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perf tools: Expand perf_event__synthesize_sample()
[linux-2.6-block.git] / tools / perf / util / evsel.c
CommitLineData
f8a95309
ACM		 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
936be503 10#include <byteswap.h>
0f6a3015 11#include <linux/bitops.h>
85c66be1 12#include <lk/debugfs.h>
4e319027
RR		 13#include <traceevent/event-parse.h>
14#include <linux/hw_breakpoint.h>
15#include <linux/perf_event.h>
bec19672 16#include <sys/resource.h>
4e319027 17#include "asm/bug.h"
69aad6f1 18#include "evsel.h"
70082dd9 19#include "evlist.h"
69aad6f1 20#include "util.h"
86bd5e86 21#include "cpumap.h"
fd78260b 22#include "thread_map.h"
12864b31 23#include "target.h"
26d33022 24#include "perf_regs.h"
e3e1a54f 25#include "debug.h"
69aad6f1 26
594ac61a
ACM		 27static struct {
28 bool sample_id_all;
29 bool exclude_guest;
30} perf_missing_features;
31
c52b12ed
ACM		 32#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
33
75562573 34int __perf_evsel__sample_size(u64 sample_type)
c2a70653
ACM		 35{
36 u64 mask = sample_type & PERF_SAMPLE_MASK;
37 int size = 0;
38 int i;
39
40 for (i = 0; i < 64; i++) {
41 if (mask & (1ULL << i))
42 size++;
43 }
44
45 size *= sizeof(u64);
46
47 return size;
48}
49
75562573
AH		 50/**
51 * __perf_evsel__calc_id_pos - calculate id_pos.
52 * @sample_type: sample type
53 *
54 * This function returns the position of the event id (PERF_SAMPLE_ID or
55 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
56 * sample_event.
57 */
58static int __perf_evsel__calc_id_pos(u64 sample_type)
59{
60 int idx = 0;
61
62 if (sample_type & PERF_SAMPLE_IDENTIFIER)
63 return 0;
64
65 if (!(sample_type & PERF_SAMPLE_ID))
66 return -1;
67
68 if (sample_type & PERF_SAMPLE_IP)
69 idx += 1;
70
71 if (sample_type & PERF_SAMPLE_TID)
72 idx += 1;
73
74 if (sample_type & PERF_SAMPLE_TIME)
75 idx += 1;
76
77 if (sample_type & PERF_SAMPLE_ADDR)
78 idx += 1;
79
80 return idx;
81}
82
83/**
84 * __perf_evsel__calc_is_pos - calculate is_pos.
85 * @sample_type: sample type
86 *
87 * This function returns the position (counting backwards) of the event id
88 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
89 * sample_id_all is used there is an id sample appended to non-sample events.
90 */
91static int __perf_evsel__calc_is_pos(u64 sample_type)
92{
93 int idx = 1;
94
95 if (sample_type & PERF_SAMPLE_IDENTIFIER)
96 return 1;
97
98 if (!(sample_type & PERF_SAMPLE_ID))
99 return -1;
100
101 if (sample_type & PERF_SAMPLE_CPU)
102 idx += 1;
103
104 if (sample_type & PERF_SAMPLE_STREAM_ID)
105 idx += 1;
106
107 return idx;
108}
109
110void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
111{
112 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
113 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
114}
115
4bf9ce1b 116void hists__init(struct hists *hists)
0e2a5f10
ACM		 117{
118 memset(hists, 0, sizeof(*hists));
119 hists->entries_in_array[0] = hists->entries_in_array[1] = RB_ROOT;
120 hists->entries_in = &hists->entries_in_array[0];
121 hists->entries_collapsed = RB_ROOT;
122 hists->entries = RB_ROOT;
123 pthread_mutex_init(&hists->lock, NULL);
124}
125
7be5ebe8
ACM		 126void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
127 enum perf_event_sample_format bit)
128{
129 if (!(evsel->attr.sample_type & bit)) {
130 evsel->attr.sample_type |= bit;
131 evsel->sample_size += sizeof(u64);
75562573 132 perf_evsel__calc_id_pos(evsel);
7be5ebe8
ACM		 133 }
134}
135
136void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
137 enum perf_event_sample_format bit)
138{
139 if (evsel->attr.sample_type & bit) {
140 evsel->attr.sample_type &= ~bit;
141 evsel->sample_size -= sizeof(u64);
75562573 142 perf_evsel__calc_id_pos(evsel);
7be5ebe8
ACM		 143 }
144}
145
75562573
AH		 146void perf_evsel__set_sample_id(struct perf_evsel *evsel,
147 bool can_sample_identifier)
7a5a5ca5 148{
75562573
AH		 149 if (can_sample_identifier) {
150 perf_evsel__reset_sample_bit(evsel, ID);
151 perf_evsel__set_sample_bit(evsel, IDENTIFIER);
152 } else {
153 perf_evsel__set_sample_bit(evsel, ID);
154 }
7a5a5ca5
ACM		 155 evsel->attr.read_format |= PERF_FORMAT_ID;
156}
157
ef1d1af2
ACM		 158void perf_evsel__init(struct perf_evsel *evsel,
159 struct perf_event_attr *attr, int idx)
160{
161 evsel->idx = idx;
162 evsel->attr = *attr;
2cfda562 163 evsel->leader = evsel;
ef1d1af2 164 INIT_LIST_HEAD(&evsel->node);
1980c2eb 165 hists__init(&evsel->hists);
bde09467 166 evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
75562573 167 perf_evsel__calc_id_pos(evsel);
ef1d1af2
ACM		 168}
169
23a2f3ab 170struct perf_evsel *perf_evsel__new(struct perf_event_attr *attr, int idx)
69aad6f1
ACM		 171{
172 struct perf_evsel *evsel = zalloc(sizeof(*evsel));
173
ef1d1af2
ACM		 174 if (evsel != NULL)
175 perf_evsel__init(evsel, attr, idx);
69aad6f1
ACM		 176
177 return evsel;
178}
179
201b7334 180struct event_format *event_format__new(const char *sys, const char *name)
efd2b924
ACM		 181{
182 int fd, n;
183 char *filename;
184 void *bf = NULL, *nbf;
185 size_t size = 0, alloc_size = 0;
186 struct event_format *format = NULL;
187
188 if (asprintf(&filename, "%s/%s/%s/format", tracing_events_path, sys, name) < 0)
189 goto out;
190
191 fd = open(filename, O_RDONLY);
192 if (fd < 0)
193 goto out_free_filename;
194
195 do {
196 if (size == alloc_size) {
197 alloc_size += BUFSIZ;
198 nbf = realloc(bf, alloc_size);
199 if (nbf == NULL)
200 goto out_free_bf;
201 bf = nbf;
202 }
203
7cab84e8 204 n = read(fd, bf + size, alloc_size - size);
efd2b924
ACM		 205 if (n < 0)
206 goto out_free_bf;
207 size += n;
208 } while (n > 0);
209
210 pevent_parse_format(&format, bf, size, sys);
211
212out_free_bf:
213 free(bf);
214 close(fd);
215out_free_filename:
216 free(filename);
217out:
218 return format;
219}
220
221struct perf_evsel *perf_evsel__newtp(const char *sys, const char *name, int idx)
222{
223 struct perf_evsel *evsel = zalloc(sizeof(*evsel));
224
225 if (evsel != NULL) {
226 struct perf_event_attr attr = {
0b80f8b3
ACM		 227 .type = PERF_TYPE_TRACEPOINT,
228 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
229 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
efd2b924
ACM		 230 };
231
e48ffe2b
ACM		 232 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
233 goto out_free;
234
efd2b924
ACM		 235 evsel->tp_format = event_format__new(sys, name);
236 if (evsel->tp_format == NULL)
237 goto out_free;
238
0b80f8b3 239 event_attr_init(&attr);
efd2b924 240 attr.config = evsel->tp_format->id;
0b80f8b3 241 attr.sample_period = 1;
efd2b924 242 perf_evsel__init(evsel, &attr, idx);
efd2b924
ACM		 243 }
244
245 return evsel;
246
247out_free:
e48ffe2b 248 free(evsel->name);
efd2b924
ACM		 249 free(evsel);
250 return NULL;
251}
252
8ad7013b 253const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
c410431c
ACM		 254 "cycles",
255 "instructions",
256 "cache-references",
257 "cache-misses",
258 "branches",
259 "branch-misses",
260 "bus-cycles",
261 "stalled-cycles-frontend",
262 "stalled-cycles-backend",
263 "ref-cycles",
264};
265
dd4f5223 266static const char *__perf_evsel__hw_name(u64 config)
c410431c
ACM		 267{
268 if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
269 return perf_evsel__hw_names[config];
270
271 return "unknown-hardware";
272}
273
27f18617 274static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
c410431c 275{
27f18617 276 int colon = 0, r = 0;
c410431c 277 struct perf_event_attr *attr = &evsel->attr;
c410431c
ACM		 278 bool exclude_guest_default = false;
279
280#define MOD_PRINT(context, mod) do { \
281 if (!attr->exclude_##context) { \
27f18617 282 if (!colon) colon = ++r; \
c410431c
ACM		 283 r += scnprintf(bf + r, size - r, "%c", mod); \
284 } } while(0)
285
286 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
287 MOD_PRINT(kernel, 'k');
288 MOD_PRINT(user, 'u');
289 MOD_PRINT(hv, 'h');
290 exclude_guest_default = true;
291 }
292
293 if (attr->precise_ip) {
294 if (!colon)
27f18617 295 colon = ++r;
c410431c
ACM		 296 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
297 exclude_guest_default = true;
298 }
299
300 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
301 MOD_PRINT(host, 'H');
302 MOD_PRINT(guest, 'G');
303 }
304#undef MOD_PRINT
305 if (colon)
27f18617 306 bf[colon - 1] = ':';
c410431c
ACM		 307 return r;
308}
309
27f18617
ACM		 310static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
311{
312 int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
313 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
314}
315
8ad7013b 316const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
335c2f5d
ACM		 317 "cpu-clock",
318 "task-clock",
319 "page-faults",
320 "context-switches",
8ad7013b 321 "cpu-migrations",
335c2f5d
ACM		 322 "minor-faults",
323 "major-faults",
324 "alignment-faults",
325 "emulation-faults",
326};
327
dd4f5223 328static const char *__perf_evsel__sw_name(u64 config)
335c2f5d
ACM		 329{
330 if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
331 return perf_evsel__sw_names[config];
332 return "unknown-software";
333}
334
335static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
336{
337 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
338 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
339}
340
287e74aa
JO		 341static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
342{
343 int r;
344
345 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
346
347 if (type & HW_BREAKPOINT_R)
348 r += scnprintf(bf + r, size - r, "r");
349
350 if (type & HW_BREAKPOINT_W)
351 r += scnprintf(bf + r, size - r, "w");
352
353 if (type & HW_BREAKPOINT_X)
354 r += scnprintf(bf + r, size - r, "x");
355
356 return r;
357}
358
359static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
360{
361 struct perf_event_attr *attr = &evsel->attr;
362 int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
363 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
364}
365
0b668bc9
ACM		 366const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
367 [PERF_EVSEL__MAX_ALIASES] = {
368 { "L1-dcache", "l1-d", "l1d", "L1-data", },
369 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
370 { "LLC", "L2", },
371 { "dTLB", "d-tlb", "Data-TLB", },
372 { "iTLB", "i-tlb", "Instruction-TLB", },
373 { "branch", "branches", "bpu", "btb", "bpc", },
374 { "node", },
375};
376
377const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
378 [PERF_EVSEL__MAX_ALIASES] = {
379 { "load", "loads", "read", },
380 { "store", "stores", "write", },
381 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
382};
383
384const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
385 [PERF_EVSEL__MAX_ALIASES] = {
386 { "refs", "Reference", "ops", "access", },
387 { "misses", "miss", },
388};
389
390#define C(x) PERF_COUNT_HW_CACHE_##x
391#define CACHE_READ (1 << C(OP_READ))
392#define CACHE_WRITE (1 << C(OP_WRITE))
393#define CACHE_PREFETCH (1 << C(OP_PREFETCH))
394#define COP(x) (1 << x)
395
396/*
397 * cache operartion stat
398 * L1I : Read and prefetch only
399 * ITLB and BPU : Read-only
400 */
401static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
402 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
403 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
404 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
405 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
406 [C(ITLB)] = (CACHE_READ),
407 [C(BPU)] = (CACHE_READ),
408 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
409};
410
411bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
412{
413 if (perf_evsel__hw_cache_stat[type] & COP(op))
414 return true; /* valid */
415 else
416 return false; /* invalid */
417}
418
419int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
420 char *bf, size_t size)
421{
422 if (result) {
423 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
424 perf_evsel__hw_cache_op[op][0],
425 perf_evsel__hw_cache_result[result][0]);
426 }
427
428 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
429 perf_evsel__hw_cache_op[op][1]);
430}
431
dd4f5223 432static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
0b668bc9
ACM		 433{
434 u8 op, result, type = (config >> 0) & 0xff;
435 const char *err = "unknown-ext-hardware-cache-type";
436
437 if (type > PERF_COUNT_HW_CACHE_MAX)
438 goto out_err;
439
440 op = (config >> 8) & 0xff;
441 err = "unknown-ext-hardware-cache-op";
442 if (op > PERF_COUNT_HW_CACHE_OP_MAX)
443 goto out_err;
444
445 result = (config >> 16) & 0xff;
446 err = "unknown-ext-hardware-cache-result";
447 if (result > PERF_COUNT_HW_CACHE_RESULT_MAX)
448 goto out_err;
449
450 err = "invalid-cache";
451 if (!perf_evsel__is_cache_op_valid(type, op))
452 goto out_err;
453
454 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
455out_err:
456 return scnprintf(bf, size, "%s", err);
457}
458
459static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
460{
461 int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
462 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
463}
464
6eef3d9c
ACM		 465static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
466{
467 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
468 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
469}
470
7289f83c 471const char *perf_evsel__name(struct perf_evsel *evsel)
a4460836 472{
7289f83c 473 char bf[128];
a4460836 474
7289f83c
ACM		 475 if (evsel->name)
476 return evsel->name;
c410431c
ACM		 477
478 switch (evsel->attr.type) {
479 case PERF_TYPE_RAW:
6eef3d9c 480 perf_evsel__raw_name(evsel, bf, sizeof(bf));
c410431c
ACM		 481 break;
482
483 case PERF_TYPE_HARDWARE:
7289f83c 484 perf_evsel__hw_name(evsel, bf, sizeof(bf));
c410431c 485 break;
0b668bc9
ACM		 486
487 case PERF_TYPE_HW_CACHE:
7289f83c 488 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
0b668bc9
ACM		 489 break;
490
335c2f5d 491 case PERF_TYPE_SOFTWARE:
7289f83c 492 perf_evsel__sw_name(evsel, bf, sizeof(bf));
335c2f5d
ACM		 493 break;
494
a4460836 495 case PERF_TYPE_TRACEPOINT:
7289f83c 496 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
a4460836
ACM		 497 break;
498
287e74aa
JO		 499 case PERF_TYPE_BREAKPOINT:
500 perf_evsel__bp_name(evsel, bf, sizeof(bf));
501 break;
502
c410431c 503 default:
ca1b1457
RR		 504 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
505 evsel->attr.type);
a4460836 506 break;
c410431c
ACM		 507 }
508
7289f83c
ACM		 509 evsel->name = strdup(bf);
510
511 return evsel->name ?: "unknown";
c410431c
ACM		 512}
513
717e263f
NK		 514const char *perf_evsel__group_name(struct perf_evsel *evsel)
515{
516 return evsel->group_name ?: "anon group";
517}
518
519int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
520{
521 int ret;
522 struct perf_evsel *pos;
523 const char *group_name = perf_evsel__group_name(evsel);
524
525 ret = scnprintf(buf, size, "%s", group_name);
526
527 ret += scnprintf(buf + ret, size - ret, " { %s",
528 perf_evsel__name(evsel));
529
530 for_each_group_member(pos, evsel)
531 ret += scnprintf(buf + ret, size - ret, ", %s",
532 perf_evsel__name(pos));
533
534 ret += scnprintf(buf + ret, size - ret, " }");
535
536 return ret;
537}
538
774cb499
JO		 539/*
540 * The enable_on_exec/disabled value strategy:
541 *
542 * 1) For any type of traced program:
543 * - all independent events and group leaders are disabled
544 * - all group members are enabled
545 *
546 * Group members are ruled by group leaders. They need to
547 * be enabled, because the group scheduling relies on that.
548 *
549 * 2) For traced programs executed by perf:
550 * - all independent events and group leaders have
551 * enable_on_exec set
552 * - we don't specifically enable or disable any event during
553 * the record command
554 *
555 * Independent events and group leaders are initially disabled
556 * and get enabled by exec. Group members are ruled by group
557 * leaders as stated in 1).
558 *
559 * 3) For traced programs attached by perf (pid/tid):
560 * - we specifically enable or disable all events during
561 * the record command
562 *
563 * When attaching events to already running traced we
564 * enable/disable events specifically, as there's no
565 * initial traced exec call.
566 */
cac21425
JO		 567void perf_evsel__config(struct perf_evsel *evsel,
568 struct perf_record_opts *opts)
0f82ebc4 569{
3c176311 570 struct perf_evsel *leader = evsel->leader;
0f82ebc4
ACM		 571 struct perf_event_attr *attr = &evsel->attr;
572 int track = !evsel->idx; /* only the first counter needs these */
573
594ac61a 574 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
0f82ebc4 575 attr->inherit = !opts->no_inherit;
0f82ebc4 576
7be5ebe8
ACM		 577 perf_evsel__set_sample_bit(evsel, IP);
578 perf_evsel__set_sample_bit(evsel, TID);
0f82ebc4 579
3c176311
JO		 580 if (evsel->sample_read) {
581 perf_evsel__set_sample_bit(evsel, READ);
582
583 /*
584 * We need ID even in case of single event, because
585 * PERF_SAMPLE_READ process ID specific data.
586 */
75562573 587 perf_evsel__set_sample_id(evsel, false);
3c176311
JO		 588
589 /*
590 * Apply group format only if we belong to group
591 * with more than one members.
592 */
593 if (leader->nr_members > 1) {
594 attr->read_format |= PERF_FORMAT_GROUP;
595 attr->inherit = 0;
596 }
597 }
598
0f82ebc4
ACM		 599 /*
600 * We default some events to a 1 default interval. But keep
601 * it a weak assumption overridable by the user.
602 */
603 if (!attr->sample_period || (opts->user_freq != UINT_MAX &&
604 opts->user_interval != ULLONG_MAX)) {
605 if (opts->freq) {
7be5ebe8 606 perf_evsel__set_sample_bit(evsel, PERIOD);
0f82ebc4
ACM		 607 attr->freq = 1;
608 attr->sample_freq = opts->freq;
609 } else {
610 attr->sample_period = opts->default_interval;
611 }
612 }
613
3c176311
JO		 614 /*
615 * Disable sampling for all group members other
616 * than leader in case leader 'leads' the sampling.
617 */
618 if ((leader != evsel) && leader->sample_read) {
619 attr->sample_freq = 0;
620 attr->sample_period = 0;
621 }
622
0f82ebc4
ACM		 623 if (opts->no_samples)
624 attr->sample_freq = 0;
625
626 if (opts->inherit_stat)
627 attr->inherit_stat = 1;
628
629 if (opts->sample_address) {
7be5ebe8 630 perf_evsel__set_sample_bit(evsel, ADDR);
0f82ebc4
ACM		 631 attr->mmap_data = track;
632 }
633
26d33022 634 if (opts->call_graph) {
7be5ebe8 635 perf_evsel__set_sample_bit(evsel, CALLCHAIN);
0f82ebc4 636
26d33022 637 if (opts->call_graph == CALLCHAIN_DWARF) {
7be5ebe8
ACM		 638 perf_evsel__set_sample_bit(evsel, REGS_USER);
639 perf_evsel__set_sample_bit(evsel, STACK_USER);
26d33022
JO		 640 attr->sample_regs_user = PERF_REGS_MASK;
641 attr->sample_stack_user = opts->stack_dump_size;
642 attr->exclude_callchain_user = 1;
643 }
644 }
645
e40ee742 646 if (perf_target__has_cpu(&opts->target))
7be5ebe8 647 perf_evsel__set_sample_bit(evsel, CPU);
0f82ebc4 648
3e76ac78 649 if (opts->period)
7be5ebe8 650 perf_evsel__set_sample_bit(evsel, PERIOD);
3e76ac78 651
594ac61a 652 if (!perf_missing_features.sample_id_all &&
d67356e7 653 (opts->sample_time || !opts->no_inherit ||
aa22dd49 654 perf_target__has_cpu(&opts->target)))
7be5ebe8 655 perf_evsel__set_sample_bit(evsel, TIME);
0f82ebc4
ACM		 656
657 if (opts->raw_samples) {
7be5ebe8
ACM		 658 perf_evsel__set_sample_bit(evsel, TIME);
659 perf_evsel__set_sample_bit(evsel, RAW);
660 perf_evsel__set_sample_bit(evsel, CPU);
0f82ebc4
ACM		 661 }
662
ccf49bfc
SE		 663 if (opts->sample_address)
664 attr->sample_type |= PERF_SAMPLE_DATA_SRC;
665
0f82ebc4
ACM		 666 if (opts->no_delay) {
667 attr->watermark = 0;
668 attr->wakeup_events = 1;
669 }
bdfebd84 670 if (opts->branch_stack) {
7be5ebe8 671 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
bdfebd84
RAV		 672 attr->branch_sample_type = opts->branch_stack;
673 }
0f82ebc4 674
05484298
AK		 675 if (opts->sample_weight)
676 attr->sample_type |= PERF_SAMPLE_WEIGHT;
677
0f82ebc4
ACM		 678 attr->mmap = track;
679 attr->comm = track;
680
774cb499
JO		 681 /*
682 * XXX see the function comment above
683 *
684 * Disabling only independent events or group leaders,
685 * keeping group members enabled.
686 */
823254ed 687 if (perf_evsel__is_group_leader(evsel))
774cb499
JO		 688 attr->disabled = 1;
689
690 /*
691 * Setting enable_on_exec for independent events and
692 * group leaders for traced executed by perf.
693 */
823254ed 694 if (perf_target__none(&opts->target) && perf_evsel__is_group_leader(evsel))
0f82ebc4 695 attr->enable_on_exec = 1;
0f82ebc4
ACM		 696}
697
69aad6f1
ACM		 698int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
699{
4af4c955 700 int cpu, thread;
69aad6f1 701 evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
4af4c955
DA		 702
703 if (evsel->fd) {
704 for (cpu = 0; cpu < ncpus; cpu++) {
705 for (thread = 0; thread < nthreads; thread++) {
706 FD(evsel, cpu, thread) = -1;
707 }
708 }
709 }
710
69aad6f1
ACM		 711 return evsel->fd != NULL ? 0 : -ENOMEM;
712}
713
e2407bef
AK		 714static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads,
715 int ioc, void *arg)
745cefc5
ACM		 716{
717 int cpu, thread;
718
719 for (cpu = 0; cpu < ncpus; cpu++) {
720 for (thread = 0; thread < nthreads; thread++) {
721 int fd = FD(evsel, cpu, thread),
e2407bef 722 err = ioctl(fd, ioc, arg);
745cefc5
ACM		 723
724 if (err)
725 return err;
726 }
727 }
728
729 return 0;
730}
731
e2407bef
AK		 732int perf_evsel__set_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
733 const char *filter)
734{
735 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
736 PERF_EVENT_IOC_SET_FILTER,
737 (void *)filter);
738}
739
740int perf_evsel__enable(struct perf_evsel *evsel, int ncpus, int nthreads)
741{
742 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
743 PERF_EVENT_IOC_ENABLE,
744 0);
745}
746
70db7533
ACM		 747int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
748{
a91e5431
ACM		 749 evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
750 if (evsel->sample_id == NULL)
751 return -ENOMEM;
752
753 evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
754 if (evsel->id == NULL) {
755 xyarray__delete(evsel->sample_id);
756 evsel->sample_id = NULL;
757 return -ENOMEM;
758 }
759
760 return 0;
70db7533
ACM		 761}
762
a7e191c3
FD		 763void perf_evsel__reset_counts(struct perf_evsel *evsel, int ncpus)
764{
765 memset(evsel->counts, 0, (sizeof(*evsel->counts) +
766 (ncpus * sizeof(struct perf_counts_values))));
767}
768
c52b12ed
ACM		 769int perf_evsel__alloc_counts(struct perf_evsel *evsel, int ncpus)
770{
771 evsel->counts = zalloc((sizeof(*evsel->counts) +
772 (ncpus * sizeof(struct perf_counts_values))));
773 return evsel->counts != NULL ? 0 : -ENOMEM;
774}
775
69aad6f1
ACM		 776void perf_evsel__free_fd(struct perf_evsel *evsel)
777{
778 xyarray__delete(evsel->fd);
779 evsel->fd = NULL;
780}
781
70db7533
ACM		 782void perf_evsel__free_id(struct perf_evsel *evsel)
783{
a91e5431
ACM		 784 xyarray__delete(evsel->sample_id);
785 evsel->sample_id = NULL;
786 free(evsel->id);
70db7533
ACM		 787 evsel->id = NULL;
788}
789
c52b12ed
ACM		 790void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
791{
792 int cpu, thread;
793
794 for (cpu = 0; cpu < ncpus; cpu++)
795 for (thread = 0; thread < nthreads; ++thread) {
796 close(FD(evsel, cpu, thread));
797 FD(evsel, cpu, thread) = -1;
798 }
799}
800
43f8e76e
NK		 801void perf_evsel__free_counts(struct perf_evsel *evsel)
802{
803 free(evsel->counts);
804}
805
ef1d1af2 806void perf_evsel__exit(struct perf_evsel *evsel)
69aad6f1
ACM		 807{
808 assert(list_empty(&evsel->node));
736b05a0
NK		 809 perf_evsel__free_fd(evsel);
810 perf_evsel__free_id(evsel);
ef1d1af2
ACM		 811}
812
813void perf_evsel__delete(struct perf_evsel *evsel)
814{
815 perf_evsel__exit(evsel);
023695d9 816 close_cgroup(evsel->cgrp);
6a4bb04c 817 free(evsel->group_name);
e48ffe2b 818 if (evsel->tp_format)
efd2b924 819 pevent_free_format(evsel->tp_format);
f0c55bcf 820 free(evsel->name);
69aad6f1
ACM		 821 free(evsel);
822}
c52b12ed 823
c7a79c47
SE		 824static inline void compute_deltas(struct perf_evsel *evsel,
825 int cpu,
826 struct perf_counts_values *count)
827{
828 struct perf_counts_values tmp;
829
830 if (!evsel->prev_raw_counts)
831 return;
832
833 if (cpu == -1) {
834 tmp = evsel->prev_raw_counts->aggr;
835 evsel->prev_raw_counts->aggr = *count;
836 } else {
837 tmp = evsel->prev_raw_counts->cpu[cpu];
838 evsel->prev_raw_counts->cpu[cpu] = *count;
839 }
840
841 count->val = count->val - tmp.val;
842 count->ena = count->ena - tmp.ena;
843 count->run = count->run - tmp.run;
844}
845
c52b12ed
ACM		 846int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
847 int cpu, int thread, bool scale)
848{
849 struct perf_counts_values count;
850 size_t nv = scale ? 3 : 1;
851
852 if (FD(evsel, cpu, thread) < 0)
853 return -EINVAL;
854
4eed11d5
ACM		 855 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1) < 0)
856 return -ENOMEM;
857
c52b12ed
ACM		 858 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
859 return -errno;
860
c7a79c47
SE		 861 compute_deltas(evsel, cpu, &count);
862
c52b12ed
ACM		 863 if (scale) {
864 if (count.run == 0)
865 count.val = 0;
866 else if (count.run < count.ena)
867 count.val = (u64)((double)count.val * count.ena / count.run + 0.5);
868 } else
869 count.ena = count.run = 0;
870
871 evsel->counts->cpu[cpu] = count;
872 return 0;
873}
874
875int __perf_evsel__read(struct perf_evsel *evsel,
876 int ncpus, int nthreads, bool scale)
877{
878 size_t nv = scale ? 3 : 1;
879 int cpu, thread;
880 struct perf_counts_values *aggr = &evsel->counts->aggr, count;
881
52bcd994 882 aggr->val = aggr->ena = aggr->run = 0;
c52b12ed
ACM		 883
884 for (cpu = 0; cpu < ncpus; cpu++) {
885 for (thread = 0; thread < nthreads; thread++) {
886 if (FD(evsel, cpu, thread) < 0)
887 continue;
888
889 if (readn(FD(evsel, cpu, thread),
890 &count, nv * sizeof(u64)) < 0)
891 return -errno;
892
893 aggr->val += count.val;
894 if (scale) {
895 aggr->ena += count.ena;
896 aggr->run += count.run;
897 }
898 }
899 }
900
c7a79c47
SE		 901 compute_deltas(evsel, -1, aggr);
902
c52b12ed
ACM		 903 evsel->counts->scaled = 0;
904 if (scale) {
905 if (aggr->run == 0) {
906 evsel->counts->scaled = -1;
907 aggr->val = 0;
908 return 0;
909 }
910
911 if (aggr->run < aggr->ena) {
912 evsel->counts->scaled = 1;
913 aggr->val = (u64)((double)aggr->val * aggr->ena / aggr->run + 0.5);
914 }
915 } else
916 aggr->ena = aggr->run = 0;
917
918 return 0;
919}
48290609 920
6a4bb04c
JO		 921static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
922{
923 struct perf_evsel *leader = evsel->leader;
924 int fd;
925
823254ed 926 if (perf_evsel__is_group_leader(evsel))
6a4bb04c
JO		 927 return -1;
928
929 /*
930 * Leader must be already processed/open,
931 * if not it's a bug.
932 */
933 BUG_ON(!leader->fd);
934
935 fd = FD(leader, cpu, thread);
936 BUG_ON(fd == -1);
937
938 return fd;
939}
940
e3e1a54f
AH		 941#define __PRINT_ATTR(fmt, cast, field) \
942 fprintf(fp, " %-19s "fmt"\n", #field, cast attr->field)
943
944#define PRINT_ATTR_U32(field) __PRINT_ATTR("%u" , , field)
945#define PRINT_ATTR_X32(field) __PRINT_ATTR("%#x", , field)
946#define PRINT_ATTR_U64(field) __PRINT_ATTR("%" PRIu64, (uint64_t), field)
947#define PRINT_ATTR_X64(field) __PRINT_ATTR("%#"PRIx64, (uint64_t), field)
948
949#define PRINT_ATTR2N(name1, field1, name2, field2) \
950 fprintf(fp, " %-19s %u %-19s %u\n", \
951 name1, attr->field1, name2, attr->field2)
952
953#define PRINT_ATTR2(field1, field2) \
954 PRINT_ATTR2N(#field1, field1, #field2, field2)
955
956static size_t perf_event_attr__fprintf(struct perf_event_attr *attr, FILE *fp)
957{
958 size_t ret = 0;
959
960 ret += fprintf(fp, "%.60s\n", graph_dotted_line);
961 ret += fprintf(fp, "perf_event_attr:\n");
962
963 ret += PRINT_ATTR_U32(type);
964 ret += PRINT_ATTR_U32(size);
965 ret += PRINT_ATTR_X64(config);
966 ret += PRINT_ATTR_U64(sample_period);
967 ret += PRINT_ATTR_U64(sample_freq);
968 ret += PRINT_ATTR_X64(sample_type);
969 ret += PRINT_ATTR_X64(read_format);
970
971 ret += PRINT_ATTR2(disabled, inherit);
972 ret += PRINT_ATTR2(pinned, exclusive);
973 ret += PRINT_ATTR2(exclude_user, exclude_kernel);
974 ret += PRINT_ATTR2(exclude_hv, exclude_idle);
975 ret += PRINT_ATTR2(mmap, comm);
976 ret += PRINT_ATTR2(freq, inherit_stat);
977 ret += PRINT_ATTR2(enable_on_exec, task);
978 ret += PRINT_ATTR2(watermark, precise_ip);
979 ret += PRINT_ATTR2(mmap_data, sample_id_all);
980 ret += PRINT_ATTR2(exclude_host, exclude_guest);
981 ret += PRINT_ATTR2N("excl.callchain_kern", exclude_callchain_kernel,
982 "excl.callchain_user", exclude_callchain_user);
983
984 ret += PRINT_ATTR_U32(wakeup_events);
985 ret += PRINT_ATTR_U32(wakeup_watermark);
986 ret += PRINT_ATTR_X32(bp_type);
987 ret += PRINT_ATTR_X64(bp_addr);
988 ret += PRINT_ATTR_X64(config1);
989 ret += PRINT_ATTR_U64(bp_len);
990 ret += PRINT_ATTR_X64(config2);
991 ret += PRINT_ATTR_X64(branch_sample_type);
992 ret += PRINT_ATTR_X64(sample_regs_user);
993 ret += PRINT_ATTR_U32(sample_stack_user);
994
995 ret += fprintf(fp, "%.60s\n", graph_dotted_line);
996
997 return ret;
998}
999
0252208e 1000static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
6a4bb04c 1001 struct thread_map *threads)
48290609 1002{
0252208e 1003 int cpu, thread;
023695d9 1004 unsigned long flags = 0;
727ab04e 1005 int pid = -1, err;
bec19672 1006 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
48290609 1007
0252208e
ACM		 1008 if (evsel->fd == NULL &&
1009 perf_evsel__alloc_fd(evsel, cpus->nr, threads->nr) < 0)
727ab04e 1010 return -ENOMEM;
4eed11d5 1011
023695d9
SE		 1012 if (evsel->cgrp) {
1013 flags = PERF_FLAG_PID_CGROUP;
1014 pid = evsel->cgrp->fd;
1015 }
1016
594ac61a
ACM		 1017fallback_missing_features:
1018 if (perf_missing_features.exclude_guest)
1019 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
1020retry_sample_id:
1021 if (perf_missing_features.sample_id_all)
1022 evsel->attr.sample_id_all = 0;
1023
e3e1a54f
AH		 1024 if (verbose >= 2)
1025 perf_event_attr__fprintf(&evsel->attr, stderr);
1026
86bd5e86 1027 for (cpu = 0; cpu < cpus->nr; cpu++) {
9d04f178 1028
0252208e 1029 for (thread = 0; thread < threads->nr; thread++) {
6a4bb04c 1030 int group_fd;
023695d9
SE		 1031
1032 if (!evsel->cgrp)
1033 pid = threads->map[thread];
1034
6a4bb04c 1035 group_fd = get_group_fd(evsel, cpu, thread);
bec19672 1036retry_open:
e3e1a54f
AH		 1037 pr_debug2("perf_event_open: pid %d cpu %d group_fd %d flags %#lx\n",
1038 pid, cpus->map[cpu], group_fd, flags);
1039
0252208e 1040 FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
023695d9 1041 pid,
f08199d3 1042 cpus->map[cpu],
023695d9 1043 group_fd, flags);
727ab04e
ACM		 1044 if (FD(evsel, cpu, thread) < 0) {
1045 err = -errno;
594ac61a 1046 goto try_fallback;
727ab04e 1047 }
bec19672 1048 set_rlimit = NO_CHANGE;
0252208e 1049 }
48290609
ACM		 1050 }
1051
1052 return 0;
1053
594ac61a 1054try_fallback:
bec19672
AK		 1055 /*
1056 * perf stat needs between 5 and 22 fds per CPU. When we run out
1057 * of them try to increase the limits.
1058 */
1059 if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1060 struct rlimit l;
1061 int old_errno = errno;
1062
1063 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1064 if (set_rlimit == NO_CHANGE)
1065 l.rlim_cur = l.rlim_max;
1066 else {
1067 l.rlim_cur = l.rlim_max + 1000;
1068 l.rlim_max = l.rlim_cur;
1069 }
1070 if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1071 set_rlimit++;
1072 errno = old_errno;
1073 goto retry_open;
1074 }
1075 }
1076 errno = old_errno;
1077 }
1078
594ac61a
ACM		 1079 if (err != -EINVAL || cpu > 0 || thread > 0)
1080 goto out_close;
1081
1082 if (!perf_missing_features.exclude_guest &&
1083 (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
1084 perf_missing_features.exclude_guest = true;
1085 goto fallback_missing_features;
1086 } else if (!perf_missing_features.sample_id_all) {
1087 perf_missing_features.sample_id_all = true;
1088 goto retry_sample_id;
1089 }
1090
48290609 1091out_close:
0252208e
ACM		 1092 do {
1093 while (--thread >= 0) {
1094 close(FD(evsel, cpu, thread));
1095 FD(evsel, cpu, thread) = -1;
1096 }
1097 thread = threads->nr;
1098 } while (--cpu >= 0);
727ab04e
ACM		 1099 return err;
1100}
1101
1102void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads)
1103{
1104 if (evsel->fd == NULL)
1105 return;
1106
1107 perf_evsel__close_fd(evsel, ncpus, nthreads);
1108 perf_evsel__free_fd(evsel);
1109 evsel->fd = NULL;
48290609
ACM		 1110}
1111
0252208e
ACM		 1112static struct {
1113 struct cpu_map map;
1114 int cpus[1];
1115} empty_cpu_map = {
1116 .map.nr = 1,
1117 .cpus = { -1, },
1118};
1119
1120static struct {
1121 struct thread_map map;
1122 int threads[1];
1123} empty_thread_map = {
1124 .map.nr = 1,
1125 .threads = { -1, },
1126};
1127
f08199d3 1128int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
6a4bb04c 1129 struct thread_map *threads)
48290609 1130{
0252208e
ACM		 1131 if (cpus == NULL) {
1132 /* Work around old compiler warnings about strict aliasing */
1133 cpus = &empty_cpu_map.map;
48290609
ACM		 1134 }
1135
0252208e
ACM		 1136 if (threads == NULL)
1137 threads = &empty_thread_map.map;
48290609 1138
6a4bb04c 1139 return __perf_evsel__open(evsel, cpus, threads);
48290609
ACM		 1140}
1141
f08199d3 1142int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
6a4bb04c 1143 struct cpu_map *cpus)
48290609 1144{
6a4bb04c 1145 return __perf_evsel__open(evsel, cpus, &empty_thread_map.map);
0252208e 1146}
48290609 1147
f08199d3 1148int perf_evsel__open_per_thread(struct perf_evsel *evsel,
6a4bb04c 1149 struct thread_map *threads)
0252208e 1150{
6a4bb04c 1151 return __perf_evsel__open(evsel, &empty_cpu_map.map, threads);
48290609 1152}
70082dd9 1153
0807d2d8
ACM		 1154static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
1155 const union perf_event *event,
1156 struct perf_sample *sample)
d0dd74e8 1157{
0807d2d8 1158 u64 type = evsel->attr.sample_type;
d0dd74e8 1159 const u64 *array = event->sample.array;
0807d2d8 1160 bool swapped = evsel->needs_swap;
37073f9e 1161 union u64_swap u;
d0dd74e8
ACM		 1162
1163 array += ((event->header.size -
1164 sizeof(event->header)) / sizeof(u64)) - 1;
1165
75562573
AH		 1166 if (type & PERF_SAMPLE_IDENTIFIER) {
1167 sample->id = *array;
1168 array--;
1169 }
1170
d0dd74e8 1171 if (type & PERF_SAMPLE_CPU) {
37073f9e
JO		 1172 u.val64 = *array;
1173 if (swapped) {
1174 /* undo swap of u64, then swap on individual u32s */
1175 u.val64 = bswap_64(u.val64);
1176 u.val32[0] = bswap_32(u.val32[0]);
1177 }
1178
1179 sample->cpu = u.val32[0];
d0dd74e8
ACM		 1180 array--;
1181 }
1182
1183 if (type & PERF_SAMPLE_STREAM_ID) {
1184 sample->stream_id = *array;
1185 array--;
1186 }
1187
1188 if (type & PERF_SAMPLE_ID) {
1189 sample->id = *array;
1190 array--;
1191 }
1192
1193 if (type & PERF_SAMPLE_TIME) {
1194 sample->time = *array;
1195 array--;
1196 }
1197
1198 if (type & PERF_SAMPLE_TID) {
37073f9e
JO		 1199 u.val64 = *array;
1200 if (swapped) {
1201 /* undo swap of u64, then swap on individual u32s */
1202 u.val64 = bswap_64(u.val64);
1203 u.val32[0] = bswap_32(u.val32[0]);
1204 u.val32[1] = bswap_32(u.val32[1]);
1205 }
1206
1207 sample->pid = u.val32[0];
1208 sample->tid = u.val32[1];
d0dd74e8
ACM		 1209 }
1210
1211 return 0;
1212}
1213
03b6ea9b
AH		 1214static inline bool overflow(const void *endp, u16 max_size, const void *offset,
1215 u64 size)
98e1da90 1216{
03b6ea9b
AH		 1217 return size > max_size || offset + size > endp;
1218}
98e1da90 1219
03b6ea9b
AH		 1220#define OVERFLOW_CHECK(offset, size, max_size) \
1221 do { \
1222 if (overflow(endp, (max_size), (offset), (size))) \
1223 return -EFAULT; \
1224 } while (0)
98e1da90 1225
03b6ea9b
AH		 1226#define OVERFLOW_CHECK_u64(offset) \
1227 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
98e1da90 1228
a3f698fe 1229int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
0807d2d8 1230 struct perf_sample *data)
d0dd74e8 1231{
a3f698fe 1232 u64 type = evsel->attr.sample_type;
0807d2d8 1233 bool swapped = evsel->needs_swap;
d0dd74e8 1234 const u64 *array;
03b6ea9b
AH		 1235 u16 max_size = event->header.size;
1236 const void *endp = (void *)event + max_size;
1237 u64 sz;
d0dd74e8 1238
936be503
DA		 1239 /*
1240 * used for cross-endian analysis. See git commit 65014ab3
1241 * for why this goofiness is needed.
1242 */
6a11f92e 1243 union u64_swap u;
936be503 1244
f3bda2c9 1245 memset(data, 0, sizeof(*data));
d0dd74e8
ACM		 1246 data->cpu = data->pid = data->tid = -1;
1247 data->stream_id = data->id = data->time = -1ULL;
a4a03fc7 1248 data->period = 1;
05484298 1249 data->weight = 0;
d0dd74e8
ACM		 1250
1251 if (event->header.type != PERF_RECORD_SAMPLE) {
a3f698fe 1252 if (!evsel->attr.sample_id_all)
d0dd74e8 1253 return 0;
0807d2d8 1254 return perf_evsel__parse_id_sample(evsel, event, data);
d0dd74e8
ACM		 1255 }
1256
1257 array = event->sample.array;
1258
03b6ea9b
AH		 1259 /*
1260 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
1261 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
1262 * check the format does not go past the end of the event.
1263 */
a3f698fe 1264 if (evsel->sample_size + sizeof(event->header) > event->header.size)
a2854124
FW		 1265 return -EFAULT;
1266
75562573
AH		 1267 data->id = -1ULL;
1268 if (type & PERF_SAMPLE_IDENTIFIER) {
1269 data->id = *array;
1270 array++;
1271 }
1272
d0dd74e8 1273 if (type & PERF_SAMPLE_IP) {
ef89325f 1274 data->ip = *array;
d0dd74e8
ACM		 1275 array++;
1276 }
1277
1278 if (type & PERF_SAMPLE_TID) {
936be503
DA		 1279 u.val64 = *array;
1280 if (swapped) {
1281 /* undo swap of u64, then swap on individual u32s */
1282 u.val64 = bswap_64(u.val64);
1283 u.val32[0] = bswap_32(u.val32[0]);
1284 u.val32[1] = bswap_32(u.val32[1]);
1285 }
1286
1287 data->pid = u.val32[0];
1288 data->tid = u.val32[1];
d0dd74e8
ACM		 1289 array++;
1290 }
1291
1292 if (type & PERF_SAMPLE_TIME) {
1293 data->time = *array;
1294 array++;
1295 }
1296
7cec0922 1297 data->addr = 0;
d0dd74e8
ACM		 1298 if (type & PERF_SAMPLE_ADDR) {
1299 data->addr = *array;
1300 array++;
1301 }
1302
d0dd74e8
ACM		 1303 if (type & PERF_SAMPLE_ID) {
1304 data->id = *array;
1305 array++;
1306 }
1307
1308 if (type & PERF_SAMPLE_STREAM_ID) {
1309 data->stream_id = *array;
1310 array++;
1311 }
1312
1313 if (type & PERF_SAMPLE_CPU) {
936be503
DA		 1314
1315 u.val64 = *array;
1316 if (swapped) {
1317 /* undo swap of u64, then swap on individual u32s */
1318 u.val64 = bswap_64(u.val64);
1319 u.val32[0] = bswap_32(u.val32[0]);
1320 }
1321
1322 data->cpu = u.val32[0];
d0dd74e8
ACM		 1323 array++;
1324 }
1325
1326 if (type & PERF_SAMPLE_PERIOD) {
1327 data->period = *array;
1328 array++;
1329 }
1330
1331 if (type & PERF_SAMPLE_READ) {
9ede473c
JO		 1332 u64 read_format = evsel->attr.read_format;
1333
03b6ea9b 1334 OVERFLOW_CHECK_u64(array);
9ede473c
JO		 1335 if (read_format & PERF_FORMAT_GROUP)
1336 data->read.group.nr = *array;
1337 else
1338 data->read.one.value = *array;
1339
1340 array++;
1341
1342 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
03b6ea9b 1343 OVERFLOW_CHECK_u64(array);
9ede473c
JO		 1344 data->read.time_enabled = *array;
1345 array++;
1346 }
1347
1348 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
03b6ea9b 1349 OVERFLOW_CHECK_u64(array);
9ede473c
JO		 1350 data->read.time_running = *array;
1351 array++;
1352 }
1353
1354 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1355 if (read_format & PERF_FORMAT_GROUP) {
03b6ea9b
AH		 1356 const u64 max_group_nr = UINT64_MAX /
1357 sizeof(struct sample_read_value);
1358
1359 if (data->read.group.nr > max_group_nr)
1360 return -EFAULT;
1361 sz = data->read.group.nr *
1362 sizeof(struct sample_read_value);
1363 OVERFLOW_CHECK(array, sz, max_size);
1364 data->read.group.values =
1365 (struct sample_read_value *)array;
1366 array = (void *)array + sz;
9ede473c 1367 } else {
03b6ea9b 1368 OVERFLOW_CHECK_u64(array);
9ede473c
JO		 1369 data->read.one.id = *array;
1370 array++;
1371 }
d0dd74e8
ACM		 1372 }
1373
1374 if (type & PERF_SAMPLE_CALLCHAIN) {
03b6ea9b 1375 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
98e1da90 1376
03b6ea9b
AH		 1377 OVERFLOW_CHECK_u64(array);
1378 data->callchain = (struct ip_callchain *)array++;
1379 if (data->callchain->nr > max_callchain_nr)
98e1da90 1380 return -EFAULT;
03b6ea9b
AH		 1381 sz = data->callchain->nr * sizeof(u64);
1382 OVERFLOW_CHECK(array, sz, max_size);
1383 array = (void *)array + sz;
d0dd74e8
ACM		 1384 }
1385
1386 if (type & PERF_SAMPLE_RAW) {
03b6ea9b 1387 OVERFLOW_CHECK_u64(array);
936be503
DA		 1388 u.val64 = *array;
1389 if (WARN_ONCE(swapped,
1390 "Endianness of raw data not corrected!\n")) {
1391 /* undo swap of u64, then swap on individual u32s */
1392 u.val64 = bswap_64(u.val64);
1393 u.val32[0] = bswap_32(u.val32[0]);
1394 u.val32[1] = bswap_32(u.val32[1]);
1395 }
936be503 1396 data->raw_size = u.val32[0];
03b6ea9b 1397 array = (void *)array + sizeof(u32);
98e1da90 1398
03b6ea9b
AH		 1399 OVERFLOW_CHECK(array, data->raw_size, max_size);
1400 data->raw_data = (void *)array;
1401 array = (void *)array + data->raw_size;
d0dd74e8
ACM		 1402 }
1403
b5387528 1404 if (type & PERF_SAMPLE_BRANCH_STACK) {
03b6ea9b
AH		 1405 const u64 max_branch_nr = UINT64_MAX /
1406 sizeof(struct branch_entry);
b5387528 1407
03b6ea9b
AH		 1408 OVERFLOW_CHECK_u64(array);
1409 data->branch_stack = (struct branch_stack *)array++;
b5387528 1410
03b6ea9b
AH		 1411 if (data->branch_stack->nr > max_branch_nr)
1412 return -EFAULT;
b5387528 1413 sz = data->branch_stack->nr * sizeof(struct branch_entry);
03b6ea9b
AH		 1414 OVERFLOW_CHECK(array, sz, max_size);
1415 array = (void *)array + sz;
b5387528 1416 }
0f6a3015
JO		 1417
1418 if (type & PERF_SAMPLE_REGS_USER) {
03b6ea9b 1419 OVERFLOW_CHECK_u64(array);
5b95a4a3
AH		 1420 data->user_regs.abi = *array;
1421 array++;
0f6a3015 1422
5b95a4a3 1423 if (data->user_regs.abi) {
03b6ea9b
AH		 1424 u64 regs_user = evsel->attr.sample_regs_user;
1425
1426 sz = hweight_long(regs_user) * sizeof(u64);
1427 OVERFLOW_CHECK(array, sz, max_size);
0f6a3015 1428 data->user_regs.regs = (u64 *)array;
03b6ea9b 1429 array = (void *)array + sz;
0f6a3015
JO		 1430 }
1431 }
1432
1433 if (type & PERF_SAMPLE_STACK_USER) {
03b6ea9b
AH		 1434 OVERFLOW_CHECK_u64(array);
1435 sz = *array++;
0f6a3015
JO		 1436
1437 data->user_stack.offset = ((char *)(array - 1)
1438 - (char *) event);
1439
03b6ea9b 1440 if (!sz) {
0f6a3015
JO		 1441 data->user_stack.size = 0;
1442 } else {
03b6ea9b 1443 OVERFLOW_CHECK(array, sz, max_size);
0f6a3015 1444 data->user_stack.data = (char *)array;
03b6ea9b
AH		 1445 array = (void *)array + sz;
1446 OVERFLOW_CHECK_u64(array);
54bd2692 1447 data->user_stack.size = *array++;
0f6a3015
JO		 1448 }
1449 }
1450
05484298
AK		 1451 data->weight = 0;
1452 if (type & PERF_SAMPLE_WEIGHT) {
03b6ea9b 1453 OVERFLOW_CHECK_u64(array);
05484298
AK		 1454 data->weight = *array;
1455 array++;
1456 }
1457
98a3b32c
SE		 1458 data->data_src = PERF_MEM_DATA_SRC_NONE;
1459 if (type & PERF_SAMPLE_DATA_SRC) {
03b6ea9b 1460 OVERFLOW_CHECK_u64(array);
98a3b32c
SE		 1461 data->data_src = *array;
1462 array++;
1463 }
1464
d0dd74e8
ACM		 1465 return 0;
1466}
74eec26f
AV		 1467
1468int perf_event__synthesize_sample(union perf_event *event, u64 type,
d03f2170 1469 u64 sample_regs_user, u64 read_format,
74eec26f
AV		 1470 const struct perf_sample *sample,
1471 bool swapped)
1472{
1473 u64 *array;
d03f2170 1474 size_t sz;
74eec26f
AV		 1475 /*
1476 * used for cross-endian analysis. See git commit 65014ab3
1477 * for why this goofiness is needed.
1478 */
6a11f92e 1479 union u64_swap u;
74eec26f
AV		 1480
1481 array = event->sample.array;
1482
75562573
AH		 1483 if (type & PERF_SAMPLE_IDENTIFIER) {
1484 *array = sample->id;
1485 array++;
1486 }
1487
74eec26f 1488 if (type & PERF_SAMPLE_IP) {
ef89325f 1489 *array = sample->ip;
74eec26f
AV		 1490 array++;
1491 }
1492
1493 if (type & PERF_SAMPLE_TID) {
1494 u.val32[0] = sample->pid;
1495 u.val32[1] = sample->tid;
1496 if (swapped) {
1497 /*
a3f698fe 1498 * Inverse of what is done in perf_evsel__parse_sample
74eec26f
AV		 1499 */
1500 u.val32[0] = bswap_32(u.val32[0]);
1501 u.val32[1] = bswap_32(u.val32[1]);
1502 u.val64 = bswap_64(u.val64);
1503 }
1504
1505 *array = u.val64;
1506 array++;
1507 }
1508
1509 if (type & PERF_SAMPLE_TIME) {
1510 *array = sample->time;
1511 array++;
1512 }
1513
1514 if (type & PERF_SAMPLE_ADDR) {
1515 *array = sample->addr;
1516 array++;
1517 }
1518
1519 if (type & PERF_SAMPLE_ID) {
1520 *array = sample->id;
1521 array++;
1522 }
1523
1524 if (type & PERF_SAMPLE_STREAM_ID) {
1525 *array = sample->stream_id;
1526 array++;
1527 }
1528
1529 if (type & PERF_SAMPLE_CPU) {
1530 u.val32[0] = sample->cpu;
1531 if (swapped) {
1532 /*
a3f698fe 1533 * Inverse of what is done in perf_evsel__parse_sample
74eec26f
AV		 1534 */
1535 u.val32[0] = bswap_32(u.val32[0]);
1536 u.val64 = bswap_64(u.val64);
1537 }
1538 *array = u.val64;
1539 array++;
1540 }
1541
1542 if (type & PERF_SAMPLE_PERIOD) {
1543 *array = sample->period;
1544 array++;
1545 }
1546
d03f2170
AH		 1547 if (type & PERF_SAMPLE_READ) {
1548 if (read_format & PERF_FORMAT_GROUP)
1549 *array = sample->read.group.nr;
1550 else
1551 *array = sample->read.one.value;
1552 array++;
1553
1554 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
1555 *array = sample->read.time_enabled;
1556 array++;
1557 }
1558
1559 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
1560 *array = sample->read.time_running;
1561 array++;
1562 }
1563
1564 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1565 if (read_format & PERF_FORMAT_GROUP) {
1566 sz = sample->read.group.nr *
1567 sizeof(struct sample_read_value);
1568 memcpy(array, sample->read.group.values, sz);
1569 array = (void *)array + sz;
1570 } else {
1571 *array = sample->read.one.id;
1572 array++;
1573 }
1574 }
1575
1576 if (type & PERF_SAMPLE_CALLCHAIN) {
1577 sz = (sample->callchain->nr + 1) * sizeof(u64);
1578 memcpy(array, sample->callchain, sz);
1579 array = (void *)array + sz;
1580 }
1581
1582 if (type & PERF_SAMPLE_RAW) {
1583 u.val32[0] = sample->raw_size;
1584 if (WARN_ONCE(swapped,
1585 "Endianness of raw data not corrected!\n")) {
1586 /*
1587 * Inverse of what is done in perf_evsel__parse_sample
1588 */
1589 u.val32[0] = bswap_32(u.val32[0]);
1590 u.val32[1] = bswap_32(u.val32[1]);
1591 u.val64 = bswap_64(u.val64);
1592 }
1593 *array = u.val64;
1594 array = (void *)array + sizeof(u32);
1595
1596 memcpy(array, sample->raw_data, sample->raw_size);
1597 array = (void *)array + sample->raw_size;
1598 }
1599
1600 if (type & PERF_SAMPLE_BRANCH_STACK) {
1601 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1602 sz += sizeof(u64);
1603 memcpy(array, sample->branch_stack, sz);
1604 array = (void *)array + sz;
1605 }
1606
1607 if (type & PERF_SAMPLE_REGS_USER) {
1608 if (sample->user_regs.abi) {
1609 *array++ = sample->user_regs.abi;
1610 sz = hweight_long(sample_regs_user) * sizeof(u64);
1611 memcpy(array, sample->user_regs.regs, sz);
1612 array = (void *)array + sz;
1613 } else {
1614 *array++ = 0;
1615 }
1616 }
1617
1618 if (type & PERF_SAMPLE_STACK_USER) {
1619 sz = sample->user_stack.size;
1620 *array++ = sz;
1621 if (sz) {
1622 memcpy(array, sample->user_stack.data, sz);
1623 array = (void *)array + sz;
1624 *array++ = sz;
1625 }
1626 }
1627
1628 if (type & PERF_SAMPLE_WEIGHT) {
1629 *array = sample->weight;
1630 array++;
1631 }
1632
1633 if (type & PERF_SAMPLE_DATA_SRC) {
1634 *array = sample->data_src;
1635 array++;
1636 }
1637
74eec26f
AV		 1638 return 0;
1639}
5555ded4 1640
efd2b924
ACM		 1641struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
1642{
1643 return pevent_find_field(evsel->tp_format, name);
1644}
1645
5d2074ea 1646void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
5555ded4
ACM		 1647 const char *name)
1648{
efd2b924 1649 struct format_field *field = perf_evsel__field(evsel, name);
5555ded4
ACM		 1650 int offset;
1651
efd2b924
ACM		 1652 if (!field)
1653 return NULL;
5555ded4
ACM		 1654
1655 offset = field->offset;
1656
1657 if (field->flags & FIELD_IS_DYNAMIC) {
1658 offset = *(int *)(sample->raw_data + field->offset);
1659 offset &= 0xffff;
1660 }
1661
1662 return sample->raw_data + offset;
1663}
1664
1665u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
1666 const char *name)
1667{
efd2b924 1668 struct format_field *field = perf_evsel__field(evsel, name);
e6b6f679
ACM		 1669 void *ptr;
1670 u64 value;
5555ded4 1671
efd2b924
ACM		 1672 if (!field)
1673 return 0;
5555ded4 1674
e6b6f679 1675 ptr = sample->raw_data + field->offset;
5555ded4 1676
e6b6f679
ACM		 1677 switch (field->size) {
1678 case 1:
1679 return *(u8 *)ptr;
1680 case 2:
1681 value = *(u16 *)ptr;
1682 break;
1683 case 4:
1684 value = *(u32 *)ptr;
1685 break;
1686 case 8:
1687 value = *(u64 *)ptr;
1688 break;
1689 default:
1690 return 0;
1691 }
1692
1693 if (!evsel->needs_swap)
1694 return value;
1695
1696 switch (field->size) {
1697 case 2:
1698 return bswap_16(value);
1699 case 4:
1700 return bswap_32(value);
1701 case 8:
1702 return bswap_64(value);
1703 default:
1704 return 0;
1705 }
1706
1707 return 0;
5555ded4 1708}
0698aedd
ACM		 1709
1710static int comma_fprintf(FILE *fp, bool *first, const char *fmt, ...)
1711{
1712 va_list args;
1713 int ret = 0;
1714
1715 if (!*first) {
1716 ret += fprintf(fp, ",");
1717 } else {
1718 ret += fprintf(fp, ":");
1719 *first = false;
1720 }
1721
1722 va_start(args, fmt);
1723 ret += vfprintf(fp, fmt, args);
1724 va_end(args);
1725 return ret;
1726}
1727
1728static int __if_fprintf(FILE *fp, bool *first, const char *field, u64 value)
1729{
1730 if (value == 0)
1731 return 0;
1732
1733 return comma_fprintf(fp, first, " %s: %" PRIu64, field, value);
1734}
1735
1736#define if_print(field) printed += __if_fprintf(fp, &first, #field, evsel->attr.field)
1737
c79a4393
ACM		 1738struct bit_names {
1739 int bit;
1740 const char *name;
1741};
1742
1743static int bits__fprintf(FILE *fp, const char *field, u64 value,
1744 struct bit_names *bits, bool *first)
1745{
1746 int i = 0, printed = comma_fprintf(fp, first, " %s: ", field);
1747 bool first_bit = true;
1748
1749 do {
1750 if (value & bits[i].bit) {
1751 printed += fprintf(fp, "%s%s", first_bit ? "" : "|", bits[i].name);
1752 first_bit = false;
1753 }
1754 } while (bits[++i].name != NULL);
1755
1756 return printed;
1757}
1758
1759static int sample_type__fprintf(FILE *fp, bool *first, u64 value)
1760{
1761#define bit_name(n) { PERF_SAMPLE_##n, #n }
1762 struct bit_names bits[] = {
1763 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
1764 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
1765 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
1766 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
75562573 1767 bit_name(IDENTIFIER),
c79a4393
ACM		 1768 { .name = NULL, }
1769 };
1770#undef bit_name
1771 return bits__fprintf(fp, "sample_type", value, bits, first);
1772}
1773
1774static int read_format__fprintf(FILE *fp, bool *first, u64 value)
1775{
1776#define bit_name(n) { PERF_FORMAT_##n, #n }
1777 struct bit_names bits[] = {
1778 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
1779 bit_name(ID), bit_name(GROUP),
1780 { .name = NULL, }
1781 };
1782#undef bit_name
1783 return bits__fprintf(fp, "read_format", value, bits, first);
1784}
1785
0698aedd
ACM		 1786int perf_evsel__fprintf(struct perf_evsel *evsel,
1787 struct perf_attr_details *details, FILE *fp)
1788{
1789 bool first = true;
e6ab07d0
NK		 1790 int printed = 0;
1791
e35ef355 1792 if (details->event_group) {
e6ab07d0
NK		 1793 struct perf_evsel *pos;
1794
1795 if (!perf_evsel__is_group_leader(evsel))
1796 return 0;
1797
1798 if (evsel->nr_members > 1)
1799 printed += fprintf(fp, "%s{", evsel->group_name ?: "");
1800
1801 printed += fprintf(fp, "%s", perf_evsel__name(evsel));
1802 for_each_group_member(pos, evsel)
1803 printed += fprintf(fp, ",%s", perf_evsel__name(pos));
1804
1805 if (evsel->nr_members > 1)
1806 printed += fprintf(fp, "}");
1807 goto out;
1808 }
1809
1810 printed += fprintf(fp, "%s", perf_evsel__name(evsel));
0698aedd
ACM		 1811
1812 if (details->verbose || details->freq) {
1813 printed += comma_fprintf(fp, &first, " sample_freq=%" PRIu64,
1814 (u64)evsel->attr.sample_freq);
1815 }
1816
1817 if (details->verbose) {
1818 if_print(type);
1819 if_print(config);
1820 if_print(config1);
1821 if_print(config2);
1822 if_print(size);
c79a4393
ACM		 1823 printed += sample_type__fprintf(fp, &first, evsel->attr.sample_type);
1824 if (evsel->attr.read_format)
1825 printed += read_format__fprintf(fp, &first, evsel->attr.read_format);
0698aedd
ACM		 1826 if_print(disabled);
1827 if_print(inherit);
1828 if_print(pinned);
1829 if_print(exclusive);
1830 if_print(exclude_user);
1831 if_print(exclude_kernel);
1832 if_print(exclude_hv);
1833 if_print(exclude_idle);
1834 if_print(mmap);
1835 if_print(comm);
1836 if_print(freq);
1837 if_print(inherit_stat);
1838 if_print(enable_on_exec);
1839 if_print(task);
1840 if_print(watermark);
1841 if_print(precise_ip);
1842 if_print(mmap_data);
1843 if_print(sample_id_all);
1844 if_print(exclude_host);
1845 if_print(exclude_guest);
1846 if_print(__reserved_1);
1847 if_print(wakeup_events);
1848 if_print(bp_type);
1849 if_print(branch_sample_type);
1850 }
e6ab07d0 1851out:
0698aedd
ACM		 1852 fputc('\n', fp);
1853 return ++printed;
1854}
c0a54341
ACM		 1855
1856bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
1857 char *msg, size_t msgsize)
1858{
2b821cce 1859 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
c0a54341
ACM		 1860 evsel->attr.type == PERF_TYPE_HARDWARE &&
1861 evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
1862 /*
1863 * If it's cycles then fall back to hrtimer based
1864 * cpu-clock-tick sw counter, which is always available even if
1865 * no PMU support.
1866 *
1867 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
1868 * b0a873e).
1869 */
1870 scnprintf(msg, msgsize, "%s",
1871"The cycles event is not supported, trying to fall back to cpu-clock-ticks");
1872
1873 evsel->attr.type = PERF_TYPE_SOFTWARE;
1874 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
1875
1876 free(evsel->name);
1877 evsel->name = NULL;
1878 return true;
1879 }
1880
1881 return false;
1882}
56e52e85
ACM		 1883
1884int perf_evsel__open_strerror(struct perf_evsel *evsel,
1885 struct perf_target *target,
1886 int err, char *msg, size_t size)
1887{
1888 switch (err) {
1889 case EPERM:
1890 case EACCES:
b69e63a4 1891 return scnprintf(msg, size,
56e52e85
ACM		 1892 "You may not have permission to collect %sstats.\n"
1893 "Consider tweaking /proc/sys/kernel/perf_event_paranoid:\n"
1894 " -1 - Not paranoid at all\n"
1895 " 0 - Disallow raw tracepoint access for unpriv\n"
1896 " 1 - Disallow cpu events for unpriv\n"
1897 " 2 - Disallow kernel profiling for unpriv",
1898 target->system_wide ? "system-wide " : "");
1899 case ENOENT:
1900 return scnprintf(msg, size, "The %s event is not supported.",
1901 perf_evsel__name(evsel));
1902 case EMFILE:
1903 return scnprintf(msg, size, "%s",
1904 "Too many events are opened.\n"
1905 "Try again after reducing the number of events.");
1906 case ENODEV:
1907 if (target->cpu_list)
1908 return scnprintf(msg, size, "%s",
1909 "No such device - did you specify an out-of-range profile CPU?\n");
1910 break;
1911 case EOPNOTSUPP:
1912 if (evsel->attr.precise_ip)
1913 return scnprintf(msg, size, "%s",
1914 "\'precise\' request may not be supported. Try removing 'p' modifier.");
1915#if defined(__i386__) || defined(__x86_64__)
1916 if (evsel->attr.type == PERF_TYPE_HARDWARE)
1917 return scnprintf(msg, size, "%s",
1918 "No hardware sampling interrupt available.\n"
1919 "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.");
1920#endif
1921 break;
1922 default:
1923 break;
1924 }
1925
1926 return scnprintf(msg, size,
1927 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s). \n"
1928 "/bin/dmesg may provide additional information.\n"
1929 "No CONFIG_PERF_EVENTS=y kernel support configured?\n",
1930 err, strerror(err), perf_evsel__name(evsel));
1931}
Linux 6.x block layer and io_uring tree(s)