->prev_raw_counts->aggr;
1277 evsel->prev_raw_counts->aggr = *count;
1278 } else {
1279 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1280 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1281 }
1282
1283 count->val = count->val - tmp.val;
1284 count->ena = count->ena - tmp.ena;
1285 count->run = count->run - tmp.run;
1286}
1287
1288void perf_counts_values__scale(struct perf_counts_values *count,
1289 bool scale, s8 *pscaled)
1290{
1291 s8 scaled = 0;
1292
1293 if (scale) {
1294 if (count->run == 0) {
1295 scaled = -1;
1296 count->val = 0;
1297 } else if (count->run < count->ena) {
1298 scaled = 1;
1299 count->val = (u64)((double) count->val * count->ena / count->run + 0.5);
1300 }
1301 } else
1302 count->ena = count->run = 0;
1303
1304 if (pscaled)
1305 *pscaled = scaled;
1306}
1307
1308static int perf_evsel__read_size(struct perf_evsel *evsel)
1309{
1310 u64 read_format = evsel->attr.read_format;
1311 int entry = sizeof(u64); /* value */
1312 int size = 0;
1313 int nr = 1;
1314
1315 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1316 size += sizeof(u64);
1317
1318 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1319 size += sizeof(u64);
1320
1321 if (read_format & PERF_FORMAT_ID)
1322 entry += sizeof(u64);
1323
1324 if (read_format & PERF_FORMAT_GROUP) {
1325 nr = evsel->nr_members;
1326 size += sizeof(u64);
1327 }
1328
1329 size += entry * nr;
1330 return size;
1331}
1332
1333int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
1334 struct perf_counts_values *count)
1335{
1336 size_t size = perf_evsel__read_size(evsel);
1337
1338 memset(count, 0, sizeof(*count));
1339
1340 if (FD(evsel, cpu, thread) < 0)
1341 return -EINVAL;
1342
1343 if (readn(FD(evsel, cpu, thread), count->values, size) <= 0)
1344 return -errno;
1345
1346 return 0;
1347}
1348
1349static int
1350perf_evsel__read_one(struct perf_evsel *evsel, int cpu, int thread)
1351{
1352 struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread);
1353
1354 return perf_evsel__read(evsel, cpu, thread, count);
1355}
1356
1357static void
1358perf_evsel__set_count(struct perf_evsel *counter, int cpu, int thread,
1359 u64 val, u64 ena, u64 run)
1360{
1361 struct perf_counts_values *count;
1362
1363 count = perf_counts(counter->counts, cpu, thread);
1364
1365 count->val = val;
1366 count->ena = ena;
1367 count->run = run;
1368 count->loaded = true;
1369}
1370
1371static int
1372perf_evsel__process_group_data(struct perf_evsel *leader,
1373 int cpu, int thread, u64 *data)
1374{
1375 u64 read_format = leader->attr.read_format;
1376 struct sample_read_value *v;
1377 u64 nr, ena = 0, run = 0, i;
1378
1379 nr = *data++;
1380
1381 if (nr != (u64) leader->nr_members)
1382 return -EINVAL;
1383
1384 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1385 ena = *data++;
1386
1387 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1388 run = *data++;
1389
1390 v = (struct sample_read_value *) data;
1391
1392 perf_evsel__set_count(leader, cpu, thread,
1393 v[0].value, ena, run);
1394
1395 for (i = 1; i < nr; i++) {
1396 struct perf_evsel *counter;
1397
1398 counter = perf_evlist__id2evsel(leader->evlist, v[i].id);
1399 if (!counter)
1400 return -EINVAL;
1401
1402 perf_evsel__set_count(counter, cpu, thread,
1403 v[i].value, ena, run);
1404 }
1405
1406 return 0;
1407}
1408
1409static int
1410perf_evsel__read_group(struct perf_evsel *leader, int cpu, int thread)
1411{
1412 struct perf_stat_evsel *ps = leader->stats;
1413 u64 read_format = leader->attr.read_format;
1414 int size = perf_evsel__read_size(leader);
1415 u64 *data = ps->group_data;
1416
1417 if (!(read_format & PERF_FORMAT_ID))
1418 return -EINVAL;
1419
1420 if (!perf_evsel__is_group_leader(leader))
1421 return -EINVAL;
1422
1423 if (!data) {
1424 data = zalloc(size);
1425 if (!data)
1426 return -ENOMEM;
1427
1428 ps->group_data = data;
1429 }
1430
1431 if (FD(leader, cpu, thread) < 0)
1432 return -EINVAL;
1433
1434 if (readn(FD(leader, cpu, thread), data, size) <= 0)
1435 return -errno;
1436
1437 return perf_evsel__process_group_data(leader, cpu, thread, data);
1438}
1439
1440int perf_evsel__read_counter(struct perf_evsel *evsel, int cpu, int thread)
1441{
1442 u64 read_format = evsel->attr.read_format;
1443
1444 if (read_format & PERF_FORMAT_GROUP)
1445 return perf_evsel__read_group(evsel, cpu, thread);
1446 else
1447 return perf_evsel__read_one(evsel, cpu, thread);
1448}
1449
1450int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
1451 int cpu, int thread, bool scale)
1452{
1453 struct perf_counts_values count;
1454 size_t nv = scale ? 3 : 1;
1455
1456 if (FD(evsel, cpu, thread) < 0)
1457 return -EINVAL;
1458
1459 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1460 return -ENOMEM;
1461
1462 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0)
1463 return -errno;
1464
1465 perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1466 perf_counts_values__scale(&count, scale, NULL);
1467 *perf_counts(evsel->counts, cpu, thread) = count;
1468 return 0;
1469}
1470
1471static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
1472{
1473 struct perf_evsel *leader = evsel->leader;
1474 int fd;
1475
1476 if (perf_evsel__is_group_leader(evsel))
1477 return -1;
1478
1479 /*
1480 * Leader must be already processed/open,
1481 * if not it's a bug.
1482 */
1483 BUG_ON(!leader->fd);
1484
1485 fd = FD(leader, cpu, thread);
1486 BUG_ON(fd == -1);
1487
1488 return fd;
1489}
1490
1491struct bit_names {
1492 int bit;
1493 const char *name;
1494};
1495
1496static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits)
1497{
1498 bool first_bit = true;
1499 int i = 0;
1500
1501 do {
1502 if (value & bits[i].bit) {
1503 buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name);
1504 first_bit = false;
1505 }
1506 } while (bits[++i].name != NULL);
1507}
1508
1509static void __p_sample_type(char *buf, size_t size, u64 value)
1510{
1511#define bit_name(n) { PERF_SAMPLE_##n, #n }
1512 struct bit_names bits[] = {
1513 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
1514 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
1515 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
1516 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
1517 bit_name(IDENTIFIER), bit_name(REGS_INTR), bit_name(DATA_SRC),
1518 bit_name(WEIGHT), bit_name(PHYS_ADDR),
1519 { .name = NULL, }
1520 };
1521#undef bit_name
1522 __p_bits(buf, size, value, bits);
1523}
1524
1525static void __p_branch_sample_type(char *buf, size_t size, u64 value)
1526{
1527#define bit_name(n) { PERF_SAMPLE_BRANCH_##n, #n }
1528 struct bit_names bits[] = {
1529 bit_name(USER), bit_name(KERNEL), bit_name(HV), bit_name(ANY),
1530 bit_name(ANY_CALL), bit_name(ANY_RETURN), bit_name(IND_CALL),
1531 bit_name(ABORT_TX), bit_name(IN_TX), bit_name(NO_TX),
1532 bit_name(COND), bit_name(CALL_STACK), bit_name(IND_JUMP),
1533 bit_name(CALL), bit_name(NO_FLAGS), bit_name(NO_CYCLES),
1534 { .name = NULL, }
1535 };
1536#undef bit_name
1537 __p_bits(buf, size, value, bits);
1538}
1539
1540static void __p_read_format(char *buf, size_t size, u64 value)
1541{
1542#define bit_name(n) { PERF_FORMAT_##n, #n }
1543 struct bit_names bits[] = {
1544 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
1545 bit_name(ID), bit_name(GROUP),
1546 { .name = NULL, }
1547 };
1548#undef bit_name
1549 __p_bits(buf, size, value, bits);
1550}
1551
1552#define BUF_SIZE 1024
1553
1554#define p_hex(val) snprintf(buf, BUF_SIZE, "%#"PRIx64, (uint64_t)(val))
1555#define p_unsigned(val) snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val))
1556#define p_signed(val) snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val))
1557#define p_sample_type(val) __p_sample_type(buf, BUF_SIZE, val)
1558#define p_branch_sample_type(val) __p_branch_sample_type(buf, BUF_SIZE, val)
1559#define p_read_format(val) __p_read_format(buf, BUF_SIZE, val)
1560
1561#define PRINT_ATTRn(_n, _f, _p) \
1562do { \
1563 if (attr->_f) { \
1564 _p(attr->_f); \
1565 ret += attr__fprintf(fp, _n, buf, priv);\
1566 } \
1567} while (0)
1568
1569#define PRINT_ATTRf(_f, _p) PRINT_ATTRn(#_f, _f, _p)
1570
1571int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
1572 attr__fprintf_f attr__fprintf, void *priv)
1573{
1574 char buf[BUF_SIZE];
1575 int ret = 0;
1576
1577 PRINT_ATTRf(type, p_unsigned);
1578 PRINT_ATTRf(size, p_unsigned);
1579 PRINT_ATTRf(config, p_hex);
1580 PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned);
1581 PRINT_ATTRf(sample_type, p_sample_type);
1582 PRINT_ATTRf(read_format, p_read_format);
1583
1584 PRINT_ATTRf(disabled, p_unsigned);
1585 PRINT_ATTRf(inherit, p_unsigned);
1586 PRINT_ATTRf(pinned, p_unsigned);
1587 PRINT_ATTRf(exclusive, p_unsigned);
1588 PRINT_ATTRf(exclude_user, p_unsigned);
1589 PRINT_ATTRf(exclude_kernel, p_unsigned);
1590 PRINT_ATTRf(exclude_hv, p_unsigned);
1591 PRINT_ATTRf(exclude_idle, p_unsigned);
1592 PRINT_ATTRf(mmap, p_unsigned);
1593 PRINT_ATTRf(comm, p_unsigned);
1594 PRINT_ATTRf(freq, p_unsigned);
1595 PRINT_ATTRf(inherit_stat, p_unsigned);
1596 PRINT_ATTRf(enable_on_exec, p_unsigned);
1597 PRINT_ATTRf(task, p_unsigned);
1598 PRINT_ATTRf(watermark, p_unsigned);
1599 PRINT_ATTRf(precise_ip, p_unsigned);
1600 PRINT_ATTRf(mmap_data, p_unsigned);
1601 PRINT_ATTRf(sample_id_all, p_unsigned);
1602 PRINT_ATTRf(exclude_host, p_unsigned);
1603 PRINT_ATTRf(exclude_guest, p_unsigned);
1604 PRINT_ATTRf(exclude_callchain_kernel, p_unsigned);
1605 PRINT_ATTRf(exclude_callchain_user, p_unsigned);
1606 PRINT_ATTRf(mmap2, p_unsigned);
1607 PRINT_ATTRf(comm_exec, p_unsigned);
1608 PRINT_ATTRf(use_clockid, p_unsigned);
1609 PRINT_ATTRf(context_switch, p_unsigned);
1610 PRINT_ATTRf(write_backward, p_unsigned);
1611 PRINT_ATTRf(namespaces, p_unsigned);
1612
1613 PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
1614 PRINT_ATTRf(bp_type, p_unsigned);
1615 PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex);
1616 PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex);
1617 PRINT_ATTRf(branch_sample_type, p_branch_sample_type);
1618 PRINT_ATTRf(sample_regs_user, p_hex);
1619 PRINT_ATTRf(sample_stack_user, p_unsigned);
1620 PRINT_ATTRf(clockid, p_signed);
1621 PRINT_ATTRf(sample_regs_intr, p_hex);
1622 PRINT_ATTRf(aux_watermark, p_unsigned);
1623 PRINT_ATTRf(sample_max_stack, p_unsigned);
1624
1625 return ret;
1626}
1627
1628static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1629 void *priv __maybe_unused)
1630{
1631 return fprintf(fp, " %-32s %s\n", name, val);
1632}
1633
1634static void perf_evsel__remove_fd(struct perf_evsel *pos,
1635 int nr_cpus, int nr_threads,
1636 int thread_idx)
1637{
1638 for (int cpu = 0; cpu < nr_cpus; cpu++)
1639 for (int thread = thread_idx; thread < nr_threads - 1; thread++)
1640 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
1641}
1642
1643static int update_fds(struct perf_evsel *evsel,
1644 int nr_cpus, int cpu_idx,
1645 int nr_threads, int thread_idx)
1646{
1647 struct perf_evsel *pos;
1648
1649 if (cpu_idx >= nr_cpus || thread_idx >= nr_threads)
1650 return -EINVAL;
1651
1652 evlist__for_each_entry(evsel->evlist, pos) {
1653 nr_cpus = pos != evsel ? nr_cpus : cpu_idx;
1654
1655 perf_evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
1656
1657 /*
1658 * Since fds for next evsel has not been created,
1659 * there is no need to iterate whole event list.
1660 */
1661 if (pos == evsel)
1662 break;
1663 }
1664 return 0;
1665}
1666
1667static bool ignore_missing_thread(struct perf_evsel *evsel,
1668 int nr_cpus, int cpu,
1669 struct thread_map *threads,
1670 int thread, int err)
1671{
1672 pid_t ignore_pid = thread_map__pid(threads, thread);
1673
1674 if (!evsel->ignore_missing_thread)
1675 return false;
1676
1677 /* The system wide setup does not work with threads. */
1678 if (evsel->system_wide)
1679 return false;
1680
1681 /* The -ESRCH is perf event syscall errno for pid's not found. */
1682 if (err != -ESRCH)
1683 return false;
1684
1685 /* If there's only one thread, let it fail. */
1686 if (threads->nr == 1)
1687 return false;
1688
1689 /*
1690 * We should remove fd for missing_thread first
1691 * because thread_map__remove() will decrease threads->nr.
1692 */
1693 if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread))
1694 return false;
1695
1696 if (thread_map__remove(threads, thread))
1697 return false;
1698
1699 pr_warning("WARNING: Ignored open failure for pid %d\n",
1700 ignore_pid);
1701 return true;
1702}
1703
1704int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1705 struct thread_map *threads)
1706{
1707 int cpu, thread, nthreads;
1708 unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1709 int pid = -1, err;
1710 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1711
1712 if (perf_missing_features.write_backward && evsel->attr.write_backward)
1713 return -EINVAL;
1714
1715 if (cpus == NULL) {
1716 static struct cpu_map *empty_cpu_map;
1717
1718 if (empty_cpu_map == NULL) {
1719 empty_cpu_map = cpu_map__dummy_new();
1720 if (empty_cpu_map == NULL)
1721 return -ENOMEM;
1722 }
1723
1724 cpus = empty_cpu_map;
1725 }
1726
1727 if (threads == NULL) {
1728 static struct thread_map *empty_thread_map;
1729
1730 if (empty_thread_map == NULL) {
1731 empty_thread_map = thread_map__new_by_tid(-1);
1732 if (empty_thread_map == NULL)
1733 return -ENOMEM;
1734 }
1735
1736 threads = empty_thread_map;
1737 }
1738
1739 if (evsel->system_wide)
1740 nthreads = 1;
1741 else
1742 nthreads = threads->nr;
1743
1744 if (evsel->fd == NULL &&
1745 perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0)
1746 return -ENOMEM;
1747
1748 if (evsel->cgrp) {
1749 flags |= PERF_FLAG_PID_CGROUP;
1750 pid = evsel->cgrp->fd;
1751 }
1752
1753fallback_missing_features:
1754 if (perf_missing_features.clockid_wrong)
1755 evsel->attr.clockid = CLOCK_MONOTONIC; /* should always work */
1756 if (perf_missing_features.clockid) {
1757 evsel->attr.use_clockid = 0;
1758 evsel->attr.clockid = 0;
1759 }
1760 if (perf_missing_features.cloexec)
1761 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1762 if (perf_missing_features.mmap2)
1763 evsel->attr.mmap2 = 0;
1764 if (perf_missing_features.exclude_guest)
1765 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
1766 if (perf_missing_features.lbr_flags)
1767 evsel->attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1768 PERF_SAMPLE_BRANCH_NO_CYCLES);
1769 if (perf_missing_features.group_read && evsel->attr.inherit)
1770 evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
1771retry_sample_id:
1772 if (perf_missing_features.sample_id_all)
1773 evsel->attr.sample_id_all = 0;
1774
1775 if (verbose >= 2) {
1776 fprintf(stderr, "%.60s\n", graph_dotted_line);
1777 fprintf(stderr, "perf_event_attr:\n");
1778 perf_event_attr__fprintf(stderr, &evsel->attr, __open_attr__fprintf, NULL);
1779 fprintf(stderr, "%.60s\n", graph_dotted_line);
1780 }
1781
1782 for (cpu = 0; cpu < cpus->nr; cpu++) {
1783
1784 for (thread = 0; thread < nthreads; thread++) {
1785 int fd, group_fd;
1786
1787 if (!evsel->cgrp && !evsel->system_wide)
1788 pid = thread_map__pid(threads, thread);
1789
1790 group_fd = get_group_fd(evsel, cpu, thread);
1791retry_open:
1792 pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx",
1793 pid, cpus->map[cpu], group_fd, flags);
1794
1795 test_attr__ready();
1796
1797 fd = sys_perf_event_open(&evsel->attr, pid, cpus->map[cpu],
1798 group_fd, flags);
1799
1800 FD(evsel, cpu, thread) = fd;
1801
1802 if (fd < 0) {
1803 err = -errno;
1804
1805 if (ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) {
1806 /*
1807 * We just removed 1 thread, so take a step
1808 * back on thread index and lower the upper
1809 * nthreads limit.
1810 */
1811 nthreads--;
1812 thread--;
1813
1814 /* ... and pretend like nothing have happened. */
1815 err = 0;
1816 continue;
1817 }
1818
1819 pr_debug2("\nsys_perf_event_open failed, error %d\n",
1820 err);
1821 goto try_fallback;
1822 }
1823
1824 pr_debug2(" = %d\n", fd);
1825
1826 if (evsel->bpf_fd >= 0) {
1827 int evt_fd = fd;
1828 int bpf_fd = evsel->bpf_fd;
1829
1830 err = ioctl(evt_fd,
1831 PERF_EVENT_IOC_SET_BPF,
1832 bpf_fd);
1833 if (err && errno != EEXIST) {
1834 pr_err("failed to attach bpf fd %d: %s\n",
1835 bpf_fd, strerror(errno));
1836 err = -EINVAL;
1837 goto out_close;
1838 }
1839 }
1840
1841 set_rlimit = NO_CHANGE;
1842
1843 /*
1844 * If we succeeded but had to kill clockid, fail and
1845 * have perf_evsel__open_strerror() print us a nice
1846 * error.
1847 */
1848 if (perf_missing_features.clockid ||
1849 perf_missing_features.clockid_wrong) {
1850 err = -EINVAL;
1851 goto out_close;
1852 }
1853 }
1854 }
1855
1856 return 0;
1857
1858try_fallback:
1859 /*
1860 * perf stat needs between 5 and 22 fds per CPU. When we run out
1861 * of them try to increase the limits.
1862 */
1863 if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1864 struct rlimit l;
1865 int old_errno = errno;
1866
1867 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1868 if (set_rlimit == NO_CHANGE)
1869 l.rlim_cur = l.rlim_max;
1870 else {
1871 l.rlim_cur = l.rlim_max + 1000;
1872 l.rlim_max = l.rlim_cur;
1873 }
1874 if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1875 set_rlimit++;
1876 errno = old_errno;
1877 goto retry_open;
1878 }
1879 }
1880 errno = old_errno;
1881 }
1882
1883 if (err != -EINVAL || cpu > 0 || thread > 0)
1884 goto out_close;
1885
1886 /*
1887 * Must probe features in the order they were added to the
1888 * perf_event_attr interface.
1889 */
1890 if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
1891 perf_missing_features.write_backward = true;
1892 pr_debug2("switching off write_backward\n");
1893 goto out_close;
1894 } else if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) {
1895 perf_missing_features.clockid_wrong = true;
1896 pr_debug2("switching off clockid\n");
1897 goto fallback_missing_features;
1898 } else if (!perf_missing_features.clockid && evsel->attr.use_clockid) {
1899 perf_missing_features.clockid = true;
1900 pr_debug2("switching off use_clockid\n");
1901 goto fallback_missing_features;
1902 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1903 perf_missing_features.cloexec = true;
1904 pr_debug2("switching off cloexec flag\n");
1905 goto fallback_missing_features;
1906 } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
1907 perf_missing_features.mmap2 = true;
1908 pr_debug2("switching off mmap2\n");
1909 goto fallback_missing_features;
1910 } else if (!perf_missing_features.exclude_guest &&
1911 (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
1912 perf_missing_features.exclude_guest = true;
1913 pr_debug2("switching off exclude_guest, exclude_host\n");
1914 goto fallback_missing_features;
1915 } else if (!perf_missing_features.sample_id_all) {
1916 perf_missing_features.sample_id_all = true;
1917 pr_debug2("switching off sample_id_all\n");
1918 goto retry_sample_id;
1919 } else if (!perf_missing_features.lbr_flags &&
1920 (evsel->attr.branch_sample_type &
1921 (PERF_SAMPLE_BRANCH_NO_CYCLES |
1922 PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1923 perf_missing_features.lbr_flags = true;
1924 pr_debug2("switching off branch sample type no (cycles/flags)\n");
1925 goto fallback_missing_features;
1926 } else if (!perf_missing_features.group_read &&
1927 evsel->attr.inherit &&
1928 (evsel->attr.read_format & PERF_FORMAT_GROUP) &&
1929 perf_evsel__is_group_leader(evsel)) {
1930 perf_missing_features.group_read = true;
1931 pr_debug2("switching off group read\n");
1932 goto fallback_missing_features;
1933 }
1934out_close:
1935 if (err)
1936 threads->err_thread = thread;
1937
1938 do {
1939 while (--thread >= 0) {
1940 close(FD(evsel, cpu, thread));
1941 FD(evsel, cpu, thread) = -1;
1942 }
1943 thread = nthreads;
1944 } while (--cpu >= 0);
1945 return err;
1946}
1947
1948void perf_evsel__close(struct perf_evsel *evsel)
1949{
1950 if (evsel->fd == NULL)
1951 return;
1952
1953 perf_evsel__close_fd(evsel);
1954 perf_evsel__free_fd(evsel);
1955}
1956
1957int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
1958 struct cpu_map *cpus)
1959{
1960 return perf_evsel__open(evsel, cpus, NULL);
1961}
1962
1963int perf_evsel__open_per_thread(struct perf_evsel *evsel,
1964 struct thread_map *threads)
1965{
1966 return perf_evsel__open(evsel, NULL, threads);
1967}
1968
1969static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
1970 const union perf_event *event,
1971 struct perf_sample *sample)
1972{
1973 u64 type = evsel->attr.sample_type;
1974 const u64 *array = event->sample.array;
1975 bool swapped = evsel->needs_swap;
1976 union u64_swap u;
1977
1978 array += ((event->header.size -
1979 sizeof(event->header)) / sizeof(u64)) - 1;
1980
1981 if (type & PERF_SAMPLE_IDENTIFIER) {
1982 sample->id = *array;
1983 array--;
1984 }
1985
1986 if (type & PERF_SAMPLE_CPU) {
1987 u.val64 = *array;
1988 if (swapped) {
1989 /* undo swap of u64, then swap on individual u32s */
1990 u.val64 = bswap_64(u.val64);
1991 u.val32[0] = bswap_32(u.val32[0]);
1992 }
1993
1994 sample->cpu = u.val32[0];
1995 array--;
1996 }
1997
1998 if (type & PERF_SAMPLE_STREAM_ID) {
1999 sample->stream_id = *array;
2000 array--;
2001 }
2002
2003 if (type & PERF_SAMPLE_ID) {
2004 sample->id = *array;
2005 array--;
2006 }
2007
2008 if (type & PERF_SAMPLE_TIME) {
2009 sample->time = *array;
2010 array--;
2011 }
2012
2013 if (type & PERF_SAMPLE_TID) {
2014 u.val64 = *array;
2015 if (swapped) {
2016 /* undo swap of u64, then swap on individual u32s */
2017 u.val64 = bswap_64(u.val64);
2018 u.val32[0] = bswap_32(u.val32[0]);
2019 u.val32[1] = bswap_32(u.val32[1]);
2020 }
2021
2022 sample->pid = u.val32[0];
2023 sample->tid = u.val32[1];
2024 array--;
2025 }
2026
2027 return 0;
2028}
2029
2030static inline bool overflow(const void *endp, u16 max_size, const void *offset,
2031 u64 size)
2032{
2033 return size > max_size || offset + size > endp;
2034}
2035
2036#define OVERFLOW_CHECK(offset, size, max_size) \
2037 do { \
2038 if (overflow(endp, (max_size), (offset), (size))) \
2039 return -EFAULT; \
2040 } while (0)
2041
2042#define OVERFLOW_CHECK_u64(offset) \
2043 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
2044
2045static int
2046perf_event__check_size(union perf_event *event, unsigned int sample_size)
2047{
2048 /*
2049 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
2050 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
2051 * check the format does not go past the end of the event.
2052 */
2053 if (sample_size + sizeof(event->header) > event->header.size)
2054 return -EFAULT;
2055
2056 return 0;
2057}
2058
2059int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
2060 struct perf_sample *data)
2061{
2062 u64 type = evsel->attr.sample_type;
2063 bool swapped = evsel->needs_swap;
2064 const u64 *array;
2065 u16 max_size = event->header.size;
2066 const void *endp = (void *)event + max_size;
2067 u64 sz;
2068
2069 /*
2070 * used for cross-endian analysis. See git commit 65014ab3
2071 * for why this goofiness is needed.
2072 */
2073 union u64_swap u;
2074
2075 memset(data, 0, sizeof(*data));
2076 data->cpu = data->pid = data->tid = -1;
2077 data->stream_id = data->id = data->time = -1ULL;
2078 data->period = evsel->attr.sample_period;
2079 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
2080 data->misc = event->header.misc;
2081 data->id = -1ULL;
2082 data->data_src = PERF_MEM_DATA_SRC_NONE;
2083
2084 if (event->header.type != PERF_RECORD_SAMPLE) {
2085 if (!evsel->attr.sample_id_all)
2086 return 0;
2087 return perf_evsel__parse_id_sample(evsel, event, data);
2088 }
2089
2090 array = event->sample.array;
2091
2092 if (perf_event__check_size(event, evsel->sample_size))
2093 return -EFAULT;
2094
2095 if (type & PERF_SAMPLE_IDENTIFIER) {
2096 data->id = *array;
2097 array++;
2098 }
2099
2100 if (type & PERF_SAMPLE_IP) {
2101 data->ip = *array;
2102 array++;
2103 }
2104
2105 if (type & PERF_SAMPLE_TID) {
2106 u.val64 = *array;
2107 if (swapped) {
2108 /* undo swap of u64, then swap on individual u32s */
2109 u.val64 = bswap_64(u.val64);
2110 u.val32[0] = bswap_32(u.val32[0]);
2111 u.val32[1] = bswap_32(u.val32[1]);
2112 }
2113
2114 data->pid = u.val32[0];
2115 data->tid = u.val32[1];
2116 array++;
2117 }
2118
2119 if (type & PERF_SAMPLE_TIME) {
2120 data->time = *array;
2121 array++;
2122 }
2123
2124 if (type & PERF_SAMPLE_ADDR) {
2125 data->addr = *array;
2126 array++;
2127 }
2128
2129 if (type & PERF_SAMPLE_ID) {
2130 data->id = *array;
2131 array++;
2132 }
2133
2134 if (type & PERF_SAMPLE_STREAM_ID) {
2135 data->stream_id = *array;
2136 array++;
2137 }
2138
2139 if (type & PERF_SAMPLE_CPU) {
2140
2141 u.val64 = *array;
2142 if (swapped) {
2143 /* undo swap of u64, then swap on individual u32s */
2144 u.val64 = bswap_64(u.val64);
2145 u.val32[0] = bswap_32(u.val32[0]);
2146 }
2147
2148 data->cpu = u.val32[0];
2149 array++;
2150 }
2151
2152 if (type & PERF_SAMPLE_PERIOD) {
2153 data->period = *array;
2154 array++;
2155 }
2156
2157 if (type & PERF_SAMPLE_READ) {
2158 u64 read_format = evsel->attr.read_format;
2159
2160 OVERFLOW_CHECK_u64(array);
2161 if (read_format & PERF_FORMAT_GROUP)
2162 data->read.group.nr = *array;
2163 else
2164 data->read.one.value = *array;
2165
2166 array++;
2167
2168 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2169 OVERFLOW_CHECK_u64(array);
2170 data->read.time_enabled = *array;
2171 array++;
2172 }
2173
2174 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2175 OVERFLOW_CHECK_u64(array);
2176 data->read.time_running = *array;
2177 array++;
2178 }
2179
2180 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2181 if (read_format & PERF_FORMAT_GROUP) {
2182 const u64 max_group_nr = UINT64_MAX /
2183 sizeof(struct sample_read_value);
2184
2185 if (data->read.group.nr > max_group_nr)
2186 return -EFAULT;
2187 sz = data->read.group.nr *
2188 sizeof(struct sample_read_value);
2189 OVERFLOW_CHECK(array, sz, max_size);
2190 data->read.group.values =
2191 (struct sample_read_value *)array;
2192 array = (void *)array + sz;
2193 } else {
2194 OVERFLOW_CHECK_u64(array);
2195 data->read.one.id = *array;
2196 array++;
2197 }
2198 }
2199
2200 if (type & PERF_SAMPLE_CALLCHAIN) {
2201 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
2202
2203 OVERFLOW_CHECK_u64(array);
2204 data->callchain = (struct ip_callchain *)array++;
2205 if (data->callchain->nr > max_callchain_nr)
2206 return -EFAULT;
2207 sz = data->callchain->nr * sizeof(u64);
2208 OVERFLOW_CHECK(array, sz, max_size);
2209 array = (void *)array + sz;
2210 }
2211
2212 if (type & PERF_SAMPLE_RAW) {
2213 OVERFLOW_CHECK_u64(array);
2214 u.val64 = *array;
2215
2216 /*
2217 * Undo swap of u64, then swap on individual u32s,
2218 * get the size of the raw area and undo all of the
2219 * swap. The pevent interface handles endianity by
2220 * itself.
2221 */
2222 if (swapped) {
2223 u.val64 = bswap_64(u.val64);
2224 u.val32[0] = bswap_32(u.val32[0]);
2225 u.val32[1] = bswap_32(u.val32[1]);
2226 }
2227 data->raw_size = u.val32[0];
2228
2229 /*
2230 * The raw data is aligned on 64bits including the
2231 * u32 size, so it's safe to use mem_bswap_64.
2232 */
2233 if (swapped)
2234 mem_bswap_64((void *) array, data->raw_size);
2235
2236 array = (void *)array + sizeof(u32);
2237
2238 OVERFLOW_CHECK(array, data->raw_size, max_size);
2239 data->raw_data = (void *)array;
2240 array = (void *)array + data->raw_size;
2241 }
2242
2243 if (type & PERF_SAMPLE_BRANCH_STACK) {
2244 const u64 max_branch_nr = UINT64_MAX /
2245 sizeof(struct branch_entry);
2246
2247 OVERFLOW_CHECK_u64(array);
2248 data->branch_stack = (struct branch_stack *)array++;
2249
2250 if (data->branch_stack->nr > max_branch_nr)
2251 return -EFAULT;
2252 sz = data->branch_stack->nr * sizeof(struct branch_entry);
2253 OVERFLOW_CHECK(array, sz, max_size);
2254 array = (void *)array + sz;
2255 }
2256
2257 if (type & PERF_SAMPLE_REGS_USER) {
2258 OVERFLOW_CHECK_u64(array);
2259 data->user_regs.abi = *array;
2260 array++;
2261
2262 if (data->user_regs.abi) {
2263 u64 mask = evsel->attr.sample_regs_user;
2264
2265 sz = hweight_long(mask) * sizeof(u64);
2266 OVERFLOW_CHECK(array, sz, max_size);
2267 data->user_regs.mask = mask;
2268 data->user_regs.regs = (u64 *)array;
2269 array = (void *)array + sz;
2270 }
2271 }
2272
2273 if (type & PERF_SAMPLE_STACK_USER) {
2274 OVERFLOW_CHECK_u64(array);
2275 sz = *array++;
2276
2277 data->user_stack.offset = ((char *)(array - 1)
2278 - (char *) event);
2279
2280 if (!sz) {
2281 data->user_stack.size = 0;
2282 } else {
2283 OVERFLOW_CHECK(array, sz, max_size);
2284 data->user_stack.data = (char *)array;
2285 array = (void *)array + sz;
2286 OVERFLOW_CHECK_u64(array);
2287 data->user_stack.size = *array++;
2288 if (WARN_ONCE(data->user_stack.size > sz,
2289 "user stack dump failure\n"))
2290 return -EFAULT;
2291 }
2292 }
2293
2294 if (type & PERF_SAMPLE_WEIGHT) {
2295 OVERFLOW_CHECK_u64(array);
2296 data->weight = *array;
2297 array++;
2298 }
2299
2300 if (type & PERF_SAMPLE_DATA_SRC) {
2301 OVERFLOW_CHECK_u64(array);
2302 data->data_src = *array;
2303 array++;
2304 }
2305
2306 if (type & PERF_SAMPLE_TRANSACTION) {
2307 OVERFLOW_CHECK_u64(array);
2308 data->transaction = *array;
2309 array++;
2310 }
2311
2312 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
2313 if (type & PERF_SAMPLE_REGS_INTR) {
2314 OVERFLOW_CHECK_u64(array);
2315 data->intr_regs.abi = *array;
2316 array++;
2317
2318 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
2319 u64 mask = evsel->attr.sample_regs_intr;
2320
2321 sz = hweight_long(mask) * sizeof(u64);
2322 OVERFLOW_CHECK(array, sz, max_size);
2323 data->intr_regs.mask = mask;
2324 data->intr_regs.regs = (u64 *)array;
2325 array = (void *)array + sz;
2326 }
2327 }
2328
2329 data->phys_addr = 0;
2330 if (type & PERF_SAMPLE_PHYS_ADDR) {
2331 data->phys_addr = *array;
2332 array++;
2333 }
2334
2335 return 0;
2336}
2337
2338int perf_evsel__parse_sample_timestamp(struct perf_evsel *evsel,
2339 union perf_event *event,
2340 u64 *timestamp)
2341{
2342 u64 type = evsel->attr.sample_type;
2343 const u64 *array;
2344
2345 if (!(type & PERF_SAMPLE_TIME))
2346 return -1;
2347
2348 if (event->header.type != PERF_RECORD_SAMPLE) {
2349 struct perf_sample data = {
2350 .time = -1ULL,
2351 };
2352
2353 if (!evsel->attr.sample_id_all)
2354 return -1;
2355 if (perf_evsel__parse_id_sample(evsel, event, &data))
2356 return -1;
2357
2358 *timestamp = data.time;
2359 return 0;
2360 }
2361
2362 array = event->sample.array;
2363
2364 if (perf_event__check_size(event, evsel->sample_size))
2365 return -EFAULT;
2366
2367 if (type & PERF_SAMPLE_IDENTIFIER)
2368 array++;
2369
2370 if (type & PERF_SAMPLE_IP)
2371 array++;
2372
2373 if (type & PERF_SAMPLE_TID)
2374 array++;
2375
2376 if (type & PERF_SAMPLE_TIME)
2377 *timestamp = *array;
2378
2379 return 0;
2380}
2381
2382size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
2383 u64 read_format)
2384{
2385 size_t sz, result = sizeof(struct sample_event);
2386
2387 if (type & PERF_SAMPLE_IDENTIFIER)
2388 result += sizeof(u64);
2389
2390 if (type & PERF_SAMPLE_IP)
2391 result += sizeof(u64);
2392
2393 if (type & PERF_SAMPLE_TID)
2394 result += sizeof(u64);
2395
2396 if (type & PERF_SAMPLE_TIME)
2397 result += sizeof(u64);
2398
2399 if (type & PERF_SAMPLE_ADDR)
2400 result += sizeof(u64);
2401
2402 if (type & PERF_SAMPLE_ID)
2403 result += sizeof(u64);
2404
2405 if (type & PERF_SAMPLE_STREAM_ID)
2406 result += sizeof(u64);
2407
2408 if (type & PERF_SAMPLE_CPU)
2409 result += sizeof(u64);
2410
2411 if (type & PERF_SAMPLE_PERIOD)
2412 result += sizeof(u64);
2413
2414 if (type & PERF_SAMPLE_READ) {
2415 result += sizeof(u64);
2416 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
2417 result += sizeof(u64);
2418 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
2419 result += sizeof(u64);
2420 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2421 if (read_format & PERF_FORMAT_GROUP) {
2422 sz = sample->read.group.nr *
2423 sizeof(struct sample_read_value);
2424 result += sz;
2425 } else {
2426 result += sizeof(u64);
2427 }
2428 }
2429
2430 if (type & PERF_SAMPLE_CALLCHAIN) {
2431 sz = (sample->callchain->nr + 1) * sizeof(u64);
2432 result += sz;
2433 }
2434
2435 if (type & PERF_SAMPLE_RAW) {
2436 result += sizeof(u32);
2437 result += sample->raw_size;
2438 }
2439
2440 if (type & PERF_SAMPLE_BRANCH_STACK) {
2441 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2442 sz += sizeof(u64);
2443 result += sz;
2444 }
2445
2446 if (type & PERF_SAMPLE_REGS_USER) {
2447 if (sample->user_regs.abi) {
2448 result += sizeof(u64);
2449 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2450 result += sz;
2451 } else {
2452 result += sizeof(u64);
2453 }
2454 }
2455
2456 if (type & PERF_SAMPLE_STACK_USER) {
2457 sz = sample->user_stack.size;
2458 result += sizeof(u64);
2459 if (sz) {
2460 result += sz;
2461 result += sizeof(u64);
2462 }
2463 }
2464
2465 if (type & PERF_SAMPLE_WEIGHT)
2466 result += sizeof(u64);
2467
2468 if (type & PERF_SAMPLE_DATA_SRC)
2469 result += sizeof(u64);
2470
2471 if (type & PERF_SAMPLE_TRANSACTION)
2472 result += sizeof(u64);
2473
2474 if (type & PERF_SAMPLE_REGS_INTR) {
2475 if (sample->intr_regs.abi) {
2476 result += sizeof(u64);
2477 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
2478 result += sz;
2479 } else {
2480 result += sizeof(u64);
2481 }
2482 }
2483
2484 if (type & PERF_SAMPLE_PHYS_ADDR)
2485 result += sizeof(u64);
2486
2487 return result;
2488}
2489
2490int perf_event__synthesize_sample(union perf_event *event, u64 type,
2491 u64 read_format,
2492 const struct perf_sample *sample)
2493{
2494 u64 *array;
2495 size_t sz;
2496 /*
2497 * used for cross-endian analysis. See git commit 65014ab3
2498 * for why this goofiness is needed.
2499 */
2500 union u64_swap u;
2501
2502 array = event->sample.array;
2503
2504 if (type & PERF_SAMPLE_IDENTIFIER) {
2505 *array = sample->id;
2506 array++;
2507 }
2508
2509 if (type & PERF_SAMPLE_IP) {
2510 *array = sample->ip;
2511 array++;
2512 }
2513
2514 if (type & PERF_SAMPLE_TID) {
2515 u.val32[0] = sample->pid;
2516 u.val32[1] = sample->tid;
2517 *array = u.val64;
2518 array++;
2519 }
2520
2521 if (type & PERF_SAMPLE_TIME) {
2522 *array = sample->time;
2523 array++;
2524 }
2525
2526 if (type & PERF_SAMPLE_ADDR) {
2527 *array = sample->addr;
2528 array++;
2529 }
2530
2531 if (type & PERF_SAMPLE_ID) {
2532 *array = sample->id;
2533 array++;
2534 }
2535
2536 if (type & PERF_SAMPLE_STREAM_ID) {
2537 *array = sample->stream_id;
2538 array++;
2539 }
2540
2541 if (type & PERF_SAMPLE_CPU) {
2542 u.val32[0] = sample->cpu;
2543 u.val32[1] = 0;
2544 *array = u.val64;
2545 array++;
2546 }
2547
2548 if (type & PERF_SAMPLE_PERIOD) {
2549 *array = sample->period;
2550 array++;
2551 }
2552
2553 if (type & PERF_SAMPLE_READ) {
2554 if (read_format & PERF_FORMAT_GROUP)
2555 *array = sample->read.group.nr;
2556 else
2557 *array = sample->read.one.value;
2558 array++;
2559
2560 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2561 *array = sample->read.time_enabled;
2562 array++;
2563 }
2564
2565 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2566 *array = sample->read.time_running;
2567 array++;
2568 }
2569
2570 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2571 if (read_format & PERF_FORMAT_GROUP) {
2572 sz = sample->read.group.nr *
2573 sizeof(struct sample_read_value);
2574 memcpy(array, sample->read.group.values, sz);
2575 array = (void *)array + sz;
2576 } else {
2577 *array = sample->read.one.id;
2578 array++;
2579 }
2580 }
2581
2582 if (type & PERF_SAMPLE_CALLCHAIN) {
2583 sz = (sample->callchain->nr + 1) * sizeof(u64);
2584 memcpy(array, sample->callchain, sz);
2585 array = (void *)array + sz;
2586 }
2587
2588 if (type & PERF_SAMPLE_RAW) {
2589 u.val32[0] = sample->raw_size;
2590 *array = u.val64;
2591 array = (void *)array + sizeof(u32);
2592
2593 memcpy(array, sample->raw_data, sample->raw_size);
2594 array = (void *)array + sample->raw_size;
2595 }
2596
2597 if (type & PERF_SAMPLE_BRANCH_STACK) {
2598 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2599 sz += sizeof(u64);
2600 memcpy(array, sample->branch_stack, sz);
2601 array = (void *)array + sz;
2602 }
2603
2604 if (type & PERF_SAMPLE_REGS_USER) {
2605 if (sample->user_regs.abi) {
2606 *array++ = sample->user_regs.abi;
2607 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2608 memcpy(array, sample->user_regs.regs, sz);
2609 array = (void *)array + sz;
2610 } else {
2611 *array++ = 0;
2612 }
2613 }
2614
2615 if (type & PERF_SAMPLE_STACK_USER) {
2616 sz = sample->user_stack.size;
2617 *array++ = sz;
2618 if (sz) {
2619 memcpy(array, sample->user_stack.data, sz);
2620 array = (void *)array + sz;
2621 *array++ = sz;
2622 }
2623 }
2624
2625 if (type & PERF_SAMPLE_WEIGHT) {
2626 *array = sample->weight;
2627 array++;
2628 }
2629
2630 if (type & PERF_SAMPLE_DATA_SRC) {
2631 *array = sample->data_src;
2632 array++;
2633 }
2634
2635 if (type & PERF_SAMPLE_TRANSACTION) {
2636 *array = sample->transaction;
2637 array++;
2638 }
2639
2640 if (type & PERF_SAMPLE_REGS_INTR) {
2641 if (sample->intr_regs.abi) {
2642 *array++ = sample->intr_regs.abi;
2643 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
2644 memcpy(array, sample->intr_regs.regs, sz);
2645 array = (void *)array + sz;
2646 } else {
2647 *array++ = 0;
2648 }
2649 }
2650
2651 if (type & PERF_SAMPLE_PHYS_ADDR) {
2652 *array = sample->phys_addr;
2653 array++;
2654 }
2655
2656 return 0;
2657}
2658
2659struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
2660{
2661 return pevent_find_field(evsel->tp_format, name);
2662}
2663
2664void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
2665 const char *name)
2666{
2667 struct format_field *field = perf_evsel__field(evsel, name);
2668 int offset;
2669
2670 if (!field)
2671 return NULL;
2672
2673 offset = field->offset;
2674
2675 if (field->flags & FIELD_IS_DYNAMIC) {
2676 offset = *(int *)(sample->raw_data + field->offset);
2677 offset &= 0xffff;
2678 }
2679
2680 return sample->raw_data + offset;
2681}
2682
2683u64 format_field__intval(struct format_field *field, struct perf_sample *sample,
2684 bool needs_swap)
2685{
2686 u64 value;
2687 void *ptr = sample->raw_data + field->offset;
2688
2689 switch (field->size) {
2690 case 1:
2691 return *(u8 *)ptr;
2692 case 2:
2693 value = *(u16 *)ptr;
2694 break;
2695 case 4:
2696 value = *(u32 *)ptr;
2697 break;
2698 case 8:
2699 memcpy(&value, ptr, sizeof(u64));
2700 break;
2701 default:
2702 return 0;
2703 }
2704
2705 if (!needs_swap)
2706 return value;
2707
2708 switch (field->size) {
2709 case 2:
2710 return bswap_16(value);
2711 case 4:
2712 return bswap_32(value);
2713 case 8:
2714 return bswap_64(value);
2715 default:
2716 return 0;
2717 }
2718
2719 return 0;
2720}
2721
2722u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
2723 const char *name)
2724{
2725 struct format_field *field = perf_evsel__field(evsel, name);
2726
2727 if (!field)
2728 return 0;
2729
2730 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2731}
2732
2733bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
2734 char *msg, size_t msgsize)
2735{
2736 int paranoid;
2737
2738 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2739 evsel->attr.type == PERF_TYPE_HARDWARE &&
2740 evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2741 /*
2742 * If it's cycles then fall back to hrtimer based
2743 * cpu-clock-tick sw counter, which is always available even if
2744 * no PMU support.
2745 *
2746 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2747 * b0a873e).
2748 */
2749 scnprintf(msg, msgsize, "%s",
2750"The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2751
2752 evsel->attr.type = PERF_TYPE_SOFTWARE;
2753 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
2754
2755 zfree(&evsel->name);
2756 return true;
2757 } else if (err == EACCES && !evsel->attr.exclude_kernel &&
2758 (paranoid = perf_event_paranoid()) > 1) {
2759 const char *name = perf_evsel__name(evsel);
2760 char *new_name;
2761 const char *sep = ":";
2762
2763 /* Is there already the separator in the name. */
2764 if (strchr(name, '/') ||
2765 strchr(name, ':'))
2766 sep = "";
2767
2768 if (asprintf(&new_name, "%s%su", name, sep) < 0)
2769 return false;
2770
2771 if (evsel->name)
2772 free(evsel->name);
2773 evsel->name = new_name;
2774 scnprintf(msg, msgsize,
2775"kernel.perf_event_paranoid=%d, trying to fall back to excluding kernel samples", paranoid);
2776 evsel->attr.exclude_kernel = 1;
2777
2778 return true;
2779 }
2780
2781 return false;
2782}
2783
2784static bool find_process(const char *name)
2785{
2786 size_t len = strlen(name);
2787 DIR *dir;
2788 struct dirent *d;
2789 int ret = -1;
2790
2791 dir = opendir(procfs__mountpoint());
2792 if (!dir)
2793 return false;
2794
2795 /* Walk through the directory. */
2796 while (ret && (d = readdir(dir)) != NULL) {
2797 char path[PATH_MAX];
2798 char *data;
2799 size_t size;
2800
2801 if ((d->d_type != DT_DIR) ||
2802 !strcmp(".", d->d_name) ||
2803 !strcmp("..", d->d_name))
2804 continue;
2805
2806 scnprintf(path, sizeof(path), "%s/%s/comm",
2807 procfs__mountpoint(), d->d_name);
2808
2809 if (filename__read_str(path, &data, &size))
2810 continue;
2811
2812 ret = strncmp(name, data, len);
2813 free(data);
2814 }
2815
2816 closedir(dir);
2817 return ret ? false : true;
2818}
2819
2820int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
2821 int err, char *msg, size_t size)
2822{
2823 char sbuf[STRERR_BUFSIZE];
2824 int printed = 0;
2825
2826 switch (err) {
2827 case EPERM:
2828 case EACCES:
2829 if (err == EPERM)
2830 printed = scnprintf(msg, size,
2831 "No permission to enable %s event.\n\n",
2832 perf_evsel__name(evsel));
2833
2834 return scnprintf(msg + printed, size - printed,
2835 "You may not have permission to collect %sstats.\n\n"
2836 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
2837 "which controls use of the performance events system by\n"
2838 "unprivileged users (without CAP_SYS_ADMIN).\n\n"
2839 "The current value is %d:\n\n"
2840 " -1: Allow use of (almost) all events by all users\n"
2841 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
2842 ">= 0: Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN\n"
2843 " Disallow raw tracepoint access by users without CAP_SYS_ADMIN\n"
2844 ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
2845 ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN\n\n"
2846 "To make this setting permanent, edit /etc/sysctl.conf too, e.g.:\n\n"
2847 " kernel.perf_event_paranoid = -1\n" ,
2848 target->system_wide ? "system-wide " : "",
2849 perf_event_paranoid());
2850 case ENOENT:
2851 return scnprintf(msg, size, "The %s event is not supported.",
2852 perf_evsel__name(evsel));
2853 case EMFILE:
2854 return scnprintf(msg, size, "%s",
2855 "Too many events are opened.\n"
2856 "Probably the maximum number of open file descriptors has been reached.\n"
2857 "Hint: Try again after reducing the number of events.\n"
2858 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2859 case ENOMEM:
2860 if ((evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN) != 0 &&
2861 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
2862 return scnprintf(msg, size,
2863 "Not enough memory to setup event with callchain.\n"
2864 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
2865 "Hint: Current value: %d", sysctl_perf_event_max_stack);
2866 break;
2867 case ENODEV:
2868 if (target->cpu_list)
2869 return scnprintf(msg, size, "%s",
2870 "No such device - did you specify an out-of-range profile CPU?");
2871 break;
2872 case EOPNOTSUPP:
2873 if (evsel->attr.sample_period != 0)
2874 return scnprintf(msg, size,
2875 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
2876 perf_evsel__name(evsel));
2877 if (evsel->attr.precise_ip)
2878 return scnprintf(msg, size, "%s",
2879 "\'precise\' request may not be supported. Try removing 'p' modifier.");
2880#if defined(__i386__) || defined(__x86_64__)
2881 if (evsel->attr.type == PERF_TYPE_HARDWARE)
2882 return scnprintf(msg, size, "%s",
2883 "No hardware sampling interrupt available.\n");
2884#endif
2885 break;
2886 case EBUSY:
2887 if (find_process("oprofiled"))
2888 return scnprintf(msg, size,
2889 "The PMU counters are busy/taken by another profiler.\n"
2890 "We found oprofile daemon running, please stop it and try again.");
2891 break;
2892 case EINVAL:
2893 if (evsel->attr.write_backward && perf_missing_features.write_backward)
2894 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
2895 if (perf_missing_features.clockid)
2896 return scnprintf(msg, size, "clockid feature not supported.");
2897 if (perf_missing_features.clockid_wrong)
2898 return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2899 break;
2900 default:
2901 break;
2902 }
2903
2904 return scnprintf(msg, size,
2905 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2906 "/bin/dmesg | grep -i perf may provide additional information.\n",
2907 err, str_error_r(err, sbuf, sizeof(sbuf)),
2908 perf_evsel__name(evsel));
2909}
2910
2911struct perf_env *perf_evsel__env(struct perf_evsel *evsel)
2912{
2913 if (evsel && evsel->evlist)
2914 return evsel->evlist->env;
2915 return NULL;
2916}
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 <linux/hw_breakpoint.h>
16#include <linux/perf_event.h>
17#include <linux/compiler.h>
18#include <linux/err.h>
19#include <linux/zalloc.h>
20#include <sys/ioctl.h>
21#include <sys/resource.h>
22#include <sys/types.h>
23#include <dirent.h>
24#include <stdlib.h>
25#include <perf/evsel.h>
26#include "asm/bug.h"
27#include "bpf_counter.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 "util/hashmap.h"
49#include "off_cpu.h"
50#include "pmu.h"
51#include "pmus.h"
52#include "rlimit.h"
53#include "../perf-sys.h"
54#include "util/parse-branch-options.h"
55#include "util/bpf-filter.h"
56#include <internal/xyarray.h>
57#include <internal/lib.h>
58#include <internal/threadmap.h>
59
60#include <linux/ctype.h>
61
62#ifdef HAVE_LIBTRACEEVENT
63#include <traceevent/event-parse.h>
64#endif
65
66struct perf_missing_features perf_missing_features;
67
68static clockid_t clockid;
69
70static const char *const perf_tool_event__tool_names[PERF_TOOL_MAX] = {
71 NULL,
72 "duration_time",
73 "user_time",
74 "system_time",
75};
76
77const char *perf_tool_event__to_str(enum perf_tool_event ev)
78{
79 if (ev > PERF_TOOL_NONE && ev < PERF_TOOL_MAX)
80 return perf_tool_event__tool_names[ev];
81
82 return NULL;
83}
84
85enum perf_tool_event perf_tool_event__from_str(const char *str)
86{
87 int i;
88
89 perf_tool_event__for_each_event(i) {
90 if (!strcmp(str, perf_tool_event__tool_names[i]))
91 return i;
92 }
93 return PERF_TOOL_NONE;
94}
95
96
97static int evsel__no_extra_init(struct evsel *evsel __maybe_unused)
98{
99 return 0;
100}
101
102void __weak test_attr__ready(void) { }
103
104static void evsel__no_extra_fini(struct evsel *evsel __maybe_unused)
105{
106}
107
108static struct {
109 size_t size;
110 int (*init)(struct evsel *evsel);
111 void (*fini)(struct evsel *evsel);
112} perf_evsel__object = {
113 .size = sizeof(struct evsel),
114 .init = evsel__no_extra_init,
115 .fini = evsel__no_extra_fini,
116};
117
118int evsel__object_config(size_t object_size, int (*init)(struct evsel *evsel),
119 void (*fini)(struct evsel *evsel))
120{
121
122 if (object_size == 0)
123 goto set_methods;
124
125 if (perf_evsel__object.size > object_size)
126 return -EINVAL;
127
128 perf_evsel__object.size = object_size;
129
130set_methods:
131 if (init != NULL)
132 perf_evsel__object.init = init;
133
134 if (fini != NULL)
135 perf_evsel__object.fini = fini;
136
137 return 0;
138}
139
140#define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
141
142int __evsel__sample_size(u64 sample_type)
143{
144 u64 mask = sample_type & PERF_SAMPLE_MASK;
145 int size = 0;
146 int i;
147
148 for (i = 0; i < 64; i++) {
149 if (mask & (1ULL << i))
150 size++;
151 }
152
153 size *= sizeof(u64);
154
155 return size;
156}
157
158/**
159 * __perf_evsel__calc_id_pos - calculate id_pos.
160 * @sample_type: sample type
161 *
162 * This function returns the position of the event id (PERF_SAMPLE_ID or
163 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
164 * perf_record_sample.
165 */
166static int __perf_evsel__calc_id_pos(u64 sample_type)
167{
168 int idx = 0;
169
170 if (sample_type & PERF_SAMPLE_IDENTIFIER)
171 return 0;
172
173 if (!(sample_type & PERF_SAMPLE_ID))
174 return -1;
175
176 if (sample_type & PERF_SAMPLE_IP)
177 idx += 1;
178
179 if (sample_type & PERF_SAMPLE_TID)
180 idx += 1;
181
182 if (sample_type & PERF_SAMPLE_TIME)
183 idx += 1;
184
185 if (sample_type & PERF_SAMPLE_ADDR)
186 idx += 1;
187
188 return idx;
189}
190
191/**
192 * __perf_evsel__calc_is_pos - calculate is_pos.
193 * @sample_type: sample type
194 *
195 * This function returns the position (counting backwards) of the event id
196 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
197 * sample_id_all is used there is an id sample appended to non-sample events.
198 */
199static int __perf_evsel__calc_is_pos(u64 sample_type)
200{
201 int idx = 1;
202
203 if (sample_type & PERF_SAMPLE_IDENTIFIER)
204 return 1;
205
206 if (!(sample_type & PERF_SAMPLE_ID))
207 return -1;
208
209 if (sample_type & PERF_SAMPLE_CPU)
210 idx += 1;
211
212 if (sample_type & PERF_SAMPLE_STREAM_ID)
213 idx += 1;
214
215 return idx;
216}
217
218void evsel__calc_id_pos(struct evsel *evsel)
219{
220 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type);
221 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type);
222}
223
224void __evsel__set_sample_bit(struct evsel *evsel,
225 enum perf_event_sample_format bit)
226{
227 if (!(evsel->core.attr.sample_type & bit)) {
228 evsel->core.attr.sample_type |= bit;
229 evsel->sample_size += sizeof(u64);
230 evsel__calc_id_pos(evsel);
231 }
232}
233
234void __evsel__reset_sample_bit(struct evsel *evsel,
235 enum perf_event_sample_format bit)
236{
237 if (evsel->core.attr.sample_type & bit) {
238 evsel->core.attr.sample_type &= ~bit;
239 evsel->sample_size -= sizeof(u64);
240 evsel__calc_id_pos(evsel);
241 }
242}
243
244void evsel__set_sample_id(struct evsel *evsel,
245 bool can_sample_identifier)
246{
247 if (can_sample_identifier) {
248 evsel__reset_sample_bit(evsel, ID);
249 evsel__set_sample_bit(evsel, IDENTIFIER);
250 } else {
251 evsel__set_sample_bit(evsel, ID);
252 }
253 evsel->core.attr.read_format |= PERF_FORMAT_ID;
254}
255
256/**
257 * evsel__is_function_event - Return whether given evsel is a function
258 * trace event
259 *
260 * @evsel - evsel selector to be tested
261 *
262 * Return %true if event is function trace event
263 */
264bool evsel__is_function_event(struct evsel *evsel)
265{
266#define FUNCTION_EVENT "ftrace:function"
267
268 return evsel->name &&
269 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
270
271#undef FUNCTION_EVENT
272}
273
274void evsel__init(struct evsel *evsel,
275 struct perf_event_attr *attr, int idx)
276{
277 perf_evsel__init(&evsel->core, attr, idx);
278 evsel->tracking = !idx;
279 evsel->unit = strdup("");
280 evsel->scale = 1.0;
281 evsel->max_events = ULONG_MAX;
282 evsel->evlist = NULL;
283 evsel->bpf_obj = NULL;
284 evsel->bpf_fd = -1;
285 INIT_LIST_HEAD(&evsel->config_terms);
286 INIT_LIST_HEAD(&evsel->bpf_counter_list);
287 INIT_LIST_HEAD(&evsel->bpf_filters);
288 perf_evsel__object.init(evsel);
289 evsel->sample_size = __evsel__sample_size(attr->sample_type);
290 evsel__calc_id_pos(evsel);
291 evsel->cmdline_group_boundary = false;
292 evsel->metric_events = NULL;
293 evsel->per_pkg_mask = NULL;
294 evsel->collect_stat = false;
295 evsel->pmu_name = NULL;
296 evsel->group_pmu_name = NULL;
297 evsel->skippable = false;
298}
299
300struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx)
301{
302 struct evsel *evsel = zalloc(perf_evsel__object.size);
303
304 if (!evsel)
305 return NULL;
306 evsel__init(evsel, attr, idx);
307
308 if (evsel__is_bpf_output(evsel) && !attr->sample_type) {
309 evsel->core.attr.sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
310 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
311 evsel->core.attr.sample_period = 1;
312 }
313
314 if (evsel__is_clock(evsel)) {
315 free((char *)evsel->unit);
316 evsel->unit = strdup("msec");
317 evsel->scale = 1e-6;
318 }
319
320 return evsel;
321}
322
323int copy_config_terms(struct list_head *dst, struct list_head *src)
324{
325 struct evsel_config_term *pos, *tmp;
326
327 list_for_each_entry(pos, src, list) {
328 tmp = malloc(sizeof(*tmp));
329 if (tmp == NULL)
330 return -ENOMEM;
331
332 *tmp = *pos;
333 if (tmp->free_str) {
334 tmp->val.str = strdup(pos->val.str);
335 if (tmp->val.str == NULL) {
336 free(tmp);
337 return -ENOMEM;
338 }
339 }
340 list_add_tail(&tmp->list, dst);
341 }
342 return 0;
343}
344
345static int evsel__copy_config_terms(struct evsel *dst, struct evsel *src)
346{
347 return copy_config_terms(&dst->config_terms, &src->config_terms);
348}
349
350/**
351 * evsel__clone - create a new evsel copied from @orig
352 * @orig: original evsel
353 *
354 * The assumption is that @orig is not configured nor opened yet.
355 * So we only care about the attributes that can be set while it's parsed.
356 */
357struct evsel *evsel__clone(struct evsel *orig)
358{
359 struct evsel *evsel;
360
361 BUG_ON(orig->core.fd);
362 BUG_ON(orig->counts);
363 BUG_ON(orig->priv);
364 BUG_ON(orig->per_pkg_mask);
365
366 /* cannot handle BPF objects for now */
367 if (orig->bpf_obj)
368 return NULL;
369
370 evsel = evsel__new(&orig->core.attr);
371 if (evsel == NULL)
372 return NULL;
373
374 evsel->core.cpus = perf_cpu_map__get(orig->core.cpus);
375 evsel->core.own_cpus = perf_cpu_map__get(orig->core.own_cpus);
376 evsel->core.threads = perf_thread_map__get(orig->core.threads);
377 evsel->core.nr_members = orig->core.nr_members;
378 evsel->core.system_wide = orig->core.system_wide;
379 evsel->core.requires_cpu = orig->core.requires_cpu;
380 evsel->core.is_pmu_core = orig->core.is_pmu_core;
381
382 if (orig->name) {
383 evsel->name = strdup(orig->name);
384 if (evsel->name == NULL)
385 goto out_err;
386 }
387 if (orig->group_name) {
388 evsel->group_name = strdup(orig->group_name);
389 if (evsel->group_name == NULL)
390 goto out_err;
391 }
392 if (orig->pmu_name) {
393 evsel->pmu_name = strdup(orig->pmu_name);
394 if (evsel->pmu_name == NULL)
395 goto out_err;
396 }
397 if (orig->group_pmu_name) {
398 evsel->group_pmu_name = strdup(orig->group_pmu_name);
399 if (evsel->group_pmu_name == NULL)
400 goto out_err;
401 }
402 if (orig->filter) {
403 evsel->filter = strdup(orig->filter);
404 if (evsel->filter == NULL)
405 goto out_err;
406 }
407 if (orig->metric_id) {
408 evsel->metric_id = strdup(orig->metric_id);
409 if (evsel->metric_id == NULL)
410 goto out_err;
411 }
412 evsel->cgrp = cgroup__get(orig->cgrp);
413#ifdef HAVE_LIBTRACEEVENT
414 evsel->tp_format = orig->tp_format;
415#endif
416 evsel->handler = orig->handler;
417 evsel->core.leader = orig->core.leader;
418
419 evsel->max_events = orig->max_events;
420 evsel->tool_event = orig->tool_event;
421 free((char *)evsel->unit);
422 evsel->unit = strdup(orig->unit);
423 if (evsel->unit == NULL)
424 goto out_err;
425
426 evsel->scale = orig->scale;
427 evsel->snapshot = orig->snapshot;
428 evsel->per_pkg = orig->per_pkg;
429 evsel->percore = orig->percore;
430 evsel->precise_max = orig->precise_max;
431 evsel->is_libpfm_event = orig->is_libpfm_event;
432
433 evsel->exclude_GH = orig->exclude_GH;
434 evsel->sample_read = orig->sample_read;
435 evsel->auto_merge_stats = orig->auto_merge_stats;
436 evsel->collect_stat = orig->collect_stat;
437 evsel->weak_group = orig->weak_group;
438 evsel->use_config_name = orig->use_config_name;
439 evsel->pmu = orig->pmu;
440
441 if (evsel__copy_config_terms(evsel, orig) < 0)
442 goto out_err;
443
444 return evsel;
445
446out_err:
447 evsel__delete(evsel);
448 return NULL;
449}
450
451/*
452 * Returns pointer with encoded error via <linux/err.h> interface.
453 */
454#ifdef HAVE_LIBTRACEEVENT
455struct evsel *evsel__newtp_idx(const char *sys, const char *name, int idx)
456{
457 struct evsel *evsel = zalloc(perf_evsel__object.size);
458 int err = -ENOMEM;
459
460 if (evsel == NULL) {
461 goto out_err;
462 } else {
463 struct perf_event_attr attr = {
464 .type = PERF_TYPE_TRACEPOINT,
465 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
466 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
467 };
468
469 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
470 goto out_free;
471
472 evsel->tp_format = trace_event__tp_format(sys, name);
473 if (IS_ERR(evsel->tp_format)) {
474 err = PTR_ERR(evsel->tp_format);
475 goto out_free;
476 }
477
478 event_attr_init(&attr);
479 attr.config = evsel->tp_format->id;
480 attr.sample_period = 1;
481 evsel__init(evsel, &attr, idx);
482 }
483
484 return evsel;
485
486out_free:
487 zfree(&evsel->name);
488 free(evsel);
489out_err:
490 return ERR_PTR(err);
491}
492#endif
493
494const char *const evsel__hw_names[PERF_COUNT_HW_MAX] = {
495 "cycles",
496 "instructions",
497 "cache-references",
498 "cache-misses",
499 "branches",
500 "branch-misses",
501 "bus-cycles",
502 "stalled-cycles-frontend",
503 "stalled-cycles-backend",
504 "ref-cycles",
505};
506
507char *evsel__bpf_counter_events;
508
509bool evsel__match_bpf_counter_events(const char *name)
510{
511 int name_len;
512 bool match;
513 char *ptr;
514
515 if (!evsel__bpf_counter_events)
516 return false;
517
518 ptr = strstr(evsel__bpf_counter_events, name);
519 name_len = strlen(name);
520
521 /* check name matches a full token in evsel__bpf_counter_events */
522 match = (ptr != NULL) &&
523 ((ptr == evsel__bpf_counter_events) || (*(ptr - 1) == ',')) &&
524 ((*(ptr + name_len) == ',') || (*(ptr + name_len) == '\0'));
525
526 return match;
527}
528
529static const char *__evsel__hw_name(u64 config)
530{
531 if (config < PERF_COUNT_HW_MAX && evsel__hw_names[config])
532 return evsel__hw_names[config];
533
534 return "unknown-hardware";
535}
536
537static int evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size)
538{
539 int colon = 0, r = 0;
540 struct perf_event_attr *attr = &evsel->core.attr;
541 bool exclude_guest_default = false;
542
543#define MOD_PRINT(context, mod) do { \
544 if (!attr->exclude_##context) { \
545 if (!colon) colon = ++r; \
546 r += scnprintf(bf + r, size - r, "%c", mod); \
547 } } while(0)
548
549 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
550 MOD_PRINT(kernel, 'k');
551 MOD_PRINT(user, 'u');
552 MOD_PRINT(hv, 'h');
553 exclude_guest_default = true;
554 }
555
556 if (attr->precise_ip) {
557 if (!colon)
558 colon = ++r;
559 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
560 exclude_guest_default = true;
561 }
562
563 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
564 MOD_PRINT(host, 'H');
565 MOD_PRINT(guest, 'G');
566 }
567#undef MOD_PRINT
568 if (colon)
569 bf[colon - 1] = ':';
570 return r;
571}
572
573int __weak arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
574{
575 return scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config));
576}
577
578static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
579{
580 int r = arch_evsel__hw_name(evsel, bf, size);
581 return r + evsel__add_modifiers(evsel, bf + r, size - r);
582}
583
584const char *const evsel__sw_names[PERF_COUNT_SW_MAX] = {
585 "cpu-clock",
586 "task-clock",
587 "page-faults",
588 "context-switches",
589 "cpu-migrations",
590 "minor-faults",
591 "major-faults",
592 "alignment-faults",
593 "emulation-faults",
594 "dummy",
595};
596
597static const char *__evsel__sw_name(u64 config)
598{
599 if (config < PERF_COUNT_SW_MAX && evsel__sw_names[config])
600 return evsel__sw_names[config];
601 return "unknown-software";
602}
603
604static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size)
605{
606 int r = scnprintf(bf, size, "%s", __evsel__sw_name(evsel->core.attr.config));
607 return r + evsel__add_modifiers(evsel, bf + r, size - r);
608}
609
610static int evsel__tool_name(enum perf_tool_event ev, char *bf, size_t size)
611{
612 return scnprintf(bf, size, "%s", perf_tool_event__to_str(ev));
613}
614
615static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
616{
617 int r;
618
619 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
620
621 if (type & HW_BREAKPOINT_R)
622 r += scnprintf(bf + r, size - r, "r");
623
624 if (type & HW_BREAKPOINT_W)
625 r += scnprintf(bf + r, size - r, "w");
626
627 if (type & HW_BREAKPOINT_X)
628 r += scnprintf(bf + r, size - r, "x");
629
630 return r;
631}
632
633static int evsel__bp_name(struct evsel *evsel, char *bf, size_t size)
634{
635 struct perf_event_attr *attr = &evsel->core.attr;
636 int r = __evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
637 return r + evsel__add_modifiers(evsel, bf + r, size - r);
638}
639
640const char *const evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX][EVSEL__MAX_ALIASES] = {
641 { "L1-dcache", "l1-d", "l1d", "L1-data", },
642 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
643 { "LLC", "L2", },
644 { "dTLB", "d-tlb", "Data-TLB", },
645 { "iTLB", "i-tlb", "Instruction-TLB", },
646 { "branch", "branches", "bpu", "btb", "bpc", },
647 { "node", },
648};
649
650const char *const evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX][EVSEL__MAX_ALIASES] = {
651 { "load", "loads", "read", },
652 { "store", "stores", "write", },
653 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
654};
655
656const char *const evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX][EVSEL__MAX_ALIASES] = {
657 { "refs", "Reference", "ops", "access", },
658 { "misses", "miss", },
659};
660
661#define C(x) PERF_COUNT_HW_CACHE_##x
662#define CACHE_READ (1 << C(OP_READ))
663#define CACHE_WRITE (1 << C(OP_WRITE))
664#define CACHE_PREFETCH (1 << C(OP_PREFETCH))
665#define COP(x) (1 << x)
666
667/*
668 * cache operation stat
669 * L1I : Read and prefetch only
670 * ITLB and BPU : Read-only
671 */
672static const unsigned long evsel__hw_cache_stat[C(MAX)] = {
673 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
674 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
675 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
676 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
677 [C(ITLB)] = (CACHE_READ),
678 [C(BPU)] = (CACHE_READ),
679 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
680};
681
682bool evsel__is_cache_op_valid(u8 type, u8 op)
683{
684 if (evsel__hw_cache_stat[type] & COP(op))
685 return true; /* valid */
686 else
687 return false; /* invalid */
688}
689
690int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size)
691{
692 if (result) {
693 return scnprintf(bf, size, "%s-%s-%s", evsel__hw_cache[type][0],
694 evsel__hw_cache_op[op][0],
695 evsel__hw_cache_result[result][0]);
696 }
697
698 return scnprintf(bf, size, "%s-%s", evsel__hw_cache[type][0],
699 evsel__hw_cache_op[op][1]);
700}
701
702static int __evsel__hw_cache_name(u64 config, char *bf, size_t size)
703{
704 u8 op, result, type = (config >> 0) & 0xff;
705 const char *err = "unknown-ext-hardware-cache-type";
706
707 if (type >= PERF_COUNT_HW_CACHE_MAX)
708 goto out_err;
709
710 op = (config >> 8) & 0xff;
711 err = "unknown-ext-hardware-cache-op";
712 if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
713 goto out_err;
714
715 result = (config >> 16) & 0xff;
716 err = "unknown-ext-hardware-cache-result";
717 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
718 goto out_err;
719
720 err = "invalid-cache";
721 if (!evsel__is_cache_op_valid(type, op))
722 goto out_err;
723
724 return __evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
725out_err:
726 return scnprintf(bf, size, "%s", err);
727}
728
729static int evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size)
730{
731 int ret = __evsel__hw_cache_name(evsel->core.attr.config, bf, size);
732 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret);
733}
734
735static int evsel__raw_name(struct evsel *evsel, char *bf, size_t size)
736{
737 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config);
738 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret);
739}
740
741const char *evsel__name(struct evsel *evsel)
742{
743 char bf[128];
744
745 if (!evsel)
746 goto out_unknown;
747
748 if (evsel->name)
749 return evsel->name;
750
751 switch (evsel->core.attr.type) {
752 case PERF_TYPE_RAW:
753 evsel__raw_name(evsel, bf, sizeof(bf));
754 break;
755
756 case PERF_TYPE_HARDWARE:
757 evsel__hw_name(evsel, bf, sizeof(bf));
758 break;
759
760 case PERF_TYPE_HW_CACHE:
761 evsel__hw_cache_name(evsel, bf, sizeof(bf));
762 break;
763
764 case PERF_TYPE_SOFTWARE:
765 if (evsel__is_tool(evsel))
766 evsel__tool_name(evsel->tool_event, bf, sizeof(bf));
767 else
768 evsel__sw_name(evsel, bf, sizeof(bf));
769 break;
770
771 case PERF_TYPE_TRACEPOINT:
772 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
773 break;
774
775 case PERF_TYPE_BREAKPOINT:
776 evsel__bp_name(evsel, bf, sizeof(bf));
777 break;
778
779 default:
780 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
781 evsel->core.attr.type);
782 break;
783 }
784
785 evsel->name = strdup(bf);
786
787 if (evsel->name)
788 return evsel->name;
789out_unknown:
790 return "unknown";
791}
792
793bool evsel__name_is(struct evsel *evsel, const char *name)
794{
795 return !strcmp(evsel__name(evsel), name);
796}
797
798const char *evsel__metric_id(const struct evsel *evsel)
799{
800 if (evsel->metric_id)
801 return evsel->metric_id;
802
803 if (evsel__is_tool(evsel))
804 return perf_tool_event__to_str(evsel->tool_event);
805
806 return "unknown";
807}
808
809const char *evsel__group_name(struct evsel *evsel)
810{
811 return evsel->group_name ?: "anon group";
812}
813
814/*
815 * Returns the group details for the specified leader,
816 * with following rules.
817 *
818 * For record -e '{cycles,instructions}'
819 * 'anon group { cycles:u, instructions:u }'
820 *
821 * For record -e 'cycles,instructions' and report --group
822 * 'cycles:u, instructions:u'
823 */
824int evsel__group_desc(struct evsel *evsel, char *buf, size_t size)
825{
826 int ret = 0;
827 struct evsel *pos;
828 const char *group_name = evsel__group_name(evsel);
829
830 if (!evsel->forced_leader)
831 ret = scnprintf(buf, size, "%s { ", group_name);
832
833 ret += scnprintf(buf + ret, size - ret, "%s", evsel__name(evsel));
834
835 for_each_group_member(pos, evsel)
836 ret += scnprintf(buf + ret, size - ret, ", %s", evsel__name(pos));
837
838 if (!evsel->forced_leader)
839 ret += scnprintf(buf + ret, size - ret, " }");
840
841 return ret;
842}
843
844static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *opts,
845 struct callchain_param *param)
846{
847 bool function = evsel__is_function_event(evsel);
848 struct perf_event_attr *attr = &evsel->core.attr;
849 const char *arch = perf_env__arch(evsel__env(evsel));
850
851 evsel__set_sample_bit(evsel, CALLCHAIN);
852
853 attr->sample_max_stack = param->max_stack;
854
855 if (opts->kernel_callchains)
856 attr->exclude_callchain_user = 1;
857 if (opts->user_callchains)
858 attr->exclude_callchain_kernel = 1;
859 if (param->record_mode == CALLCHAIN_LBR) {
860 if (!opts->branch_stack) {
861 if (attr->exclude_user) {
862 pr_warning("LBR callstack option is only available "
863 "to get user callchain information. "
864 "Falling back to framepointers.\n");
865 } else {
866 evsel__set_sample_bit(evsel, BRANCH_STACK);
867 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
868 PERF_SAMPLE_BRANCH_CALL_STACK |
869 PERF_SAMPLE_BRANCH_NO_CYCLES |
870 PERF_SAMPLE_BRANCH_NO_FLAGS |
871 PERF_SAMPLE_BRANCH_HW_INDEX;
872 }
873 } else
874 pr_warning("Cannot use LBR callstack with branch stack. "
875 "Falling back to framepointers.\n");
876 }
877
878 if (param->record_mode == CALLCHAIN_DWARF) {
879 if (!function) {
880 evsel__set_sample_bit(evsel, REGS_USER);
881 evsel__set_sample_bit(evsel, STACK_USER);
882 if (opts->sample_user_regs &&
883 DWARF_MINIMAL_REGS(arch) != arch__user_reg_mask()) {
884 attr->sample_regs_user |= DWARF_MINIMAL_REGS(arch);
885 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, "
886 "specifying a subset with --user-regs may render DWARF unwinding unreliable, "
887 "so the minimal registers set (IP, SP) is explicitly forced.\n");
888 } else {
889 attr->sample_regs_user |= arch__user_reg_mask();
890 }
891 attr->sample_stack_user = param->dump_size;
892 attr->exclude_callchain_user = 1;
893 } else {
894 pr_info("Cannot use DWARF unwind for function trace event,"
895 " falling back to framepointers.\n");
896 }
897 }
898
899 if (function) {
900 pr_info("Disabling user space callchains for function trace event.\n");
901 attr->exclude_callchain_user = 1;
902 }
903}
904
905void evsel__config_callchain(struct evsel *evsel, struct record_opts *opts,
906 struct callchain_param *param)
907{
908 if (param->enabled)
909 return __evsel__config_callchain(evsel, opts, param);
910}
911
912static void evsel__reset_callgraph(struct evsel *evsel, struct callchain_param *param)
913{
914 struct perf_event_attr *attr = &evsel->core.attr;
915
916 evsel__reset_sample_bit(evsel, CALLCHAIN);
917 if (param->record_mode == CALLCHAIN_LBR) {
918 evsel__reset_sample_bit(evsel, BRANCH_STACK);
919 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
920 PERF_SAMPLE_BRANCH_CALL_STACK |
921 PERF_SAMPLE_BRANCH_HW_INDEX);
922 }
923 if (param->record_mode == CALLCHAIN_DWARF) {
924 evsel__reset_sample_bit(evsel, REGS_USER);
925 evsel__reset_sample_bit(evsel, STACK_USER);
926 }
927}
928
929static void evsel__apply_config_terms(struct evsel *evsel,
930 struct record_opts *opts, bool track)
931{
932 struct evsel_config_term *term;
933 struct list_head *config_terms = &evsel->config_terms;
934 struct perf_event_attr *attr = &evsel->core.attr;
935 /* callgraph default */
936 struct callchain_param param = {
937 .record_mode = callchain_param.record_mode,
938 };
939 u32 dump_size = 0;
940 int max_stack = 0;
941 const char *callgraph_buf = NULL;
942
943 list_for_each_entry(term, config_terms, list) {
944 switch (term->type) {
945 case EVSEL__CONFIG_TERM_PERIOD:
946 if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
947 attr->sample_period = term->val.period;
948 attr->freq = 0;
949 evsel__reset_sample_bit(evsel, PERIOD);
950 }
951 break;
952 case EVSEL__CONFIG_TERM_FREQ:
953 if (!(term->weak && opts->user_freq != UINT_MAX)) {
954 attr->sample_freq = term->val.freq;
955 attr->freq = 1;
956 evsel__set_sample_bit(evsel, PERIOD);
957 }
958 break;
959 case EVSEL__CONFIG_TERM_TIME:
960 if (term->val.time)
961 evsel__set_sample_bit(evsel, TIME);
962 else
963 evsel__reset_sample_bit(evsel, TIME);
964 break;
965 case EVSEL__CONFIG_TERM_CALLGRAPH:
966 callgraph_buf = term->val.str;
967 break;
968 case EVSEL__CONFIG_TERM_BRANCH:
969 if (term->val.str && strcmp(term->val.str, "no")) {
970 evsel__set_sample_bit(evsel, BRANCH_STACK);
971 parse_branch_str(term->val.str,
972 &attr->branch_sample_type);
973 } else
974 evsel__reset_sample_bit(evsel, BRANCH_STACK);
975 break;
976 case EVSEL__CONFIG_TERM_STACK_USER:
977 dump_size = term->val.stack_user;
978 break;
979 case EVSEL__CONFIG_TERM_MAX_STACK:
980 max_stack = term->val.max_stack;
981 break;
982 case EVSEL__CONFIG_TERM_MAX_EVENTS:
983 evsel->max_events = term->val.max_events;
984 break;
985 case EVSEL__CONFIG_TERM_INHERIT:
986 /*
987 * attr->inherit should has already been set by
988 * evsel__config. If user explicitly set
989 * inherit using config terms, override global
990 * opt->no_inherit setting.
991 */
992 attr->inherit = term->val.inherit ? 1 : 0;
993 break;
994 case EVSEL__CONFIG_TERM_OVERWRITE:
995 attr->write_backward = term->val.overwrite ? 1 : 0;
996 break;
997 case EVSEL__CONFIG_TERM_DRV_CFG:
998 break;
999 case EVSEL__CONFIG_TERM_PERCORE:
1000 break;
1001 case EVSEL__CONFIG_TERM_AUX_OUTPUT:
1002 attr->aux_output = term->val.aux_output ? 1 : 0;
1003 break;
1004 case EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE:
1005 /* Already applied by auxtrace */
1006 break;
1007 case EVSEL__CONFIG_TERM_CFG_CHG:
1008 break;
1009 default:
1010 break;
1011 }
1012 }
1013
1014 /* User explicitly set per-event callgraph, clear the old setting and reset. */
1015 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
1016 bool sample_address = false;
1017
1018 if (max_stack) {
1019 param.max_stack = max_stack;
1020 if (callgraph_buf == NULL)
1021 callgraph_buf = "fp";
1022 }
1023
1024 /* parse callgraph parameters */
1025 if (callgraph_buf != NULL) {
1026 if (!strcmp(callgraph_buf, "no")) {
1027 param.enabled = false;
1028 param.record_mode = CALLCHAIN_NONE;
1029 } else {
1030 param.enabled = true;
1031 if (parse_callchain_record(callgraph_buf, ¶m)) {
1032 pr_err("per-event callgraph setting for %s failed. "
1033 "Apply callgraph global setting for it\n",
1034 evsel->name);
1035 return;
1036 }
1037 if (param.record_mode == CALLCHAIN_DWARF)
1038 sample_address = true;
1039 }
1040 }
1041 if (dump_size > 0) {
1042 dump_size = round_up(dump_size, sizeof(u64));
1043 param.dump_size = dump_size;
1044 }
1045
1046 /* If global callgraph set, clear it */
1047 if (callchain_param.enabled)
1048 evsel__reset_callgraph(evsel, &callchain_param);
1049
1050 /* set perf-event callgraph */
1051 if (param.enabled) {
1052 if (sample_address) {
1053 evsel__set_sample_bit(evsel, ADDR);
1054 evsel__set_sample_bit(evsel, DATA_SRC);
1055 evsel->core.attr.mmap_data = track;
1056 }
1057 evsel__config_callchain(evsel, opts, ¶m);
1058 }
1059 }
1060}
1061
1062struct evsel_config_term *__evsel__get_config_term(struct evsel *evsel, enum evsel_term_type type)
1063{
1064 struct evsel_config_term *term, *found_term = NULL;
1065
1066 list_for_each_entry(term, &evsel->config_terms, list) {
1067 if (term->type == type)
1068 found_term = term;
1069 }
1070
1071 return found_term;
1072}
1073
1074void __weak arch_evsel__set_sample_weight(struct evsel *evsel)
1075{
1076 evsel__set_sample_bit(evsel, WEIGHT);
1077}
1078
1079void __weak arch__post_evsel_config(struct evsel *evsel __maybe_unused,
1080 struct perf_event_attr *attr __maybe_unused)
1081{
1082}
1083
1084static void evsel__set_default_freq_period(struct record_opts *opts,
1085 struct perf_event_attr *attr)
1086{
1087 if (opts->freq) {
1088 attr->freq = 1;
1089 attr->sample_freq = opts->freq;
1090 } else {
1091 attr->sample_period = opts->default_interval;
1092 }
1093}
1094
1095static bool evsel__is_offcpu_event(struct evsel *evsel)
1096{
1097 return evsel__is_bpf_output(evsel) && evsel__name_is(evsel, OFFCPU_EVENT);
1098}
1099
1100/*
1101 * The enable_on_exec/disabled value strategy:
1102 *
1103 * 1) For any type of traced program:
1104 * - all independent events and group leaders are disabled
1105 * - all group members are enabled
1106 *
1107 * Group members are ruled by group leaders. They need to
1108 * be enabled, because the group scheduling relies on that.
1109 *
1110 * 2) For traced programs executed by perf:
1111 * - all independent events and group leaders have
1112 * enable_on_exec set
1113 * - we don't specifically enable or disable any event during
1114 * the record command
1115 *
1116 * Independent events and group leaders are initially disabled
1117 * and get enabled by exec. Group members are ruled by group
1118 * leaders as stated in 1).
1119 *
1120 * 3) For traced programs attached by perf (pid/tid):
1121 * - we specifically enable or disable all events during
1122 * the record command
1123 *
1124 * When attaching events to already running traced we
1125 * enable/disable events specifically, as there's no
1126 * initial traced exec call.
1127 */
1128void evsel__config(struct evsel *evsel, struct record_opts *opts,
1129 struct callchain_param *callchain)
1130{
1131 struct evsel *leader = evsel__leader(evsel);
1132 struct perf_event_attr *attr = &evsel->core.attr;
1133 int track = evsel->tracking;
1134 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
1135
1136 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
1137 attr->inherit = !opts->no_inherit;
1138 attr->write_backward = opts->overwrite ? 1 : 0;
1139 attr->read_format = PERF_FORMAT_LOST;
1140
1141 evsel__set_sample_bit(evsel, IP);
1142 evsel__set_sample_bit(evsel, TID);
1143
1144 if (evsel->sample_read) {
1145 evsel__set_sample_bit(evsel, READ);
1146
1147 /*
1148 * We need ID even in case of single event, because
1149 * PERF_SAMPLE_READ process ID specific data.
1150 */
1151 evsel__set_sample_id(evsel, false);
1152
1153 /*
1154 * Apply group format only if we belong to group
1155 * with more than one members.
1156 */
1157 if (leader->core.nr_members > 1) {
1158 attr->read_format |= PERF_FORMAT_GROUP;
1159 attr->inherit = 0;
1160 }
1161 }
1162
1163 /*
1164 * We default some events to have a default interval. But keep
1165 * it a weak assumption overridable by the user.
1166 */
1167 if ((evsel->is_libpfm_event && !attr->sample_period) ||
1168 (!evsel->is_libpfm_event && (!attr->sample_period ||
1169 opts->user_freq != UINT_MAX ||
1170 opts->user_interval != ULLONG_MAX)))
1171 evsel__set_default_freq_period(opts, attr);
1172
1173 /*
1174 * If attr->freq was set (here or earlier), ask for period
1175 * to be sampled.
1176 */
1177 if (attr->freq)
1178 evsel__set_sample_bit(evsel, PERIOD);
1179
1180 if (opts->no_samples)
1181 attr->sample_freq = 0;
1182
1183 if (opts->inherit_stat) {
1184 evsel->core.attr.read_format |=
1185 PERF_FORMAT_TOTAL_TIME_ENABLED |
1186 PERF_FORMAT_TOTAL_TIME_RUNNING |
1187 PERF_FORMAT_ID;
1188 attr->inherit_stat = 1;
1189 }
1190
1191 if (opts->sample_address) {
1192 evsel__set_sample_bit(evsel, ADDR);
1193 attr->mmap_data = track;
1194 }
1195
1196 /*
1197 * We don't allow user space callchains for function trace
1198 * event, due to issues with page faults while tracing page
1199 * fault handler and its overall trickiness nature.
1200 */
1201 if (evsel__is_function_event(evsel))
1202 evsel->core.attr.exclude_callchain_user = 1;
1203
1204 if (callchain && callchain->enabled && !evsel->no_aux_samples)
1205 evsel__config_callchain(evsel, opts, callchain);
1206
1207 if (opts->sample_intr_regs && !evsel->no_aux_samples &&
1208 !evsel__is_dummy_event(evsel)) {
1209 attr->sample_regs_intr = opts->sample_intr_regs;
1210 evsel__set_sample_bit(evsel, REGS_INTR);
1211 }
1212
1213 if (opts->sample_user_regs && !evsel->no_aux_samples &&
1214 !evsel__is_dummy_event(evsel)) {
1215 attr->sample_regs_user |= opts->sample_user_regs;
1216 evsel__set_sample_bit(evsel, REGS_USER);
1217 }
1218
1219 if (target__has_cpu(&opts->target) || opts->sample_cpu)
1220 evsel__set_sample_bit(evsel, CPU);
1221
1222 /*
1223 * When the user explicitly disabled time don't force it here.
1224 */
1225 if (opts->sample_time &&
1226 (!perf_missing_features.sample_id_all &&
1227 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
1228 opts->sample_time_set)))
1229 evsel__set_sample_bit(evsel, TIME);
1230
1231 if (opts->raw_samples && !evsel->no_aux_samples) {
1232 evsel__set_sample_bit(evsel, TIME);
1233 evsel__set_sample_bit(evsel, RAW);
1234 evsel__set_sample_bit(evsel, CPU);
1235 }
1236
1237 if (opts->sample_address)
1238 evsel__set_sample_bit(evsel, DATA_SRC);
1239
1240 if (opts->sample_phys_addr)
1241 evsel__set_sample_bit(evsel, PHYS_ADDR);
1242
1243 if (opts->no_buffering) {
1244 attr->watermark = 0;
1245 attr->wakeup_events = 1;
1246 }
1247 if (opts->branch_stack && !evsel->no_aux_samples) {
1248 evsel__set_sample_bit(evsel, BRANCH_STACK);
1249 attr->branch_sample_type = opts->branch_stack;
1250 }
1251
1252 if (opts->sample_weight)
1253 arch_evsel__set_sample_weight(evsel);
1254
1255 attr->task = track;
1256 attr->mmap = track;
1257 attr->mmap2 = track && !perf_missing_features.mmap2;
1258 attr->comm = track;
1259 attr->build_id = track && opts->build_id;
1260
1261 /*
1262 * ksymbol is tracked separately with text poke because it needs to be
1263 * system wide and enabled immediately.
1264 */
1265 if (!opts->text_poke)
1266 attr->ksymbol = track && !perf_missing_features.ksymbol;
1267 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf;
1268
1269 if (opts->record_namespaces)
1270 attr->namespaces = track;
1271
1272 if (opts->record_cgroup) {
1273 attr->cgroup = track && !perf_missing_features.cgroup;
1274 evsel__set_sample_bit(evsel, CGROUP);
1275 }
1276
1277 if (opts->sample_data_page_size)
1278 evsel__set_sample_bit(evsel, DATA_PAGE_SIZE);
1279
1280 if (opts->sample_code_page_size)
1281 evsel__set_sample_bit(evsel, CODE_PAGE_SIZE);
1282
1283 if (opts->record_switch_events)
1284 attr->context_switch = track;
1285
1286 if (opts->sample_transaction)
1287 evsel__set_sample_bit(evsel, TRANSACTION);
1288
1289 if (opts->running_time) {
1290 evsel->core.attr.read_format |=
1291 PERF_FORMAT_TOTAL_TIME_ENABLED |
1292 PERF_FORMAT_TOTAL_TIME_RUNNING;
1293 }
1294
1295 /*
1296 * XXX see the function comment above
1297 *
1298 * Disabling only independent events or group leaders,
1299 * keeping group members enabled.
1300 */
1301 if (evsel__is_group_leader(evsel))
1302 attr->disabled = 1;
1303
1304 /*
1305 * Setting enable_on_exec for independent events and
1306 * group leaders for traced executed by perf.
1307 */
1308 if (target__none(&opts->target) && evsel__is_group_leader(evsel) &&
1309 !opts->target.initial_delay)
1310 attr->enable_on_exec = 1;
1311
1312 if (evsel->immediate) {
1313 attr->disabled = 0;
1314 attr->enable_on_exec = 0;
1315 }
1316
1317 clockid = opts->clockid;
1318 if (opts->use_clockid) {
1319 attr->use_clockid = 1;
1320 attr->clockid = opts->clockid;
1321 }
1322
1323 if (evsel->precise_max)
1324 attr->precise_ip = 3;
1325
1326 if (opts->all_user) {
1327 attr->exclude_kernel = 1;
1328 attr->exclude_user = 0;
1329 }
1330
1331 if (opts->all_kernel) {
1332 attr->exclude_kernel = 0;
1333 attr->exclude_user = 1;
1334 }
1335
1336 if (evsel->core.own_cpus || evsel->unit)
1337 evsel->core.attr.read_format |= PERF_FORMAT_ID;
1338
1339 /*
1340 * Apply event specific term settings,
1341 * it overloads any global configuration.
1342 */
1343 evsel__apply_config_terms(evsel, opts, track);
1344
1345 evsel->ignore_missing_thread = opts->ignore_missing_thread;
1346
1347 /* The --period option takes the precedence. */
1348 if (opts->period_set) {
1349 if (opts->period)
1350 evsel__set_sample_bit(evsel, PERIOD);
1351 else
1352 evsel__reset_sample_bit(evsel, PERIOD);
1353 }
1354
1355 /*
1356 * A dummy event never triggers any actual counter and therefore
1357 * cannot be used with branch_stack.
1358 *
1359 * For initial_delay, a dummy event is added implicitly.
1360 * The software event will trigger -EOPNOTSUPP error out,
1361 * if BRANCH_STACK bit is set.
1362 */
1363 if (evsel__is_dummy_event(evsel))
1364 evsel__reset_sample_bit(evsel, BRANCH_STACK);
1365
1366 if (evsel__is_offcpu_event(evsel))
1367 evsel->core.attr.sample_type &= OFFCPU_SAMPLE_TYPES;
1368
1369 arch__post_evsel_config(evsel, attr);
1370}
1371
1372int evsel__set_filter(struct evsel *evsel, const char *filter)
1373{
1374 char *new_filter = strdup(filter);
1375
1376 if (new_filter != NULL) {
1377 free(evsel->filter);
1378 evsel->filter = new_filter;
1379 return 0;
1380 }
1381
1382 return -1;
1383}
1384
1385static int evsel__append_filter(struct evsel *evsel, const char *fmt, const char *filter)
1386{
1387 char *new_filter;
1388
1389 if (evsel->filter == NULL)
1390 return evsel__set_filter(evsel, filter);
1391
1392 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1393 free(evsel->filter);
1394 evsel->filter = new_filter;
1395 return 0;
1396 }
1397
1398 return -1;
1399}
1400
1401int evsel__append_tp_filter(struct evsel *evsel, const char *filter)
1402{
1403 return evsel__append_filter(evsel, "(%s) && (%s)", filter);
1404}
1405
1406int evsel__append_addr_filter(struct evsel *evsel, const char *filter)
1407{
1408 return evsel__append_filter(evsel, "%s,%s", filter);
1409}
1410
1411/* Caller has to clear disabled after going through all CPUs. */
1412int evsel__enable_cpu(struct evsel *evsel, int cpu_map_idx)
1413{
1414 return perf_evsel__enable_cpu(&evsel->core, cpu_map_idx);
1415}
1416
1417int evsel__enable(struct evsel *evsel)
1418{
1419 int err = perf_evsel__enable(&evsel->core);
1420
1421 if (!err)
1422 evsel->disabled = false;
1423 return err;
1424}
1425
1426/* Caller has to set disabled after going through all CPUs. */
1427int evsel__disable_cpu(struct evsel *evsel, int cpu_map_idx)
1428{
1429 return perf_evsel__disable_cpu(&evsel->core, cpu_map_idx);
1430}
1431
1432int evsel__disable(struct evsel *evsel)
1433{
1434 int err = perf_evsel__disable(&evsel->core);
1435 /*
1436 * We mark it disabled here so that tools that disable a event can
1437 * ignore events after they disable it. I.e. the ring buffer may have
1438 * already a few more events queued up before the kernel got the stop
1439 * request.
1440 */
1441 if (!err)
1442 evsel->disabled = true;
1443
1444 return err;
1445}
1446
1447void free_config_terms(struct list_head *config_terms)
1448{
1449 struct evsel_config_term *term, *h;
1450
1451 list_for_each_entry_safe(term, h, config_terms, list) {
1452 list_del_init(&term->list);
1453 if (term->free_str)
1454 zfree(&term->val.str);
1455 free(term);
1456 }
1457}
1458
1459static void evsel__free_config_terms(struct evsel *evsel)
1460{
1461 free_config_terms(&evsel->config_terms);
1462}
1463
1464void evsel__exit(struct evsel *evsel)
1465{
1466 assert(list_empty(&evsel->core.node));
1467 assert(evsel->evlist == NULL);
1468 bpf_counter__destroy(evsel);
1469 perf_bpf_filter__destroy(evsel);
1470 evsel__free_counts(evsel);
1471 perf_evsel__free_fd(&evsel->core);
1472 perf_evsel__free_id(&evsel->core);
1473 evsel__free_config_terms(evsel);
1474 cgroup__put(evsel->cgrp);
1475 perf_cpu_map__put(evsel->core.cpus);
1476 perf_cpu_map__put(evsel->core.own_cpus);
1477 perf_thread_map__put(evsel->core.threads);
1478 zfree(&evsel->group_name);
1479 zfree(&evsel->name);
1480 zfree(&evsel->filter);
1481 zfree(&evsel->pmu_name);
1482 zfree(&evsel->group_pmu_name);
1483 zfree(&evsel->unit);
1484 zfree(&evsel->metric_id);
1485 evsel__zero_per_pkg(evsel);
1486 hashmap__free(evsel->per_pkg_mask);
1487 evsel->per_pkg_mask = NULL;
1488 zfree(&evsel->metric_events);
1489 perf_evsel__object.fini(evsel);
1490}
1491
1492void evsel__delete(struct evsel *evsel)
1493{
1494 if (!evsel)
1495 return;
1496
1497 evsel__exit(evsel);
1498 free(evsel);
1499}
1500
1501void evsel__compute_deltas(struct evsel *evsel, int cpu_map_idx, int thread,
1502 struct perf_counts_values *count)
1503{
1504 struct perf_counts_values tmp;
1505
1506 if (!evsel->prev_raw_counts)
1507 return;
1508
1509 tmp = *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread);
1510 *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread) = *count;
1511
1512 count->val = count->val - tmp.val;
1513 count->ena = count->ena - tmp.ena;
1514 count->run = count->run - tmp.run;
1515}
1516
1517static int evsel__read_one(struct evsel *evsel, int cpu_map_idx, int thread)
1518{
1519 struct perf_counts_values *count = perf_counts(evsel->counts, cpu_map_idx, thread);
1520
1521 return perf_evsel__read(&evsel->core, cpu_map_idx, thread, count);
1522}
1523
1524static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread,
1525 u64 val, u64 ena, u64 run, u64 lost)
1526{
1527 struct perf_counts_values *count;
1528
1529 count = perf_counts(counter->counts, cpu_map_idx, thread);
1530
1531 count->val = val;
1532 count->ena = ena;
1533 count->run = run;
1534 count->lost = lost;
1535
1536 perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true);
1537}
1538
1539static int evsel__process_group_data(struct evsel *leader, int cpu_map_idx, int thread, u64 *data)
1540{
1541 u64 read_format = leader->core.attr.read_format;
1542 struct sample_read_value *v;
1543 u64 nr, ena = 0, run = 0, lost = 0;
1544
1545 nr = *data++;
1546
1547 if (nr != (u64) leader->core.nr_members)
1548 return -EINVAL;
1549
1550 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1551 ena = *data++;
1552
1553 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1554 run = *data++;
1555
1556 v = (void *)data;
1557 sample_read_group__for_each(v, nr, read_format) {
1558 struct evsel *counter;
1559
1560 counter = evlist__id2evsel(leader->evlist, v->id);
1561 if (!counter)
1562 return -EINVAL;
1563
1564 if (read_format & PERF_FORMAT_LOST)
1565 lost = v->lost;
1566
1567 evsel__set_count(counter, cpu_map_idx, thread, v->value, ena, run, lost);
1568 }
1569
1570 return 0;
1571}
1572
1573static int evsel__read_group(struct evsel *leader, int cpu_map_idx, int thread)
1574{
1575 struct perf_stat_evsel *ps = leader->stats;
1576 u64 read_format = leader->core.attr.read_format;
1577 int size = perf_evsel__read_size(&leader->core);
1578 u64 *data = ps->group_data;
1579
1580 if (!(read_format & PERF_FORMAT_ID))
1581 return -EINVAL;
1582
1583 if (!evsel__is_group_leader(leader))
1584 return -EINVAL;
1585
1586 if (!data) {
1587 data = zalloc(size);
1588 if (!data)
1589 return -ENOMEM;
1590
1591 ps->group_data = data;
1592 }
1593
1594 if (FD(leader, cpu_map_idx, thread) < 0)
1595 return -EINVAL;
1596
1597 if (readn(FD(leader, cpu_map_idx, thread), data, size) <= 0)
1598 return -errno;
1599
1600 return evsel__process_group_data(leader, cpu_map_idx, thread, data);
1601}
1602
1603int evsel__read_counter(struct evsel *evsel, int cpu_map_idx, int thread)
1604{
1605 u64 read_format = evsel->core.attr.read_format;
1606
1607 if (read_format & PERF_FORMAT_GROUP)
1608 return evsel__read_group(evsel, cpu_map_idx, thread);
1609
1610 return evsel__read_one(evsel, cpu_map_idx, thread);
1611}
1612
1613int __evsel__read_on_cpu(struct evsel *evsel, int cpu_map_idx, int thread, bool scale)
1614{
1615 struct perf_counts_values count;
1616 size_t nv = scale ? 3 : 1;
1617
1618 if (FD(evsel, cpu_map_idx, thread) < 0)
1619 return -EINVAL;
1620
1621 if (evsel->counts == NULL && evsel__alloc_counts(evsel) < 0)
1622 return -ENOMEM;
1623
1624 if (readn(FD(evsel, cpu_map_idx, thread), &count, nv * sizeof(u64)) <= 0)
1625 return -errno;
1626
1627 evsel__compute_deltas(evsel, cpu_map_idx, thread, &count);
1628 perf_counts_values__scale(&count, scale, NULL);
1629 *perf_counts(evsel->counts, cpu_map_idx, thread) = count;
1630 return 0;
1631}
1632
1633static int evsel__match_other_cpu(struct evsel *evsel, struct evsel *other,
1634 int cpu_map_idx)
1635{
1636 struct perf_cpu cpu;
1637
1638 cpu = perf_cpu_map__cpu(evsel->core.cpus, cpu_map_idx);
1639 return perf_cpu_map__idx(other->core.cpus, cpu);
1640}
1641
1642static int evsel__hybrid_group_cpu_map_idx(struct evsel *evsel, int cpu_map_idx)
1643{
1644 struct evsel *leader = evsel__leader(evsel);
1645
1646 if ((evsel__is_hybrid(evsel) && !evsel__is_hybrid(leader)) ||
1647 (!evsel__is_hybrid(evsel) && evsel__is_hybrid(leader))) {
1648 return evsel__match_other_cpu(evsel, leader, cpu_map_idx);
1649 }
1650
1651 return cpu_map_idx;
1652}
1653
1654static int get_group_fd(struct evsel *evsel, int cpu_map_idx, int thread)
1655{
1656 struct evsel *leader = evsel__leader(evsel);
1657 int fd;
1658
1659 if (evsel__is_group_leader(evsel))
1660 return -1;
1661
1662 /*
1663 * Leader must be already processed/open,
1664 * if not it's a bug.
1665 */
1666 BUG_ON(!leader->core.fd);
1667
1668 cpu_map_idx = evsel__hybrid_group_cpu_map_idx(evsel, cpu_map_idx);
1669 if (cpu_map_idx == -1)
1670 return -1;
1671
1672 fd = FD(leader, cpu_map_idx, thread);
1673 BUG_ON(fd == -1 && !leader->skippable);
1674
1675 /*
1676 * When the leader has been skipped, return -2 to distinguish from no
1677 * group leader case.
1678 */
1679 return fd == -1 ? -2 : fd;
1680}
1681
1682static void evsel__remove_fd(struct evsel *pos, int nr_cpus, int nr_threads, int thread_idx)
1683{
1684 for (int cpu = 0; cpu < nr_cpus; cpu++)
1685 for (int thread = thread_idx; thread < nr_threads - 1; thread++)
1686 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
1687}
1688
1689static int update_fds(struct evsel *evsel,
1690 int nr_cpus, int cpu_map_idx,
1691 int nr_threads, int thread_idx)
1692{
1693 struct evsel *pos;
1694
1695 if (cpu_map_idx >= nr_cpus || thread_idx >= nr_threads)
1696 return -EINVAL;
1697
1698 evlist__for_each_entry(evsel->evlist, pos) {
1699 nr_cpus = pos != evsel ? nr_cpus : cpu_map_idx;
1700
1701 evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
1702
1703 /*
1704 * Since fds for next evsel has not been created,
1705 * there is no need to iterate whole event list.
1706 */
1707 if (pos == evsel)
1708 break;
1709 }
1710 return 0;
1711}
1712
1713static bool evsel__ignore_missing_thread(struct evsel *evsel,
1714 int nr_cpus, int cpu_map_idx,
1715 struct perf_thread_map *threads,
1716 int thread, int err)
1717{
1718 pid_t ignore_pid = perf_thread_map__pid(threads, thread);
1719
1720 if (!evsel->ignore_missing_thread)
1721 return false;
1722
1723 /* The system wide setup does not work with threads. */
1724 if (evsel->core.system_wide)
1725 return false;
1726
1727 /* The -ESRCH is perf event syscall errno for pid's not found. */
1728 if (err != -ESRCH)
1729 return false;
1730
1731 /* If there's only one thread, let it fail. */
1732 if (threads->nr == 1)
1733 return false;
1734
1735 /*
1736 * We should remove fd for missing_thread first
1737 * because thread_map__remove() will decrease threads->nr.
1738 */
1739 if (update_fds(evsel, nr_cpus, cpu_map_idx, threads->nr, thread))
1740 return false;
1741
1742 if (thread_map__remove(threads, thread))
1743 return false;
1744
1745 pr_warning("WARNING: Ignored open failure for pid %d\n",
1746 ignore_pid);
1747 return true;
1748}
1749
1750static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1751 void *priv __maybe_unused)
1752{
1753 return fprintf(fp, " %-32s %s\n", name, val);
1754}
1755
1756static void display_attr(struct perf_event_attr *attr)
1757{
1758 if (verbose >= 2 || debug_peo_args) {
1759 fprintf(stderr, "%.60s\n", graph_dotted_line);
1760 fprintf(stderr, "perf_event_attr:\n");
1761 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL);
1762 fprintf(stderr, "%.60s\n", graph_dotted_line);
1763 }
1764}
1765
1766bool evsel__precise_ip_fallback(struct evsel *evsel)
1767{
1768 /* Do not try less precise if not requested. */
1769 if (!evsel->precise_max)
1770 return false;
1771
1772 /*
1773 * We tried all the precise_ip values, and it's
1774 * still failing, so leave it to standard fallback.
1775 */
1776 if (!evsel->core.attr.precise_ip) {
1777 evsel->core.attr.precise_ip = evsel->precise_ip_original;
1778 return false;
1779 }
1780
1781 if (!evsel->precise_ip_original)
1782 evsel->precise_ip_original = evsel->core.attr.precise_ip;
1783
1784 evsel->core.attr.precise_ip--;
1785 pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip);
1786 display_attr(&evsel->core.attr);
1787 return true;
1788}
1789
1790static struct perf_cpu_map *empty_cpu_map;
1791static struct perf_thread_map *empty_thread_map;
1792
1793static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus,
1794 struct perf_thread_map *threads)
1795{
1796 int nthreads = perf_thread_map__nr(threads);
1797
1798 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) ||
1799 (perf_missing_features.aux_output && evsel->core.attr.aux_output))
1800 return -EINVAL;
1801
1802 if (cpus == NULL) {
1803 if (empty_cpu_map == NULL) {
1804 empty_cpu_map = perf_cpu_map__new_any_cpu();
1805 if (empty_cpu_map == NULL)
1806 return -ENOMEM;
1807 }
1808
1809 cpus = empty_cpu_map;
1810 }
1811
1812 if (threads == NULL) {
1813 if (empty_thread_map == NULL) {
1814 empty_thread_map = thread_map__new_by_tid(-1);
1815 if (empty_thread_map == NULL)
1816 return -ENOMEM;
1817 }
1818
1819 threads = empty_thread_map;
1820 }
1821
1822 if (evsel->core.fd == NULL &&
1823 perf_evsel__alloc_fd(&evsel->core, perf_cpu_map__nr(cpus), nthreads) < 0)
1824 return -ENOMEM;
1825
1826 evsel->open_flags = PERF_FLAG_FD_CLOEXEC;
1827 if (evsel->cgrp)
1828 evsel->open_flags |= PERF_FLAG_PID_CGROUP;
1829
1830 return 0;
1831}
1832
1833static void evsel__disable_missing_features(struct evsel *evsel)
1834{
1835 if (perf_missing_features.branch_counters)
1836 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_COUNTERS;
1837 if (perf_missing_features.read_lost)
1838 evsel->core.attr.read_format &= ~PERF_FORMAT_LOST;
1839 if (perf_missing_features.weight_struct) {
1840 evsel__set_sample_bit(evsel, WEIGHT);
1841 evsel__reset_sample_bit(evsel, WEIGHT_STRUCT);
1842 }
1843 if (perf_missing_features.clockid_wrong)
1844 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */
1845 if (perf_missing_features.clockid) {
1846 evsel->core.attr.use_clockid = 0;
1847 evsel->core.attr.clockid = 0;
1848 }
1849 if (perf_missing_features.cloexec)
1850 evsel->open_flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1851 if (perf_missing_features.mmap2)
1852 evsel->core.attr.mmap2 = 0;
1853 if (evsel->pmu && evsel->pmu->missing_features.exclude_guest)
1854 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0;
1855 if (perf_missing_features.lbr_flags)
1856 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1857 PERF_SAMPLE_BRANCH_NO_CYCLES);
1858 if (perf_missing_features.group_read && evsel->core.attr.inherit)
1859 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
1860 if (perf_missing_features.ksymbol)
1861 evsel->core.attr.ksymbol = 0;
1862 if (perf_missing_features.bpf)
1863 evsel->core.attr.bpf_event = 0;
1864 if (perf_missing_features.branch_hw_idx)
1865 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX;
1866 if (perf_missing_features.sample_id_all)
1867 evsel->core.attr.sample_id_all = 0;
1868}
1869
1870int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus,
1871 struct perf_thread_map *threads)
1872{
1873 int err;
1874
1875 err = __evsel__prepare_open(evsel, cpus, threads);
1876 if (err)
1877 return err;
1878
1879 evsel__disable_missing_features(evsel);
1880
1881 return err;
1882}
1883
1884bool evsel__detect_missing_features(struct evsel *evsel)
1885{
1886 /*
1887 * Must probe features in the order they were added to the
1888 * perf_event_attr interface.
1889 */
1890 if (!perf_missing_features.branch_counters &&
1891 (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS)) {
1892 perf_missing_features.branch_counters = true;
1893 pr_debug2("switching off branch counters support\n");
1894 return true;
1895 } else if (!perf_missing_features.read_lost &&
1896 (evsel->core.attr.read_format & PERF_FORMAT_LOST)) {
1897 perf_missing_features.read_lost = true;
1898 pr_debug2("switching off PERF_FORMAT_LOST support\n");
1899 return true;
1900 } else if (!perf_missing_features.weight_struct &&
1901 (evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT)) {
1902 perf_missing_features.weight_struct = true;
1903 pr_debug2("switching off weight struct support\n");
1904 return true;
1905 } else if (!perf_missing_features.code_page_size &&
1906 (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE)) {
1907 perf_missing_features.code_page_size = true;
1908 pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support, bailing out\n");
1909 return false;
1910 } else if (!perf_missing_features.data_page_size &&
1911 (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE)) {
1912 perf_missing_features.data_page_size = true;
1913 pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support, bailing out\n");
1914 return false;
1915 } else if (!perf_missing_features.cgroup && evsel->core.attr.cgroup) {
1916 perf_missing_features.cgroup = true;
1917 pr_debug2_peo("Kernel has no cgroup sampling support, bailing out\n");
1918 return false;
1919 } else if (!perf_missing_features.branch_hw_idx &&
1920 (evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX)) {
1921 perf_missing_features.branch_hw_idx = true;
1922 pr_debug2("switching off branch HW index support\n");
1923 return true;
1924 } else if (!perf_missing_features.aux_output && evsel->core.attr.aux_output) {
1925 perf_missing_features.aux_output = true;
1926 pr_debug2_peo("Kernel has no attr.aux_output support, bailing out\n");
1927 return false;
1928 } else if (!perf_missing_features.bpf && evsel->core.attr.bpf_event) {
1929 perf_missing_features.bpf = true;
1930 pr_debug2_peo("switching off bpf_event\n");
1931 return true;
1932 } else if (!perf_missing_features.ksymbol && evsel->core.attr.ksymbol) {
1933 perf_missing_features.ksymbol = true;
1934 pr_debug2_peo("switching off ksymbol\n");
1935 return true;
1936 } else if (!perf_missing_features.write_backward && evsel->core.attr.write_backward) {
1937 perf_missing_features.write_backward = true;
1938 pr_debug2_peo("switching off write_backward\n");
1939 return false;
1940 } else if (!perf_missing_features.clockid_wrong && evsel->core.attr.use_clockid) {
1941 perf_missing_features.clockid_wrong = true;
1942 pr_debug2_peo("switching off clockid\n");
1943 return true;
1944 } else if (!perf_missing_features.clockid && evsel->core.attr.use_clockid) {
1945 perf_missing_features.clockid = true;
1946 pr_debug2_peo("switching off use_clockid\n");
1947 return true;
1948 } else if (!perf_missing_features.cloexec && (evsel->open_flags & PERF_FLAG_FD_CLOEXEC)) {
1949 perf_missing_features.cloexec = true;
1950 pr_debug2_peo("switching off cloexec flag\n");
1951 return true;
1952 } else if (!perf_missing_features.mmap2 && evsel->core.attr.mmap2) {
1953 perf_missing_features.mmap2 = true;
1954 pr_debug2_peo("switching off mmap2\n");
1955 return true;
1956 } else if (evsel->core.attr.exclude_guest || evsel->core.attr.exclude_host) {
1957 if (evsel->pmu == NULL)
1958 evsel->pmu = evsel__find_pmu(evsel);
1959
1960 if (evsel->pmu)
1961 evsel->pmu->missing_features.exclude_guest = true;
1962 else {
1963 /* we cannot find PMU, disable attrs now */
1964 evsel->core.attr.exclude_host = false;
1965 evsel->core.attr.exclude_guest = false;
1966 }
1967
1968 if (evsel->exclude_GH) {
1969 pr_debug2_peo("PMU has no exclude_host/guest support, bailing out\n");
1970 return false;
1971 }
1972 if (!perf_missing_features.exclude_guest) {
1973 perf_missing_features.exclude_guest = true;
1974 pr_debug2_peo("switching off exclude_guest, exclude_host\n");
1975 }
1976 return true;
1977 } else if (!perf_missing_features.sample_id_all) {
1978 perf_missing_features.sample_id_all = true;
1979 pr_debug2_peo("switching off sample_id_all\n");
1980 return true;
1981 } else if (!perf_missing_features.lbr_flags &&
1982 (evsel->core.attr.branch_sample_type &
1983 (PERF_SAMPLE_BRANCH_NO_CYCLES |
1984 PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1985 perf_missing_features.lbr_flags = true;
1986 pr_debug2_peo("switching off branch sample type no (cycles/flags)\n");
1987 return true;
1988 } else if (!perf_missing_features.group_read &&
1989 evsel->core.attr.inherit &&
1990 (evsel->core.attr.read_format & PERF_FORMAT_GROUP) &&
1991 evsel__is_group_leader(evsel)) {
1992 perf_missing_features.group_read = true;
1993 pr_debug2_peo("switching off group read\n");
1994 return true;
1995 } else {
1996 return false;
1997 }
1998}
1999
2000static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
2001 struct perf_thread_map *threads,
2002 int start_cpu_map_idx, int end_cpu_map_idx)
2003{
2004 int idx, thread, nthreads;
2005 int pid = -1, err, old_errno;
2006 enum rlimit_action set_rlimit = NO_CHANGE;
2007
2008 err = __evsel__prepare_open(evsel, cpus, threads);
2009 if (err)
2010 return err;
2011
2012 if (cpus == NULL)
2013 cpus = empty_cpu_map;
2014
2015 if (threads == NULL)
2016 threads = empty_thread_map;
2017
2018 nthreads = perf_thread_map__nr(threads);
2019
2020 if (evsel->cgrp)
2021 pid = evsel->cgrp->fd;
2022
2023fallback_missing_features:
2024 evsel__disable_missing_features(evsel);
2025
2026 pr_debug3("Opening: %s\n", evsel__name(evsel));
2027 display_attr(&evsel->core.attr);
2028
2029 for (idx = start_cpu_map_idx; idx < end_cpu_map_idx; idx++) {
2030
2031 for (thread = 0; thread < nthreads; thread++) {
2032 int fd, group_fd;
2033retry_open:
2034 if (thread >= nthreads)
2035 break;
2036
2037 if (!evsel->cgrp && !evsel->core.system_wide)
2038 pid = perf_thread_map__pid(threads, thread);
2039
2040 group_fd = get_group_fd(evsel, idx, thread);
2041
2042 if (group_fd == -2) {
2043 pr_debug("broken group leader for %s\n", evsel->name);
2044 err = -EINVAL;
2045 goto out_close;
2046 }
2047
2048 test_attr__ready();
2049
2050 /* Debug message used by test scripts */
2051 pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx",
2052 pid, perf_cpu_map__cpu(cpus, idx).cpu, group_fd, evsel->open_flags);
2053
2054 fd = sys_perf_event_open(&evsel->core.attr, pid,
2055 perf_cpu_map__cpu(cpus, idx).cpu,
2056 group_fd, evsel->open_flags);
2057
2058 FD(evsel, idx, thread) = fd;
2059
2060 if (fd < 0) {
2061 err = -errno;
2062
2063 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n",
2064 err);
2065 goto try_fallback;
2066 }
2067
2068 bpf_counter__install_pe(evsel, idx, fd);
2069
2070 if (unlikely(test_attr__enabled)) {
2071 test_attr__open(&evsel->core.attr, pid,
2072 perf_cpu_map__cpu(cpus, idx),
2073 fd, group_fd, evsel->open_flags);
2074 }
2075
2076 /* Debug message used by test scripts */
2077 pr_debug2_peo(" = %d\n", fd);
2078
2079 if (evsel->bpf_fd >= 0) {
2080 int evt_fd = fd;
2081 int bpf_fd = evsel->bpf_fd;
2082
2083 err = ioctl(evt_fd,
2084 PERF_EVENT_IOC_SET_BPF,
2085 bpf_fd);
2086 if (err && errno != EEXIST) {
2087 pr_err("failed to attach bpf fd %d: %s\n",
2088 bpf_fd, strerror(errno));
2089 err = -EINVAL;
2090 goto out_close;
2091 }
2092 }
2093
2094 set_rlimit = NO_CHANGE;
2095
2096 /*
2097 * If we succeeded but had to kill clockid, fail and
2098 * have evsel__open_strerror() print us a nice error.
2099 */
2100 if (perf_missing_features.clockid ||
2101 perf_missing_features.clockid_wrong) {
2102 err = -EINVAL;
2103 goto out_close;
2104 }
2105 }
2106 }
2107
2108 return 0;
2109
2110try_fallback:
2111 if (evsel__precise_ip_fallback(evsel))
2112 goto retry_open;
2113
2114 if (evsel__ignore_missing_thread(evsel, perf_cpu_map__nr(cpus),
2115 idx, threads, thread, err)) {
2116 /* We just removed 1 thread, so lower the upper nthreads limit. */
2117 nthreads--;
2118
2119 /* ... and pretend like nothing have happened. */
2120 err = 0;
2121 goto retry_open;
2122 }
2123 /*
2124 * perf stat needs between 5 and 22 fds per CPU. When we run out
2125 * of them try to increase the limits.
2126 */
2127 if (err == -EMFILE && rlimit__increase_nofile(&set_rlimit))
2128 goto retry_open;
2129
2130 if (err != -EINVAL || idx > 0 || thread > 0)
2131 goto out_close;
2132
2133 if (evsel__detect_missing_features(evsel))
2134 goto fallback_missing_features;
2135out_close:
2136 if (err)
2137 threads->err_thread = thread;
2138
2139 old_errno = errno;
2140 do {
2141 while (--thread >= 0) {
2142 if (FD(evsel, idx, thread) >= 0)
2143 close(FD(evsel, idx, thread));
2144 FD(evsel, idx, thread) = -1;
2145 }
2146 thread = nthreads;
2147 } while (--idx >= 0);
2148 errno = old_errno;
2149 return err;
2150}
2151
2152int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus,
2153 struct perf_thread_map *threads)
2154{
2155 return evsel__open_cpu(evsel, cpus, threads, 0, perf_cpu_map__nr(cpus));
2156}
2157
2158void evsel__close(struct evsel *evsel)
2159{
2160 perf_evsel__close(&evsel->core);
2161 perf_evsel__free_id(&evsel->core);
2162}
2163
2164int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu_map_idx)
2165{
2166 if (cpu_map_idx == -1)
2167 return evsel__open_cpu(evsel, cpus, NULL, 0, perf_cpu_map__nr(cpus));
2168
2169 return evsel__open_cpu(evsel, cpus, NULL, cpu_map_idx, cpu_map_idx + 1);
2170}
2171
2172int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads)
2173{
2174 return evsel__open(evsel, NULL, threads);
2175}
2176
2177static int perf_evsel__parse_id_sample(const struct evsel *evsel,
2178 const union perf_event *event,
2179 struct perf_sample *sample)
2180{
2181 u64 type = evsel->core.attr.sample_type;
2182 const __u64 *array = event->sample.array;
2183 bool swapped = evsel->needs_swap;
2184 union u64_swap u;
2185
2186 array += ((event->header.size -
2187 sizeof(event->header)) / sizeof(u64)) - 1;
2188
2189 if (type & PERF_SAMPLE_IDENTIFIER) {
2190 sample->id = *array;
2191 array--;
2192 }
2193
2194 if (type & PERF_SAMPLE_CPU) {
2195 u.val64 = *array;
2196 if (swapped) {
2197 /* undo swap of u64, then swap on individual u32s */
2198 u.val64 = bswap_64(u.val64);
2199 u.val32[0] = bswap_32(u.val32[0]);
2200 }
2201
2202 sample->cpu = u.val32[0];
2203 array--;
2204 }
2205
2206 if (type & PERF_SAMPLE_STREAM_ID) {
2207 sample->stream_id = *array;
2208 array--;
2209 }
2210
2211 if (type & PERF_SAMPLE_ID) {
2212 sample->id = *array;
2213 array--;
2214 }
2215
2216 if (type & PERF_SAMPLE_TIME) {
2217 sample->time = *array;
2218 array--;
2219 }
2220
2221 if (type & PERF_SAMPLE_TID) {
2222 u.val64 = *array;
2223 if (swapped) {
2224 /* undo swap of u64, then swap on individual u32s */
2225 u.val64 = bswap_64(u.val64);
2226 u.val32[0] = bswap_32(u.val32[0]);
2227 u.val32[1] = bswap_32(u.val32[1]);
2228 }
2229
2230 sample->pid = u.val32[0];
2231 sample->tid = u.val32[1];
2232 array--;
2233 }
2234
2235 return 0;
2236}
2237
2238static inline bool overflow(const void *endp, u16 max_size, const void *offset,
2239 u64 size)
2240{
2241 return size > max_size || offset + size > endp;
2242}
2243
2244#define OVERFLOW_CHECK(offset, size, max_size) \
2245 do { \
2246 if (overflow(endp, (max_size), (offset), (size))) \
2247 return -EFAULT; \
2248 } while (0)
2249
2250#define OVERFLOW_CHECK_u64(offset) \
2251 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
2252
2253static int
2254perf_event__check_size(union perf_event *event, unsigned int sample_size)
2255{
2256 /*
2257 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
2258 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
2259 * check the format does not go past the end of the event.
2260 */
2261 if (sample_size + sizeof(event->header) > event->header.size)
2262 return -EFAULT;
2263
2264 return 0;
2265}
2266
2267void __weak arch_perf_parse_sample_weight(struct perf_sample *data,
2268 const __u64 *array,
2269 u64 type __maybe_unused)
2270{
2271 data->weight = *array;
2272}
2273
2274u64 evsel__bitfield_swap_branch_flags(u64 value)
2275{
2276 u64 new_val = 0;
2277
2278 /*
2279 * branch_flags
2280 * union {
2281 * u64 values;
2282 * struct {
2283 * mispred:1 //target mispredicted
2284 * predicted:1 //target predicted
2285 * in_tx:1 //in transaction
2286 * abort:1 //transaction abort
2287 * cycles:16 //cycle count to last branch
2288 * type:4 //branch type
2289 * spec:2 //branch speculation info
2290 * new_type:4 //additional branch type
2291 * priv:3 //privilege level
2292 * reserved:31
2293 * }
2294 * }
2295 *
2296 * Avoid bswap64() the entire branch_flag.value,
2297 * as it has variable bit-field sizes. Instead the
2298 * macro takes the bit-field position/size,
2299 * swaps it based on the host endianness.
2300 */
2301 if (host_is_bigendian()) {
2302 new_val = bitfield_swap(value, 0, 1);
2303 new_val |= bitfield_swap(value, 1, 1);
2304 new_val |= bitfield_swap(value, 2, 1);
2305 new_val |= bitfield_swap(value, 3, 1);
2306 new_val |= bitfield_swap(value, 4, 16);
2307 new_val |= bitfield_swap(value, 20, 4);
2308 new_val |= bitfield_swap(value, 24, 2);
2309 new_val |= bitfield_swap(value, 26, 4);
2310 new_val |= bitfield_swap(value, 30, 3);
2311 new_val |= bitfield_swap(value, 33, 31);
2312 } else {
2313 new_val = bitfield_swap(value, 63, 1);
2314 new_val |= bitfield_swap(value, 62, 1);
2315 new_val |= bitfield_swap(value, 61, 1);
2316 new_val |= bitfield_swap(value, 60, 1);
2317 new_val |= bitfield_swap(value, 44, 16);
2318 new_val |= bitfield_swap(value, 40, 4);
2319 new_val |= bitfield_swap(value, 38, 2);
2320 new_val |= bitfield_swap(value, 34, 4);
2321 new_val |= bitfield_swap(value, 31, 3);
2322 new_val |= bitfield_swap(value, 0, 31);
2323 }
2324
2325 return new_val;
2326}
2327
2328static inline bool evsel__has_branch_counters(const struct evsel *evsel)
2329{
2330 struct evsel *cur, *leader = evsel__leader(evsel);
2331
2332 /* The branch counters feature only supports group */
2333 if (!leader || !evsel->evlist)
2334 return false;
2335
2336 evlist__for_each_entry(evsel->evlist, cur) {
2337 if ((leader == evsel__leader(cur)) &&
2338 (cur->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS))
2339 return true;
2340 }
2341 return false;
2342}
2343
2344int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
2345 struct perf_sample *data)
2346{
2347 u64 type = evsel->core.attr.sample_type;
2348 bool swapped = evsel->needs_swap;
2349 const __u64 *array;
2350 u16 max_size = event->header.size;
2351 const void *endp = (void *)event + max_size;
2352 u64 sz;
2353
2354 /*
2355 * used for cross-endian analysis. See git commit 65014ab3
2356 * for why this goofiness is needed.
2357 */
2358 union u64_swap u;
2359
2360 memset(data, 0, sizeof(*data));
2361 data->cpu = data->pid = data->tid = -1;
2362 data->stream_id = data->id = data->time = -1ULL;
2363 data->period = evsel->core.attr.sample_period;
2364 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
2365 data->misc = event->header.misc;
2366 data->id = -1ULL;
2367 data->data_src = PERF_MEM_DATA_SRC_NONE;
2368 data->vcpu = -1;
2369
2370 if (event->header.type != PERF_RECORD_SAMPLE) {
2371 if (!evsel->core.attr.sample_id_all)
2372 return 0;
2373 return perf_evsel__parse_id_sample(evsel, event, data);
2374 }
2375
2376 array = event->sample.array;
2377
2378 if (perf_event__check_size(event, evsel->sample_size))
2379 return -EFAULT;
2380
2381 if (type & PERF_SAMPLE_IDENTIFIER) {
2382 data->id = *array;
2383 array++;
2384 }
2385
2386 if (type & PERF_SAMPLE_IP) {
2387 data->ip = *array;
2388 array++;
2389 }
2390
2391 if (type & PERF_SAMPLE_TID) {
2392 u.val64 = *array;
2393 if (swapped) {
2394 /* undo swap of u64, then swap on individual u32s */
2395 u.val64 = bswap_64(u.val64);
2396 u.val32[0] = bswap_32(u.val32[0]);
2397 u.val32[1] = bswap_32(u.val32[1]);
2398 }
2399
2400 data->pid = u.val32[0];
2401 data->tid = u.val32[1];
2402 array++;
2403 }
2404
2405 if (type & PERF_SAMPLE_TIME) {
2406 data->time = *array;
2407 array++;
2408 }
2409
2410 if (type & PERF_SAMPLE_ADDR) {
2411 data->addr = *array;
2412 array++;
2413 }
2414
2415 if (type & PERF_SAMPLE_ID) {
2416 data->id = *array;
2417 array++;
2418 }
2419
2420 if (type & PERF_SAMPLE_STREAM_ID) {
2421 data->stream_id = *array;
2422 array++;
2423 }
2424
2425 if (type & PERF_SAMPLE_CPU) {
2426
2427 u.val64 = *array;
2428 if (swapped) {
2429 /* undo swap of u64, then swap on individual u32s */
2430 u.val64 = bswap_64(u.val64);
2431 u.val32[0] = bswap_32(u.val32[0]);
2432 }
2433
2434 data->cpu = u.val32[0];
2435 array++;
2436 }
2437
2438 if (type & PERF_SAMPLE_PERIOD) {
2439 data->period = *array;
2440 array++;
2441 }
2442
2443 if (type & PERF_SAMPLE_READ) {
2444 u64 read_format = evsel->core.attr.read_format;
2445
2446 OVERFLOW_CHECK_u64(array);
2447 if (read_format & PERF_FORMAT_GROUP)
2448 data->read.group.nr = *array;
2449 else
2450 data->read.one.value = *array;
2451
2452 array++;
2453
2454 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2455 OVERFLOW_CHECK_u64(array);
2456 data->read.time_enabled = *array;
2457 array++;
2458 }
2459
2460 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2461 OVERFLOW_CHECK_u64(array);
2462 data->read.time_running = *array;
2463 array++;
2464 }
2465
2466 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2467 if (read_format & PERF_FORMAT_GROUP) {
2468 const u64 max_group_nr = UINT64_MAX /
2469 sizeof(struct sample_read_value);
2470
2471 if (data->read.group.nr > max_group_nr)
2472 return -EFAULT;
2473
2474 sz = data->read.group.nr * sample_read_value_size(read_format);
2475 OVERFLOW_CHECK(array, sz, max_size);
2476 data->read.group.values =
2477 (struct sample_read_value *)array;
2478 array = (void *)array + sz;
2479 } else {
2480 OVERFLOW_CHECK_u64(array);
2481 data->read.one.id = *array;
2482 array++;
2483
2484 if (read_format & PERF_FORMAT_LOST) {
2485 OVERFLOW_CHECK_u64(array);
2486 data->read.one.lost = *array;
2487 array++;
2488 }
2489 }
2490 }
2491
2492 if (type & PERF_SAMPLE_CALLCHAIN) {
2493 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
2494
2495 OVERFLOW_CHECK_u64(array);
2496 data->callchain = (struct ip_callchain *)array++;
2497 if (data->callchain->nr > max_callchain_nr)
2498 return -EFAULT;
2499 sz = data->callchain->nr * sizeof(u64);
2500 OVERFLOW_CHECK(array, sz, max_size);
2501 array = (void *)array + sz;
2502 }
2503
2504 if (type & PERF_SAMPLE_RAW) {
2505 OVERFLOW_CHECK_u64(array);
2506 u.val64 = *array;
2507
2508 /*
2509 * Undo swap of u64, then swap on individual u32s,
2510 * get the size of the raw area and undo all of the
2511 * swap. The pevent interface handles endianness by
2512 * itself.
2513 */
2514 if (swapped) {
2515 u.val64 = bswap_64(u.val64);
2516 u.val32[0] = bswap_32(u.val32[0]);
2517 u.val32[1] = bswap_32(u.val32[1]);
2518 }
2519 data->raw_size = u.val32[0];
2520
2521 /*
2522 * The raw data is aligned on 64bits including the
2523 * u32 size, so it's safe to use mem_bswap_64.
2524 */
2525 if (swapped)
2526 mem_bswap_64((void *) array, data->raw_size);
2527
2528 array = (void *)array + sizeof(u32);
2529
2530 OVERFLOW_CHECK(array, data->raw_size, max_size);
2531 data->raw_data = (void *)array;
2532 array = (void *)array + data->raw_size;
2533 }
2534
2535 if (type & PERF_SAMPLE_BRANCH_STACK) {
2536 const u64 max_branch_nr = UINT64_MAX /
2537 sizeof(struct branch_entry);
2538 struct branch_entry *e;
2539 unsigned int i;
2540
2541 OVERFLOW_CHECK_u64(array);
2542 data->branch_stack = (struct branch_stack *)array++;
2543
2544 if (data->branch_stack->nr > max_branch_nr)
2545 return -EFAULT;
2546
2547 sz = data->branch_stack->nr * sizeof(struct branch_entry);
2548 if (evsel__has_branch_hw_idx(evsel)) {
2549 sz += sizeof(u64);
2550 e = &data->branch_stack->entries[0];
2551 } else {
2552 data->no_hw_idx = true;
2553 /*
2554 * if the PERF_SAMPLE_BRANCH_HW_INDEX is not applied,
2555 * only nr and entries[] will be output by kernel.
2556 */
2557 e = (struct branch_entry *)&data->branch_stack->hw_idx;
2558 }
2559
2560 if (swapped) {
2561 /*
2562 * struct branch_flag does not have endian
2563 * specific bit field definition. And bswap
2564 * will not resolve the issue, since these
2565 * are bit fields.
2566 *
2567 * evsel__bitfield_swap_branch_flags() uses a
2568 * bitfield_swap macro to swap the bit position
2569 * based on the host endians.
2570 */
2571 for (i = 0; i < data->branch_stack->nr; i++, e++)
2572 e->flags.value = evsel__bitfield_swap_branch_flags(e->flags.value);
2573 }
2574
2575 OVERFLOW_CHECK(array, sz, max_size);
2576 array = (void *)array + sz;
2577
2578 if (evsel__has_branch_counters(evsel)) {
2579 OVERFLOW_CHECK_u64(array);
2580
2581 data->branch_stack_cntr = (u64 *)array;
2582 sz = data->branch_stack->nr * sizeof(u64);
2583
2584 OVERFLOW_CHECK(array, sz, max_size);
2585 array = (void *)array + sz;
2586 }
2587 }
2588
2589 if (type & PERF_SAMPLE_REGS_USER) {
2590 OVERFLOW_CHECK_u64(array);
2591 data->user_regs.abi = *array;
2592 array++;
2593
2594 if (data->user_regs.abi) {
2595 u64 mask = evsel->core.attr.sample_regs_user;
2596
2597 sz = hweight64(mask) * sizeof(u64);
2598 OVERFLOW_CHECK(array, sz, max_size);
2599 data->user_regs.mask = mask;
2600 data->user_regs.regs = (u64 *)array;
2601 array = (void *)array + sz;
2602 }
2603 }
2604
2605 if (type & PERF_SAMPLE_STACK_USER) {
2606 OVERFLOW_CHECK_u64(array);
2607 sz = *array++;
2608
2609 data->user_stack.offset = ((char *)(array - 1)
2610 - (char *) event);
2611
2612 if (!sz) {
2613 data->user_stack.size = 0;
2614 } else {
2615 OVERFLOW_CHECK(array, sz, max_size);
2616 data->user_stack.data = (char *)array;
2617 array = (void *)array + sz;
2618 OVERFLOW_CHECK_u64(array);
2619 data->user_stack.size = *array++;
2620 if (WARN_ONCE(data->user_stack.size > sz,
2621 "user stack dump failure\n"))
2622 return -EFAULT;
2623 }
2624 }
2625
2626 if (type & PERF_SAMPLE_WEIGHT_TYPE) {
2627 OVERFLOW_CHECK_u64(array);
2628 arch_perf_parse_sample_weight(data, array, type);
2629 array++;
2630 }
2631
2632 if (type & PERF_SAMPLE_DATA_SRC) {
2633 OVERFLOW_CHECK_u64(array);
2634 data->data_src = *array;
2635 array++;
2636 }
2637
2638 if (type & PERF_SAMPLE_TRANSACTION) {
2639 OVERFLOW_CHECK_u64(array);
2640 data->transaction = *array;
2641 array++;
2642 }
2643
2644 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
2645 if (type & PERF_SAMPLE_REGS_INTR) {
2646 OVERFLOW_CHECK_u64(array);
2647 data->intr_regs.abi = *array;
2648 array++;
2649
2650 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
2651 u64 mask = evsel->core.attr.sample_regs_intr;
2652
2653 sz = hweight64(mask) * sizeof(u64);
2654 OVERFLOW_CHECK(array, sz, max_size);
2655 data->intr_regs.mask = mask;
2656 data->intr_regs.regs = (u64 *)array;
2657 array = (void *)array + sz;
2658 }
2659 }
2660
2661 data->phys_addr = 0;
2662 if (type & PERF_SAMPLE_PHYS_ADDR) {
2663 data->phys_addr = *array;
2664 array++;
2665 }
2666
2667 data->cgroup = 0;
2668 if (type & PERF_SAMPLE_CGROUP) {
2669 data->cgroup = *array;
2670 array++;
2671 }
2672
2673 data->data_page_size = 0;
2674 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
2675 data->data_page_size = *array;
2676 array++;
2677 }
2678
2679 data->code_page_size = 0;
2680 if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
2681 data->code_page_size = *array;
2682 array++;
2683 }
2684
2685 if (type & PERF_SAMPLE_AUX) {
2686 OVERFLOW_CHECK_u64(array);
2687 sz = *array++;
2688
2689 OVERFLOW_CHECK(array, sz, max_size);
2690 /* Undo swap of data */
2691 if (swapped)
2692 mem_bswap_64((char *)array, sz);
2693 data->aux_sample.size = sz;
2694 data->aux_sample.data = (char *)array;
2695 array = (void *)array + sz;
2696 }
2697
2698 return 0;
2699}
2700
2701int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event,
2702 u64 *timestamp)
2703{
2704 u64 type = evsel->core.attr.sample_type;
2705 const __u64 *array;
2706
2707 if (!(type & PERF_SAMPLE_TIME))
2708 return -1;
2709
2710 if (event->header.type != PERF_RECORD_SAMPLE) {
2711 struct perf_sample data = {
2712 .time = -1ULL,
2713 };
2714
2715 if (!evsel->core.attr.sample_id_all)
2716 return -1;
2717 if (perf_evsel__parse_id_sample(evsel, event, &data))
2718 return -1;
2719
2720 *timestamp = data.time;
2721 return 0;
2722 }
2723
2724 array = event->sample.array;
2725
2726 if (perf_event__check_size(event, evsel->sample_size))
2727 return -EFAULT;
2728
2729 if (type & PERF_SAMPLE_IDENTIFIER)
2730 array++;
2731
2732 if (type & PERF_SAMPLE_IP)
2733 array++;
2734
2735 if (type & PERF_SAMPLE_TID)
2736 array++;
2737
2738 if (type & PERF_SAMPLE_TIME)
2739 *timestamp = *array;
2740
2741 return 0;
2742}
2743
2744u16 evsel__id_hdr_size(struct evsel *evsel)
2745{
2746 u64 sample_type = evsel->core.attr.sample_type;
2747 u16 size = 0;
2748
2749 if (sample_type & PERF_SAMPLE_TID)
2750 size += sizeof(u64);
2751
2752 if (sample_type & PERF_SAMPLE_TIME)
2753 size += sizeof(u64);
2754
2755 if (sample_type & PERF_SAMPLE_ID)
2756 size += sizeof(u64);
2757
2758 if (sample_type & PERF_SAMPLE_STREAM_ID)
2759 size += sizeof(u64);
2760
2761 if (sample_type & PERF_SAMPLE_CPU)
2762 size += sizeof(u64);
2763
2764 if (sample_type & PERF_SAMPLE_IDENTIFIER)
2765 size += sizeof(u64);
2766
2767 return size;
2768}
2769
2770#ifdef HAVE_LIBTRACEEVENT
2771struct tep_format_field *evsel__field(struct evsel *evsel, const char *name)
2772{
2773 return tep_find_field(evsel->tp_format, name);
2774}
2775
2776struct tep_format_field *evsel__common_field(struct evsel *evsel, const char *name)
2777{
2778 return tep_find_common_field(evsel->tp_format, name);
2779}
2780
2781void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char *name)
2782{
2783 struct tep_format_field *field = evsel__field(evsel, name);
2784 int offset;
2785
2786 if (!field)
2787 return NULL;
2788
2789 offset = field->offset;
2790
2791 if (field->flags & TEP_FIELD_IS_DYNAMIC) {
2792 offset = *(int *)(sample->raw_data + field->offset);
2793 offset &= 0xffff;
2794 if (tep_field_is_relative(field->flags))
2795 offset += field->offset + field->size;
2796 }
2797
2798 return sample->raw_data + offset;
2799}
2800
2801u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample,
2802 bool needs_swap)
2803{
2804 u64 value;
2805 void *ptr = sample->raw_data + field->offset;
2806
2807 switch (field->size) {
2808 case 1:
2809 return *(u8 *)ptr;
2810 case 2:
2811 value = *(u16 *)ptr;
2812 break;
2813 case 4:
2814 value = *(u32 *)ptr;
2815 break;
2816 case 8:
2817 memcpy(&value, ptr, sizeof(u64));
2818 break;
2819 default:
2820 return 0;
2821 }
2822
2823 if (!needs_swap)
2824 return value;
2825
2826 switch (field->size) {
2827 case 2:
2828 return bswap_16(value);
2829 case 4:
2830 return bswap_32(value);
2831 case 8:
2832 return bswap_64(value);
2833 default:
2834 return 0;
2835 }
2836
2837 return 0;
2838}
2839
2840u64 evsel__intval(struct evsel *evsel, struct perf_sample *sample, const char *name)
2841{
2842 struct tep_format_field *field = evsel__field(evsel, name);
2843
2844 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2845}
2846
2847u64 evsel__intval_common(struct evsel *evsel, struct perf_sample *sample, const char *name)
2848{
2849 struct tep_format_field *field = evsel__common_field(evsel, name);
2850
2851 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2852}
2853
2854#endif
2855
2856bool evsel__fallback(struct evsel *evsel, struct target *target, int err,
2857 char *msg, size_t msgsize)
2858{
2859 int paranoid;
2860
2861 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2862 evsel->core.attr.type == PERF_TYPE_HARDWARE &&
2863 evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2864 /*
2865 * If it's cycles then fall back to hrtimer based cpu-clock sw
2866 * counter, which is always available even if no PMU support.
2867 *
2868 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2869 * b0a873e).
2870 */
2871 evsel->core.attr.type = PERF_TYPE_SOFTWARE;
2872 evsel->core.attr.config = target__has_cpu(target)
2873 ? PERF_COUNT_SW_CPU_CLOCK
2874 : PERF_COUNT_SW_TASK_CLOCK;
2875 scnprintf(msg, msgsize,
2876 "The cycles event is not supported, trying to fall back to %s",
2877 target__has_cpu(target) ? "cpu-clock" : "task-clock");
2878
2879 zfree(&evsel->name);
2880 return true;
2881 } else if (err == EACCES && !evsel->core.attr.exclude_kernel &&
2882 (paranoid = perf_event_paranoid()) > 1) {
2883 const char *name = evsel__name(evsel);
2884 char *new_name;
2885 const char *sep = ":";
2886
2887 /* If event has exclude user then don't exclude kernel. */
2888 if (evsel->core.attr.exclude_user)
2889 return false;
2890
2891 /* Is there already the separator in the name. */
2892 if (strchr(name, '/') ||
2893 (strchr(name, ':') && !evsel->is_libpfm_event))
2894 sep = "";
2895
2896 if (asprintf(&new_name, "%s%su", name, sep) < 0)
2897 return false;
2898
2899 free(evsel->name);
2900 evsel->name = new_name;
2901 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying "
2902 "to fall back to excluding kernel and hypervisor "
2903 " samples", paranoid);
2904 evsel->core.attr.exclude_kernel = 1;
2905 evsel->core.attr.exclude_hv = 1;
2906
2907 return true;
2908 }
2909
2910 return false;
2911}
2912
2913static bool find_process(const char *name)
2914{
2915 size_t len = strlen(name);
2916 DIR *dir;
2917 struct dirent *d;
2918 int ret = -1;
2919
2920 dir = opendir(procfs__mountpoint());
2921 if (!dir)
2922 return false;
2923
2924 /* Walk through the directory. */
2925 while (ret && (d = readdir(dir)) != NULL) {
2926 char path[PATH_MAX];
2927 char *data;
2928 size_t size;
2929
2930 if ((d->d_type != DT_DIR) ||
2931 !strcmp(".", d->d_name) ||
2932 !strcmp("..", d->d_name))
2933 continue;
2934
2935 scnprintf(path, sizeof(path), "%s/%s/comm",
2936 procfs__mountpoint(), d->d_name);
2937
2938 if (filename__read_str(path, &data, &size))
2939 continue;
2940
2941 ret = strncmp(name, data, len);
2942 free(data);
2943 }
2944
2945 closedir(dir);
2946 return ret ? false : true;
2947}
2948
2949int __weak arch_evsel__open_strerror(struct evsel *evsel __maybe_unused,
2950 char *msg __maybe_unused,
2951 size_t size __maybe_unused)
2952{
2953 return 0;
2954}
2955
2956int evsel__open_strerror(struct evsel *evsel, struct target *target,
2957 int err, char *msg, size_t size)
2958{
2959 char sbuf[STRERR_BUFSIZE];
2960 int printed = 0, enforced = 0;
2961 int ret;
2962
2963 switch (err) {
2964 case EPERM:
2965 case EACCES:
2966 printed += scnprintf(msg + printed, size - printed,
2967 "Access to performance monitoring and observability operations is limited.\n");
2968
2969 if (!sysfs__read_int("fs/selinux/enforce", &enforced)) {
2970 if (enforced) {
2971 printed += scnprintf(msg + printed, size - printed,
2972 "Enforced MAC policy settings (SELinux) can limit access to performance\n"
2973 "monitoring and observability operations. Inspect system audit records for\n"
2974 "more perf_event access control information and adjusting the policy.\n");
2975 }
2976 }
2977
2978 if (err == EPERM)
2979 printed += scnprintf(msg, size,
2980 "No permission to enable %s event.\n\n", evsel__name(evsel));
2981
2982 return scnprintf(msg + printed, size - printed,
2983 "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n"
2984 "access to performance monitoring and observability operations for processes\n"
2985 "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n"
2986 "More information can be found at 'Perf events and tool security' document:\n"
2987 "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n"
2988 "perf_event_paranoid setting is %d:\n"
2989 " -1: Allow use of (almost) all events by all users\n"
2990 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
2991 ">= 0: Disallow raw and ftrace function tracepoint access\n"
2992 ">= 1: Disallow CPU event access\n"
2993 ">= 2: Disallow kernel profiling\n"
2994 "To make the adjusted perf_event_paranoid setting permanent preserve it\n"
2995 "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = <setting>)",
2996 perf_event_paranoid());
2997 case ENOENT:
2998 return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel));
2999 case EMFILE:
3000 return scnprintf(msg, size, "%s",
3001 "Too many events are opened.\n"
3002 "Probably the maximum number of open file descriptors has been reached.\n"
3003 "Hint: Try again after reducing the number of events.\n"
3004 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
3005 case ENOMEM:
3006 if (evsel__has_callchain(evsel) &&
3007 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
3008 return scnprintf(msg, size,
3009 "Not enough memory to setup event with callchain.\n"
3010 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
3011 "Hint: Current value: %d", sysctl__max_stack());
3012 break;
3013 case ENODEV:
3014 if (target->cpu_list)
3015 return scnprintf(msg, size, "%s",
3016 "No such device - did you specify an out-of-range profile CPU?");
3017 break;
3018 case EOPNOTSUPP:
3019 if (evsel->core.attr.sample_type & PERF_SAMPLE_BRANCH_STACK)
3020 return scnprintf(msg, size,
3021 "%s: PMU Hardware or event type doesn't support branch stack sampling.",
3022 evsel__name(evsel));
3023 if (evsel->core.attr.aux_output)
3024 return scnprintf(msg, size,
3025 "%s: PMU Hardware doesn't support 'aux_output' feature",
3026 evsel__name(evsel));
3027 if (evsel->core.attr.sample_period != 0)
3028 return scnprintf(msg, size,
3029 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
3030 evsel__name(evsel));
3031 if (evsel->core.attr.precise_ip)
3032 return scnprintf(msg, size, "%s",
3033 "\'precise\' request may not be supported. Try removing 'p' modifier.");
3034#if defined(__i386__) || defined(__x86_64__)
3035 if (evsel->core.attr.type == PERF_TYPE_HARDWARE)
3036 return scnprintf(msg, size, "%s",
3037 "No hardware sampling interrupt available.\n");
3038#endif
3039 break;
3040 case EBUSY:
3041 if (find_process("oprofiled"))
3042 return scnprintf(msg, size,
3043 "The PMU counters are busy/taken by another profiler.\n"
3044 "We found oprofile daemon running, please stop it and try again.");
3045 break;
3046 case EINVAL:
3047 if (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE && perf_missing_features.code_page_size)
3048 return scnprintf(msg, size, "Asking for the code page size isn't supported by this kernel.");
3049 if (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE && perf_missing_features.data_page_size)
3050 return scnprintf(msg, size, "Asking for the data page size isn't supported by this kernel.");
3051 if (evsel->core.attr.write_backward && perf_missing_features.write_backward)
3052 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
3053 if (perf_missing_features.clockid)
3054 return scnprintf(msg, size, "clockid feature not supported.");
3055 if (perf_missing_features.clockid_wrong)
3056 return scnprintf(msg, size, "wrong clockid (%d).", clockid);
3057 if (perf_missing_features.aux_output)
3058 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel.");
3059 if (!target__has_cpu(target))
3060 return scnprintf(msg, size,
3061 "Invalid event (%s) in per-thread mode, enable system wide with '-a'.",
3062 evsel__name(evsel));
3063
3064 break;
3065 case ENODATA:
3066 return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. "
3067 "Please add an auxiliary event in front of the load latency event.");
3068 default:
3069 break;
3070 }
3071
3072 ret = arch_evsel__open_strerror(evsel, msg, size);
3073 if (ret)
3074 return ret;
3075
3076 return scnprintf(msg, size,
3077 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
3078 "/bin/dmesg | grep -i perf may provide additional information.\n",
3079 err, str_error_r(err, sbuf, sizeof(sbuf)), evsel__name(evsel));
3080}
3081
3082struct perf_env *evsel__env(struct evsel *evsel)
3083{
3084 if (evsel && evsel->evlist && evsel->evlist->env)
3085 return evsel->evlist->env;
3086 return &perf_env;
3087}
3088
3089static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist)
3090{
3091 int cpu_map_idx, thread;
3092
3093 for (cpu_map_idx = 0; cpu_map_idx < xyarray__max_x(evsel->core.fd); cpu_map_idx++) {
3094 for (thread = 0; thread < xyarray__max_y(evsel->core.fd);
3095 thread++) {
3096 int fd = FD(evsel, cpu_map_idx, thread);
3097
3098 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core,
3099 cpu_map_idx, thread, fd) < 0)
3100 return -1;
3101 }
3102 }
3103
3104 return 0;
3105}
3106
3107int evsel__store_ids(struct evsel *evsel, struct evlist *evlist)
3108{
3109 struct perf_cpu_map *cpus = evsel->core.cpus;
3110 struct perf_thread_map *threads = evsel->core.threads;
3111
3112 if (perf_evsel__alloc_id(&evsel->core, perf_cpu_map__nr(cpus), threads->nr))
3113 return -ENOMEM;
3114
3115 return store_evsel_ids(evsel, evlist);
3116}
3117
3118void evsel__zero_per_pkg(struct evsel *evsel)
3119{
3120 struct hashmap_entry *cur;
3121 size_t bkt;
3122
3123 if (evsel->per_pkg_mask) {
3124 hashmap__for_each_entry(evsel->per_pkg_mask, cur, bkt)
3125 zfree(&cur->pkey);
3126
3127 hashmap__clear(evsel->per_pkg_mask);
3128 }
3129}
3130
3131/**
3132 * evsel__is_hybrid - does the evsel have a known PMU that is hybrid. Note, this
3133 * will be false on hybrid systems for hardware and legacy
3134 * cache events.
3135 */
3136bool evsel__is_hybrid(const struct evsel *evsel)
3137{
3138 if (perf_pmus__num_core_pmus() == 1)
3139 return false;
3140
3141 return evsel->core.is_pmu_core;
3142}
3143
3144struct evsel *evsel__leader(const struct evsel *evsel)
3145{
3146 return container_of(evsel->core.leader, struct evsel, core);
3147}
3148
3149bool evsel__has_leader(struct evsel *evsel, struct evsel *leader)
3150{
3151 return evsel->core.leader == &leader->core;
3152}
3153
3154bool evsel__is_leader(struct evsel *evsel)
3155{
3156 return evsel__has_leader(evsel, evsel);
3157}
3158
3159void evsel__set_leader(struct evsel *evsel, struct evsel *leader)
3160{
3161 evsel->core.leader = &leader->core;
3162}
3163
3164int evsel__source_count(const struct evsel *evsel)
3165{
3166 struct evsel *pos;
3167 int count = 0;
3168
3169 evlist__for_each_entry(evsel->evlist, pos) {
3170 if (pos->metric_leader == evsel)
3171 count++;
3172 }
3173 return count;
3174}
3175
3176bool __weak arch_evsel__must_be_in_group(const struct evsel *evsel __maybe_unused)
3177{
3178 return false;
3179}
3180
3181/*
3182 * Remove an event from a given group (leader).
3183 * Some events, e.g., perf metrics Topdown events,
3184 * must always be grouped. Ignore the events.
3185 */
3186void evsel__remove_from_group(struct evsel *evsel, struct evsel *leader)
3187{
3188 if (!arch_evsel__must_be_in_group(evsel) && evsel != leader) {
3189 evsel__set_leader(evsel, evsel);
3190 evsel->core.nr_members = 0;
3191 leader->core.nr_members--;
3192 }
3193}