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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 * Powerpc needs __SANE_USERSPACE_TYPES__ before <linux/types.h> to select
10 * 'int-ll64.h' and avoid compile warnings when printing __u64 with %llu.
11 */
12#define __SANE_USERSPACE_TYPES__
13
14#include <byteswap.h>
15#include <errno.h>
16#include <inttypes.h>
17#include <linux/bitops.h>
18#include <api/fs/fs.h>
19#include <api/fs/tracing_path.h>
20#include <linux/hw_breakpoint.h>
21#include <linux/perf_event.h>
22#include <linux/compiler.h>
23#include <linux/err.h>
24#include <linux/zalloc.h>
25#include <sys/ioctl.h>
26#include <sys/resource.h>
27#include <sys/syscall.h>
28#include <sys/types.h>
29#include <dirent.h>
30#include <stdlib.h>
31#include <perf/evsel.h>
32#include "asm/bug.h"
33#include "bpf_counter.h"
34#include "callchain.h"
35#include "cgroup.h"
36#include "counts.h"
37#include "event.h"
38#include "evsel.h"
39#include "time-utils.h"
40#include "util/env.h"
41#include "util/evsel_config.h"
42#include "util/evsel_fprintf.h"
43#include "evlist.h"
44#include <perf/cpumap.h>
45#include "thread_map.h"
46#include "target.h"
47#include "perf_regs.h"
48#include "record.h"
49#include "debug.h"
50#include "trace-event.h"
51#include "stat.h"
52#include "string2.h"
53#include "memswap.h"
54#include "util.h"
55#include "util/hashmap.h"
56#include "off_cpu.h"
57#include "pmu.h"
58#include "pmus.h"
59#include "hwmon_pmu.h"
60#include "tool_pmu.h"
61#include "rlimit.h"
62#include "../perf-sys.h"
63#include "util/parse-branch-options.h"
64#include "util/bpf-filter.h"
65#include "util/hist.h"
66#include <internal/xyarray.h>
67#include <internal/lib.h>
68#include <internal/threadmap.h>
69#include "util/intel-tpebs.h"
70
71#include <linux/ctype.h>
72
73#ifdef HAVE_LIBTRACEEVENT
74#include <event-parse.h>
75#endif
76
77struct perf_missing_features perf_missing_features;
78
79static clockid_t clockid;
80
81static int evsel__no_extra_init(struct evsel *evsel __maybe_unused)
82{
83 return 0;
84}
85
86static bool test_attr__enabled(void)
87{
88 static bool test_attr__enabled;
89 static bool test_attr__enabled_tested;
90
91 if (!test_attr__enabled_tested) {
92 char *dir = getenv("PERF_TEST_ATTR");
93
94 test_attr__enabled = (dir != NULL);
95 test_attr__enabled_tested = true;
96 }
97 return test_attr__enabled;
98}
99
100#define __WRITE_ASS(str, fmt, data) \
101do { \
102 if (fprintf(file, #str "=%"fmt "\n", data) < 0) { \
103 perror("test attr - failed to write event file"); \
104 fclose(file); \
105 return -1; \
106 } \
107} while (0)
108
109#define WRITE_ASS(field, fmt) __WRITE_ASS(field, fmt, attr->field)
110
111static int store_event(struct perf_event_attr *attr, pid_t pid, struct perf_cpu cpu,
112 int fd, int group_fd, unsigned long flags)
113{
114 FILE *file;
115 char path[PATH_MAX];
116 char *dir = getenv("PERF_TEST_ATTR");
117
118 snprintf(path, PATH_MAX, "%s/event-%d-%llu-%d", dir,
119 attr->type, attr->config, fd);
120
121 file = fopen(path, "w+");
122 if (!file) {
123 perror("test attr - failed to open event file");
124 return -1;
125 }
126
127 if (fprintf(file, "[event-%d-%llu-%d]\n",
128 attr->type, attr->config, fd) < 0) {
129 perror("test attr - failed to write event file");
130 fclose(file);
131 return -1;
132 }
133
134 /* syscall arguments */
135 __WRITE_ASS(fd, "d", fd);
136 __WRITE_ASS(group_fd, "d", group_fd);
137 __WRITE_ASS(cpu, "d", cpu.cpu);
138 __WRITE_ASS(pid, "d", pid);
139 __WRITE_ASS(flags, "lu", flags);
140
141 /* struct perf_event_attr */
142 WRITE_ASS(type, PRIu32);
143 WRITE_ASS(size, PRIu32);
144 WRITE_ASS(config, "llu");
145 WRITE_ASS(sample_period, "llu");
146 WRITE_ASS(sample_type, "llu");
147 WRITE_ASS(read_format, "llu");
148 WRITE_ASS(disabled, "d");
149 WRITE_ASS(inherit, "d");
150 WRITE_ASS(pinned, "d");
151 WRITE_ASS(exclusive, "d");
152 WRITE_ASS(exclude_user, "d");
153 WRITE_ASS(exclude_kernel, "d");
154 WRITE_ASS(exclude_hv, "d");
155 WRITE_ASS(exclude_idle, "d");
156 WRITE_ASS(mmap, "d");
157 WRITE_ASS(comm, "d");
158 WRITE_ASS(freq, "d");
159 WRITE_ASS(inherit_stat, "d");
160 WRITE_ASS(enable_on_exec, "d");
161 WRITE_ASS(task, "d");
162 WRITE_ASS(watermark, "d");
163 WRITE_ASS(precise_ip, "d");
164 WRITE_ASS(mmap_data, "d");
165 WRITE_ASS(sample_id_all, "d");
166 WRITE_ASS(exclude_host, "d");
167 WRITE_ASS(exclude_guest, "d");
168 WRITE_ASS(exclude_callchain_kernel, "d");
169 WRITE_ASS(exclude_callchain_user, "d");
170 WRITE_ASS(mmap2, "d");
171 WRITE_ASS(comm_exec, "d");
172 WRITE_ASS(context_switch, "d");
173 WRITE_ASS(write_backward, "d");
174 WRITE_ASS(namespaces, "d");
175 WRITE_ASS(use_clockid, "d");
176 WRITE_ASS(wakeup_events, PRIu32);
177 WRITE_ASS(bp_type, PRIu32);
178 WRITE_ASS(config1, "llu");
179 WRITE_ASS(config2, "llu");
180 WRITE_ASS(branch_sample_type, "llu");
181 WRITE_ASS(sample_regs_user, "llu");
182 WRITE_ASS(sample_stack_user, PRIu32);
183
184 fclose(file);
185 return 0;
186}
187
188#undef __WRITE_ASS
189#undef WRITE_ASS
190
191static void test_attr__open(struct perf_event_attr *attr, pid_t pid, struct perf_cpu cpu,
192 int fd, int group_fd, unsigned long flags)
193{
194 int errno_saved = errno;
195
196 if ((fd != -1) && store_event(attr, pid, cpu, fd, group_fd, flags)) {
197 pr_err("test attr FAILED");
198 exit(128);
199 }
200
201 errno = errno_saved;
202}
203
204static void evsel__no_extra_fini(struct evsel *evsel __maybe_unused)
205{
206}
207
208static struct {
209 size_t size;
210 int (*init)(struct evsel *evsel);
211 void (*fini)(struct evsel *evsel);
212} perf_evsel__object = {
213 .size = sizeof(struct evsel),
214 .init = evsel__no_extra_init,
215 .fini = evsel__no_extra_fini,
216};
217
218int evsel__object_config(size_t object_size, int (*init)(struct evsel *evsel),
219 void (*fini)(struct evsel *evsel))
220{
221
222 if (object_size == 0)
223 goto set_methods;
224
225 if (perf_evsel__object.size > object_size)
226 return -EINVAL;
227
228 perf_evsel__object.size = object_size;
229
230set_methods:
231 if (init != NULL)
232 perf_evsel__object.init = init;
233
234 if (fini != NULL)
235 perf_evsel__object.fini = fini;
236
237 return 0;
238}
239
240#define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
241
242int __evsel__sample_size(u64 sample_type)
243{
244 u64 mask = sample_type & PERF_SAMPLE_MASK;
245 int size = 0;
246 int i;
247
248 for (i = 0; i < 64; i++) {
249 if (mask & (1ULL << i))
250 size++;
251 }
252
253 size *= sizeof(u64);
254
255 return size;
256}
257
258/**
259 * __perf_evsel__calc_id_pos - calculate id_pos.
260 * @sample_type: sample type
261 *
262 * This function returns the position of the event id (PERF_SAMPLE_ID or
263 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
264 * perf_record_sample.
265 */
266static int __perf_evsel__calc_id_pos(u64 sample_type)
267{
268 int idx = 0;
269
270 if (sample_type & PERF_SAMPLE_IDENTIFIER)
271 return 0;
272
273 if (!(sample_type & PERF_SAMPLE_ID))
274 return -1;
275
276 if (sample_type & PERF_SAMPLE_IP)
277 idx += 1;
278
279 if (sample_type & PERF_SAMPLE_TID)
280 idx += 1;
281
282 if (sample_type & PERF_SAMPLE_TIME)
283 idx += 1;
284
285 if (sample_type & PERF_SAMPLE_ADDR)
286 idx += 1;
287
288 return idx;
289}
290
291/**
292 * __perf_evsel__calc_is_pos - calculate is_pos.
293 * @sample_type: sample type
294 *
295 * This function returns the position (counting backwards) of the event id
296 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
297 * sample_id_all is used there is an id sample appended to non-sample events.
298 */
299static int __perf_evsel__calc_is_pos(u64 sample_type)
300{
301 int idx = 1;
302
303 if (sample_type & PERF_SAMPLE_IDENTIFIER)
304 return 1;
305
306 if (!(sample_type & PERF_SAMPLE_ID))
307 return -1;
308
309 if (sample_type & PERF_SAMPLE_CPU)
310 idx += 1;
311
312 if (sample_type & PERF_SAMPLE_STREAM_ID)
313 idx += 1;
314
315 return idx;
316}
317
318void evsel__calc_id_pos(struct evsel *evsel)
319{
320 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->core.attr.sample_type);
321 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->core.attr.sample_type);
322}
323
324void __evsel__set_sample_bit(struct evsel *evsel,
325 enum perf_event_sample_format bit)
326{
327 if (!(evsel->core.attr.sample_type & bit)) {
328 evsel->core.attr.sample_type |= bit;
329 evsel->sample_size += sizeof(u64);
330 evsel__calc_id_pos(evsel);
331 }
332}
333
334void __evsel__reset_sample_bit(struct evsel *evsel,
335 enum perf_event_sample_format bit)
336{
337 if (evsel->core.attr.sample_type & bit) {
338 evsel->core.attr.sample_type &= ~bit;
339 evsel->sample_size -= sizeof(u64);
340 evsel__calc_id_pos(evsel);
341 }
342}
343
344void evsel__set_sample_id(struct evsel *evsel,
345 bool can_sample_identifier)
346{
347 if (can_sample_identifier) {
348 evsel__reset_sample_bit(evsel, ID);
349 evsel__set_sample_bit(evsel, IDENTIFIER);
350 } else {
351 evsel__set_sample_bit(evsel, ID);
352 }
353 evsel->core.attr.read_format |= PERF_FORMAT_ID;
354}
355
356/**
357 * evsel__is_function_event - Return whether given evsel is a function
358 * trace event
359 *
360 * @evsel - evsel selector to be tested
361 *
362 * Return %true if event is function trace event
363 */
364bool evsel__is_function_event(struct evsel *evsel)
365{
366#define FUNCTION_EVENT "ftrace:function"
367
368 return evsel->name &&
369 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
370
371#undef FUNCTION_EVENT
372}
373
374void evsel__init(struct evsel *evsel,
375 struct perf_event_attr *attr, int idx)
376{
377 perf_evsel__init(&evsel->core, attr, idx);
378 evsel->tracking = !idx;
379 evsel->unit = strdup("");
380 evsel->scale = 1.0;
381 evsel->max_events = ULONG_MAX;
382 evsel->evlist = NULL;
383 evsel->bpf_obj = NULL;
384 evsel->bpf_fd = -1;
385 INIT_LIST_HEAD(&evsel->config_terms);
386 INIT_LIST_HEAD(&evsel->bpf_counter_list);
387 INIT_LIST_HEAD(&evsel->bpf_filters);
388 perf_evsel__object.init(evsel);
389 evsel->sample_size = __evsel__sample_size(attr->sample_type);
390 evsel__calc_id_pos(evsel);
391 evsel->cmdline_group_boundary = false;
392 evsel->metric_events = NULL;
393 evsel->per_pkg_mask = NULL;
394 evsel->collect_stat = false;
395 evsel->group_pmu_name = NULL;
396 evsel->skippable = false;
397 evsel->alternate_hw_config = PERF_COUNT_HW_MAX;
398}
399
400struct evsel *evsel__new_idx(struct perf_event_attr *attr, int idx)
401{
402 struct evsel *evsel = zalloc(perf_evsel__object.size);
403
404 if (!evsel)
405 return NULL;
406 evsel__init(evsel, attr, idx);
407
408 if (evsel__is_bpf_output(evsel) && !attr->sample_type) {
409 evsel->core.attr.sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
410 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
411 evsel->core.attr.sample_period = 1;
412 }
413
414 if (evsel__is_clock(evsel)) {
415 free((char *)evsel->unit);
416 evsel->unit = strdup("msec");
417 evsel->scale = 1e-6;
418 }
419
420 return evsel;
421}
422
423int copy_config_terms(struct list_head *dst, struct list_head *src)
424{
425 struct evsel_config_term *pos, *tmp;
426
427 list_for_each_entry(pos, src, list) {
428 tmp = malloc(sizeof(*tmp));
429 if (tmp == NULL)
430 return -ENOMEM;
431
432 *tmp = *pos;
433 if (tmp->free_str) {
434 tmp->val.str = strdup(pos->val.str);
435 if (tmp->val.str == NULL) {
436 free(tmp);
437 return -ENOMEM;
438 }
439 }
440 list_add_tail(&tmp->list, dst);
441 }
442 return 0;
443}
444
445static int evsel__copy_config_terms(struct evsel *dst, struct evsel *src)
446{
447 return copy_config_terms(&dst->config_terms, &src->config_terms);
448}
449
450/**
451 * evsel__clone - create a new evsel copied from @orig
452 * @orig: original evsel
453 *
454 * The assumption is that @orig is not configured nor opened yet.
455 * So we only care about the attributes that can be set while it's parsed.
456 */
457struct evsel *evsel__clone(struct evsel *orig)
458{
459 struct evsel *evsel;
460
461 BUG_ON(orig->core.fd);
462 BUG_ON(orig->counts);
463 BUG_ON(orig->priv);
464 BUG_ON(orig->per_pkg_mask);
465
466 /* cannot handle BPF objects for now */
467 if (orig->bpf_obj)
468 return NULL;
469
470 evsel = evsel__new(&orig->core.attr);
471 if (evsel == NULL)
472 return NULL;
473
474 evsel->core.cpus = perf_cpu_map__get(orig->core.cpus);
475 evsel->core.own_cpus = perf_cpu_map__get(orig->core.own_cpus);
476 evsel->core.threads = perf_thread_map__get(orig->core.threads);
477 evsel->core.nr_members = orig->core.nr_members;
478 evsel->core.system_wide = orig->core.system_wide;
479 evsel->core.requires_cpu = orig->core.requires_cpu;
480 evsel->core.is_pmu_core = orig->core.is_pmu_core;
481
482 if (orig->name) {
483 evsel->name = strdup(orig->name);
484 if (evsel->name == NULL)
485 goto out_err;
486 }
487 if (orig->group_name) {
488 evsel->group_name = strdup(orig->group_name);
489 if (evsel->group_name == NULL)
490 goto out_err;
491 }
492 if (orig->group_pmu_name) {
493 evsel->group_pmu_name = strdup(orig->group_pmu_name);
494 if (evsel->group_pmu_name == NULL)
495 goto out_err;
496 }
497 if (orig->filter) {
498 evsel->filter = strdup(orig->filter);
499 if (evsel->filter == NULL)
500 goto out_err;
501 }
502 if (orig->metric_id) {
503 evsel->metric_id = strdup(orig->metric_id);
504 if (evsel->metric_id == NULL)
505 goto out_err;
506 }
507 evsel->cgrp = cgroup__get(orig->cgrp);
508#ifdef HAVE_LIBTRACEEVENT
509 evsel->tp_format = orig->tp_format;
510#endif
511 evsel->handler = orig->handler;
512 evsel->core.leader = orig->core.leader;
513
514 evsel->max_events = orig->max_events;
515 free((char *)evsel->unit);
516 evsel->unit = strdup(orig->unit);
517 if (evsel->unit == NULL)
518 goto out_err;
519
520 evsel->scale = orig->scale;
521 evsel->snapshot = orig->snapshot;
522 evsel->per_pkg = orig->per_pkg;
523 evsel->percore = orig->percore;
524 evsel->precise_max = orig->precise_max;
525 evsel->is_libpfm_event = orig->is_libpfm_event;
526
527 evsel->exclude_GH = orig->exclude_GH;
528 evsel->sample_read = orig->sample_read;
529 evsel->auto_merge_stats = orig->auto_merge_stats;
530 evsel->collect_stat = orig->collect_stat;
531 evsel->weak_group = orig->weak_group;
532 evsel->use_config_name = orig->use_config_name;
533 evsel->pmu = orig->pmu;
534
535 if (evsel__copy_config_terms(evsel, orig) < 0)
536 goto out_err;
537
538 evsel->alternate_hw_config = orig->alternate_hw_config;
539
540 return evsel;
541
542out_err:
543 evsel__delete(evsel);
544 return NULL;
545}
546
547/*
548 * Returns pointer with encoded error via <linux/err.h> interface.
549 */
550#ifdef HAVE_LIBTRACEEVENT
551struct evsel *evsel__newtp_idx(const char *sys, const char *name, int idx, bool format)
552{
553 struct evsel *evsel = zalloc(perf_evsel__object.size);
554 int err = -ENOMEM;
555
556 if (evsel == NULL) {
557 goto out_err;
558 } else {
559 struct perf_event_attr attr = {
560 .type = PERF_TYPE_TRACEPOINT,
561 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
562 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
563 };
564
565 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
566 goto out_free;
567
568 event_attr_init(&attr);
569
570 if (format) {
571 evsel->tp_format = trace_event__tp_format(sys, name);
572 if (IS_ERR(evsel->tp_format)) {
573 err = PTR_ERR(evsel->tp_format);
574 goto out_free;
575 }
576 attr.config = evsel->tp_format->id;
577 } else {
578 attr.config = (__u64) -1;
579 }
580
581
582 attr.sample_period = 1;
583 evsel__init(evsel, &attr, idx);
584 }
585
586 return evsel;
587
588out_free:
589 zfree(&evsel->name);
590 free(evsel);
591out_err:
592 return ERR_PTR(err);
593}
594#endif
595
596const char *const evsel__hw_names[PERF_COUNT_HW_MAX] = {
597 "cycles",
598 "instructions",
599 "cache-references",
600 "cache-misses",
601 "branches",
602 "branch-misses",
603 "bus-cycles",
604 "stalled-cycles-frontend",
605 "stalled-cycles-backend",
606 "ref-cycles",
607};
608
609char *evsel__bpf_counter_events;
610
611bool evsel__match_bpf_counter_events(const char *name)
612{
613 int name_len;
614 bool match;
615 char *ptr;
616
617 if (!evsel__bpf_counter_events)
618 return false;
619
620 ptr = strstr(evsel__bpf_counter_events, name);
621 name_len = strlen(name);
622
623 /* check name matches a full token in evsel__bpf_counter_events */
624 match = (ptr != NULL) &&
625 ((ptr == evsel__bpf_counter_events) || (*(ptr - 1) == ',')) &&
626 ((*(ptr + name_len) == ',') || (*(ptr + name_len) == '\0'));
627
628 return match;
629}
630
631static const char *__evsel__hw_name(u64 config)
632{
633 if (config < PERF_COUNT_HW_MAX && evsel__hw_names[config])
634 return evsel__hw_names[config];
635
636 return "unknown-hardware";
637}
638
639static int evsel__add_modifiers(struct evsel *evsel, char *bf, size_t size)
640{
641 int colon = 0, r = 0;
642 struct perf_event_attr *attr = &evsel->core.attr;
643
644#define MOD_PRINT(context, mod) do { \
645 if (!attr->exclude_##context) { \
646 if (!colon) colon = ++r; \
647 r += scnprintf(bf + r, size - r, "%c", mod); \
648 } } while(0)
649
650 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
651 MOD_PRINT(kernel, 'k');
652 MOD_PRINT(user, 'u');
653 MOD_PRINT(hv, 'h');
654 }
655
656 if (attr->precise_ip) {
657 if (!colon)
658 colon = ++r;
659 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
660 }
661
662 if (attr->exclude_host || attr->exclude_guest) {
663 MOD_PRINT(host, 'H');
664 MOD_PRINT(guest, 'G');
665 }
666#undef MOD_PRINT
667 if (colon)
668 bf[colon - 1] = ':';
669 return r;
670}
671
672int __weak arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
673{
674 return scnprintf(bf, size, "%s", __evsel__hw_name(evsel->core.attr.config));
675}
676
677static int evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
678{
679 int r = arch_evsel__hw_name(evsel, bf, size);
680 return r + evsel__add_modifiers(evsel, bf + r, size - r);
681}
682
683const char *const evsel__sw_names[PERF_COUNT_SW_MAX] = {
684 "cpu-clock",
685 "task-clock",
686 "page-faults",
687 "context-switches",
688 "cpu-migrations",
689 "minor-faults",
690 "major-faults",
691 "alignment-faults",
692 "emulation-faults",
693 "dummy",
694};
695
696static const char *__evsel__sw_name(u64 config)
697{
698 if (config < PERF_COUNT_SW_MAX && evsel__sw_names[config])
699 return evsel__sw_names[config];
700 return "unknown-software";
701}
702
703static int evsel__sw_name(struct evsel *evsel, char *bf, size_t size)
704{
705 int r = scnprintf(bf, size, "%s", __evsel__sw_name(evsel->core.attr.config));
706 return r + evsel__add_modifiers(evsel, bf + r, size - r);
707}
708
709static int __evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
710{
711 int r;
712
713 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
714
715 if (type & HW_BREAKPOINT_R)
716 r += scnprintf(bf + r, size - r, "r");
717
718 if (type & HW_BREAKPOINT_W)
719 r += scnprintf(bf + r, size - r, "w");
720
721 if (type & HW_BREAKPOINT_X)
722 r += scnprintf(bf + r, size - r, "x");
723
724 return r;
725}
726
727static int evsel__bp_name(struct evsel *evsel, char *bf, size_t size)
728{
729 struct perf_event_attr *attr = &evsel->core.attr;
730 int r = __evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
731 return r + evsel__add_modifiers(evsel, bf + r, size - r);
732}
733
734const char *const evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX][EVSEL__MAX_ALIASES] = {
735 { "L1-dcache", "l1-d", "l1d", "L1-data", },
736 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
737 { "LLC", "L2", },
738 { "dTLB", "d-tlb", "Data-TLB", },
739 { "iTLB", "i-tlb", "Instruction-TLB", },
740 { "branch", "branches", "bpu", "btb", "bpc", },
741 { "node", },
742};
743
744const char *const evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX][EVSEL__MAX_ALIASES] = {
745 { "load", "loads", "read", },
746 { "store", "stores", "write", },
747 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
748};
749
750const char *const evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX][EVSEL__MAX_ALIASES] = {
751 { "refs", "Reference", "ops", "access", },
752 { "misses", "miss", },
753};
754
755#define C(x) PERF_COUNT_HW_CACHE_##x
756#define CACHE_READ (1 << C(OP_READ))
757#define CACHE_WRITE (1 << C(OP_WRITE))
758#define CACHE_PREFETCH (1 << C(OP_PREFETCH))
759#define COP(x) (1 << x)
760
761/*
762 * cache operation stat
763 * L1I : Read and prefetch only
764 * ITLB and BPU : Read-only
765 */
766static const unsigned long evsel__hw_cache_stat[C(MAX)] = {
767 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
768 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
769 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
770 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
771 [C(ITLB)] = (CACHE_READ),
772 [C(BPU)] = (CACHE_READ),
773 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
774};
775
776bool evsel__is_cache_op_valid(u8 type, u8 op)
777{
778 if (evsel__hw_cache_stat[type] & COP(op))
779 return true; /* valid */
780 else
781 return false; /* invalid */
782}
783
784int __evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result, char *bf, size_t size)
785{
786 if (result) {
787 return scnprintf(bf, size, "%s-%s-%s", evsel__hw_cache[type][0],
788 evsel__hw_cache_op[op][0],
789 evsel__hw_cache_result[result][0]);
790 }
791
792 return scnprintf(bf, size, "%s-%s", evsel__hw_cache[type][0],
793 evsel__hw_cache_op[op][1]);
794}
795
796static int __evsel__hw_cache_name(u64 config, char *bf, size_t size)
797{
798 u8 op, result, type = (config >> 0) & 0xff;
799 const char *err = "unknown-ext-hardware-cache-type";
800
801 if (type >= PERF_COUNT_HW_CACHE_MAX)
802 goto out_err;
803
804 op = (config >> 8) & 0xff;
805 err = "unknown-ext-hardware-cache-op";
806 if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
807 goto out_err;
808
809 result = (config >> 16) & 0xff;
810 err = "unknown-ext-hardware-cache-result";
811 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
812 goto out_err;
813
814 err = "invalid-cache";
815 if (!evsel__is_cache_op_valid(type, op))
816 goto out_err;
817
818 return __evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
819out_err:
820 return scnprintf(bf, size, "%s", err);
821}
822
823static int evsel__hw_cache_name(struct evsel *evsel, char *bf, size_t size)
824{
825 int ret = __evsel__hw_cache_name(evsel->core.attr.config, bf, size);
826 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret);
827}
828
829static int evsel__raw_name(struct evsel *evsel, char *bf, size_t size)
830{
831 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->core.attr.config);
832 return ret + evsel__add_modifiers(evsel, bf + ret, size - ret);
833}
834
835const char *evsel__name(struct evsel *evsel)
836{
837 char bf[128];
838
839 if (!evsel)
840 goto out_unknown;
841
842 if (evsel->name)
843 return evsel->name;
844
845 switch (evsel->core.attr.type) {
846 case PERF_TYPE_RAW:
847 evsel__raw_name(evsel, bf, sizeof(bf));
848 break;
849
850 case PERF_TYPE_HARDWARE:
851 evsel__hw_name(evsel, bf, sizeof(bf));
852 break;
853
854 case PERF_TYPE_HW_CACHE:
855 evsel__hw_cache_name(evsel, bf, sizeof(bf));
856 break;
857
858 case PERF_TYPE_SOFTWARE:
859 evsel__sw_name(evsel, bf, sizeof(bf));
860 break;
861
862 case PERF_TYPE_TRACEPOINT:
863 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
864 break;
865
866 case PERF_TYPE_BREAKPOINT:
867 evsel__bp_name(evsel, bf, sizeof(bf));
868 break;
869
870 case PERF_PMU_TYPE_TOOL:
871 scnprintf(bf, sizeof(bf), "%s", evsel__tool_pmu_event_name(evsel));
872 break;
873
874 default:
875 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
876 evsel->core.attr.type);
877 break;
878 }
879
880 evsel->name = strdup(bf);
881
882 if (evsel->name)
883 return evsel->name;
884out_unknown:
885 return "unknown";
886}
887
888bool evsel__name_is(struct evsel *evsel, const char *name)
889{
890 return !strcmp(evsel__name(evsel), name);
891}
892
893const char *evsel__metric_id(const struct evsel *evsel)
894{
895 if (evsel->metric_id)
896 return evsel->metric_id;
897
898 if (evsel__is_tool(evsel))
899 return evsel__tool_pmu_event_name(evsel);
900
901 return "unknown";
902}
903
904const char *evsel__group_name(struct evsel *evsel)
905{
906 return evsel->group_name ?: "anon group";
907}
908
909/*
910 * Returns the group details for the specified leader,
911 * with following rules.
912 *
913 * For record -e '{cycles,instructions}'
914 * 'anon group { cycles:u, instructions:u }'
915 *
916 * For record -e 'cycles,instructions' and report --group
917 * 'cycles:u, instructions:u'
918 */
919int evsel__group_desc(struct evsel *evsel, char *buf, size_t size)
920{
921 int ret = 0;
922 bool first = true;
923 struct evsel *pos;
924 const char *group_name = evsel__group_name(evsel);
925
926 if (!evsel->forced_leader)
927 ret = scnprintf(buf, size, "%s { ", group_name);
928
929 for_each_group_evsel(pos, evsel) {
930 if (symbol_conf.skip_empty &&
931 evsel__hists(pos)->stats.nr_samples == 0)
932 continue;
933
934 ret += scnprintf(buf + ret, size - ret, "%s%s",
935 first ? "" : ", ", evsel__name(pos));
936 first = false;
937 }
938
939 if (!evsel->forced_leader)
940 ret += scnprintf(buf + ret, size - ret, " }");
941
942 return ret;
943}
944
945static void __evsel__config_callchain(struct evsel *evsel, struct record_opts *opts,
946 struct callchain_param *param)
947{
948 bool function = evsel__is_function_event(evsel);
949 struct perf_event_attr *attr = &evsel->core.attr;
950
951 evsel__set_sample_bit(evsel, CALLCHAIN);
952
953 attr->sample_max_stack = param->max_stack;
954
955 if (opts->kernel_callchains)
956 attr->exclude_callchain_user = 1;
957 if (opts->user_callchains)
958 attr->exclude_callchain_kernel = 1;
959 if (param->record_mode == CALLCHAIN_LBR) {
960 if (!opts->branch_stack) {
961 if (attr->exclude_user) {
962 pr_warning("LBR callstack option is only available "
963 "to get user callchain information. "
964 "Falling back to framepointers.\n");
965 } else {
966 evsel__set_sample_bit(evsel, BRANCH_STACK);
967 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
968 PERF_SAMPLE_BRANCH_CALL_STACK |
969 PERF_SAMPLE_BRANCH_NO_CYCLES |
970 PERF_SAMPLE_BRANCH_NO_FLAGS |
971 PERF_SAMPLE_BRANCH_HW_INDEX;
972 }
973 } else
974 pr_warning("Cannot use LBR callstack with branch stack. "
975 "Falling back to framepointers.\n");
976 }
977
978 if (param->record_mode == CALLCHAIN_DWARF) {
979 if (!function) {
980 const char *arch = perf_env__arch(evsel__env(evsel));
981
982 evsel__set_sample_bit(evsel, REGS_USER);
983 evsel__set_sample_bit(evsel, STACK_USER);
984 if (opts->sample_user_regs &&
985 DWARF_MINIMAL_REGS(arch) != arch__user_reg_mask()) {
986 attr->sample_regs_user |= DWARF_MINIMAL_REGS(arch);
987 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, "
988 "specifying a subset with --user-regs may render DWARF unwinding unreliable, "
989 "so the minimal registers set (IP, SP) is explicitly forced.\n");
990 } else {
991 attr->sample_regs_user |= arch__user_reg_mask();
992 }
993 attr->sample_stack_user = param->dump_size;
994 attr->exclude_callchain_user = 1;
995 } else {
996 pr_info("Cannot use DWARF unwind for function trace event,"
997 " falling back to framepointers.\n");
998 }
999 }
1000
1001 if (function) {
1002 pr_info("Disabling user space callchains for function trace event.\n");
1003 attr->exclude_callchain_user = 1;
1004 }
1005}
1006
1007void evsel__config_callchain(struct evsel *evsel, struct record_opts *opts,
1008 struct callchain_param *param)
1009{
1010 if (param->enabled)
1011 return __evsel__config_callchain(evsel, opts, param);
1012}
1013
1014static void evsel__reset_callgraph(struct evsel *evsel, struct callchain_param *param)
1015{
1016 struct perf_event_attr *attr = &evsel->core.attr;
1017
1018 evsel__reset_sample_bit(evsel, CALLCHAIN);
1019 if (param->record_mode == CALLCHAIN_LBR) {
1020 evsel__reset_sample_bit(evsel, BRANCH_STACK);
1021 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
1022 PERF_SAMPLE_BRANCH_CALL_STACK |
1023 PERF_SAMPLE_BRANCH_HW_INDEX);
1024 }
1025 if (param->record_mode == CALLCHAIN_DWARF) {
1026 evsel__reset_sample_bit(evsel, REGS_USER);
1027 evsel__reset_sample_bit(evsel, STACK_USER);
1028 }
1029}
1030
1031static void evsel__apply_config_terms(struct evsel *evsel,
1032 struct record_opts *opts, bool track)
1033{
1034 struct evsel_config_term *term;
1035 struct list_head *config_terms = &evsel->config_terms;
1036 struct perf_event_attr *attr = &evsel->core.attr;
1037 /* callgraph default */
1038 struct callchain_param param = {
1039 .record_mode = callchain_param.record_mode,
1040 };
1041 u32 dump_size = 0;
1042 int max_stack = 0;
1043 const char *callgraph_buf = NULL;
1044
1045 list_for_each_entry(term, config_terms, list) {
1046 switch (term->type) {
1047 case EVSEL__CONFIG_TERM_PERIOD:
1048 if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
1049 attr->sample_period = term->val.period;
1050 attr->freq = 0;
1051 evsel__reset_sample_bit(evsel, PERIOD);
1052 }
1053 break;
1054 case EVSEL__CONFIG_TERM_FREQ:
1055 if (!(term->weak && opts->user_freq != UINT_MAX)) {
1056 attr->sample_freq = term->val.freq;
1057 attr->freq = 1;
1058 evsel__set_sample_bit(evsel, PERIOD);
1059 }
1060 break;
1061 case EVSEL__CONFIG_TERM_TIME:
1062 if (term->val.time)
1063 evsel__set_sample_bit(evsel, TIME);
1064 else
1065 evsel__reset_sample_bit(evsel, TIME);
1066 break;
1067 case EVSEL__CONFIG_TERM_CALLGRAPH:
1068 callgraph_buf = term->val.str;
1069 break;
1070 case EVSEL__CONFIG_TERM_BRANCH:
1071 if (term->val.str && strcmp(term->val.str, "no")) {
1072 evsel__set_sample_bit(evsel, BRANCH_STACK);
1073 parse_branch_str(term->val.str,
1074 &attr->branch_sample_type);
1075 } else
1076 evsel__reset_sample_bit(evsel, BRANCH_STACK);
1077 break;
1078 case EVSEL__CONFIG_TERM_STACK_USER:
1079 dump_size = term->val.stack_user;
1080 break;
1081 case EVSEL__CONFIG_TERM_MAX_STACK:
1082 max_stack = term->val.max_stack;
1083 break;
1084 case EVSEL__CONFIG_TERM_MAX_EVENTS:
1085 evsel->max_events = term->val.max_events;
1086 break;
1087 case EVSEL__CONFIG_TERM_INHERIT:
1088 /*
1089 * attr->inherit should has already been set by
1090 * evsel__config. If user explicitly set
1091 * inherit using config terms, override global
1092 * opt->no_inherit setting.
1093 */
1094 attr->inherit = term->val.inherit ? 1 : 0;
1095 break;
1096 case EVSEL__CONFIG_TERM_OVERWRITE:
1097 attr->write_backward = term->val.overwrite ? 1 : 0;
1098 break;
1099 case EVSEL__CONFIG_TERM_DRV_CFG:
1100 break;
1101 case EVSEL__CONFIG_TERM_PERCORE:
1102 break;
1103 case EVSEL__CONFIG_TERM_AUX_OUTPUT:
1104 attr->aux_output = term->val.aux_output ? 1 : 0;
1105 break;
1106 case EVSEL__CONFIG_TERM_AUX_SAMPLE_SIZE:
1107 /* Already applied by auxtrace */
1108 break;
1109 case EVSEL__CONFIG_TERM_CFG_CHG:
1110 break;
1111 default:
1112 break;
1113 }
1114 }
1115
1116 /* User explicitly set per-event callgraph, clear the old setting and reset. */
1117 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
1118 bool sample_address = false;
1119
1120 if (max_stack) {
1121 param.max_stack = max_stack;
1122 if (callgraph_buf == NULL)
1123 callgraph_buf = "fp";
1124 }
1125
1126 /* parse callgraph parameters */
1127 if (callgraph_buf != NULL) {
1128 if (!strcmp(callgraph_buf, "no")) {
1129 param.enabled = false;
1130 param.record_mode = CALLCHAIN_NONE;
1131 } else {
1132 param.enabled = true;
1133 if (parse_callchain_record(callgraph_buf, ¶m)) {
1134 pr_err("per-event callgraph setting for %s failed. "
1135 "Apply callgraph global setting for it\n",
1136 evsel->name);
1137 return;
1138 }
1139 if (param.record_mode == CALLCHAIN_DWARF)
1140 sample_address = true;
1141 }
1142 }
1143 if (dump_size > 0) {
1144 dump_size = round_up(dump_size, sizeof(u64));
1145 param.dump_size = dump_size;
1146 }
1147
1148 /* If global callgraph set, clear it */
1149 if (callchain_param.enabled)
1150 evsel__reset_callgraph(evsel, &callchain_param);
1151
1152 /* set perf-event callgraph */
1153 if (param.enabled) {
1154 if (sample_address) {
1155 evsel__set_sample_bit(evsel, ADDR);
1156 evsel__set_sample_bit(evsel, DATA_SRC);
1157 evsel->core.attr.mmap_data = track;
1158 }
1159 evsel__config_callchain(evsel, opts, ¶m);
1160 }
1161 }
1162}
1163
1164struct evsel_config_term *__evsel__get_config_term(struct evsel *evsel, enum evsel_term_type type)
1165{
1166 struct evsel_config_term *term, *found_term = NULL;
1167
1168 list_for_each_entry(term, &evsel->config_terms, list) {
1169 if (term->type == type)
1170 found_term = term;
1171 }
1172
1173 return found_term;
1174}
1175
1176void __weak arch_evsel__set_sample_weight(struct evsel *evsel)
1177{
1178 evsel__set_sample_bit(evsel, WEIGHT);
1179}
1180
1181void __weak arch__post_evsel_config(struct evsel *evsel __maybe_unused,
1182 struct perf_event_attr *attr __maybe_unused)
1183{
1184}
1185
1186static void evsel__set_default_freq_period(struct record_opts *opts,
1187 struct perf_event_attr *attr)
1188{
1189 if (opts->freq) {
1190 attr->freq = 1;
1191 attr->sample_freq = opts->freq;
1192 } else {
1193 attr->sample_period = opts->default_interval;
1194 }
1195}
1196
1197static bool evsel__is_offcpu_event(struct evsel *evsel)
1198{
1199 return evsel__is_bpf_output(evsel) && evsel__name_is(evsel, OFFCPU_EVENT);
1200}
1201
1202/*
1203 * The enable_on_exec/disabled value strategy:
1204 *
1205 * 1) For any type of traced program:
1206 * - all independent events and group leaders are disabled
1207 * - all group members are enabled
1208 *
1209 * Group members are ruled by group leaders. They need to
1210 * be enabled, because the group scheduling relies on that.
1211 *
1212 * 2) For traced programs executed by perf:
1213 * - all independent events and group leaders have
1214 * enable_on_exec set
1215 * - we don't specifically enable or disable any event during
1216 * the record command
1217 *
1218 * Independent events and group leaders are initially disabled
1219 * and get enabled by exec. Group members are ruled by group
1220 * leaders as stated in 1).
1221 *
1222 * 3) For traced programs attached by perf (pid/tid):
1223 * - we specifically enable or disable all events during
1224 * the record command
1225 *
1226 * When attaching events to already running traced we
1227 * enable/disable events specifically, as there's no
1228 * initial traced exec call.
1229 */
1230void evsel__config(struct evsel *evsel, struct record_opts *opts,
1231 struct callchain_param *callchain)
1232{
1233 struct evsel *leader = evsel__leader(evsel);
1234 struct perf_event_attr *attr = &evsel->core.attr;
1235 int track = evsel->tracking;
1236 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
1237
1238 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
1239 attr->inherit = target__has_cpu(&opts->target) ? 0 : !opts->no_inherit;
1240 attr->write_backward = opts->overwrite ? 1 : 0;
1241 attr->read_format = PERF_FORMAT_LOST;
1242
1243 evsel__set_sample_bit(evsel, IP);
1244 evsel__set_sample_bit(evsel, TID);
1245
1246 if (evsel->sample_read) {
1247 evsel__set_sample_bit(evsel, READ);
1248
1249 /*
1250 * We need ID even in case of single event, because
1251 * PERF_SAMPLE_READ process ID specific data.
1252 */
1253 evsel__set_sample_id(evsel, false);
1254
1255 /*
1256 * Apply group format only if we belong to group
1257 * with more than one members.
1258 */
1259 if (leader->core.nr_members > 1) {
1260 attr->read_format |= PERF_FORMAT_GROUP;
1261 }
1262
1263 /*
1264 * Inherit + SAMPLE_READ requires SAMPLE_TID in the read_format
1265 */
1266 if (attr->inherit) {
1267 evsel__set_sample_bit(evsel, TID);
1268 evsel->core.attr.read_format |=
1269 PERF_FORMAT_ID;
1270 }
1271 }
1272
1273 /*
1274 * We default some events to have a default interval. But keep
1275 * it a weak assumption overridable by the user.
1276 */
1277 if ((evsel->is_libpfm_event && !attr->sample_period) ||
1278 (!evsel->is_libpfm_event && (!attr->sample_period ||
1279 opts->user_freq != UINT_MAX ||
1280 opts->user_interval != ULLONG_MAX)))
1281 evsel__set_default_freq_period(opts, attr);
1282
1283 /*
1284 * If attr->freq was set (here or earlier), ask for period
1285 * to be sampled.
1286 */
1287 if (attr->freq)
1288 evsel__set_sample_bit(evsel, PERIOD);
1289
1290 if (opts->no_samples)
1291 attr->sample_freq = 0;
1292
1293 if (opts->inherit_stat) {
1294 evsel->core.attr.read_format |=
1295 PERF_FORMAT_TOTAL_TIME_ENABLED |
1296 PERF_FORMAT_TOTAL_TIME_RUNNING |
1297 PERF_FORMAT_ID;
1298 attr->inherit_stat = 1;
1299 }
1300
1301 if (opts->sample_address) {
1302 evsel__set_sample_bit(evsel, ADDR);
1303 attr->mmap_data = track;
1304 }
1305
1306 /*
1307 * We don't allow user space callchains for function trace
1308 * event, due to issues with page faults while tracing page
1309 * fault handler and its overall trickiness nature.
1310 */
1311 if (evsel__is_function_event(evsel))
1312 evsel->core.attr.exclude_callchain_user = 1;
1313
1314 if (callchain && callchain->enabled && !evsel->no_aux_samples)
1315 evsel__config_callchain(evsel, opts, callchain);
1316
1317 if (opts->sample_intr_regs && !evsel->no_aux_samples &&
1318 !evsel__is_dummy_event(evsel)) {
1319 attr->sample_regs_intr = opts->sample_intr_regs;
1320 evsel__set_sample_bit(evsel, REGS_INTR);
1321 }
1322
1323 if (opts->sample_user_regs && !evsel->no_aux_samples &&
1324 !evsel__is_dummy_event(evsel)) {
1325 attr->sample_regs_user |= opts->sample_user_regs;
1326 evsel__set_sample_bit(evsel, REGS_USER);
1327 }
1328
1329 if (target__has_cpu(&opts->target) || opts->sample_cpu)
1330 evsel__set_sample_bit(evsel, CPU);
1331
1332 /*
1333 * When the user explicitly disabled time don't force it here.
1334 */
1335 if (opts->sample_time &&
1336 (!perf_missing_features.sample_id_all &&
1337 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
1338 opts->sample_time_set)))
1339 evsel__set_sample_bit(evsel, TIME);
1340
1341 if (opts->raw_samples && !evsel->no_aux_samples) {
1342 evsel__set_sample_bit(evsel, TIME);
1343 evsel__set_sample_bit(evsel, RAW);
1344 evsel__set_sample_bit(evsel, CPU);
1345 }
1346
1347 if (opts->sample_address)
1348 evsel__set_sample_bit(evsel, DATA_SRC);
1349
1350 if (opts->sample_phys_addr)
1351 evsel__set_sample_bit(evsel, PHYS_ADDR);
1352
1353 if (opts->no_buffering) {
1354 attr->watermark = 0;
1355 attr->wakeup_events = 1;
1356 }
1357 if (opts->branch_stack && !evsel->no_aux_samples) {
1358 evsel__set_sample_bit(evsel, BRANCH_STACK);
1359 attr->branch_sample_type = opts->branch_stack;
1360 }
1361
1362 if (opts->sample_weight)
1363 arch_evsel__set_sample_weight(evsel);
1364
1365 attr->task = track;
1366 attr->mmap = track;
1367 attr->mmap2 = track && !perf_missing_features.mmap2;
1368 attr->comm = track;
1369 attr->build_id = track && opts->build_id;
1370
1371 /*
1372 * ksymbol is tracked separately with text poke because it needs to be
1373 * system wide and enabled immediately.
1374 */
1375 if (!opts->text_poke)
1376 attr->ksymbol = track && !perf_missing_features.ksymbol;
1377 attr->bpf_event = track && !opts->no_bpf_event && !perf_missing_features.bpf;
1378
1379 if (opts->record_namespaces)
1380 attr->namespaces = track;
1381
1382 if (opts->record_cgroup) {
1383 attr->cgroup = track && !perf_missing_features.cgroup;
1384 evsel__set_sample_bit(evsel, CGROUP);
1385 }
1386
1387 if (opts->sample_data_page_size)
1388 evsel__set_sample_bit(evsel, DATA_PAGE_SIZE);
1389
1390 if (opts->sample_code_page_size)
1391 evsel__set_sample_bit(evsel, CODE_PAGE_SIZE);
1392
1393 if (opts->record_switch_events)
1394 attr->context_switch = track;
1395
1396 if (opts->sample_transaction)
1397 evsel__set_sample_bit(evsel, TRANSACTION);
1398
1399 if (opts->running_time) {
1400 evsel->core.attr.read_format |=
1401 PERF_FORMAT_TOTAL_TIME_ENABLED |
1402 PERF_FORMAT_TOTAL_TIME_RUNNING;
1403 }
1404
1405 /*
1406 * XXX see the function comment above
1407 *
1408 * Disabling only independent events or group leaders,
1409 * keeping group members enabled.
1410 */
1411 if (evsel__is_group_leader(evsel))
1412 attr->disabled = 1;
1413
1414 /*
1415 * Setting enable_on_exec for independent events and
1416 * group leaders for traced executed by perf.
1417 */
1418 if (target__none(&opts->target) && evsel__is_group_leader(evsel) &&
1419 !opts->target.initial_delay)
1420 attr->enable_on_exec = 1;
1421
1422 if (evsel->immediate) {
1423 attr->disabled = 0;
1424 attr->enable_on_exec = 0;
1425 }
1426
1427 clockid = opts->clockid;
1428 if (opts->use_clockid) {
1429 attr->use_clockid = 1;
1430 attr->clockid = opts->clockid;
1431 }
1432
1433 if (evsel->precise_max)
1434 attr->precise_ip = 3;
1435
1436 if (opts->all_user) {
1437 attr->exclude_kernel = 1;
1438 attr->exclude_user = 0;
1439 }
1440
1441 if (opts->all_kernel) {
1442 attr->exclude_kernel = 0;
1443 attr->exclude_user = 1;
1444 }
1445
1446 if (evsel->core.own_cpus || evsel->unit)
1447 evsel->core.attr.read_format |= PERF_FORMAT_ID;
1448
1449 /*
1450 * Apply event specific term settings,
1451 * it overloads any global configuration.
1452 */
1453 evsel__apply_config_terms(evsel, opts, track);
1454
1455 evsel->ignore_missing_thread = opts->ignore_missing_thread;
1456
1457 /* The --period option takes the precedence. */
1458 if (opts->period_set) {
1459 if (opts->period)
1460 evsel__set_sample_bit(evsel, PERIOD);
1461 else
1462 evsel__reset_sample_bit(evsel, PERIOD);
1463 }
1464
1465 /*
1466 * A dummy event never triggers any actual counter and therefore
1467 * cannot be used with branch_stack.
1468 *
1469 * For initial_delay, a dummy event is added implicitly.
1470 * The software event will trigger -EOPNOTSUPP error out,
1471 * if BRANCH_STACK bit is set.
1472 */
1473 if (evsel__is_dummy_event(evsel))
1474 evsel__reset_sample_bit(evsel, BRANCH_STACK);
1475
1476 if (evsel__is_offcpu_event(evsel))
1477 evsel->core.attr.sample_type &= OFFCPU_SAMPLE_TYPES;
1478
1479 arch__post_evsel_config(evsel, attr);
1480}
1481
1482int evsel__set_filter(struct evsel *evsel, const char *filter)
1483{
1484 char *new_filter = strdup(filter);
1485
1486 if (new_filter != NULL) {
1487 free(evsel->filter);
1488 evsel->filter = new_filter;
1489 return 0;
1490 }
1491
1492 return -1;
1493}
1494
1495static int evsel__append_filter(struct evsel *evsel, const char *fmt, const char *filter)
1496{
1497 char *new_filter;
1498
1499 if (evsel->filter == NULL)
1500 return evsel__set_filter(evsel, filter);
1501
1502 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1503 free(evsel->filter);
1504 evsel->filter = new_filter;
1505 return 0;
1506 }
1507
1508 return -1;
1509}
1510
1511int evsel__append_tp_filter(struct evsel *evsel, const char *filter)
1512{
1513 return evsel__append_filter(evsel, "(%s) && (%s)", filter);
1514}
1515
1516int evsel__append_addr_filter(struct evsel *evsel, const char *filter)
1517{
1518 return evsel__append_filter(evsel, "%s,%s", filter);
1519}
1520
1521/* Caller has to clear disabled after going through all CPUs. */
1522int evsel__enable_cpu(struct evsel *evsel, int cpu_map_idx)
1523{
1524 return perf_evsel__enable_cpu(&evsel->core, cpu_map_idx);
1525}
1526
1527int evsel__enable(struct evsel *evsel)
1528{
1529 int err = perf_evsel__enable(&evsel->core);
1530
1531 if (!err)
1532 evsel->disabled = false;
1533 return err;
1534}
1535
1536/* Caller has to set disabled after going through all CPUs. */
1537int evsel__disable_cpu(struct evsel *evsel, int cpu_map_idx)
1538{
1539 return perf_evsel__disable_cpu(&evsel->core, cpu_map_idx);
1540}
1541
1542int evsel__disable(struct evsel *evsel)
1543{
1544 int err = perf_evsel__disable(&evsel->core);
1545 /*
1546 * We mark it disabled here so that tools that disable a event can
1547 * ignore events after they disable it. I.e. the ring buffer may have
1548 * already a few more events queued up before the kernel got the stop
1549 * request.
1550 */
1551 if (!err)
1552 evsel->disabled = true;
1553
1554 return err;
1555}
1556
1557void free_config_terms(struct list_head *config_terms)
1558{
1559 struct evsel_config_term *term, *h;
1560
1561 list_for_each_entry_safe(term, h, config_terms, list) {
1562 list_del_init(&term->list);
1563 if (term->free_str)
1564 zfree(&term->val.str);
1565 free(term);
1566 }
1567}
1568
1569static void evsel__free_config_terms(struct evsel *evsel)
1570{
1571 free_config_terms(&evsel->config_terms);
1572}
1573
1574void evsel__exit(struct evsel *evsel)
1575{
1576 assert(list_empty(&evsel->core.node));
1577 assert(evsel->evlist == NULL);
1578 bpf_counter__destroy(evsel);
1579 perf_bpf_filter__destroy(evsel);
1580 evsel__free_counts(evsel);
1581 perf_evsel__free_fd(&evsel->core);
1582 perf_evsel__free_id(&evsel->core);
1583 evsel__free_config_terms(evsel);
1584 cgroup__put(evsel->cgrp);
1585 perf_cpu_map__put(evsel->core.cpus);
1586 perf_cpu_map__put(evsel->core.own_cpus);
1587 perf_thread_map__put(evsel->core.threads);
1588 zfree(&evsel->group_name);
1589 zfree(&evsel->name);
1590 zfree(&evsel->filter);
1591 zfree(&evsel->group_pmu_name);
1592 zfree(&evsel->unit);
1593 zfree(&evsel->metric_id);
1594 evsel__zero_per_pkg(evsel);
1595 hashmap__free(evsel->per_pkg_mask);
1596 evsel->per_pkg_mask = NULL;
1597 zfree(&evsel->metric_events);
1598 perf_evsel__object.fini(evsel);
1599 if (evsel__tool_event(evsel) == TOOL_PMU__EVENT_SYSTEM_TIME ||
1600 evsel__tool_event(evsel) == TOOL_PMU__EVENT_USER_TIME)
1601 xyarray__delete(evsel->start_times);
1602}
1603
1604void evsel__delete(struct evsel *evsel)
1605{
1606 if (!evsel)
1607 return;
1608
1609 evsel__exit(evsel);
1610 free(evsel);
1611}
1612
1613void evsel__compute_deltas(struct evsel *evsel, int cpu_map_idx, int thread,
1614 struct perf_counts_values *count)
1615{
1616 struct perf_counts_values tmp;
1617
1618 if (!evsel->prev_raw_counts)
1619 return;
1620
1621 tmp = *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread);
1622 *perf_counts(evsel->prev_raw_counts, cpu_map_idx, thread) = *count;
1623
1624 count->val = count->val - tmp.val;
1625 count->ena = count->ena - tmp.ena;
1626 count->run = count->run - tmp.run;
1627}
1628
1629static int evsel__read_one(struct evsel *evsel, int cpu_map_idx, int thread)
1630{
1631 struct perf_counts_values *count = perf_counts(evsel->counts, cpu_map_idx, thread);
1632
1633 return perf_evsel__read(&evsel->core, cpu_map_idx, thread, count);
1634}
1635
1636static int evsel__read_retire_lat(struct evsel *evsel, int cpu_map_idx, int thread)
1637{
1638 return tpebs_set_evsel(evsel, cpu_map_idx, thread);
1639}
1640
1641static void evsel__set_count(struct evsel *counter, int cpu_map_idx, int thread,
1642 u64 val, u64 ena, u64 run, u64 lost)
1643{
1644 struct perf_counts_values *count;
1645
1646 count = perf_counts(counter->counts, cpu_map_idx, thread);
1647
1648 if (counter->retire_lat) {
1649 evsel__read_retire_lat(counter, cpu_map_idx, thread);
1650 perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true);
1651 return;
1652 }
1653
1654 count->val = val;
1655 count->ena = ena;
1656 count->run = run;
1657 count->lost = lost;
1658
1659 perf_counts__set_loaded(counter->counts, cpu_map_idx, thread, true);
1660}
1661
1662static bool evsel__group_has_tpebs(struct evsel *leader)
1663{
1664 struct evsel *evsel;
1665
1666 for_each_group_evsel(evsel, leader) {
1667 if (evsel__is_retire_lat(evsel))
1668 return true;
1669 }
1670 return false;
1671}
1672
1673static u64 evsel__group_read_nr_members(struct evsel *leader)
1674{
1675 u64 nr = leader->core.nr_members;
1676 struct evsel *evsel;
1677
1678 for_each_group_evsel(evsel, leader) {
1679 if (evsel__is_retire_lat(evsel))
1680 nr--;
1681 }
1682 return nr;
1683}
1684
1685static u64 evsel__group_read_size(struct evsel *leader)
1686{
1687 u64 read_format = leader->core.attr.read_format;
1688 int entry = sizeof(u64); /* value */
1689 int size = 0;
1690 int nr = 1;
1691
1692 if (!evsel__group_has_tpebs(leader))
1693 return perf_evsel__read_size(&leader->core);
1694
1695 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1696 size += sizeof(u64);
1697
1698 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1699 size += sizeof(u64);
1700
1701 if (read_format & PERF_FORMAT_ID)
1702 entry += sizeof(u64);
1703
1704 if (read_format & PERF_FORMAT_LOST)
1705 entry += sizeof(u64);
1706
1707 if (read_format & PERF_FORMAT_GROUP) {
1708 nr = evsel__group_read_nr_members(leader);
1709 size += sizeof(u64);
1710 }
1711
1712 size += entry * nr;
1713 return size;
1714}
1715
1716static int evsel__process_group_data(struct evsel *leader, int cpu_map_idx, int thread, u64 *data)
1717{
1718 u64 read_format = leader->core.attr.read_format;
1719 struct sample_read_value *v;
1720 u64 nr, ena = 0, run = 0, lost = 0;
1721
1722 nr = *data++;
1723
1724 if (nr != evsel__group_read_nr_members(leader))
1725 return -EINVAL;
1726
1727 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1728 ena = *data++;
1729
1730 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1731 run = *data++;
1732
1733 v = (void *)data;
1734 sample_read_group__for_each(v, nr, read_format) {
1735 struct evsel *counter;
1736
1737 counter = evlist__id2evsel(leader->evlist, v->id);
1738 if (!counter)
1739 return -EINVAL;
1740
1741 if (read_format & PERF_FORMAT_LOST)
1742 lost = v->lost;
1743
1744 evsel__set_count(counter, cpu_map_idx, thread, v->value, ena, run, lost);
1745 }
1746
1747 return 0;
1748}
1749
1750static int evsel__read_group(struct evsel *leader, int cpu_map_idx, int thread)
1751{
1752 struct perf_stat_evsel *ps = leader->stats;
1753 u64 read_format = leader->core.attr.read_format;
1754 int size = evsel__group_read_size(leader);
1755 u64 *data = ps->group_data;
1756
1757 if (!(read_format & PERF_FORMAT_ID))
1758 return -EINVAL;
1759
1760 if (!evsel__is_group_leader(leader))
1761 return -EINVAL;
1762
1763 if (!data) {
1764 data = zalloc(size);
1765 if (!data)
1766 return -ENOMEM;
1767
1768 ps->group_data = data;
1769 }
1770
1771 if (FD(leader, cpu_map_idx, thread) < 0)
1772 return -EINVAL;
1773
1774 if (readn(FD(leader, cpu_map_idx, thread), data, size) <= 0)
1775 return -errno;
1776
1777 return evsel__process_group_data(leader, cpu_map_idx, thread, data);
1778}
1779
1780bool __evsel__match(const struct evsel *evsel, u32 type, u64 config)
1781{
1782
1783 u32 e_type = evsel->core.attr.type;
1784 u64 e_config = evsel->core.attr.config;
1785
1786 if (e_type != type) {
1787 return type == PERF_TYPE_HARDWARE && evsel->pmu && evsel->pmu->is_core &&
1788 evsel->alternate_hw_config == config;
1789 }
1790
1791 if ((type == PERF_TYPE_HARDWARE || type == PERF_TYPE_HW_CACHE) &&
1792 perf_pmus__supports_extended_type())
1793 e_config &= PERF_HW_EVENT_MASK;
1794
1795 return e_config == config;
1796}
1797
1798int evsel__read_counter(struct evsel *evsel, int cpu_map_idx, int thread)
1799{
1800 if (evsel__is_tool(evsel))
1801 return evsel__tool_pmu_read(evsel, cpu_map_idx, thread);
1802
1803 if (evsel__is_hwmon(evsel))
1804 return evsel__hwmon_pmu_read(evsel, cpu_map_idx, thread);
1805
1806 if (evsel__is_retire_lat(evsel))
1807 return evsel__read_retire_lat(evsel, cpu_map_idx, thread);
1808
1809 if (evsel->core.attr.read_format & PERF_FORMAT_GROUP)
1810 return evsel__read_group(evsel, cpu_map_idx, thread);
1811
1812 return evsel__read_one(evsel, cpu_map_idx, thread);
1813}
1814
1815int __evsel__read_on_cpu(struct evsel *evsel, int cpu_map_idx, int thread, bool scale)
1816{
1817 struct perf_counts_values count;
1818 size_t nv = scale ? 3 : 1;
1819
1820 if (FD(evsel, cpu_map_idx, thread) < 0)
1821 return -EINVAL;
1822
1823 if (evsel->counts == NULL && evsel__alloc_counts(evsel) < 0)
1824 return -ENOMEM;
1825
1826 if (readn(FD(evsel, cpu_map_idx, thread), &count, nv * sizeof(u64)) <= 0)
1827 return -errno;
1828
1829 evsel__compute_deltas(evsel, cpu_map_idx, thread, &count);
1830 perf_counts_values__scale(&count, scale, NULL);
1831 *perf_counts(evsel->counts, cpu_map_idx, thread) = count;
1832 return 0;
1833}
1834
1835static int evsel__match_other_cpu(struct evsel *evsel, struct evsel *other,
1836 int cpu_map_idx)
1837{
1838 struct perf_cpu cpu;
1839
1840 cpu = perf_cpu_map__cpu(evsel->core.cpus, cpu_map_idx);
1841 return perf_cpu_map__idx(other->core.cpus, cpu);
1842}
1843
1844static int evsel__hybrid_group_cpu_map_idx(struct evsel *evsel, int cpu_map_idx)
1845{
1846 struct evsel *leader = evsel__leader(evsel);
1847
1848 if ((evsel__is_hybrid(evsel) && !evsel__is_hybrid(leader)) ||
1849 (!evsel__is_hybrid(evsel) && evsel__is_hybrid(leader))) {
1850 return evsel__match_other_cpu(evsel, leader, cpu_map_idx);
1851 }
1852
1853 return cpu_map_idx;
1854}
1855
1856static int get_group_fd(struct evsel *evsel, int cpu_map_idx, int thread)
1857{
1858 struct evsel *leader = evsel__leader(evsel);
1859 int fd;
1860
1861 if (evsel__is_group_leader(evsel))
1862 return -1;
1863
1864 /*
1865 * Leader must be already processed/open,
1866 * if not it's a bug.
1867 */
1868 BUG_ON(!leader->core.fd);
1869
1870 cpu_map_idx = evsel__hybrid_group_cpu_map_idx(evsel, cpu_map_idx);
1871 if (cpu_map_idx == -1)
1872 return -1;
1873
1874 fd = FD(leader, cpu_map_idx, thread);
1875 BUG_ON(fd == -1 && !leader->skippable);
1876
1877 /*
1878 * When the leader has been skipped, return -2 to distinguish from no
1879 * group leader case.
1880 */
1881 return fd == -1 ? -2 : fd;
1882}
1883
1884static void evsel__remove_fd(struct evsel *pos, int nr_cpus, int nr_threads, int thread_idx)
1885{
1886 for (int cpu = 0; cpu < nr_cpus; cpu++)
1887 for (int thread = thread_idx; thread < nr_threads - 1; thread++)
1888 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
1889}
1890
1891static int update_fds(struct evsel *evsel,
1892 int nr_cpus, int cpu_map_idx,
1893 int nr_threads, int thread_idx)
1894{
1895 struct evsel *pos;
1896
1897 if (cpu_map_idx >= nr_cpus || thread_idx >= nr_threads)
1898 return -EINVAL;
1899
1900 evlist__for_each_entry(evsel->evlist, pos) {
1901 nr_cpus = pos != evsel ? nr_cpus : cpu_map_idx;
1902
1903 evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
1904
1905 /*
1906 * Since fds for next evsel has not been created,
1907 * there is no need to iterate whole event list.
1908 */
1909 if (pos == evsel)
1910 break;
1911 }
1912 return 0;
1913}
1914
1915static bool evsel__ignore_missing_thread(struct evsel *evsel,
1916 int nr_cpus, int cpu_map_idx,
1917 struct perf_thread_map *threads,
1918 int thread, int err)
1919{
1920 pid_t ignore_pid = perf_thread_map__pid(threads, thread);
1921
1922 if (!evsel->ignore_missing_thread)
1923 return false;
1924
1925 /* The system wide setup does not work with threads. */
1926 if (evsel->core.system_wide)
1927 return false;
1928
1929 /* The -ESRCH is perf event syscall errno for pid's not found. */
1930 if (err != -ESRCH)
1931 return false;
1932
1933 /* If there's only one thread, let it fail. */
1934 if (threads->nr == 1)
1935 return false;
1936
1937 /*
1938 * We should remove fd for missing_thread first
1939 * because thread_map__remove() will decrease threads->nr.
1940 */
1941 if (update_fds(evsel, nr_cpus, cpu_map_idx, threads->nr, thread))
1942 return false;
1943
1944 if (thread_map__remove(threads, thread))
1945 return false;
1946
1947 pr_warning("WARNING: Ignored open failure for pid %d\n",
1948 ignore_pid);
1949 return true;
1950}
1951
1952static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1953 void *priv __maybe_unused)
1954{
1955 return fprintf(fp, " %-32s %s\n", name, val);
1956}
1957
1958static void display_attr(struct perf_event_attr *attr)
1959{
1960 if (verbose >= 2 || debug_peo_args) {
1961 fprintf(stderr, "%.60s\n", graph_dotted_line);
1962 fprintf(stderr, "perf_event_attr:\n");
1963 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL);
1964 fprintf(stderr, "%.60s\n", graph_dotted_line);
1965 }
1966}
1967
1968bool evsel__precise_ip_fallback(struct evsel *evsel)
1969{
1970 /* Do not try less precise if not requested. */
1971 if (!evsel->precise_max)
1972 return false;
1973
1974 /*
1975 * We tried all the precise_ip values, and it's
1976 * still failing, so leave it to standard fallback.
1977 */
1978 if (!evsel->core.attr.precise_ip) {
1979 evsel->core.attr.precise_ip = evsel->precise_ip_original;
1980 return false;
1981 }
1982
1983 if (!evsel->precise_ip_original)
1984 evsel->precise_ip_original = evsel->core.attr.precise_ip;
1985
1986 evsel->core.attr.precise_ip--;
1987 pr_debug2_peo("decreasing precise_ip by one (%d)\n", evsel->core.attr.precise_ip);
1988 display_attr(&evsel->core.attr);
1989 return true;
1990}
1991
1992static struct perf_cpu_map *empty_cpu_map;
1993static struct perf_thread_map *empty_thread_map;
1994
1995static int __evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus,
1996 struct perf_thread_map *threads)
1997{
1998 int ret = 0;
1999 int nthreads = perf_thread_map__nr(threads);
2000
2001 if ((perf_missing_features.write_backward && evsel->core.attr.write_backward) ||
2002 (perf_missing_features.aux_output && evsel->core.attr.aux_output))
2003 return -EINVAL;
2004
2005 if (cpus == NULL) {
2006 if (empty_cpu_map == NULL) {
2007 empty_cpu_map = perf_cpu_map__new_any_cpu();
2008 if (empty_cpu_map == NULL)
2009 return -ENOMEM;
2010 }
2011
2012 cpus = empty_cpu_map;
2013 }
2014
2015 if (threads == NULL) {
2016 if (empty_thread_map == NULL) {
2017 empty_thread_map = thread_map__new_by_tid(-1);
2018 if (empty_thread_map == NULL)
2019 return -ENOMEM;
2020 }
2021
2022 threads = empty_thread_map;
2023 }
2024
2025 if (evsel->core.fd == NULL &&
2026 perf_evsel__alloc_fd(&evsel->core, perf_cpu_map__nr(cpus), nthreads) < 0)
2027 return -ENOMEM;
2028
2029 if (evsel__is_tool(evsel))
2030 ret = evsel__tool_pmu_prepare_open(evsel, cpus, nthreads);
2031
2032 evsel->open_flags = PERF_FLAG_FD_CLOEXEC;
2033 if (evsel->cgrp)
2034 evsel->open_flags |= PERF_FLAG_PID_CGROUP;
2035
2036 return ret;
2037}
2038
2039static void evsel__disable_missing_features(struct evsel *evsel)
2040{
2041 if (perf_missing_features.inherit_sample_read && evsel->core.attr.inherit &&
2042 (evsel->core.attr.sample_type & PERF_SAMPLE_READ))
2043 evsel->core.attr.inherit = 0;
2044 if (perf_missing_features.branch_counters)
2045 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_COUNTERS;
2046 if (perf_missing_features.read_lost)
2047 evsel->core.attr.read_format &= ~PERF_FORMAT_LOST;
2048 if (perf_missing_features.weight_struct) {
2049 evsel__set_sample_bit(evsel, WEIGHT);
2050 evsel__reset_sample_bit(evsel, WEIGHT_STRUCT);
2051 }
2052 if (perf_missing_features.clockid_wrong)
2053 evsel->core.attr.clockid = CLOCK_MONOTONIC; /* should always work */
2054 if (perf_missing_features.clockid) {
2055 evsel->core.attr.use_clockid = 0;
2056 evsel->core.attr.clockid = 0;
2057 }
2058 if (perf_missing_features.cloexec)
2059 evsel->open_flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
2060 if (perf_missing_features.mmap2)
2061 evsel->core.attr.mmap2 = 0;
2062 if (evsel->pmu && evsel->pmu->missing_features.exclude_guest)
2063 evsel->core.attr.exclude_guest = evsel->core.attr.exclude_host = 0;
2064 if (perf_missing_features.lbr_flags)
2065 evsel->core.attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
2066 PERF_SAMPLE_BRANCH_NO_CYCLES);
2067 if (perf_missing_features.group_read && evsel->core.attr.inherit)
2068 evsel->core.attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
2069 if (perf_missing_features.ksymbol)
2070 evsel->core.attr.ksymbol = 0;
2071 if (perf_missing_features.bpf)
2072 evsel->core.attr.bpf_event = 0;
2073 if (perf_missing_features.branch_hw_idx)
2074 evsel->core.attr.branch_sample_type &= ~PERF_SAMPLE_BRANCH_HW_INDEX;
2075 if (perf_missing_features.sample_id_all)
2076 evsel->core.attr.sample_id_all = 0;
2077}
2078
2079int evsel__prepare_open(struct evsel *evsel, struct perf_cpu_map *cpus,
2080 struct perf_thread_map *threads)
2081{
2082 int err;
2083
2084 err = __evsel__prepare_open(evsel, cpus, threads);
2085 if (err)
2086 return err;
2087
2088 evsel__disable_missing_features(evsel);
2089
2090 return err;
2091}
2092
2093static bool has_attr_feature(struct perf_event_attr *attr, unsigned long flags)
2094{
2095 int fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, /*cpu=*/-1,
2096 /*group_fd=*/-1, flags);
2097 close(fd);
2098
2099 if (fd < 0) {
2100 attr->exclude_kernel = 1;
2101
2102 fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, /*cpu=*/-1,
2103 /*group_fd=*/-1, flags);
2104 close(fd);
2105 }
2106
2107 if (fd < 0) {
2108 attr->exclude_hv = 1;
2109
2110 fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, /*cpu=*/-1,
2111 /*group_fd=*/-1, flags);
2112 close(fd);
2113 }
2114
2115 if (fd < 0) {
2116 attr->exclude_guest = 1;
2117
2118 fd = syscall(SYS_perf_event_open, attr, /*pid=*/0, /*cpu=*/-1,
2119 /*group_fd=*/-1, flags);
2120 close(fd);
2121 }
2122
2123 attr->exclude_kernel = 0;
2124 attr->exclude_guest = 0;
2125 attr->exclude_hv = 0;
2126
2127 return fd >= 0;
2128}
2129
2130static void evsel__detect_missing_pmu_features(struct evsel *evsel)
2131{
2132 struct perf_event_attr attr = {
2133 .type = evsel->core.attr.type,
2134 .config = evsel->core.attr.config,
2135 .disabled = 1,
2136 };
2137 struct perf_pmu *pmu = evsel->pmu;
2138 int old_errno;
2139
2140 old_errno = errno;
2141
2142 if (pmu == NULL)
2143 pmu = evsel->pmu = evsel__find_pmu(evsel);
2144
2145 if (pmu == NULL || pmu->missing_features.checked)
2146 goto out;
2147
2148 /*
2149 * Must probe features in the order they were added to the
2150 * perf_event_attr interface. These are kernel core limitation but
2151 * specific to PMUs with branch stack. So we can detect with the given
2152 * hardware event and stop on the first one succeeded.
2153 */
2154
2155 /* Please add new feature detection here. */
2156
2157 attr.exclude_guest = 1;
2158 if (has_attr_feature(&attr, /*flags=*/0))
2159 goto found;
2160 pmu->missing_features.exclude_guest = true;
2161 pr_debug2("switching off exclude_guest for PMU %s\n", pmu->name);
2162
2163found:
2164 pmu->missing_features.checked = true;
2165out:
2166 errno = old_errno;
2167}
2168
2169static void evsel__detect_missing_brstack_features(struct evsel *evsel)
2170{
2171 static bool detection_done = false;
2172 struct perf_event_attr attr = {
2173 .type = evsel->core.attr.type,
2174 .config = evsel->core.attr.config,
2175 .disabled = 1,
2176 .sample_type = PERF_SAMPLE_BRANCH_STACK,
2177 .sample_period = 1000,
2178 };
2179 int old_errno;
2180
2181 if (detection_done)
2182 return;
2183
2184 old_errno = errno;
2185
2186 /*
2187 * Must probe features in the order they were added to the
2188 * perf_event_attr interface. These are PMU specific limitation
2189 * so we can detect with the given hardware event and stop on the
2190 * first one succeeded.
2191 */
2192
2193 /* Please add new feature detection here. */
2194
2195 attr.branch_sample_type = PERF_SAMPLE_BRANCH_COUNTERS;
2196 if (has_attr_feature(&attr, /*flags=*/0))
2197 goto found;
2198 perf_missing_features.branch_counters = true;
2199 pr_debug2("switching off branch counters support\n");
2200
2201 attr.branch_sample_type = PERF_SAMPLE_BRANCH_HW_INDEX;
2202 if (has_attr_feature(&attr, /*flags=*/0))
2203 goto found;
2204 perf_missing_features.branch_hw_idx = true;
2205 pr_debug2("switching off branch HW index support\n");
2206
2207 attr.branch_sample_type = PERF_SAMPLE_BRANCH_NO_CYCLES | PERF_SAMPLE_BRANCH_NO_FLAGS;
2208 if (has_attr_feature(&attr, /*flags=*/0))
2209 goto found;
2210 perf_missing_features.lbr_flags = true;
2211 pr_debug2_peo("switching off branch sample type no (cycles/flags)\n");
2212
2213found:
2214 detection_done = true;
2215 errno = old_errno;
2216}
2217
2218static bool evsel__detect_missing_features(struct evsel *evsel)
2219{
2220 static bool detection_done = false;
2221 struct perf_event_attr attr = {
2222 .type = PERF_TYPE_SOFTWARE,
2223 .config = PERF_COUNT_SW_TASK_CLOCK,
2224 .disabled = 1,
2225 };
2226 int old_errno;
2227
2228 evsel__detect_missing_pmu_features(evsel);
2229
2230 if (evsel__has_br_stack(evsel))
2231 evsel__detect_missing_brstack_features(evsel);
2232
2233 if (detection_done)
2234 goto check;
2235
2236 old_errno = errno;
2237
2238 /*
2239 * Must probe features in the order they were added to the
2240 * perf_event_attr interface. These are kernel core limitation
2241 * not PMU-specific so we can detect with a software event and
2242 * stop on the first one succeeded.
2243 */
2244
2245 /* Please add new feature detection here. */
2246
2247 attr.inherit = true;
2248 attr.sample_type = PERF_SAMPLE_READ;
2249 if (has_attr_feature(&attr, /*flags=*/0))
2250 goto found;
2251 perf_missing_features.inherit_sample_read = true;
2252 pr_debug2("Using PERF_SAMPLE_READ / :S modifier is not compatible with inherit, falling back to no-inherit.\n");
2253 attr.inherit = false;
2254 attr.sample_type = 0;
2255
2256 attr.read_format = PERF_FORMAT_LOST;
2257 if (has_attr_feature(&attr, /*flags=*/0))
2258 goto found;
2259 perf_missing_features.read_lost = true;
2260 pr_debug2("switching off PERF_FORMAT_LOST support\n");
2261 attr.read_format = 0;
2262
2263 attr.sample_type = PERF_SAMPLE_WEIGHT_STRUCT;
2264 if (has_attr_feature(&attr, /*flags=*/0))
2265 goto found;
2266 perf_missing_features.weight_struct = true;
2267 pr_debug2("switching off weight struct support\n");
2268 attr.sample_type = 0;
2269
2270 attr.sample_type = PERF_SAMPLE_CODE_PAGE_SIZE;
2271 if (has_attr_feature(&attr, /*flags=*/0))
2272 goto found;
2273 perf_missing_features.code_page_size = true;
2274 pr_debug2_peo("Kernel has no PERF_SAMPLE_CODE_PAGE_SIZE support\n");
2275 attr.sample_type = 0;
2276
2277 attr.sample_type = PERF_SAMPLE_DATA_PAGE_SIZE;
2278 if (has_attr_feature(&attr, /*flags=*/0))
2279 goto found;
2280 perf_missing_features.data_page_size = true;
2281 pr_debug2_peo("Kernel has no PERF_SAMPLE_DATA_PAGE_SIZE support\n");
2282 attr.sample_type = 0;
2283
2284 attr.cgroup = 1;
2285 if (has_attr_feature(&attr, /*flags=*/0))
2286 goto found;
2287 perf_missing_features.cgroup = true;
2288 pr_debug2_peo("Kernel has no cgroup sampling support\n");
2289 attr.cgroup = 0;
2290
2291 attr.aux_output = 1;
2292 if (has_attr_feature(&attr, /*flags=*/0))
2293 goto found;
2294 perf_missing_features.aux_output = true;
2295 pr_debug2_peo("Kernel has no attr.aux_output support\n");
2296 attr.aux_output = 0;
2297
2298 attr.bpf_event = 1;
2299 if (has_attr_feature(&attr, /*flags=*/0))
2300 goto found;
2301 perf_missing_features.bpf = true;
2302 pr_debug2_peo("switching off bpf_event\n");
2303 attr.bpf_event = 0;
2304
2305 attr.ksymbol = 1;
2306 if (has_attr_feature(&attr, /*flags=*/0))
2307 goto found;
2308 perf_missing_features.ksymbol = true;
2309 pr_debug2_peo("switching off ksymbol\n");
2310 attr.ksymbol = 0;
2311
2312 attr.write_backward = 1;
2313 if (has_attr_feature(&attr, /*flags=*/0))
2314 goto found;
2315 perf_missing_features.write_backward = true;
2316 pr_debug2_peo("switching off write_backward\n");
2317 attr.write_backward = 0;
2318
2319 attr.use_clockid = 1;
2320 attr.clockid = CLOCK_MONOTONIC;
2321 if (has_attr_feature(&attr, /*flags=*/0))
2322 goto found;
2323 perf_missing_features.clockid = true;
2324 pr_debug2_peo("switching off clockid\n");
2325 attr.use_clockid = 0;
2326 attr.clockid = 0;
2327
2328 if (has_attr_feature(&attr, /*flags=*/PERF_FLAG_FD_CLOEXEC))
2329 goto found;
2330 perf_missing_features.cloexec = true;
2331 pr_debug2_peo("switching off cloexec flag\n");
2332
2333 attr.mmap2 = 1;
2334 if (has_attr_feature(&attr, /*flags=*/0))
2335 goto found;
2336 perf_missing_features.mmap2 = true;
2337 pr_debug2_peo("switching off mmap2\n");
2338 attr.mmap2 = 0;
2339
2340 /* set this unconditionally? */
2341 perf_missing_features.sample_id_all = true;
2342 pr_debug2_peo("switching off sample_id_all\n");
2343
2344 attr.inherit = 1;
2345 attr.read_format = PERF_FORMAT_GROUP;
2346 if (has_attr_feature(&attr, /*flags=*/0))
2347 goto found;
2348 perf_missing_features.group_read = true;
2349 pr_debug2_peo("switching off group read\n");
2350 attr.inherit = 0;
2351 attr.read_format = 0;
2352
2353found:
2354 detection_done = true;
2355 errno = old_errno;
2356
2357check:
2358 if (evsel->core.attr.inherit &&
2359 (evsel->core.attr.sample_type & PERF_SAMPLE_READ) &&
2360 perf_missing_features.inherit_sample_read)
2361 return true;
2362
2363 if ((evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS) &&
2364 perf_missing_features.branch_counters)
2365 return true;
2366
2367 if ((evsel->core.attr.read_format & PERF_FORMAT_LOST) &&
2368 perf_missing_features.read_lost)
2369 return true;
2370
2371 if ((evsel->core.attr.sample_type & PERF_SAMPLE_WEIGHT_STRUCT) &&
2372 perf_missing_features.weight_struct)
2373 return true;
2374
2375 if (evsel->core.attr.use_clockid && evsel->core.attr.clockid != CLOCK_MONOTONIC &&
2376 !perf_missing_features.clockid) {
2377 perf_missing_features.clockid_wrong = true;
2378 return true;
2379 }
2380
2381 if (evsel->core.attr.use_clockid && perf_missing_features.clockid)
2382 return true;
2383
2384 if ((evsel->open_flags & PERF_FLAG_FD_CLOEXEC) &&
2385 perf_missing_features.cloexec)
2386 return true;
2387
2388 if (evsel->core.attr.mmap2 && perf_missing_features.mmap2)
2389 return true;
2390
2391 if ((evsel->core.attr.branch_sample_type & (PERF_SAMPLE_BRANCH_NO_FLAGS |
2392 PERF_SAMPLE_BRANCH_NO_CYCLES)) &&
2393 perf_missing_features.lbr_flags)
2394 return true;
2395
2396 if (evsel->core.attr.inherit && (evsel->core.attr.read_format & PERF_FORMAT_GROUP) &&
2397 perf_missing_features.group_read)
2398 return true;
2399
2400 if (evsel->core.attr.ksymbol && perf_missing_features.ksymbol)
2401 return true;
2402
2403 if (evsel->core.attr.bpf_event && perf_missing_features.bpf)
2404 return true;
2405
2406 if ((evsel->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_HW_INDEX) &&
2407 perf_missing_features.branch_hw_idx)
2408 return true;
2409
2410 if (evsel->core.attr.sample_id_all && perf_missing_features.sample_id_all)
2411 return true;
2412
2413 return false;
2414}
2415
2416static bool evsel__handle_error_quirks(struct evsel *evsel, int error)
2417{
2418 /*
2419 * AMD core PMU tries to forward events with precise_ip to IBS PMU
2420 * implicitly. But IBS PMU has more restrictions so it can fail with
2421 * supported event attributes. Let's forward it back to the core PMU
2422 * by clearing precise_ip only if it's from precise_max (:P).
2423 */
2424 if ((error == -EINVAL || error == -ENOENT) && x86__is_amd_cpu() &&
2425 evsel->core.attr.precise_ip && evsel->precise_max) {
2426 evsel->core.attr.precise_ip = 0;
2427 pr_debug2_peo("removing precise_ip on AMD\n");
2428 display_attr(&evsel->core.attr);
2429 return true;
2430 }
2431
2432 return false;
2433}
2434
2435static int evsel__open_cpu(struct evsel *evsel, struct perf_cpu_map *cpus,
2436 struct perf_thread_map *threads,
2437 int start_cpu_map_idx, int end_cpu_map_idx)
2438{
2439 int idx, thread, nthreads;
2440 int pid = -1, err, old_errno;
2441 enum rlimit_action set_rlimit = NO_CHANGE;
2442
2443 if (evsel__is_retire_lat(evsel))
2444 return tpebs_start(evsel->evlist);
2445
2446 err = __evsel__prepare_open(evsel, cpus, threads);
2447 if (err)
2448 return err;
2449
2450 if (cpus == NULL)
2451 cpus = empty_cpu_map;
2452
2453 if (threads == NULL)
2454 threads = empty_thread_map;
2455
2456 nthreads = perf_thread_map__nr(threads);
2457
2458 if (evsel->cgrp)
2459 pid = evsel->cgrp->fd;
2460
2461fallback_missing_features:
2462 evsel__disable_missing_features(evsel);
2463
2464 pr_debug3("Opening: %s\n", evsel__name(evsel));
2465 display_attr(&evsel->core.attr);
2466
2467 if (evsel__is_tool(evsel)) {
2468 return evsel__tool_pmu_open(evsel, threads,
2469 start_cpu_map_idx,
2470 end_cpu_map_idx);
2471 }
2472 if (evsel__is_hwmon(evsel)) {
2473 return evsel__hwmon_pmu_open(evsel, threads,
2474 start_cpu_map_idx,
2475 end_cpu_map_idx);
2476 }
2477
2478 for (idx = start_cpu_map_idx; idx < end_cpu_map_idx; idx++) {
2479
2480 for (thread = 0; thread < nthreads; thread++) {
2481 int fd, group_fd;
2482retry_open:
2483 if (thread >= nthreads)
2484 break;
2485
2486 if (!evsel->cgrp && !evsel->core.system_wide)
2487 pid = perf_thread_map__pid(threads, thread);
2488
2489 group_fd = get_group_fd(evsel, idx, thread);
2490
2491 if (group_fd == -2) {
2492 pr_debug("broken group leader for %s\n", evsel->name);
2493 err = -EINVAL;
2494 goto out_close;
2495 }
2496
2497 /* Debug message used by test scripts */
2498 pr_debug2_peo("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx",
2499 pid, perf_cpu_map__cpu(cpus, idx).cpu, group_fd, evsel->open_flags);
2500
2501 fd = sys_perf_event_open(&evsel->core.attr, pid,
2502 perf_cpu_map__cpu(cpus, idx).cpu,
2503 group_fd, evsel->open_flags);
2504
2505 FD(evsel, idx, thread) = fd;
2506
2507 if (fd < 0) {
2508 err = -errno;
2509
2510 pr_debug2_peo("\nsys_perf_event_open failed, error %d\n",
2511 err);
2512 goto try_fallback;
2513 }
2514
2515 bpf_counter__install_pe(evsel, idx, fd);
2516
2517 if (unlikely(test_attr__enabled())) {
2518 test_attr__open(&evsel->core.attr, pid,
2519 perf_cpu_map__cpu(cpus, idx),
2520 fd, group_fd, evsel->open_flags);
2521 }
2522
2523 /* Debug message used by test scripts */
2524 pr_debug2_peo(" = %d\n", fd);
2525
2526 if (evsel->bpf_fd >= 0) {
2527 int evt_fd = fd;
2528 int bpf_fd = evsel->bpf_fd;
2529
2530 err = ioctl(evt_fd,
2531 PERF_EVENT_IOC_SET_BPF,
2532 bpf_fd);
2533 if (err && errno != EEXIST) {
2534 pr_err("failed to attach bpf fd %d: %s\n",
2535 bpf_fd, strerror(errno));
2536 err = -EINVAL;
2537 goto out_close;
2538 }
2539 }
2540
2541 set_rlimit = NO_CHANGE;
2542
2543 /*
2544 * If we succeeded but had to kill clockid, fail and
2545 * have evsel__open_strerror() print us a nice error.
2546 */
2547 if (perf_missing_features.clockid ||
2548 perf_missing_features.clockid_wrong) {
2549 err = -EINVAL;
2550 goto out_close;
2551 }
2552 }
2553 }
2554
2555 return 0;
2556
2557try_fallback:
2558 if (evsel__ignore_missing_thread(evsel, perf_cpu_map__nr(cpus),
2559 idx, threads, thread, err)) {
2560 /* We just removed 1 thread, so lower the upper nthreads limit. */
2561 nthreads--;
2562
2563 /* ... and pretend like nothing have happened. */
2564 err = 0;
2565 goto retry_open;
2566 }
2567 /*
2568 * perf stat needs between 5 and 22 fds per CPU. When we run out
2569 * of them try to increase the limits.
2570 */
2571 if (err == -EMFILE && rlimit__increase_nofile(&set_rlimit))
2572 goto retry_open;
2573
2574 if (err == -EINVAL && evsel__detect_missing_features(evsel))
2575 goto fallback_missing_features;
2576
2577 if (evsel__precise_ip_fallback(evsel))
2578 goto retry_open;
2579
2580 if (evsel__handle_error_quirks(evsel, err))
2581 goto retry_open;
2582
2583out_close:
2584 if (err)
2585 threads->err_thread = thread;
2586
2587 old_errno = errno;
2588 do {
2589 while (--thread >= 0) {
2590 if (FD(evsel, idx, thread) >= 0)
2591 close(FD(evsel, idx, thread));
2592 FD(evsel, idx, thread) = -1;
2593 }
2594 thread = nthreads;
2595 } while (--idx >= 0);
2596 errno = old_errno;
2597 return err;
2598}
2599
2600int evsel__open(struct evsel *evsel, struct perf_cpu_map *cpus,
2601 struct perf_thread_map *threads)
2602{
2603 return evsel__open_cpu(evsel, cpus, threads, 0, perf_cpu_map__nr(cpus));
2604}
2605
2606void evsel__close(struct evsel *evsel)
2607{
2608 if (evsel__is_retire_lat(evsel))
2609 tpebs_delete();
2610 perf_evsel__close(&evsel->core);
2611 perf_evsel__free_id(&evsel->core);
2612}
2613
2614int evsel__open_per_cpu(struct evsel *evsel, struct perf_cpu_map *cpus, int cpu_map_idx)
2615{
2616 if (cpu_map_idx == -1)
2617 return evsel__open_cpu(evsel, cpus, NULL, 0, perf_cpu_map__nr(cpus));
2618
2619 return evsel__open_cpu(evsel, cpus, NULL, cpu_map_idx, cpu_map_idx + 1);
2620}
2621
2622int evsel__open_per_thread(struct evsel *evsel, struct perf_thread_map *threads)
2623{
2624 return evsel__open(evsel, NULL, threads);
2625}
2626
2627static int perf_evsel__parse_id_sample(const struct evsel *evsel,
2628 const union perf_event *event,
2629 struct perf_sample *sample)
2630{
2631 u64 type = evsel->core.attr.sample_type;
2632 const __u64 *array = event->sample.array;
2633 bool swapped = evsel->needs_swap;
2634 union u64_swap u;
2635
2636 array += ((event->header.size -
2637 sizeof(event->header)) / sizeof(u64)) - 1;
2638
2639 if (type & PERF_SAMPLE_IDENTIFIER) {
2640 sample->id = *array;
2641 array--;
2642 }
2643
2644 if (type & PERF_SAMPLE_CPU) {
2645 u.val64 = *array;
2646 if (swapped) {
2647 /* undo swap of u64, then swap on individual u32s */
2648 u.val64 = bswap_64(u.val64);
2649 u.val32[0] = bswap_32(u.val32[0]);
2650 }
2651
2652 sample->cpu = u.val32[0];
2653 array--;
2654 }
2655
2656 if (type & PERF_SAMPLE_STREAM_ID) {
2657 sample->stream_id = *array;
2658 array--;
2659 }
2660
2661 if (type & PERF_SAMPLE_ID) {
2662 sample->id = *array;
2663 array--;
2664 }
2665
2666 if (type & PERF_SAMPLE_TIME) {
2667 sample->time = *array;
2668 array--;
2669 }
2670
2671 if (type & PERF_SAMPLE_TID) {
2672 u.val64 = *array;
2673 if (swapped) {
2674 /* undo swap of u64, then swap on individual u32s */
2675 u.val64 = bswap_64(u.val64);
2676 u.val32[0] = bswap_32(u.val32[0]);
2677 u.val32[1] = bswap_32(u.val32[1]);
2678 }
2679
2680 sample->pid = u.val32[0];
2681 sample->tid = u.val32[1];
2682 array--;
2683 }
2684
2685 return 0;
2686}
2687
2688static inline bool overflow(const void *endp, u16 max_size, const void *offset,
2689 u64 size)
2690{
2691 return size > max_size || offset + size > endp;
2692}
2693
2694#define OVERFLOW_CHECK(offset, size, max_size) \
2695 do { \
2696 if (overflow(endp, (max_size), (offset), (size))) \
2697 return -EFAULT; \
2698 } while (0)
2699
2700#define OVERFLOW_CHECK_u64(offset) \
2701 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
2702
2703static int
2704perf_event__check_size(union perf_event *event, unsigned int sample_size)
2705{
2706 /*
2707 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
2708 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
2709 * check the format does not go past the end of the event.
2710 */
2711 if (sample_size + sizeof(event->header) > event->header.size)
2712 return -EFAULT;
2713
2714 return 0;
2715}
2716
2717void __weak arch_perf_parse_sample_weight(struct perf_sample *data,
2718 const __u64 *array,
2719 u64 type __maybe_unused)
2720{
2721 data->weight = *array;
2722}
2723
2724u64 evsel__bitfield_swap_branch_flags(u64 value)
2725{
2726 u64 new_val = 0;
2727
2728 /*
2729 * branch_flags
2730 * union {
2731 * u64 values;
2732 * struct {
2733 * mispred:1 //target mispredicted
2734 * predicted:1 //target predicted
2735 * in_tx:1 //in transaction
2736 * abort:1 //transaction abort
2737 * cycles:16 //cycle count to last branch
2738 * type:4 //branch type
2739 * spec:2 //branch speculation info
2740 * new_type:4 //additional branch type
2741 * priv:3 //privilege level
2742 * reserved:31
2743 * }
2744 * }
2745 *
2746 * Avoid bswap64() the entire branch_flag.value,
2747 * as it has variable bit-field sizes. Instead the
2748 * macro takes the bit-field position/size,
2749 * swaps it based on the host endianness.
2750 */
2751 if (host_is_bigendian()) {
2752 new_val = bitfield_swap(value, 0, 1);
2753 new_val |= bitfield_swap(value, 1, 1);
2754 new_val |= bitfield_swap(value, 2, 1);
2755 new_val |= bitfield_swap(value, 3, 1);
2756 new_val |= bitfield_swap(value, 4, 16);
2757 new_val |= bitfield_swap(value, 20, 4);
2758 new_val |= bitfield_swap(value, 24, 2);
2759 new_val |= bitfield_swap(value, 26, 4);
2760 new_val |= bitfield_swap(value, 30, 3);
2761 new_val |= bitfield_swap(value, 33, 31);
2762 } else {
2763 new_val = bitfield_swap(value, 63, 1);
2764 new_val |= bitfield_swap(value, 62, 1);
2765 new_val |= bitfield_swap(value, 61, 1);
2766 new_val |= bitfield_swap(value, 60, 1);
2767 new_val |= bitfield_swap(value, 44, 16);
2768 new_val |= bitfield_swap(value, 40, 4);
2769 new_val |= bitfield_swap(value, 38, 2);
2770 new_val |= bitfield_swap(value, 34, 4);
2771 new_val |= bitfield_swap(value, 31, 3);
2772 new_val |= bitfield_swap(value, 0, 31);
2773 }
2774
2775 return new_val;
2776}
2777
2778static inline bool evsel__has_branch_counters(const struct evsel *evsel)
2779{
2780 struct evsel *leader = evsel__leader(evsel);
2781
2782 /* The branch counters feature only supports group */
2783 if (!leader || !evsel->evlist)
2784 return false;
2785
2786 if (evsel->evlist->nr_br_cntr < 0)
2787 evlist__update_br_cntr(evsel->evlist);
2788
2789 if (leader->br_cntr_nr > 0)
2790 return true;
2791
2792 return false;
2793}
2794
2795int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
2796 struct perf_sample *data)
2797{
2798 u64 type = evsel->core.attr.sample_type;
2799 bool swapped = evsel->needs_swap;
2800 const __u64 *array;
2801 u16 max_size = event->header.size;
2802 const void *endp = (void *)event + max_size;
2803 u64 sz;
2804
2805 /*
2806 * used for cross-endian analysis. See git commit 65014ab3
2807 * for why this goofiness is needed.
2808 */
2809 union u64_swap u;
2810
2811 memset(data, 0, sizeof(*data));
2812 data->cpu = data->pid = data->tid = -1;
2813 data->stream_id = data->id = data->time = -1ULL;
2814 data->period = evsel->core.attr.sample_period;
2815 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
2816 data->misc = event->header.misc;
2817 data->data_src = PERF_MEM_DATA_SRC_NONE;
2818 data->vcpu = -1;
2819
2820 if (event->header.type != PERF_RECORD_SAMPLE) {
2821 if (!evsel->core.attr.sample_id_all)
2822 return 0;
2823 return perf_evsel__parse_id_sample(evsel, event, data);
2824 }
2825
2826 array = event->sample.array;
2827
2828 if (perf_event__check_size(event, evsel->sample_size))
2829 return -EFAULT;
2830
2831 if (type & PERF_SAMPLE_IDENTIFIER) {
2832 data->id = *array;
2833 array++;
2834 }
2835
2836 if (type & PERF_SAMPLE_IP) {
2837 data->ip = *array;
2838 array++;
2839 }
2840
2841 if (type & PERF_SAMPLE_TID) {
2842 u.val64 = *array;
2843 if (swapped) {
2844 /* undo swap of u64, then swap on individual u32s */
2845 u.val64 = bswap_64(u.val64);
2846 u.val32[0] = bswap_32(u.val32[0]);
2847 u.val32[1] = bswap_32(u.val32[1]);
2848 }
2849
2850 data->pid = u.val32[0];
2851 data->tid = u.val32[1];
2852 array++;
2853 }
2854
2855 if (type & PERF_SAMPLE_TIME) {
2856 data->time = *array;
2857 array++;
2858 }
2859
2860 if (type & PERF_SAMPLE_ADDR) {
2861 data->addr = *array;
2862 array++;
2863 }
2864
2865 if (type & PERF_SAMPLE_ID) {
2866 data->id = *array;
2867 array++;
2868 }
2869
2870 if (type & PERF_SAMPLE_STREAM_ID) {
2871 data->stream_id = *array;
2872 array++;
2873 }
2874
2875 if (type & PERF_SAMPLE_CPU) {
2876
2877 u.val64 = *array;
2878 if (swapped) {
2879 /* undo swap of u64, then swap on individual u32s */
2880 u.val64 = bswap_64(u.val64);
2881 u.val32[0] = bswap_32(u.val32[0]);
2882 }
2883
2884 data->cpu = u.val32[0];
2885 array++;
2886 }
2887
2888 if (type & PERF_SAMPLE_PERIOD) {
2889 data->period = *array;
2890 array++;
2891 }
2892
2893 if (type & PERF_SAMPLE_READ) {
2894 u64 read_format = evsel->core.attr.read_format;
2895
2896 OVERFLOW_CHECK_u64(array);
2897 if (read_format & PERF_FORMAT_GROUP)
2898 data->read.group.nr = *array;
2899 else
2900 data->read.one.value = *array;
2901
2902 array++;
2903
2904 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2905 OVERFLOW_CHECK_u64(array);
2906 data->read.time_enabled = *array;
2907 array++;
2908 }
2909
2910 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2911 OVERFLOW_CHECK_u64(array);
2912 data->read.time_running = *array;
2913 array++;
2914 }
2915
2916 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2917 if (read_format & PERF_FORMAT_GROUP) {
2918 const u64 max_group_nr = UINT64_MAX /
2919 sizeof(struct sample_read_value);
2920
2921 if (data->read.group.nr > max_group_nr)
2922 return -EFAULT;
2923
2924 sz = data->read.group.nr * sample_read_value_size(read_format);
2925 OVERFLOW_CHECK(array, sz, max_size);
2926 data->read.group.values =
2927 (struct sample_read_value *)array;
2928 array = (void *)array + sz;
2929 } else {
2930 OVERFLOW_CHECK_u64(array);
2931 data->read.one.id = *array;
2932 array++;
2933
2934 if (read_format & PERF_FORMAT_LOST) {
2935 OVERFLOW_CHECK_u64(array);
2936 data->read.one.lost = *array;
2937 array++;
2938 }
2939 }
2940 }
2941
2942 if (type & PERF_SAMPLE_CALLCHAIN) {
2943 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
2944
2945 OVERFLOW_CHECK_u64(array);
2946 data->callchain = (struct ip_callchain *)array++;
2947 if (data->callchain->nr > max_callchain_nr)
2948 return -EFAULT;
2949 sz = data->callchain->nr * sizeof(u64);
2950 OVERFLOW_CHECK(array, sz, max_size);
2951 array = (void *)array + sz;
2952 }
2953
2954 if (type & PERF_SAMPLE_RAW) {
2955 OVERFLOW_CHECK_u64(array);
2956 u.val64 = *array;
2957
2958 /*
2959 * Undo swap of u64, then swap on individual u32s,
2960 * get the size of the raw area and undo all of the
2961 * swap. The pevent interface handles endianness by
2962 * itself.
2963 */
2964 if (swapped) {
2965 u.val64 = bswap_64(u.val64);
2966 u.val32[0] = bswap_32(u.val32[0]);
2967 u.val32[1] = bswap_32(u.val32[1]);
2968 }
2969 data->raw_size = u.val32[0];
2970
2971 /*
2972 * The raw data is aligned on 64bits including the
2973 * u32 size, so it's safe to use mem_bswap_64.
2974 */
2975 if (swapped)
2976 mem_bswap_64((void *) array, data->raw_size);
2977
2978 array = (void *)array + sizeof(u32);
2979
2980 OVERFLOW_CHECK(array, data->raw_size, max_size);
2981 data->raw_data = (void *)array;
2982 array = (void *)array + data->raw_size;
2983 }
2984
2985 if (type & PERF_SAMPLE_BRANCH_STACK) {
2986 const u64 max_branch_nr = UINT64_MAX /
2987 sizeof(struct branch_entry);
2988 struct branch_entry *e;
2989 unsigned int i;
2990
2991 OVERFLOW_CHECK_u64(array);
2992 data->branch_stack = (struct branch_stack *)array++;
2993
2994 if (data->branch_stack->nr > max_branch_nr)
2995 return -EFAULT;
2996
2997 sz = data->branch_stack->nr * sizeof(struct branch_entry);
2998 if (evsel__has_branch_hw_idx(evsel)) {
2999 sz += sizeof(u64);
3000 e = &data->branch_stack->entries[0];
3001 } else {
3002 data->no_hw_idx = true;
3003 /*
3004 * if the PERF_SAMPLE_BRANCH_HW_INDEX is not applied,
3005 * only nr and entries[] will be output by kernel.
3006 */
3007 e = (struct branch_entry *)&data->branch_stack->hw_idx;
3008 }
3009
3010 if (swapped) {
3011 /*
3012 * struct branch_flag does not have endian
3013 * specific bit field definition. And bswap
3014 * will not resolve the issue, since these
3015 * are bit fields.
3016 *
3017 * evsel__bitfield_swap_branch_flags() uses a
3018 * bitfield_swap macro to swap the bit position
3019 * based on the host endians.
3020 */
3021 for (i = 0; i < data->branch_stack->nr; i++, e++)
3022 e->flags.value = evsel__bitfield_swap_branch_flags(e->flags.value);
3023 }
3024
3025 OVERFLOW_CHECK(array, sz, max_size);
3026 array = (void *)array + sz;
3027
3028 if (evsel__has_branch_counters(evsel)) {
3029 data->branch_stack_cntr = (u64 *)array;
3030 sz = data->branch_stack->nr * sizeof(u64);
3031
3032 OVERFLOW_CHECK(array, sz, max_size);
3033 array = (void *)array + sz;
3034 }
3035 }
3036
3037 if (type & PERF_SAMPLE_REGS_USER) {
3038 OVERFLOW_CHECK_u64(array);
3039 data->user_regs.abi = *array;
3040 array++;
3041
3042 if (data->user_regs.abi) {
3043 u64 mask = evsel->core.attr.sample_regs_user;
3044
3045 sz = hweight64(mask) * sizeof(u64);
3046 OVERFLOW_CHECK(array, sz, max_size);
3047 data->user_regs.mask = mask;
3048 data->user_regs.regs = (u64 *)array;
3049 array = (void *)array + sz;
3050 }
3051 }
3052
3053 if (type & PERF_SAMPLE_STACK_USER) {
3054 OVERFLOW_CHECK_u64(array);
3055 sz = *array++;
3056
3057 data->user_stack.offset = ((char *)(array - 1)
3058 - (char *) event);
3059
3060 if (!sz) {
3061 data->user_stack.size = 0;
3062 } else {
3063 OVERFLOW_CHECK(array, sz, max_size);
3064 data->user_stack.data = (char *)array;
3065 array = (void *)array + sz;
3066 OVERFLOW_CHECK_u64(array);
3067 data->user_stack.size = *array++;
3068 if (WARN_ONCE(data->user_stack.size > sz,
3069 "user stack dump failure\n"))
3070 return -EFAULT;
3071 }
3072 }
3073
3074 if (type & PERF_SAMPLE_WEIGHT_TYPE) {
3075 OVERFLOW_CHECK_u64(array);
3076 arch_perf_parse_sample_weight(data, array, type);
3077 array++;
3078 }
3079
3080 if (type & PERF_SAMPLE_DATA_SRC) {
3081 OVERFLOW_CHECK_u64(array);
3082 data->data_src = *array;
3083 array++;
3084 }
3085
3086 if (type & PERF_SAMPLE_TRANSACTION) {
3087 OVERFLOW_CHECK_u64(array);
3088 data->transaction = *array;
3089 array++;
3090 }
3091
3092 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
3093 if (type & PERF_SAMPLE_REGS_INTR) {
3094 OVERFLOW_CHECK_u64(array);
3095 data->intr_regs.abi = *array;
3096 array++;
3097
3098 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
3099 u64 mask = evsel->core.attr.sample_regs_intr;
3100
3101 sz = hweight64(mask) * sizeof(u64);
3102 OVERFLOW_CHECK(array, sz, max_size);
3103 data->intr_regs.mask = mask;
3104 data->intr_regs.regs = (u64 *)array;
3105 array = (void *)array + sz;
3106 }
3107 }
3108
3109 data->phys_addr = 0;
3110 if (type & PERF_SAMPLE_PHYS_ADDR) {
3111 data->phys_addr = *array;
3112 array++;
3113 }
3114
3115 data->cgroup = 0;
3116 if (type & PERF_SAMPLE_CGROUP) {
3117 data->cgroup = *array;
3118 array++;
3119 }
3120
3121 data->data_page_size = 0;
3122 if (type & PERF_SAMPLE_DATA_PAGE_SIZE) {
3123 data->data_page_size = *array;
3124 array++;
3125 }
3126
3127 data->code_page_size = 0;
3128 if (type & PERF_SAMPLE_CODE_PAGE_SIZE) {
3129 data->code_page_size = *array;
3130 array++;
3131 }
3132
3133 if (type & PERF_SAMPLE_AUX) {
3134 OVERFLOW_CHECK_u64(array);
3135 sz = *array++;
3136
3137 OVERFLOW_CHECK(array, sz, max_size);
3138 /* Undo swap of data */
3139 if (swapped)
3140 mem_bswap_64((char *)array, sz);
3141 data->aux_sample.size = sz;
3142 data->aux_sample.data = (char *)array;
3143 array = (void *)array + sz;
3144 }
3145
3146 return 0;
3147}
3148
3149int evsel__parse_sample_timestamp(struct evsel *evsel, union perf_event *event,
3150 u64 *timestamp)
3151{
3152 u64 type = evsel->core.attr.sample_type;
3153 const __u64 *array;
3154
3155 if (!(type & PERF_SAMPLE_TIME))
3156 return -1;
3157
3158 if (event->header.type != PERF_RECORD_SAMPLE) {
3159 struct perf_sample data = {
3160 .time = -1ULL,
3161 };
3162
3163 if (!evsel->core.attr.sample_id_all)
3164 return -1;
3165 if (perf_evsel__parse_id_sample(evsel, event, &data))
3166 return -1;
3167
3168 *timestamp = data.time;
3169 return 0;
3170 }
3171
3172 array = event->sample.array;
3173
3174 if (perf_event__check_size(event, evsel->sample_size))
3175 return -EFAULT;
3176
3177 if (type & PERF_SAMPLE_IDENTIFIER)
3178 array++;
3179
3180 if (type & PERF_SAMPLE_IP)
3181 array++;
3182
3183 if (type & PERF_SAMPLE_TID)
3184 array++;
3185
3186 if (type & PERF_SAMPLE_TIME)
3187 *timestamp = *array;
3188
3189 return 0;
3190}
3191
3192u16 evsel__id_hdr_size(const struct evsel *evsel)
3193{
3194 u64 sample_type = evsel->core.attr.sample_type;
3195 u16 size = 0;
3196
3197 if (sample_type & PERF_SAMPLE_TID)
3198 size += sizeof(u64);
3199
3200 if (sample_type & PERF_SAMPLE_TIME)
3201 size += sizeof(u64);
3202
3203 if (sample_type & PERF_SAMPLE_ID)
3204 size += sizeof(u64);
3205
3206 if (sample_type & PERF_SAMPLE_STREAM_ID)
3207 size += sizeof(u64);
3208
3209 if (sample_type & PERF_SAMPLE_CPU)
3210 size += sizeof(u64);
3211
3212 if (sample_type & PERF_SAMPLE_IDENTIFIER)
3213 size += sizeof(u64);
3214
3215 return size;
3216}
3217
3218#ifdef HAVE_LIBTRACEEVENT
3219struct tep_format_field *evsel__field(struct evsel *evsel, const char *name)
3220{
3221 return tep_find_field(evsel->tp_format, name);
3222}
3223
3224struct tep_format_field *evsel__common_field(struct evsel *evsel, const char *name)
3225{
3226 return tep_find_common_field(evsel->tp_format, name);
3227}
3228
3229void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char *name)
3230{
3231 struct tep_format_field *field = evsel__field(evsel, name);
3232 int offset;
3233
3234 if (!field)
3235 return NULL;
3236
3237 offset = field->offset;
3238
3239 if (field->flags & TEP_FIELD_IS_DYNAMIC) {
3240 offset = *(int *)(sample->raw_data + field->offset);
3241 offset &= 0xffff;
3242 if (tep_field_is_relative(field->flags))
3243 offset += field->offset + field->size;
3244 }
3245
3246 return sample->raw_data + offset;
3247}
3248
3249u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample,
3250 bool needs_swap)
3251{
3252 u64 value;
3253 void *ptr = sample->raw_data + field->offset;
3254
3255 switch (field->size) {
3256 case 1:
3257 return *(u8 *)ptr;
3258 case 2:
3259 value = *(u16 *)ptr;
3260 break;
3261 case 4:
3262 value = *(u32 *)ptr;
3263 break;
3264 case 8:
3265 memcpy(&value, ptr, sizeof(u64));
3266 break;
3267 default:
3268 return 0;
3269 }
3270
3271 if (!needs_swap)
3272 return value;
3273
3274 switch (field->size) {
3275 case 2:
3276 return bswap_16(value);
3277 case 4:
3278 return bswap_32(value);
3279 case 8:
3280 return bswap_64(value);
3281 default:
3282 return 0;
3283 }
3284
3285 return 0;
3286}
3287
3288u64 evsel__intval(struct evsel *evsel, struct perf_sample *sample, const char *name)
3289{
3290 struct tep_format_field *field = evsel__field(evsel, name);
3291
3292 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
3293}
3294
3295u64 evsel__intval_common(struct evsel *evsel, struct perf_sample *sample, const char *name)
3296{
3297 struct tep_format_field *field = evsel__common_field(evsel, name);
3298
3299 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
3300}
3301
3302char evsel__taskstate(struct evsel *evsel, struct perf_sample *sample, const char *name)
3303{
3304 static struct tep_format_field *prev_state_field;
3305 static const char *states;
3306 struct tep_format_field *field;
3307 unsigned long long val;
3308 unsigned int bit;
3309 char state = '?'; /* '?' denotes unknown task state */
3310
3311 field = evsel__field(evsel, name);
3312
3313 if (!field)
3314 return state;
3315
3316 if (!states || field != prev_state_field) {
3317 states = parse_task_states(field);
3318 if (!states)
3319 return state;
3320 prev_state_field = field;
3321 }
3322
3323 /*
3324 * Note since the kernel exposes TASK_REPORT_MAX to userspace
3325 * to denote the 'preempted' state, we might as welll report
3326 * 'R' for this case, which make senses to users as well.
3327 *
3328 * We can change this if we have a good reason in the future.
3329 */
3330 val = evsel__intval(evsel, sample, name);
3331 bit = val ? ffs(val) : 0;
3332 state = (!bit || bit > strlen(states)) ? 'R' : states[bit-1];
3333 return state;
3334}
3335#endif
3336
3337bool evsel__fallback(struct evsel *evsel, struct target *target, int err,
3338 char *msg, size_t msgsize)
3339{
3340 int paranoid;
3341
3342 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
3343 evsel->core.attr.type == PERF_TYPE_HARDWARE &&
3344 evsel->core.attr.config == PERF_COUNT_HW_CPU_CYCLES) {
3345 /*
3346 * If it's cycles then fall back to hrtimer based cpu-clock sw
3347 * counter, which is always available even if no PMU support.
3348 *
3349 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
3350 * b0a873e).
3351 */
3352 evsel->core.attr.type = PERF_TYPE_SOFTWARE;
3353 evsel->core.attr.config = target__has_cpu(target)
3354 ? PERF_COUNT_SW_CPU_CLOCK
3355 : PERF_COUNT_SW_TASK_CLOCK;
3356 scnprintf(msg, msgsize,
3357 "The cycles event is not supported, trying to fall back to %s",
3358 target__has_cpu(target) ? "cpu-clock" : "task-clock");
3359
3360 zfree(&evsel->name);
3361 return true;
3362 } else if (err == EACCES && !evsel->core.attr.exclude_kernel &&
3363 (paranoid = perf_event_paranoid()) > 1) {
3364 const char *name = evsel__name(evsel);
3365 char *new_name;
3366 const char *sep = ":";
3367
3368 /* If event has exclude user then don't exclude kernel. */
3369 if (evsel->core.attr.exclude_user)
3370 return false;
3371
3372 /* Is there already the separator in the name. */
3373 if (strchr(name, '/') ||
3374 (strchr(name, ':') && !evsel->is_libpfm_event))
3375 sep = "";
3376
3377 if (asprintf(&new_name, "%s%su", name, sep) < 0)
3378 return false;
3379
3380 free(evsel->name);
3381 evsel->name = new_name;
3382 scnprintf(msg, msgsize, "kernel.perf_event_paranoid=%d, trying "
3383 "to fall back to excluding kernel and hypervisor "
3384 " samples", paranoid);
3385 evsel->core.attr.exclude_kernel = 1;
3386 evsel->core.attr.exclude_hv = 1;
3387
3388 return true;
3389 } else if (err == EOPNOTSUPP && !evsel->core.attr.exclude_guest &&
3390 !evsel->exclude_GH) {
3391 const char *name = evsel__name(evsel);
3392 char *new_name;
3393 const char *sep = ":";
3394
3395 /* Is there already the separator in the name. */
3396 if (strchr(name, '/') ||
3397 (strchr(name, ':') && !evsel->is_libpfm_event))
3398 sep = "";
3399
3400 if (asprintf(&new_name, "%s%sH", name, sep) < 0)
3401 return false;
3402
3403 free(evsel->name);
3404 evsel->name = new_name;
3405 /* Apple M1 requires exclude_guest */
3406 scnprintf(msg, msgsize, "trying to fall back to excluding guest samples");
3407 evsel->core.attr.exclude_guest = 1;
3408
3409 return true;
3410 }
3411
3412 return false;
3413}
3414
3415static bool find_process(const char *name)
3416{
3417 size_t len = strlen(name);
3418 DIR *dir;
3419 struct dirent *d;
3420 int ret = -1;
3421
3422 dir = opendir(procfs__mountpoint());
3423 if (!dir)
3424 return false;
3425
3426 /* Walk through the directory. */
3427 while (ret && (d = readdir(dir)) != NULL) {
3428 char path[PATH_MAX];
3429 char *data;
3430 size_t size;
3431
3432 if ((d->d_type != DT_DIR) ||
3433 !strcmp(".", d->d_name) ||
3434 !strcmp("..", d->d_name))
3435 continue;
3436
3437 scnprintf(path, sizeof(path), "%s/%s/comm",
3438 procfs__mountpoint(), d->d_name);
3439
3440 if (filename__read_str(path, &data, &size))
3441 continue;
3442
3443 ret = strncmp(name, data, len);
3444 free(data);
3445 }
3446
3447 closedir(dir);
3448 return ret ? false : true;
3449}
3450
3451int __weak arch_evsel__open_strerror(struct evsel *evsel __maybe_unused,
3452 char *msg __maybe_unused,
3453 size_t size __maybe_unused)
3454{
3455 return 0;
3456}
3457
3458int evsel__open_strerror(struct evsel *evsel, struct target *target,
3459 int err, char *msg, size_t size)
3460{
3461 char sbuf[STRERR_BUFSIZE];
3462 int printed = 0, enforced = 0;
3463 int ret;
3464
3465 switch (err) {
3466 case EPERM:
3467 case EACCES:
3468 printed += scnprintf(msg + printed, size - printed,
3469 "Access to performance monitoring and observability operations is limited.\n");
3470
3471 if (!sysfs__read_int("fs/selinux/enforce", &enforced)) {
3472 if (enforced) {
3473 printed += scnprintf(msg + printed, size - printed,
3474 "Enforced MAC policy settings (SELinux) can limit access to performance\n"
3475 "monitoring and observability operations. Inspect system audit records for\n"
3476 "more perf_event access control information and adjusting the policy.\n");
3477 }
3478 }
3479
3480 if (err == EPERM)
3481 printed += scnprintf(msg, size,
3482 "No permission to enable %s event.\n\n", evsel__name(evsel));
3483
3484 return scnprintf(msg + printed, size - printed,
3485 "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n"
3486 "access to performance monitoring and observability operations for processes\n"
3487 "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n"
3488 "More information can be found at 'Perf events and tool security' document:\n"
3489 "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n"
3490 "perf_event_paranoid setting is %d:\n"
3491 " -1: Allow use of (almost) all events by all users\n"
3492 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
3493 ">= 0: Disallow raw and ftrace function tracepoint access\n"
3494 ">= 1: Disallow CPU event access\n"
3495 ">= 2: Disallow kernel profiling\n"
3496 "To make the adjusted perf_event_paranoid setting permanent preserve it\n"
3497 "in /etc/sysctl.conf (e.g. kernel.perf_event_paranoid = <setting>)",
3498 perf_event_paranoid());
3499 case ENOENT:
3500 return scnprintf(msg, size, "The %s event is not supported.", evsel__name(evsel));
3501 case EMFILE:
3502 return scnprintf(msg, size, "%s",
3503 "Too many events are opened.\n"
3504 "Probably the maximum number of open file descriptors has been reached.\n"
3505 "Hint: Try again after reducing the number of events.\n"
3506 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
3507 case ENOMEM:
3508 if (evsel__has_callchain(evsel) &&
3509 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
3510 return scnprintf(msg, size,
3511 "Not enough memory to setup event with callchain.\n"
3512 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
3513 "Hint: Current value: %d", sysctl__max_stack());
3514 break;
3515 case ENODEV:
3516 if (target->cpu_list)
3517 return scnprintf(msg, size, "%s",
3518 "No such device - did you specify an out-of-range profile CPU?");
3519 break;
3520 case EOPNOTSUPP:
3521 if (evsel->core.attr.sample_type & PERF_SAMPLE_BRANCH_STACK)
3522 return scnprintf(msg, size,
3523 "%s: PMU Hardware or event type doesn't support branch stack sampling.",
3524 evsel__name(evsel));
3525 if (evsel->core.attr.aux_output)
3526 return scnprintf(msg, size,
3527 "%s: PMU Hardware doesn't support 'aux_output' feature",
3528 evsel__name(evsel));
3529 if (evsel->core.attr.sample_period != 0)
3530 return scnprintf(msg, size,
3531 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
3532 evsel__name(evsel));
3533 if (evsel->core.attr.precise_ip)
3534 return scnprintf(msg, size, "%s",
3535 "\'precise\' request may not be supported. Try removing 'p' modifier.");
3536#if defined(__i386__) || defined(__x86_64__)
3537 if (evsel->core.attr.type == PERF_TYPE_HARDWARE)
3538 return scnprintf(msg, size, "%s",
3539 "No hardware sampling interrupt available.\n");
3540#endif
3541 break;
3542 case EBUSY:
3543 if (find_process("oprofiled"))
3544 return scnprintf(msg, size,
3545 "The PMU counters are busy/taken by another profiler.\n"
3546 "We found oprofile daemon running, please stop it and try again.");
3547 break;
3548 case EINVAL:
3549 if (evsel->core.attr.sample_type & PERF_SAMPLE_CODE_PAGE_SIZE && perf_missing_features.code_page_size)
3550 return scnprintf(msg, size, "Asking for the code page size isn't supported by this kernel.");
3551 if (evsel->core.attr.sample_type & PERF_SAMPLE_DATA_PAGE_SIZE && perf_missing_features.data_page_size)
3552 return scnprintf(msg, size, "Asking for the data page size isn't supported by this kernel.");
3553 if (evsel->core.attr.write_backward && perf_missing_features.write_backward)
3554 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
3555 if (perf_missing_features.clockid)
3556 return scnprintf(msg, size, "clockid feature not supported.");
3557 if (perf_missing_features.clockid_wrong)
3558 return scnprintf(msg, size, "wrong clockid (%d).", clockid);
3559 if (perf_missing_features.aux_output)
3560 return scnprintf(msg, size, "The 'aux_output' feature is not supported, update the kernel.");
3561 if (!target__has_cpu(target))
3562 return scnprintf(msg, size,
3563 "Invalid event (%s) in per-thread mode, enable system wide with '-a'.",
3564 evsel__name(evsel));
3565
3566 break;
3567 case ENODATA:
3568 return scnprintf(msg, size, "Cannot collect data source with the load latency event alone. "
3569 "Please add an auxiliary event in front of the load latency event.");
3570 default:
3571 break;
3572 }
3573
3574 ret = arch_evsel__open_strerror(evsel, msg, size);
3575 if (ret)
3576 return ret;
3577
3578 return scnprintf(msg, size,
3579 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
3580 "\"dmesg | grep -i perf\" may provide additional information.\n",
3581 err, str_error_r(err, sbuf, sizeof(sbuf)), evsel__name(evsel));
3582}
3583
3584struct perf_env *evsel__env(struct evsel *evsel)
3585{
3586 if (evsel && evsel->evlist && evsel->evlist->env)
3587 return evsel->evlist->env;
3588 return &perf_env;
3589}
3590
3591static int store_evsel_ids(struct evsel *evsel, struct evlist *evlist)
3592{
3593 int cpu_map_idx, thread;
3594
3595 if (evsel__is_retire_lat(evsel))
3596 return 0;
3597
3598 for (cpu_map_idx = 0; cpu_map_idx < xyarray__max_x(evsel->core.fd); cpu_map_idx++) {
3599 for (thread = 0; thread < xyarray__max_y(evsel->core.fd);
3600 thread++) {
3601 int fd = FD(evsel, cpu_map_idx, thread);
3602
3603 if (perf_evlist__id_add_fd(&evlist->core, &evsel->core,
3604 cpu_map_idx, thread, fd) < 0)
3605 return -1;
3606 }
3607 }
3608
3609 return 0;
3610}
3611
3612int evsel__store_ids(struct evsel *evsel, struct evlist *evlist)
3613{
3614 struct perf_cpu_map *cpus = evsel->core.cpus;
3615 struct perf_thread_map *threads = evsel->core.threads;
3616
3617 if (perf_evsel__alloc_id(&evsel->core, perf_cpu_map__nr(cpus), threads->nr))
3618 return -ENOMEM;
3619
3620 return store_evsel_ids(evsel, evlist);
3621}
3622
3623void evsel__zero_per_pkg(struct evsel *evsel)
3624{
3625 struct hashmap_entry *cur;
3626 size_t bkt;
3627
3628 if (evsel->per_pkg_mask) {
3629 hashmap__for_each_entry(evsel->per_pkg_mask, cur, bkt)
3630 zfree(&cur->pkey);
3631
3632 hashmap__clear(evsel->per_pkg_mask);
3633 }
3634}
3635
3636/**
3637 * evsel__is_hybrid - does the evsel have a known PMU that is hybrid. Note, this
3638 * will be false on hybrid systems for hardware and legacy
3639 * cache events.
3640 */
3641bool evsel__is_hybrid(const struct evsel *evsel)
3642{
3643 if (perf_pmus__num_core_pmus() == 1)
3644 return false;
3645
3646 return evsel->core.is_pmu_core;
3647}
3648
3649struct evsel *evsel__leader(const struct evsel *evsel)
3650{
3651 return container_of(evsel->core.leader, struct evsel, core);
3652}
3653
3654bool evsel__has_leader(struct evsel *evsel, struct evsel *leader)
3655{
3656 return evsel->core.leader == &leader->core;
3657}
3658
3659bool evsel__is_leader(struct evsel *evsel)
3660{
3661 return evsel__has_leader(evsel, evsel);
3662}
3663
3664void evsel__set_leader(struct evsel *evsel, struct evsel *leader)
3665{
3666 evsel->core.leader = &leader->core;
3667}
3668
3669int evsel__source_count(const struct evsel *evsel)
3670{
3671 struct evsel *pos;
3672 int count = 0;
3673
3674 evlist__for_each_entry(evsel->evlist, pos) {
3675 if (pos->metric_leader == evsel)
3676 count++;
3677 }
3678 return count;
3679}
3680
3681bool __weak arch_evsel__must_be_in_group(const struct evsel *evsel __maybe_unused)
3682{
3683 return false;
3684}
3685
3686/*
3687 * Remove an event from a given group (leader).
3688 * Some events, e.g., perf metrics Topdown events,
3689 * must always be grouped. Ignore the events.
3690 */
3691void evsel__remove_from_group(struct evsel *evsel, struct evsel *leader)
3692{
3693 if (!arch_evsel__must_be_in_group(evsel) && evsel != leader) {
3694 evsel__set_leader(evsel, evsel);
3695 evsel->core.nr_members = 0;
3696 leader->core.nr_members--;
3697 }
3698}