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ARM: dts: sun8i: Add dts file for the Orange Pi One SBC
[deliverable/linux.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>
4605eab3 12#include <api/fs/tracing_path.h>
4e319027
RR		 13#include <traceevent/event-parse.h>
14#include <linux/hw_breakpoint.h>
15#include <linux/perf_event.h>
8dd2a131 16#include <linux/err.h>
bec19672 17#include <sys/resource.h>
4e319027 18#include "asm/bug.h"
8f651eae 19#include "callchain.h"
f14d5707 20#include "cgroup.h"
69aad6f1 21#include "evsel.h"
70082dd9 22#include "evlist.h"
69aad6f1 23#include "util.h"
86bd5e86 24#include "cpumap.h"
fd78260b 25#include "thread_map.h"
12864b31 26#include "target.h"
26d33022 27#include "perf_regs.h"
e3e1a54f 28#include "debug.h"
97978b3e 29#include "trace-event.h"
a9a3a4d9 30#include "stat.h"
69aad6f1 31
594ac61a
ACM		 32static struct {
33 bool sample_id_all;
34 bool exclude_guest;
5c5e854b 35 bool mmap2;
57480d2c 36 bool cloexec;
814c8c38
PZ		 37 bool clockid;
38 bool clockid_wrong;
bd0f8895 39 bool lbr_flags;
594ac61a
ACM		 40} perf_missing_features;
41
814c8c38
PZ		 42static clockid_t clockid;
43
ce8ccff5
ACM		 44static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused)
45{
46 return 0;
47}
48
49static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused)
50{
51}
52
53static struct {
54 size_t size;
55 int (*init)(struct perf_evsel *evsel);
56 void (*fini)(struct perf_evsel *evsel);
57} perf_evsel__object = {
58 .size = sizeof(struct perf_evsel),
59 .init = perf_evsel__no_extra_init,
60 .fini = perf_evsel__no_extra_fini,
61};
62
63int perf_evsel__object_config(size_t object_size,
64 int (*init)(struct perf_evsel *evsel),
65 void (*fini)(struct perf_evsel *evsel))
66{
67
68 if (object_size == 0)
69 goto set_methods;
70
71 if (perf_evsel__object.size > object_size)
72 return -EINVAL;
73
74 perf_evsel__object.size = object_size;
75
76set_methods:
77 if (init != NULL)
78 perf_evsel__object.init = init;
79
80 if (fini != NULL)
81 perf_evsel__object.fini = fini;
82
83 return 0;
84}
85
c52b12ed
ACM		 86#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
87
75562573 88int __perf_evsel__sample_size(u64 sample_type)
c2a70653
ACM		 89{
90 u64 mask = sample_type & PERF_SAMPLE_MASK;
91 int size = 0;
92 int i;
93
94 for (i = 0; i < 64; i++) {
95 if (mask & (1ULL << i))
96 size++;
97 }
98
99 size *= sizeof(u64);
100
101 return size;
102}
103
75562573
AH		 104/**
105 * __perf_evsel__calc_id_pos - calculate id_pos.
106 * @sample_type: sample type
107 *
108 * This function returns the position of the event id (PERF_SAMPLE_ID or
109 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
110 * sample_event.
111 */
112static int __perf_evsel__calc_id_pos(u64 sample_type)
113{
114 int idx = 0;
115
116 if (sample_type & PERF_SAMPLE_IDENTIFIER)
117 return 0;
118
119 if (!(sample_type & PERF_SAMPLE_ID))
120 return -1;
121
122 if (sample_type & PERF_SAMPLE_IP)
123 idx += 1;
124
125 if (sample_type & PERF_SAMPLE_TID)
126 idx += 1;
127
128 if (sample_type & PERF_SAMPLE_TIME)
129 idx += 1;
130
131 if (sample_type & PERF_SAMPLE_ADDR)
132 idx += 1;
133
134 return idx;
135}
136
137/**
138 * __perf_evsel__calc_is_pos - calculate is_pos.
139 * @sample_type: sample type
140 *
141 * This function returns the position (counting backwards) of the event id
142 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
143 * sample_id_all is used there is an id sample appended to non-sample events.
144 */
145static int __perf_evsel__calc_is_pos(u64 sample_type)
146{
147 int idx = 1;
148
149 if (sample_type & PERF_SAMPLE_IDENTIFIER)
150 return 1;
151
152 if (!(sample_type & PERF_SAMPLE_ID))
153 return -1;
154
155 if (sample_type & PERF_SAMPLE_CPU)
156 idx += 1;
157
158 if (sample_type & PERF_SAMPLE_STREAM_ID)
159 idx += 1;
160
161 return idx;
162}
163
164void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
165{
166 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
167 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
168}
169
7be5ebe8
ACM		 170void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
171 enum perf_event_sample_format bit)
172{
173 if (!(evsel->attr.sample_type & bit)) {
174 evsel->attr.sample_type |= bit;
175 evsel->sample_size += sizeof(u64);
75562573 176 perf_evsel__calc_id_pos(evsel);
7be5ebe8
ACM		 177 }
178}
179
180void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
181 enum perf_event_sample_format bit)
182{
183 if (evsel->attr.sample_type & bit) {
184 evsel->attr.sample_type &= ~bit;
185 evsel->sample_size -= sizeof(u64);
75562573 186 perf_evsel__calc_id_pos(evsel);
7be5ebe8
ACM		 187 }
188}
189
75562573
AH		 190void perf_evsel__set_sample_id(struct perf_evsel *evsel,
191 bool can_sample_identifier)
7a5a5ca5 192{
75562573
AH		 193 if (can_sample_identifier) {
194 perf_evsel__reset_sample_bit(evsel, ID);
195 perf_evsel__set_sample_bit(evsel, IDENTIFIER);
196 } else {
197 perf_evsel__set_sample_bit(evsel, ID);
198 }
7a5a5ca5
ACM		 199 evsel->attr.read_format |= PERF_FORMAT_ID;
200}
201
ef1d1af2
ACM		 202void perf_evsel__init(struct perf_evsel *evsel,
203 struct perf_event_attr *attr, int idx)
204{
205 evsel->idx = idx;
60b0896c 206 evsel->tracking = !idx;
ef1d1af2 207 evsel->attr = *attr;
2cfda562 208 evsel->leader = evsel;
410136f5
SE		 209 evsel->unit = "";
210 evsel->scale = 1.0;
d49e4695 211 evsel->evlist = NULL;
1f45b1d4 212 evsel->bpf_fd = -1;
ef1d1af2 213 INIT_LIST_HEAD(&evsel->node);
930a2e29 214 INIT_LIST_HEAD(&evsel->config_terms);
ce8ccff5 215 perf_evsel__object.init(evsel);
bde09467 216 evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
75562573 217 perf_evsel__calc_id_pos(evsel);
15bfd2cc 218 evsel->cmdline_group_boundary = false;
ef1d1af2
ACM		 219}
220
ef503831 221struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
69aad6f1 222{
ce8ccff5 223 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
69aad6f1 224
ef1d1af2
ACM		 225 if (evsel != NULL)
226 perf_evsel__init(evsel, attr, idx);
69aad6f1 227
03e0a7df
WN		 228 if (perf_evsel__is_bpf_output(evsel)) {
229 evsel->attr.sample_type |= PERF_SAMPLE_RAW;
230 evsel->attr.sample_period = 1;
231 }
232
69aad6f1
ACM		 233 return evsel;
234}
235
8dd2a131
JO		 236/*
237 * Returns pointer with encoded error via <linux/err.h> interface.
238 */
ef503831 239struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
efd2b924 240{
ce8ccff5 241 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
8dd2a131 242 int err = -ENOMEM;
efd2b924 243
8dd2a131
JO		 244 if (evsel == NULL) {
245 goto out_err;
246 } else {
efd2b924 247 struct perf_event_attr attr = {
0b80f8b3
ACM		 248 .type = PERF_TYPE_TRACEPOINT,
249 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
250 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
efd2b924
ACM		 251 };
252
e48ffe2b
ACM		 253 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
254 goto out_free;
255
97978b3e 256 evsel->tp_format = trace_event__tp_format(sys, name);
8dd2a131
JO		 257 if (IS_ERR(evsel->tp_format)) {
258 err = PTR_ERR(evsel->tp_format);
efd2b924 259 goto out_free;
8dd2a131 260 }
efd2b924 261
0b80f8b3 262 event_attr_init(&attr);
efd2b924 263 attr.config = evsel->tp_format->id;
0b80f8b3 264 attr.sample_period = 1;
efd2b924 265 perf_evsel__init(evsel, &attr, idx);
efd2b924
ACM		 266 }
267
268 return evsel;
269
270out_free:
74cf249d 271 zfree(&evsel->name);
efd2b924 272 free(evsel);
8dd2a131
JO		 273out_err:
274 return ERR_PTR(err);
efd2b924
ACM		 275}
276
8ad7013b 277const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
c410431c
ACM		 278 "cycles",
279 "instructions",
280 "cache-references",
281 "cache-misses",
282 "branches",
283 "branch-misses",
284 "bus-cycles",
285 "stalled-cycles-frontend",
286 "stalled-cycles-backend",
287 "ref-cycles",
288};
289
dd4f5223 290static const char *__perf_evsel__hw_name(u64 config)
c410431c
ACM		 291{
292 if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
293 return perf_evsel__hw_names[config];
294
295 return "unknown-hardware";
296}
297
27f18617 298static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
c410431c 299{
27f18617 300 int colon = 0, r = 0;
c410431c 301 struct perf_event_attr *attr = &evsel->attr;
c410431c
ACM		 302 bool exclude_guest_default = false;
303
304#define MOD_PRINT(context, mod) do { \
305 if (!attr->exclude_##context) { \
27f18617 306 if (!colon) colon = ++r; \
c410431c
ACM		 307 r += scnprintf(bf + r, size - r, "%c", mod); \
308 } } while(0)
309
310 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
311 MOD_PRINT(kernel, 'k');
312 MOD_PRINT(user, 'u');
313 MOD_PRINT(hv, 'h');
314 exclude_guest_default = true;
315 }
316
317 if (attr->precise_ip) {
318 if (!colon)
27f18617 319 colon = ++r;
c410431c
ACM		 320 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
321 exclude_guest_default = true;
322 }
323
324 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
325 MOD_PRINT(host, 'H');
326 MOD_PRINT(guest, 'G');
327 }
328#undef MOD_PRINT
329 if (colon)
27f18617 330 bf[colon - 1] = ':';
c410431c
ACM		 331 return r;
332}
333
27f18617
ACM		 334static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
335{
336 int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
337 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
338}
339
8ad7013b 340const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
335c2f5d
ACM		 341 "cpu-clock",
342 "task-clock",
343 "page-faults",
344 "context-switches",
8ad7013b 345 "cpu-migrations",
335c2f5d
ACM		 346 "minor-faults",
347 "major-faults",
348 "alignment-faults",
349 "emulation-faults",
d22d1a2a 350 "dummy",
335c2f5d
ACM		 351};
352
dd4f5223 353static const char *__perf_evsel__sw_name(u64 config)
335c2f5d
ACM		 354{
355 if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
356 return perf_evsel__sw_names[config];
357 return "unknown-software";
358}
359
360static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
361{
362 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
363 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
364}
365
287e74aa
JO		 366static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
367{
368 int r;
369
370 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
371
372 if (type & HW_BREAKPOINT_R)
373 r += scnprintf(bf + r, size - r, "r");
374
375 if (type & HW_BREAKPOINT_W)
376 r += scnprintf(bf + r, size - r, "w");
377
378 if (type & HW_BREAKPOINT_X)
379 r += scnprintf(bf + r, size - r, "x");
380
381 return r;
382}
383
384static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
385{
386 struct perf_event_attr *attr = &evsel->attr;
387 int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
388 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
389}
390
0b668bc9
ACM		 391const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
392 [PERF_EVSEL__MAX_ALIASES] = {
393 { "L1-dcache", "l1-d", "l1d", "L1-data", },
394 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
395 { "LLC", "L2", },
396 { "dTLB", "d-tlb", "Data-TLB", },
397 { "iTLB", "i-tlb", "Instruction-TLB", },
398 { "branch", "branches", "bpu", "btb", "bpc", },
399 { "node", },
400};
401
402const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
403 [PERF_EVSEL__MAX_ALIASES] = {
404 { "load", "loads", "read", },
405 { "store", "stores", "write", },
406 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
407};
408
409const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
410 [PERF_EVSEL__MAX_ALIASES] = {
411 { "refs", "Reference", "ops", "access", },
412 { "misses", "miss", },
413};
414
415#define C(x) PERF_COUNT_HW_CACHE_##x
416#define CACHE_READ (1 << C(OP_READ))
417#define CACHE_WRITE (1 << C(OP_WRITE))
418#define CACHE_PREFETCH (1 << C(OP_PREFETCH))
419#define COP(x) (1 << x)
420
421/*
422 * cache operartion stat
423 * L1I : Read and prefetch only
424 * ITLB and BPU : Read-only
425 */
426static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
427 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
428 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
429 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
430 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
431 [C(ITLB)] = (CACHE_READ),
432 [C(BPU)] = (CACHE_READ),
433 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
434};
435
436bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
437{
438 if (perf_evsel__hw_cache_stat[type] & COP(op))
439 return true; /* valid */
440 else
441 return false; /* invalid */
442}
443
444int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
445 char *bf, size_t size)
446{
447 if (result) {
448 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
449 perf_evsel__hw_cache_op[op][0],
450 perf_evsel__hw_cache_result[result][0]);
451 }
452
453 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
454 perf_evsel__hw_cache_op[op][1]);
455}
456
dd4f5223 457static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
0b668bc9
ACM		 458{
459 u8 op, result, type = (config >> 0) & 0xff;
460 const char *err = "unknown-ext-hardware-cache-type";
461
462 if (type > PERF_COUNT_HW_CACHE_MAX)
463 goto out_err;
464
465 op = (config >> 8) & 0xff;
466 err = "unknown-ext-hardware-cache-op";
467 if (op > PERF_COUNT_HW_CACHE_OP_MAX)
468 goto out_err;
469
470 result = (config >> 16) & 0xff;
471 err = "unknown-ext-hardware-cache-result";
472 if (result > PERF_COUNT_HW_CACHE_RESULT_MAX)
473 goto out_err;
474
475 err = "invalid-cache";
476 if (!perf_evsel__is_cache_op_valid(type, op))
477 goto out_err;
478
479 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
480out_err:
481 return scnprintf(bf, size, "%s", err);
482}
483
484static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
485{
486 int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
487 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
488}
489
6eef3d9c
ACM		 490static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
491{
492 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
493 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
494}
495
7289f83c 496const char *perf_evsel__name(struct perf_evsel *evsel)
a4460836 497{
7289f83c 498 char bf[128];
a4460836 499
7289f83c
ACM		 500 if (evsel->name)
501 return evsel->name;
c410431c
ACM		 502
503 switch (evsel->attr.type) {
504 case PERF_TYPE_RAW:
6eef3d9c 505 perf_evsel__raw_name(evsel, bf, sizeof(bf));
c410431c
ACM		 506 break;
507
508 case PERF_TYPE_HARDWARE:
7289f83c 509 perf_evsel__hw_name(evsel, bf, sizeof(bf));
c410431c 510 break;
0b668bc9
ACM		 511
512 case PERF_TYPE_HW_CACHE:
7289f83c 513 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
0b668bc9
ACM		 514 break;
515
335c2f5d 516 case PERF_TYPE_SOFTWARE:
7289f83c 517 perf_evsel__sw_name(evsel, bf, sizeof(bf));
335c2f5d
ACM		 518 break;
519
a4460836 520 case PERF_TYPE_TRACEPOINT:
7289f83c 521 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
a4460836
ACM		 522 break;
523
287e74aa
JO		 524 case PERF_TYPE_BREAKPOINT:
525 perf_evsel__bp_name(evsel, bf, sizeof(bf));
526 break;
527
c410431c 528 default:
ca1b1457
RR		 529 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
530 evsel->attr.type);
a4460836 531 break;
c410431c
ACM		 532 }
533
7289f83c
ACM		 534 evsel->name = strdup(bf);
535
536 return evsel->name ?: "unknown";
c410431c
ACM		 537}
538
717e263f
NK		 539const char *perf_evsel__group_name(struct perf_evsel *evsel)
540{
541 return evsel->group_name ?: "anon group";
542}
543
544int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
545{
546 int ret;
547 struct perf_evsel *pos;
548 const char *group_name = perf_evsel__group_name(evsel);
549
550 ret = scnprintf(buf, size, "%s", group_name);
551
552 ret += scnprintf(buf + ret, size - ret, " { %s",
553 perf_evsel__name(evsel));
554
555 for_each_group_member(pos, evsel)
556 ret += scnprintf(buf + ret, size - ret, ", %s",
557 perf_evsel__name(pos));
558
559 ret += scnprintf(buf + ret, size - ret, " }");
560
561 return ret;
562}
563
6bedfab6 564static void
aad2b21c 565perf_evsel__config_callgraph(struct perf_evsel *evsel,
c3a6a8c4
KL		 566 struct record_opts *opts,
567 struct callchain_param *param)
6bedfab6
JO		 568{
569 bool function = perf_evsel__is_function_event(evsel);
570 struct perf_event_attr *attr = &evsel->attr;
571
572 perf_evsel__set_sample_bit(evsel, CALLCHAIN);
573
c3a6a8c4 574 if (param->record_mode == CALLCHAIN_LBR) {
aad2b21c
KL		 575 if (!opts->branch_stack) {
576 if (attr->exclude_user) {
577 pr_warning("LBR callstack option is only available "
578 "to get user callchain information. "
579 "Falling back to framepointers.\n");
580 } else {
581 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
582 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
bd0f8895
AK		 583 PERF_SAMPLE_BRANCH_CALL_STACK |
584 PERF_SAMPLE_BRANCH_NO_CYCLES |
585 PERF_SAMPLE_BRANCH_NO_FLAGS;
aad2b21c
KL		 586 }
587 } else
588 pr_warning("Cannot use LBR callstack with branch stack. "
589 "Falling back to framepointers.\n");
590 }
591
c3a6a8c4 592 if (param->record_mode == CALLCHAIN_DWARF) {
6bedfab6
JO		 593 if (!function) {
594 perf_evsel__set_sample_bit(evsel, REGS_USER);
595 perf_evsel__set_sample_bit(evsel, STACK_USER);
596 attr->sample_regs_user = PERF_REGS_MASK;
c3a6a8c4 597 attr->sample_stack_user = param->dump_size;
6bedfab6
JO		 598 attr->exclude_callchain_user = 1;
599 } else {
600 pr_info("Cannot use DWARF unwind for function trace event,"
601 " falling back to framepointers.\n");
602 }
603 }
604
605 if (function) {
606 pr_info("Disabling user space callchains for function trace event.\n");
607 attr->exclude_callchain_user = 1;
608 }
609}
610
d457c963
KL		 611static void
612perf_evsel__reset_callgraph(struct perf_evsel *evsel,
613 struct callchain_param *param)
614{
615 struct perf_event_attr *attr = &evsel->attr;
616
617 perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
618 if (param->record_mode == CALLCHAIN_LBR) {
619 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
620 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
621 PERF_SAMPLE_BRANCH_CALL_STACK);
622 }
623 if (param->record_mode == CALLCHAIN_DWARF) {
624 perf_evsel__reset_sample_bit(evsel, REGS_USER);
625 perf_evsel__reset_sample_bit(evsel, STACK_USER);
626 }
627}
628
629static void apply_config_terms(struct perf_evsel *evsel,
630 struct record_opts *opts)
930a2e29
JO		 631{
632 struct perf_evsel_config_term *term;
32067712
KL		 633 struct list_head *config_terms = &evsel->config_terms;
634 struct perf_event_attr *attr = &evsel->attr;
d457c963
KL		 635 struct callchain_param param;
636 u32 dump_size = 0;
637 char *callgraph_buf = NULL;
638
639 /* callgraph default */
640 param.record_mode = callchain_param.record_mode;
930a2e29
JO		 641
642 list_for_each_entry(term, config_terms, list) {
643 switch (term->type) {
ee4c7588
JO		 644 case PERF_EVSEL__CONFIG_TERM_PERIOD:
645 attr->sample_period = term->val.period;
ab35a7d0 646 attr->freq = 0;
32067712 647 break;
09af2a55
NK		 648 case PERF_EVSEL__CONFIG_TERM_FREQ:
649 attr->sample_freq = term->val.freq;
650 attr->freq = 1;
651 break;
32067712
KL		 652 case PERF_EVSEL__CONFIG_TERM_TIME:
653 if (term->val.time)
654 perf_evsel__set_sample_bit(evsel, TIME);
655 else
656 perf_evsel__reset_sample_bit(evsel, TIME);
657 break;
d457c963
KL		 658 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
659 callgraph_buf = term->val.callgraph;
660 break;
661 case PERF_EVSEL__CONFIG_TERM_STACK_USER:
662 dump_size = term->val.stack_user;
663 break;
374ce938
WN		 664 case PERF_EVSEL__CONFIG_TERM_INHERIT:
665 /*
666 * attr->inherit should has already been set by
667 * perf_evsel__config. If user explicitly set
668 * inherit using config terms, override global
669 * opt->no_inherit setting.
670 */
671 attr->inherit = term->val.inherit ? 1 : 0;
672 break;
930a2e29
JO		 673 default:
674 break;
675 }
676 }
d457c963
KL		 677
678 /* User explicitly set per-event callgraph, clear the old setting and reset. */
679 if ((callgraph_buf != NULL) || (dump_size > 0)) {
680
681 /* parse callgraph parameters */
682 if (callgraph_buf != NULL) {
f9db0d0f
KL		 683 if (!strcmp(callgraph_buf, "no")) {
684 param.enabled = false;
685 param.record_mode = CALLCHAIN_NONE;
686 } else {
687 param.enabled = true;
688 if (parse_callchain_record(callgraph_buf, &param)) {
689 pr_err("per-event callgraph setting for %s failed. "
690 "Apply callgraph global setting for it\n",
691 evsel->name);
692 return;
693 }
d457c963
KL		 694 }
695 }
696 if (dump_size > 0) {
697 dump_size = round_up(dump_size, sizeof(u64));
698 param.dump_size = dump_size;
699 }
700
701 /* If global callgraph set, clear it */
702 if (callchain_param.enabled)
703 perf_evsel__reset_callgraph(evsel, &callchain_param);
704
705 /* set perf-event callgraph */
706 if (param.enabled)
707 perf_evsel__config_callgraph(evsel, opts, &param);
708 }
930a2e29
JO		 709}
710
774cb499
JO		 711/*
712 * The enable_on_exec/disabled value strategy:
713 *
714 * 1) For any type of traced program:
715 * - all independent events and group leaders are disabled
716 * - all group members are enabled
717 *
718 * Group members are ruled by group leaders. They need to
719 * be enabled, because the group scheduling relies on that.
720 *
721 * 2) For traced programs executed by perf:
722 * - all independent events and group leaders have
723 * enable_on_exec set
724 * - we don't specifically enable or disable any event during
725 * the record command
726 *
727 * Independent events and group leaders are initially disabled
728 * and get enabled by exec. Group members are ruled by group
729 * leaders as stated in 1).
730 *
731 * 3) For traced programs attached by perf (pid/tid):
732 * - we specifically enable or disable all events during
733 * the record command
734 *
735 * When attaching events to already running traced we
736 * enable/disable events specifically, as there's no
737 * initial traced exec call.
738 */
b4006796 739void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
0f82ebc4 740{
3c176311 741 struct perf_evsel *leader = evsel->leader;
0f82ebc4 742 struct perf_event_attr *attr = &evsel->attr;
60b0896c 743 int track = evsel->tracking;
3aa5939d 744 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
0f82ebc4 745
594ac61a 746 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
0f82ebc4 747 attr->inherit = !opts->no_inherit;
0f82ebc4 748
7be5ebe8
ACM		 749 perf_evsel__set_sample_bit(evsel, IP);
750 perf_evsel__set_sample_bit(evsel, TID);
0f82ebc4 751
3c176311
JO		 752 if (evsel->sample_read) {
753 perf_evsel__set_sample_bit(evsel, READ);
754
755 /*
756 * We need ID even in case of single event, because
757 * PERF_SAMPLE_READ process ID specific data.
758 */
75562573 759 perf_evsel__set_sample_id(evsel, false);
3c176311
JO		 760
761 /*
762 * Apply group format only if we belong to group
763 * with more than one members.
764 */
765 if (leader->nr_members > 1) {
766 attr->read_format |= PERF_FORMAT_GROUP;
767 attr->inherit = 0;
768 }
769 }
770
0f82ebc4 771 /*
17314e23 772 * We default some events to have a default interval. But keep
0f82ebc4
ACM		 773 * it a weak assumption overridable by the user.
774 */
17314e23 775 if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
0f82ebc4
ACM		 776 opts->user_interval != ULLONG_MAX)) {
777 if (opts->freq) {
7be5ebe8 778 perf_evsel__set_sample_bit(evsel, PERIOD);
0f82ebc4
ACM		 779 attr->freq = 1;
780 attr->sample_freq = opts->freq;
781 } else {
782 attr->sample_period = opts->default_interval;
783 }
784 }
785
3c176311
JO		 786 /*
787 * Disable sampling for all group members other
788 * than leader in case leader 'leads' the sampling.
789 */
790 if ((leader != evsel) && leader->sample_read) {
791 attr->sample_freq = 0;
792 attr->sample_period = 0;
793 }
794
0f82ebc4
ACM		 795 if (opts->no_samples)
796 attr->sample_freq = 0;
797
798 if (opts->inherit_stat)
799 attr->inherit_stat = 1;
800
801 if (opts->sample_address) {
7be5ebe8 802 perf_evsel__set_sample_bit(evsel, ADDR);
0f82ebc4
ACM		 803 attr->mmap_data = track;
804 }
805
f140373b
JO		 806 /*
807 * We don't allow user space callchains for function trace
808 * event, due to issues with page faults while tracing page
809 * fault handler and its overall trickiness nature.
810 */
811 if (perf_evsel__is_function_event(evsel))
812 evsel->attr.exclude_callchain_user = 1;
813
72a128aa 814 if (callchain_param.enabled && !evsel->no_aux_samples)
c3a6a8c4 815 perf_evsel__config_callgraph(evsel, opts, &callchain_param);
26d33022 816
6a21c0b5 817 if (opts->sample_intr_regs) {
bcc84ec6 818 attr->sample_regs_intr = opts->sample_intr_regs;
6a21c0b5
SE		 819 perf_evsel__set_sample_bit(evsel, REGS_INTR);
820 }
821
3aa5939d 822 if (target__has_cpu(&opts->target))
7be5ebe8 823 perf_evsel__set_sample_bit(evsel, CPU);
0f82ebc4 824
3e76ac78 825 if (opts->period)
7be5ebe8 826 perf_evsel__set_sample_bit(evsel, PERIOD);
3e76ac78 827
8affc2b8
AK		 828 /*
829 * When the user explicitely disabled time don't force it here.
830 */
831 if (opts->sample_time &&
832 (!perf_missing_features.sample_id_all &&
3abebc55
AH		 833 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
834 opts->sample_time_set)))
7be5ebe8 835 perf_evsel__set_sample_bit(evsel, TIME);
0f82ebc4 836
6ff1ce76 837 if (opts->raw_samples && !evsel->no_aux_samples) {
7be5ebe8
ACM		 838 perf_evsel__set_sample_bit(evsel, TIME);
839 perf_evsel__set_sample_bit(evsel, RAW);
840 perf_evsel__set_sample_bit(evsel, CPU);
0f82ebc4
ACM		 841 }
842
ccf49bfc 843 if (opts->sample_address)
1e7ed5ec 844 perf_evsel__set_sample_bit(evsel, DATA_SRC);
ccf49bfc 845
509051ea 846 if (opts->no_buffering) {
0f82ebc4
ACM		 847 attr->watermark = 0;
848 attr->wakeup_events = 1;
849 }
6ff1ce76 850 if (opts->branch_stack && !evsel->no_aux_samples) {
7be5ebe8 851 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
bdfebd84
RAV		 852 attr->branch_sample_type = opts->branch_stack;
853 }
0f82ebc4 854
05484298 855 if (opts->sample_weight)
1e7ed5ec 856 perf_evsel__set_sample_bit(evsel, WEIGHT);
05484298 857
62e503b7 858 attr->task = track;
5c5e854b 859 attr->mmap = track;
a5a5ba72 860 attr->mmap2 = track && !perf_missing_features.mmap2;
5c5e854b 861 attr->comm = track;
0f82ebc4 862
b757bb09
AH		 863 if (opts->record_switch_events)
864 attr->context_switch = track;
865
475eeab9 866 if (opts->sample_transaction)
1e7ed5ec 867 perf_evsel__set_sample_bit(evsel, TRANSACTION);
475eeab9 868
85c273d2
AK		 869 if (opts->running_time) {
870 evsel->attr.read_format |=
871 PERF_FORMAT_TOTAL_TIME_ENABLED |
872 PERF_FORMAT_TOTAL_TIME_RUNNING;
873 }
874
774cb499
JO		 875 /*
876 * XXX see the function comment above
877 *
878 * Disabling only independent events or group leaders,
879 * keeping group members enabled.
880 */
823254ed 881 if (perf_evsel__is_group_leader(evsel))
774cb499
JO		 882 attr->disabled = 1;
883
884 /*
885 * Setting enable_on_exec for independent events and
886 * group leaders for traced executed by perf.
887 */
6619a53e
AK		 888 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
889 !opts->initial_delay)
0f82ebc4 890 attr->enable_on_exec = 1;
2afd2bcf
AH		 891
892 if (evsel->immediate) {
893 attr->disabled = 0;
894 attr->enable_on_exec = 0;
895 }
814c8c38
PZ		 896
897 clockid = opts->clockid;
898 if (opts->use_clockid) {
899 attr->use_clockid = 1;
900 attr->clockid = opts->clockid;
901 }
930a2e29 902
7f94af7a
JO		 903 if (evsel->precise_max)
904 perf_event_attr__set_max_precise_ip(attr);
905
85723885
JO		 906 if (opts->all_user) {
907 attr->exclude_kernel = 1;
908 attr->exclude_user = 0;
909 }
910
911 if (opts->all_kernel) {
912 attr->exclude_kernel = 0;
913 attr->exclude_user = 1;
914 }
915
930a2e29
JO		 916 /*
917 * Apply event specific term settings,
918 * it overloads any global configuration.
919 */
d457c963 920 apply_config_terms(evsel, opts);
0f82ebc4
ACM		 921}
922
8885846f 923static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
69aad6f1 924{
4af4c955 925 int cpu, thread;
bf8e8f4b
AH		 926
927 if (evsel->system_wide)
928 nthreads = 1;
929
69aad6f1 930 evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
4af4c955
DA		 931
932 if (evsel->fd) {
933 for (cpu = 0; cpu < ncpus; cpu++) {
934 for (thread = 0; thread < nthreads; thread++) {
935 FD(evsel, cpu, thread) = -1;
936 }
937 }
938 }
939
69aad6f1
ACM		 940 return evsel->fd != NULL ? 0 : -ENOMEM;
941}
942
e2407bef
AK		 943static int perf_evsel__run_ioctl(struct perf_evsel *evsel, int ncpus, int nthreads,
944 int ioc, void *arg)
745cefc5
ACM		 945{
946 int cpu, thread;
947
bf8e8f4b
AH		 948 if (evsel->system_wide)
949 nthreads = 1;
950
745cefc5
ACM		 951 for (cpu = 0; cpu < ncpus; cpu++) {
952 for (thread = 0; thread < nthreads; thread++) {
953 int fd = FD(evsel, cpu, thread),
e2407bef 954 err = ioctl(fd, ioc, arg);
745cefc5
ACM		 955
956 if (err)
957 return err;
958 }
959 }
960
961 return 0;
962}
963
f47805a2
ACM		 964int perf_evsel__apply_filter(struct perf_evsel *evsel, int ncpus, int nthreads,
965 const char *filter)
e2407bef
AK		 966{
967 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
968 PERF_EVENT_IOC_SET_FILTER,
969 (void *)filter);
970}
971
12467ae4
ACM		 972int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
973{
974 char *new_filter = strdup(filter);
975
976 if (new_filter != NULL) {
977 free(evsel->filter);
978 evsel->filter = new_filter;
979 return 0;
980 }
981
982 return -1;
983}
984
64ec84f5
ACM		 985int perf_evsel__append_filter(struct perf_evsel *evsel,
986 const char *op, const char *filter)
987{
988 char *new_filter;
989
990 if (evsel->filter == NULL)
991 return perf_evsel__set_filter(evsel, filter);
992
993 if (asprintf(&new_filter,"(%s) %s (%s)", evsel->filter, op, filter) > 0) {
994 free(evsel->filter);
995 evsel->filter = new_filter;
996 return 0;
997 }
998
999 return -1;
1000}
1001
5cd95fc3 1002int perf_evsel__enable(struct perf_evsel *evsel)
e2407bef 1003{
5cd95fc3
JO		 1004 int nthreads = thread_map__nr(evsel->threads);
1005 int ncpus = cpu_map__nr(evsel->cpus);
1006
e2407bef
AK		 1007 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
1008 PERF_EVENT_IOC_ENABLE,
1009 0);
1010}
1011
e98a4cbb
JO		 1012int perf_evsel__disable(struct perf_evsel *evsel)
1013{
1014 int nthreads = thread_map__nr(evsel->threads);
1015 int ncpus = cpu_map__nr(evsel->cpus);
1016
1017 return perf_evsel__run_ioctl(evsel, ncpus, nthreads,
1018 PERF_EVENT_IOC_DISABLE,
1019 0);
1020}
1021
70db7533
ACM		 1022int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
1023{
8d9cbd8f
VG		 1024 if (ncpus == 0 || nthreads == 0)
1025 return 0;
1026
bf8e8f4b
AH		 1027 if (evsel->system_wide)
1028 nthreads = 1;
1029
a91e5431
ACM		 1030 evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
1031 if (evsel->sample_id == NULL)
1032 return -ENOMEM;
1033
1034 evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
1035 if (evsel->id == NULL) {
1036 xyarray__delete(evsel->sample_id);
1037 evsel->sample_id = NULL;
1038 return -ENOMEM;
1039 }
1040
1041 return 0;
70db7533
ACM		 1042}
1043
8885846f 1044static void perf_evsel__free_fd(struct perf_evsel *evsel)
69aad6f1
ACM		 1045{
1046 xyarray__delete(evsel->fd);
1047 evsel->fd = NULL;
1048}
1049
8885846f 1050static void perf_evsel__free_id(struct perf_evsel *evsel)
70db7533 1051{
a91e5431
ACM		 1052 xyarray__delete(evsel->sample_id);
1053 evsel->sample_id = NULL;
04662523 1054 zfree(&evsel->id);
70db7533
ACM		 1055}
1056
930a2e29
JO		 1057static void perf_evsel__free_config_terms(struct perf_evsel *evsel)
1058{
1059 struct perf_evsel_config_term *term, *h;
1060
1061 list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1062 list_del(&term->list);
1063 free(term);
1064 }
1065}
1066
c52b12ed
ACM		 1067void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
1068{
1069 int cpu, thread;
1070
bf8e8f4b
AH		 1071 if (evsel->system_wide)
1072 nthreads = 1;
1073
c52b12ed
ACM		 1074 for (cpu = 0; cpu < ncpus; cpu++)
1075 for (thread = 0; thread < nthreads; ++thread) {
1076 close(FD(evsel, cpu, thread));
1077 FD(evsel, cpu, thread) = -1;
1078 }
1079}
1080
ef1d1af2 1081void perf_evsel__exit(struct perf_evsel *evsel)
69aad6f1
ACM		 1082{
1083 assert(list_empty(&evsel->node));
d49e4695 1084 assert(evsel->evlist == NULL);
736b05a0
NK		 1085 perf_evsel__free_fd(evsel);
1086 perf_evsel__free_id(evsel);
930a2e29 1087 perf_evsel__free_config_terms(evsel);
597e48c1 1088 close_cgroup(evsel->cgrp);
f30a79b0 1089 cpu_map__put(evsel->cpus);
fce4d296 1090 cpu_map__put(evsel->own_cpus);
578e91ec 1091 thread_map__put(evsel->threads);
597e48c1 1092 zfree(&evsel->group_name);
597e48c1 1093 zfree(&evsel->name);
ce8ccff5 1094 perf_evsel__object.fini(evsel);
ef1d1af2
ACM		 1095}
1096
1097void perf_evsel__delete(struct perf_evsel *evsel)
1098{
1099 perf_evsel__exit(evsel);
69aad6f1
ACM		 1100 free(evsel);
1101}
c52b12ed 1102
a6fa0038 1103void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu, int thread,
857a94a2 1104 struct perf_counts_values *count)
c7a79c47
SE		 1105{
1106 struct perf_counts_values tmp;
1107
1108 if (!evsel->prev_raw_counts)
1109 return;
1110
1111 if (cpu == -1) {
1112 tmp = evsel->prev_raw_counts->aggr;
1113 evsel->prev_raw_counts->aggr = *count;
1114 } else {
a6fa0038
JO		 1115 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1116 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
c7a79c47
SE		 1117 }
1118
1119 count->val = count->val - tmp.val;
1120 count->ena = count->ena - tmp.ena;
1121 count->run = count->run - tmp.run;
1122}
1123
13112bbf
JO		 1124void perf_counts_values__scale(struct perf_counts_values *count,
1125 bool scale, s8 *pscaled)
1126{
1127 s8 scaled = 0;
1128
1129 if (scale) {
1130 if (count->run == 0) {
1131 scaled = -1;
1132 count->val = 0;
1133 } else if (count->run < count->ena) {
1134 scaled = 1;
1135 count->val = (u64)((double) count->val * count->ena / count->run + 0.5);
1136 }
1137 } else
1138 count->ena = count->run = 0;
1139
1140 if (pscaled)
1141 *pscaled = scaled;
1142}
1143
f99f4719
JO		 1144int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
1145 struct perf_counts_values *count)
1146{
1147 memset(count, 0, sizeof(*count));
1148
1149 if (FD(evsel, cpu, thread) < 0)
1150 return -EINVAL;
1151
1152 if (readn(FD(evsel, cpu, thread), count, sizeof(*count)) < 0)
1153 return -errno;
1154
1155 return 0;
1156}
1157
c52b12ed
ACM		 1158int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
1159 int cpu, int thread, bool scale)
1160{
1161 struct perf_counts_values count;
1162 size_t nv = scale ? 3 : 1;
1163
1164 if (FD(evsel, cpu, thread) < 0)
1165 return -EINVAL;
1166
a6fa0038 1167 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
4eed11d5
ACM		 1168 return -ENOMEM;
1169
c52b12ed
ACM		 1170 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
1171 return -errno;
1172
a6fa0038 1173 perf_evsel__compute_deltas(evsel, cpu, thread, &count);
13112bbf 1174 perf_counts_values__scale(&count, scale, NULL);
a6fa0038 1175 *perf_counts(evsel->counts, cpu, thread) = count;
c52b12ed
ACM		 1176 return 0;
1177}
1178
6a4bb04c
JO		 1179static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
1180{
1181 struct perf_evsel *leader = evsel->leader;
1182 int fd;
1183
823254ed 1184 if (perf_evsel__is_group_leader(evsel))
6a4bb04c
JO		 1185 return -1;
1186
1187 /*
1188 * Leader must be already processed/open,
1189 * if not it's a bug.
1190 */
1191 BUG_ON(!leader->fd);
1192
1193 fd = FD(leader, cpu, thread);
1194 BUG_ON(fd == -1);
1195
1196 return fd;
1197}
1198
2c5e8c52
PZ		 1199struct bit_names {
1200 int bit;
1201 const char *name;
1202};
1203
1204static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits)
1205{
1206 bool first_bit = true;
1207 int i = 0;
1208
1209 do {
1210 if (value & bits[i].bit) {
1211 buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name);
1212 first_bit = false;
1213 }
1214 } while (bits[++i].name != NULL);
1215}
1216
1217static void __p_sample_type(char *buf, size_t size, u64 value)
1218{
1219#define bit_name(n) { PERF_SAMPLE_##n, #n }
1220 struct bit_names bits[] = {
1221 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
1222 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
1223 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
1224 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
84422592 1225 bit_name(IDENTIFIER), bit_name(REGS_INTR), bit_name(DATA_SRC),
dcdd184b 1226 bit_name(WEIGHT),
2c5e8c52
PZ		 1227 { .name = NULL, }
1228 };
1229#undef bit_name
1230 __p_bits(buf, size, value, bits);
1231}
1232
1233static void __p_read_format(char *buf, size_t size, u64 value)
1234{
1235#define bit_name(n) { PERF_FORMAT_##n, #n }
1236 struct bit_names bits[] = {
1237 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
1238 bit_name(ID), bit_name(GROUP),
1239 { .name = NULL, }
1240 };
1241#undef bit_name
1242 __p_bits(buf, size, value, bits);
1243}
1244
1245#define BUF_SIZE 1024
1246
7310aed7 1247#define p_hex(val) snprintf(buf, BUF_SIZE, "%#"PRIx64, (uint64_t)(val))
2c5e8c52
PZ		 1248#define p_unsigned(val) snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val))
1249#define p_signed(val) snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val))
1250#define p_sample_type(val) __p_sample_type(buf, BUF_SIZE, val)
1251#define p_read_format(val) __p_read_format(buf, BUF_SIZE, val)
1252
1253#define PRINT_ATTRn(_n, _f, _p) \
1254do { \
1255 if (attr->_f) { \
1256 _p(attr->_f); \
1257 ret += attr__fprintf(fp, _n, buf, priv);\
1258 } \
1259} while (0)
1260
1261#define PRINT_ATTRf(_f, _p) PRINT_ATTRn(#_f, _f, _p)
1262
1263int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
1264 attr__fprintf_f attr__fprintf, void *priv)
1265{
1266 char buf[BUF_SIZE];
1267 int ret = 0;
1268
1269 PRINT_ATTRf(type, p_unsigned);
1270 PRINT_ATTRf(size, p_unsigned);
1271 PRINT_ATTRf(config, p_hex);
1272 PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned);
1273 PRINT_ATTRf(sample_type, p_sample_type);
1274 PRINT_ATTRf(read_format, p_read_format);
1275
1276 PRINT_ATTRf(disabled, p_unsigned);
1277 PRINT_ATTRf(inherit, p_unsigned);
1278 PRINT_ATTRf(pinned, p_unsigned);
1279 PRINT_ATTRf(exclusive, p_unsigned);
1280 PRINT_ATTRf(exclude_user, p_unsigned);
1281 PRINT_ATTRf(exclude_kernel, p_unsigned);
1282 PRINT_ATTRf(exclude_hv, p_unsigned);
1283 PRINT_ATTRf(exclude_idle, p_unsigned);
1284 PRINT_ATTRf(mmap, p_unsigned);
1285 PRINT_ATTRf(comm, p_unsigned);
1286 PRINT_ATTRf(freq, p_unsigned);
1287 PRINT_ATTRf(inherit_stat, p_unsigned);
1288 PRINT_ATTRf(enable_on_exec, p_unsigned);
1289 PRINT_ATTRf(task, p_unsigned);
1290 PRINT_ATTRf(watermark, p_unsigned);
1291 PRINT_ATTRf(precise_ip, p_unsigned);
1292 PRINT_ATTRf(mmap_data, p_unsigned);
1293 PRINT_ATTRf(sample_id_all, p_unsigned);
1294 PRINT_ATTRf(exclude_host, p_unsigned);
1295 PRINT_ATTRf(exclude_guest, p_unsigned);
1296 PRINT_ATTRf(exclude_callchain_kernel, p_unsigned);
1297 PRINT_ATTRf(exclude_callchain_user, p_unsigned);
1298 PRINT_ATTRf(mmap2, p_unsigned);
1299 PRINT_ATTRf(comm_exec, p_unsigned);
1300 PRINT_ATTRf(use_clockid, p_unsigned);
0286039f 1301 PRINT_ATTRf(context_switch, p_unsigned);
2c5e8c52
PZ		 1302
1303 PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
1304 PRINT_ATTRf(bp_type, p_unsigned);
1305 PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex);
1306 PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex);
8b8cde49 1307 PRINT_ATTRf(branch_sample_type, p_unsigned);
2c5e8c52
PZ		 1308 PRINT_ATTRf(sample_regs_user, p_hex);
1309 PRINT_ATTRf(sample_stack_user, p_unsigned);
1310 PRINT_ATTRf(clockid, p_signed);
1311 PRINT_ATTRf(sample_regs_intr, p_hex);
70d73de4 1312 PRINT_ATTRf(aux_watermark, p_unsigned);
e3e1a54f
AH		 1313
1314 return ret;
1315}
1316
2c5e8c52
PZ		 1317static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1318 void *priv __attribute__((unused)))
1319{
1320 return fprintf(fp, " %-32s %s\n", name, val);
1321}
1322
0252208e 1323static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
6a4bb04c 1324 struct thread_map *threads)
48290609 1325{
bf8e8f4b 1326 int cpu, thread, nthreads;
57480d2c 1327 unsigned long flags = PERF_FLAG_FD_CLOEXEC;
727ab04e 1328 int pid = -1, err;
bec19672 1329 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
48290609 1330
bf8e8f4b
AH		 1331 if (evsel->system_wide)
1332 nthreads = 1;
1333 else
1334 nthreads = threads->nr;
1335
0252208e 1336 if (evsel->fd == NULL &&
bf8e8f4b 1337 perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0)
727ab04e 1338 return -ENOMEM;
4eed11d5 1339
023695d9 1340 if (evsel->cgrp) {
57480d2c 1341 flags |= PERF_FLAG_PID_CGROUP;
023695d9
SE		 1342 pid = evsel->cgrp->fd;
1343 }
1344
594ac61a 1345fallback_missing_features:
814c8c38
PZ		 1346 if (perf_missing_features.clockid_wrong)
1347 evsel->attr.clockid = CLOCK_MONOTONIC; /* should always work */
1348 if (perf_missing_features.clockid) {
1349 evsel->attr.use_clockid = 0;
1350 evsel->attr.clockid = 0;
1351 }
57480d2c
YD		 1352 if (perf_missing_features.cloexec)
1353 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
5c5e854b
SE		 1354 if (perf_missing_features.mmap2)
1355 evsel->attr.mmap2 = 0;
594ac61a
ACM		 1356 if (perf_missing_features.exclude_guest)
1357 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
bd0f8895
AK		 1358 if (perf_missing_features.lbr_flags)
1359 evsel->attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1360 PERF_SAMPLE_BRANCH_NO_CYCLES);
594ac61a
ACM		 1361retry_sample_id:
1362 if (perf_missing_features.sample_id_all)
1363 evsel->attr.sample_id_all = 0;
1364
2c5e8c52
PZ		 1365 if (verbose >= 2) {
1366 fprintf(stderr, "%.60s\n", graph_dotted_line);
1367 fprintf(stderr, "perf_event_attr:\n");
1368 perf_event_attr__fprintf(stderr, &evsel->attr, __open_attr__fprintf, NULL);
1369 fprintf(stderr, "%.60s\n", graph_dotted_line);
1370 }
e3e1a54f 1371
86bd5e86 1372 for (cpu = 0; cpu < cpus->nr; cpu++) {
9d04f178 1373
bf8e8f4b 1374 for (thread = 0; thread < nthreads; thread++) {
6a4bb04c 1375 int group_fd;
023695d9 1376
bf8e8f4b 1377 if (!evsel->cgrp && !evsel->system_wide)
e13798c7 1378 pid = thread_map__pid(threads, thread);
023695d9 1379
6a4bb04c 1380 group_fd = get_group_fd(evsel, cpu, thread);
bec19672 1381retry_open:
a33f6efc 1382 pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx\n",
e3e1a54f
AH		 1383 pid, cpus->map[cpu], group_fd, flags);
1384
0252208e 1385 FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
023695d9 1386 pid,
f08199d3 1387 cpus->map[cpu],
023695d9 1388 group_fd, flags);
727ab04e
ACM		 1389 if (FD(evsel, cpu, thread) < 0) {
1390 err = -errno;
a33f6efc 1391 pr_debug2("sys_perf_event_open failed, error %d\n",
f852fd62 1392 err);
594ac61a 1393 goto try_fallback;
727ab04e 1394 }
1f45b1d4
WN		 1395
1396 if (evsel->bpf_fd >= 0) {
1397 int evt_fd = FD(evsel, cpu, thread);
1398 int bpf_fd = evsel->bpf_fd;
1399
1400 err = ioctl(evt_fd,
1401 PERF_EVENT_IOC_SET_BPF,
1402 bpf_fd);
1403 if (err && errno != EEXIST) {
1404 pr_err("failed to attach bpf fd %d: %s\n",
1405 bpf_fd, strerror(errno));
1406 err = -EINVAL;
1407 goto out_close;
1408 }
1409 }
1410
bec19672 1411 set_rlimit = NO_CHANGE;
814c8c38
PZ		 1412
1413 /*
1414 * If we succeeded but had to kill clockid, fail and
1415 * have perf_evsel__open_strerror() print us a nice
1416 * error.
1417 */
1418 if (perf_missing_features.clockid ||
1419 perf_missing_features.clockid_wrong) {
1420 err = -EINVAL;
1421 goto out_close;
1422 }
0252208e 1423 }
48290609
ACM		 1424 }
1425
1426 return 0;
1427
594ac61a 1428try_fallback:
bec19672
AK		 1429 /*
1430 * perf stat needs between 5 and 22 fds per CPU. When we run out
1431 * of them try to increase the limits.
1432 */
1433 if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1434 struct rlimit l;
1435 int old_errno = errno;
1436
1437 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1438 if (set_rlimit == NO_CHANGE)
1439 l.rlim_cur = l.rlim_max;
1440 else {
1441 l.rlim_cur = l.rlim_max + 1000;
1442 l.rlim_max = l.rlim_cur;
1443 }
1444 if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1445 set_rlimit++;
1446 errno = old_errno;
1447 goto retry_open;
1448 }
1449 }
1450 errno = old_errno;
1451 }
1452
594ac61a
ACM		 1453 if (err != -EINVAL || cpu > 0 || thread > 0)
1454 goto out_close;
1455
814c8c38
PZ		 1456 /*
1457 * Must probe features in the order they were added to the
1458 * perf_event_attr interface.
1459 */
1460 if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) {
1461 perf_missing_features.clockid_wrong = true;
1462 goto fallback_missing_features;
1463 } else if (!perf_missing_features.clockid && evsel->attr.use_clockid) {
1464 perf_missing_features.clockid = true;
1465 goto fallback_missing_features;
1466 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
57480d2c
YD		 1467 perf_missing_features.cloexec = true;
1468 goto fallback_missing_features;
1469 } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
5c5e854b
SE		 1470 perf_missing_features.mmap2 = true;
1471 goto fallback_missing_features;
1472 } else if (!perf_missing_features.exclude_guest &&
1473 (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
594ac61a
ACM		 1474 perf_missing_features.exclude_guest = true;
1475 goto fallback_missing_features;
1476 } else if (!perf_missing_features.sample_id_all) {
1477 perf_missing_features.sample_id_all = true;
1478 goto retry_sample_id;
bd0f8895
AK		 1479 } else if (!perf_missing_features.lbr_flags &&
1480 (evsel->attr.branch_sample_type &
1481 (PERF_SAMPLE_BRANCH_NO_CYCLES |
1482 PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1483 perf_missing_features.lbr_flags = true;
1484 goto fallback_missing_features;
594ac61a
ACM		 1485 }
1486
48290609 1487out_close:
0252208e
ACM		 1488 do {
1489 while (--thread >= 0) {
1490 close(FD(evsel, cpu, thread));
1491 FD(evsel, cpu, thread) = -1;
1492 }
bf8e8f4b 1493 thread = nthreads;
0252208e 1494 } while (--cpu >= 0);
727ab04e
ACM		 1495 return err;
1496}
1497
1498void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads)
1499{
1500 if (evsel->fd == NULL)
1501 return;
1502
1503 perf_evsel__close_fd(evsel, ncpus, nthreads);
1504 perf_evsel__free_fd(evsel);
48290609
ACM		 1505}
1506
0252208e
ACM		 1507static struct {
1508 struct cpu_map map;
1509 int cpus[1];
1510} empty_cpu_map = {
1511 .map.nr = 1,
1512 .cpus = { -1, },
1513};
1514
1515static struct {
1516 struct thread_map map;
1517 int threads[1];
1518} empty_thread_map = {
1519 .map.nr = 1,
1520 .threads = { -1, },
1521};
1522
f08199d3 1523int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
6a4bb04c 1524 struct thread_map *threads)
48290609 1525{
0252208e
ACM		 1526 if (cpus == NULL) {
1527 /* Work around old compiler warnings about strict aliasing */
1528 cpus = &empty_cpu_map.map;
48290609
ACM		 1529 }
1530
0252208e
ACM		 1531 if (threads == NULL)
1532 threads = &empty_thread_map.map;
48290609 1533
6a4bb04c 1534 return __perf_evsel__open(evsel, cpus, threads);
48290609
ACM		 1535}
1536
f08199d3 1537int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
6a4bb04c 1538 struct cpu_map *cpus)
48290609 1539{
6a4bb04c 1540 return __perf_evsel__open(evsel, cpus, &empty_thread_map.map);
0252208e 1541}
48290609 1542
f08199d3 1543int perf_evsel__open_per_thread(struct perf_evsel *evsel,
6a4bb04c 1544 struct thread_map *threads)
0252208e 1545{
6a4bb04c 1546 return __perf_evsel__open(evsel, &empty_cpu_map.map, threads);
48290609 1547}
70082dd9 1548
0807d2d8
ACM		 1549static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
1550 const union perf_event *event,
1551 struct perf_sample *sample)
d0dd74e8 1552{
0807d2d8 1553 u64 type = evsel->attr.sample_type;
d0dd74e8 1554 const u64 *array = event->sample.array;
0807d2d8 1555 bool swapped = evsel->needs_swap;
37073f9e 1556 union u64_swap u;
d0dd74e8
ACM		 1557
1558 array += ((event->header.size -
1559 sizeof(event->header)) / sizeof(u64)) - 1;
1560
75562573
AH		 1561 if (type & PERF_SAMPLE_IDENTIFIER) {
1562 sample->id = *array;
1563 array--;
1564 }
1565
d0dd74e8 1566 if (type & PERF_SAMPLE_CPU) {
37073f9e
JO		 1567 u.val64 = *array;
1568 if (swapped) {
1569 /* undo swap of u64, then swap on individual u32s */
1570 u.val64 = bswap_64(u.val64);
1571 u.val32[0] = bswap_32(u.val32[0]);
1572 }
1573
1574 sample->cpu = u.val32[0];
d0dd74e8
ACM		 1575 array--;
1576 }
1577
1578 if (type & PERF_SAMPLE_STREAM_ID) {
1579 sample->stream_id = *array;
1580 array--;
1581 }
1582
1583 if (type & PERF_SAMPLE_ID) {
1584 sample->id = *array;
1585 array--;
1586 }
1587
1588 if (type & PERF_SAMPLE_TIME) {
1589 sample->time = *array;
1590 array--;
1591 }
1592
1593 if (type & PERF_SAMPLE_TID) {
37073f9e
JO		 1594 u.val64 = *array;
1595 if (swapped) {
1596 /* undo swap of u64, then swap on individual u32s */
1597 u.val64 = bswap_64(u.val64);
1598 u.val32[0] = bswap_32(u.val32[0]);
1599 u.val32[1] = bswap_32(u.val32[1]);
1600 }
1601
1602 sample->pid = u.val32[0];
1603 sample->tid = u.val32[1];
dd44bc6b 1604 array--;
d0dd74e8
ACM		 1605 }
1606
1607 return 0;
1608}
1609
03b6ea9b
AH		 1610static inline bool overflow(const void *endp, u16 max_size, const void *offset,
1611 u64 size)
98e1da90 1612{
03b6ea9b
AH		 1613 return size > max_size || offset + size > endp;
1614}
98e1da90 1615
03b6ea9b
AH		 1616#define OVERFLOW_CHECK(offset, size, max_size) \
1617 do { \
1618 if (overflow(endp, (max_size), (offset), (size))) \
1619 return -EFAULT; \
1620 } while (0)
98e1da90 1621
03b6ea9b
AH		 1622#define OVERFLOW_CHECK_u64(offset) \
1623 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
98e1da90 1624
a3f698fe 1625int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
0807d2d8 1626 struct perf_sample *data)
d0dd74e8 1627{
a3f698fe 1628 u64 type = evsel->attr.sample_type;
0807d2d8 1629 bool swapped = evsel->needs_swap;
d0dd74e8 1630 const u64 *array;
03b6ea9b
AH		 1631 u16 max_size = event->header.size;
1632 const void *endp = (void *)event + max_size;
1633 u64 sz;
d0dd74e8 1634
936be503
DA		 1635 /*
1636 * used for cross-endian analysis. See git commit 65014ab3
1637 * for why this goofiness is needed.
1638 */
6a11f92e 1639 union u64_swap u;
936be503 1640
f3bda2c9 1641 memset(data, 0, sizeof(*data));
d0dd74e8
ACM		 1642 data->cpu = data->pid = data->tid = -1;
1643 data->stream_id = data->id = data->time = -1ULL;
bc529086 1644 data->period = evsel->attr.sample_period;
05484298 1645 data->weight = 0;
473398a2 1646 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
d0dd74e8
ACM		 1647
1648 if (event->header.type != PERF_RECORD_SAMPLE) {
a3f698fe 1649 if (!evsel->attr.sample_id_all)
d0dd74e8 1650 return 0;
0807d2d8 1651 return perf_evsel__parse_id_sample(evsel, event, data);
d0dd74e8
ACM		 1652 }
1653
1654 array = event->sample.array;
1655
03b6ea9b
AH		 1656 /*
1657 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
1658 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
1659 * check the format does not go past the end of the event.
1660 */
a3f698fe 1661 if (evsel->sample_size + sizeof(event->header) > event->header.size)
a2854124
FW		 1662 return -EFAULT;
1663
75562573
AH		 1664 data->id = -1ULL;
1665 if (type & PERF_SAMPLE_IDENTIFIER) {
1666 data->id = *array;
1667 array++;
1668 }
1669
d0dd74e8 1670 if (type & PERF_SAMPLE_IP) {
ef89325f 1671 data->ip = *array;
d0dd74e8
ACM		 1672 array++;
1673 }
1674
1675 if (type & PERF_SAMPLE_TID) {
936be503
DA		 1676 u.val64 = *array;
1677 if (swapped) {
1678 /* undo swap of u64, then swap on individual u32s */
1679 u.val64 = bswap_64(u.val64);
1680 u.val32[0] = bswap_32(u.val32[0]);
1681 u.val32[1] = bswap_32(u.val32[1]);
1682 }
1683
1684 data->pid = u.val32[0];
1685 data->tid = u.val32[1];
d0dd74e8
ACM		 1686 array++;
1687 }
1688
1689 if (type & PERF_SAMPLE_TIME) {
1690 data->time = *array;
1691 array++;
1692 }
1693
7cec0922 1694 data->addr = 0;
d0dd74e8
ACM		 1695 if (type & PERF_SAMPLE_ADDR) {
1696 data->addr = *array;
1697 array++;
1698 }
1699
d0dd74e8
ACM		 1700 if (type & PERF_SAMPLE_ID) {
1701 data->id = *array;
1702 array++;
1703 }
1704
1705 if (type & PERF_SAMPLE_STREAM_ID) {
1706 data->stream_id = *array;
1707 array++;
1708 }
1709
1710 if (type & PERF_SAMPLE_CPU) {
936be503
DA		 1711
1712 u.val64 = *array;
1713 if (swapped) {
1714 /* undo swap of u64, then swap on individual u32s */
1715 u.val64 = bswap_64(u.val64);
1716 u.val32[0] = bswap_32(u.val32[0]);
1717 }
1718
1719 data->cpu = u.val32[0];
d0dd74e8
ACM		 1720 array++;
1721 }
1722
1723 if (type & PERF_SAMPLE_PERIOD) {
1724 data->period = *array;
1725 array++;
1726 }
1727
1728 if (type & PERF_SAMPLE_READ) {
9ede473c
JO		 1729 u64 read_format = evsel->attr.read_format;
1730
03b6ea9b 1731 OVERFLOW_CHECK_u64(array);
9ede473c
JO		 1732 if (read_format & PERF_FORMAT_GROUP)
1733 data->read.group.nr = *array;
1734 else
1735 data->read.one.value = *array;
1736
1737 array++;
1738
1739 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
03b6ea9b 1740 OVERFLOW_CHECK_u64(array);
9ede473c
JO		 1741 data->read.time_enabled = *array;
1742 array++;
1743 }
1744
1745 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
03b6ea9b 1746 OVERFLOW_CHECK_u64(array);
9ede473c
JO		 1747 data->read.time_running = *array;
1748 array++;
1749 }
1750
1751 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1752 if (read_format & PERF_FORMAT_GROUP) {
03b6ea9b
AH		 1753 const u64 max_group_nr = UINT64_MAX /
1754 sizeof(struct sample_read_value);
1755
1756 if (data->read.group.nr > max_group_nr)
1757 return -EFAULT;
1758 sz = data->read.group.nr *
1759 sizeof(struct sample_read_value);
1760 OVERFLOW_CHECK(array, sz, max_size);
1761 data->read.group.values =
1762 (struct sample_read_value *)array;
1763 array = (void *)array + sz;
9ede473c 1764 } else {
03b6ea9b 1765 OVERFLOW_CHECK_u64(array);
9ede473c
JO		 1766 data->read.one.id = *array;
1767 array++;
1768 }
d0dd74e8
ACM		 1769 }
1770
1771 if (type & PERF_SAMPLE_CALLCHAIN) {
03b6ea9b 1772 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
98e1da90 1773
03b6ea9b
AH		 1774 OVERFLOW_CHECK_u64(array);
1775 data->callchain = (struct ip_callchain *)array++;
1776 if (data->callchain->nr > max_callchain_nr)
98e1da90 1777 return -EFAULT;
03b6ea9b
AH		 1778 sz = data->callchain->nr * sizeof(u64);
1779 OVERFLOW_CHECK(array, sz, max_size);
1780 array = (void *)array + sz;
d0dd74e8
ACM		 1781 }
1782
1783 if (type & PERF_SAMPLE_RAW) {
03b6ea9b 1784 OVERFLOW_CHECK_u64(array);
936be503
DA		 1785 u.val64 = *array;
1786 if (WARN_ONCE(swapped,
1787 "Endianness of raw data not corrected!\n")) {
1788 /* undo swap of u64, then swap on individual u32s */
1789 u.val64 = bswap_64(u.val64);
1790 u.val32[0] = bswap_32(u.val32[0]);
1791 u.val32[1] = bswap_32(u.val32[1]);
1792 }
936be503 1793 data->raw_size = u.val32[0];
03b6ea9b 1794 array = (void *)array + sizeof(u32);
98e1da90 1795
03b6ea9b
AH		 1796 OVERFLOW_CHECK(array, data->raw_size, max_size);
1797 data->raw_data = (void *)array;
1798 array = (void *)array + data->raw_size;
d0dd74e8
ACM		 1799 }
1800
b5387528 1801 if (type & PERF_SAMPLE_BRANCH_STACK) {
03b6ea9b
AH		 1802 const u64 max_branch_nr = UINT64_MAX /
1803 sizeof(struct branch_entry);
b5387528 1804
03b6ea9b
AH		 1805 OVERFLOW_CHECK_u64(array);
1806 data->branch_stack = (struct branch_stack *)array++;
b5387528 1807
03b6ea9b
AH		 1808 if (data->branch_stack->nr > max_branch_nr)
1809 return -EFAULT;
b5387528 1810 sz = data->branch_stack->nr * sizeof(struct branch_entry);
03b6ea9b
AH		 1811 OVERFLOW_CHECK(array, sz, max_size);
1812 array = (void *)array + sz;
b5387528 1813 }
0f6a3015
JO		 1814
1815 if (type & PERF_SAMPLE_REGS_USER) {
03b6ea9b 1816 OVERFLOW_CHECK_u64(array);
5b95a4a3
AH		 1817 data->user_regs.abi = *array;
1818 array++;
0f6a3015 1819
5b95a4a3 1820 if (data->user_regs.abi) {
352ea45a 1821 u64 mask = evsel->attr.sample_regs_user;
03b6ea9b 1822
352ea45a 1823 sz = hweight_long(mask) * sizeof(u64);
03b6ea9b 1824 OVERFLOW_CHECK(array, sz, max_size);
352ea45a 1825 data->user_regs.mask = mask;
0f6a3015 1826 data->user_regs.regs = (u64 *)array;
03b6ea9b 1827 array = (void *)array + sz;
0f6a3015
JO		 1828 }
1829 }
1830
1831 if (type & PERF_SAMPLE_STACK_USER) {
03b6ea9b
AH		 1832 OVERFLOW_CHECK_u64(array);
1833 sz = *array++;
0f6a3015
JO		 1834
1835 data->user_stack.offset = ((char *)(array - 1)
1836 - (char *) event);
1837
03b6ea9b 1838 if (!sz) {
0f6a3015
JO		 1839 data->user_stack.size = 0;
1840 } else {
03b6ea9b 1841 OVERFLOW_CHECK(array, sz, max_size);
0f6a3015 1842 data->user_stack.data = (char *)array;
03b6ea9b
AH		 1843 array = (void *)array + sz;
1844 OVERFLOW_CHECK_u64(array);
54bd2692 1845 data->user_stack.size = *array++;
a65cb4b9
JO		 1846 if (WARN_ONCE(data->user_stack.size > sz,
1847 "user stack dump failure\n"))
1848 return -EFAULT;
0f6a3015
JO		 1849 }
1850 }
1851
05484298
AK		 1852 data->weight = 0;
1853 if (type & PERF_SAMPLE_WEIGHT) {
03b6ea9b 1854 OVERFLOW_CHECK_u64(array);
05484298
AK		 1855 data->weight = *array;
1856 array++;
1857 }
1858
98a3b32c
SE		 1859 data->data_src = PERF_MEM_DATA_SRC_NONE;
1860 if (type & PERF_SAMPLE_DATA_SRC) {
03b6ea9b 1861 OVERFLOW_CHECK_u64(array);
98a3b32c
SE		 1862 data->data_src = *array;
1863 array++;
1864 }
1865
475eeab9
AK		 1866 data->transaction = 0;
1867 if (type & PERF_SAMPLE_TRANSACTION) {
87b95524 1868 OVERFLOW_CHECK_u64(array);
475eeab9
AK		 1869 data->transaction = *array;
1870 array++;
1871 }
1872
6a21c0b5
SE		 1873 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
1874 if (type & PERF_SAMPLE_REGS_INTR) {
1875 OVERFLOW_CHECK_u64(array);
1876 data->intr_regs.abi = *array;
1877 array++;
1878
1879 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
1880 u64 mask = evsel->attr.sample_regs_intr;
1881
1882 sz = hweight_long(mask) * sizeof(u64);
1883 OVERFLOW_CHECK(array, sz, max_size);
1884 data->intr_regs.mask = mask;
1885 data->intr_regs.regs = (u64 *)array;
1886 array = (void *)array + sz;
1887 }
1888 }
1889
d0dd74e8
ACM		 1890 return 0;
1891}
74eec26f 1892
b1cf6f65 1893size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
352ea45a 1894 u64 read_format)
b1cf6f65
AH		 1895{
1896 size_t sz, result = sizeof(struct sample_event);
1897
1898 if (type & PERF_SAMPLE_IDENTIFIER)
1899 result += sizeof(u64);
1900
1901 if (type & PERF_SAMPLE_IP)
1902 result += sizeof(u64);
1903
1904 if (type & PERF_SAMPLE_TID)
1905 result += sizeof(u64);
1906
1907 if (type & PERF_SAMPLE_TIME)
1908 result += sizeof(u64);
1909
1910 if (type & PERF_SAMPLE_ADDR)
1911 result += sizeof(u64);
1912
1913 if (type & PERF_SAMPLE_ID)
1914 result += sizeof(u64);
1915
1916 if (type & PERF_SAMPLE_STREAM_ID)
1917 result += sizeof(u64);
1918
1919 if (type & PERF_SAMPLE_CPU)
1920 result += sizeof(u64);
1921
1922 if (type & PERF_SAMPLE_PERIOD)
1923 result += sizeof(u64);
1924
1925 if (type & PERF_SAMPLE_READ) {
1926 result += sizeof(u64);
1927 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1928 result += sizeof(u64);
1929 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1930 result += sizeof(u64);
1931 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
1932 if (read_format & PERF_FORMAT_GROUP) {
1933 sz = sample->read.group.nr *
1934 sizeof(struct sample_read_value);
1935 result += sz;
1936 } else {
1937 result += sizeof(u64);
1938 }
1939 }
1940
1941 if (type & PERF_SAMPLE_CALLCHAIN) {
1942 sz = (sample->callchain->nr + 1) * sizeof(u64);
1943 result += sz;
1944 }
1945
1946 if (type & PERF_SAMPLE_RAW) {
1947 result += sizeof(u32);
1948 result += sample->raw_size;
1949 }
1950
1951 if (type & PERF_SAMPLE_BRANCH_STACK) {
1952 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
1953 sz += sizeof(u64);
1954 result += sz;
1955 }
1956
1957 if (type & PERF_SAMPLE_REGS_USER) {
1958 if (sample->user_regs.abi) {
1959 result += sizeof(u64);
352ea45a 1960 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
b1cf6f65
AH		 1961 result += sz;
1962 } else {
1963 result += sizeof(u64);
1964 }
1965 }
1966
1967 if (type & PERF_SAMPLE_STACK_USER) {
1968 sz = sample->user_stack.size;
1969 result += sizeof(u64);
1970 if (sz) {
1971 result += sz;
1972 result += sizeof(u64);
1973 }
1974 }
1975
1976 if (type & PERF_SAMPLE_WEIGHT)
1977 result += sizeof(u64);
1978
1979 if (type & PERF_SAMPLE_DATA_SRC)
1980 result += sizeof(u64);
1981
42d88910
AH		 1982 if (type & PERF_SAMPLE_TRANSACTION)
1983 result += sizeof(u64);
1984
6a21c0b5
SE		 1985 if (type & PERF_SAMPLE_REGS_INTR) {
1986 if (sample->intr_regs.abi) {
1987 result += sizeof(u64);
1988 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
1989 result += sz;
1990 } else {
1991 result += sizeof(u64);
1992 }
1993 }
1994
b1cf6f65
AH		 1995 return result;
1996}
1997
74eec26f 1998int perf_event__synthesize_sample(union perf_event *event, u64 type,
352ea45a 1999 u64 read_format,
74eec26f
AV		 2000 const struct perf_sample *sample,
2001 bool swapped)
2002{
2003 u64 *array;
d03f2170 2004 size_t sz;
74eec26f
AV		 2005 /*
2006 * used for cross-endian analysis. See git commit 65014ab3
2007 * for why this goofiness is needed.
2008 */
6a11f92e 2009 union u64_swap u;
74eec26f
AV		 2010
2011 array = event->sample.array;
2012
75562573
AH		 2013 if (type & PERF_SAMPLE_IDENTIFIER) {
2014 *array = sample->id;
2015 array++;
2016 }
2017
74eec26f 2018 if (type & PERF_SAMPLE_IP) {
ef89325f 2019 *array = sample->ip;
74eec26f
AV		 2020 array++;
2021 }
2022
2023 if (type & PERF_SAMPLE_TID) {
2024 u.val32[0] = sample->pid;
2025 u.val32[1] = sample->tid;
2026 if (swapped) {
2027 /*
a3f698fe 2028 * Inverse of what is done in perf_evsel__parse_sample
74eec26f
AV		 2029 */
2030 u.val32[0] = bswap_32(u.val32[0]);
2031 u.val32[1] = bswap_32(u.val32[1]);
2032 u.val64 = bswap_64(u.val64);
2033 }
2034
2035 *array = u.val64;
2036 array++;
2037 }
2038
2039 if (type & PERF_SAMPLE_TIME) {
2040 *array = sample->time;
2041 array++;
2042 }
2043
2044 if (type & PERF_SAMPLE_ADDR) {
2045 *array = sample->addr;
2046 array++;
2047 }
2048
2049 if (type & PERF_SAMPLE_ID) {
2050 *array = sample->id;
2051 array++;
2052 }
2053
2054 if (type & PERF_SAMPLE_STREAM_ID) {
2055 *array = sample->stream_id;
2056 array++;
2057 }
2058
2059 if (type & PERF_SAMPLE_CPU) {
2060 u.val32[0] = sample->cpu;
2061 if (swapped) {
2062 /*
a3f698fe 2063 * Inverse of what is done in perf_evsel__parse_sample
74eec26f
AV		 2064 */
2065 u.val32[0] = bswap_32(u.val32[0]);
2066 u.val64 = bswap_64(u.val64);
2067 }
2068 *array = u.val64;
2069 array++;
2070 }
2071
2072 if (type & PERF_SAMPLE_PERIOD) {
2073 *array = sample->period;
2074 array++;
2075 }
2076
d03f2170
AH		 2077 if (type & PERF_SAMPLE_READ) {
2078 if (read_format & PERF_FORMAT_GROUP)
2079 *array = sample->read.group.nr;
2080 else
2081 *array = sample->read.one.value;
2082 array++;
2083
2084 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2085 *array = sample->read.time_enabled;
2086 array++;
2087 }
2088
2089 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2090 *array = sample->read.time_running;
2091 array++;
2092 }
2093
2094 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2095 if (read_format & PERF_FORMAT_GROUP) {
2096 sz = sample->read.group.nr *
2097 sizeof(struct sample_read_value);
2098 memcpy(array, sample->read.group.values, sz);
2099 array = (void *)array + sz;
2100 } else {
2101 *array = sample->read.one.id;
2102 array++;
2103 }
2104 }
2105
2106 if (type & PERF_SAMPLE_CALLCHAIN) {
2107 sz = (sample->callchain->nr + 1) * sizeof(u64);
2108 memcpy(array, sample->callchain, sz);
2109 array = (void *)array + sz;
2110 }
2111
2112 if (type & PERF_SAMPLE_RAW) {
2113 u.val32[0] = sample->raw_size;
2114 if (WARN_ONCE(swapped,
2115 "Endianness of raw data not corrected!\n")) {
2116 /*
2117 * Inverse of what is done in perf_evsel__parse_sample
2118 */
2119 u.val32[0] = bswap_32(u.val32[0]);
2120 u.val32[1] = bswap_32(u.val32[1]);
2121 u.val64 = bswap_64(u.val64);
2122 }
2123 *array = u.val64;
2124 array = (void *)array + sizeof(u32);
2125
2126 memcpy(array, sample->raw_data, sample->raw_size);
2127 array = (void *)array + sample->raw_size;
2128 }
2129
2130 if (type & PERF_SAMPLE_BRANCH_STACK) {
2131 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2132 sz += sizeof(u64);
2133 memcpy(array, sample->branch_stack, sz);
2134 array = (void *)array + sz;
2135 }
2136
2137 if (type & PERF_SAMPLE_REGS_USER) {
2138 if (sample->user_regs.abi) {
2139 *array++ = sample->user_regs.abi;
352ea45a 2140 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
d03f2170
AH		 2141 memcpy(array, sample->user_regs.regs, sz);
2142 array = (void *)array + sz;
2143 } else {
2144 *array++ = 0;
2145 }
2146 }
2147
2148 if (type & PERF_SAMPLE_STACK_USER) {
2149 sz = sample->user_stack.size;
2150 *array++ = sz;
2151 if (sz) {
2152 memcpy(array, sample->user_stack.data, sz);
2153 array = (void *)array + sz;
2154 *array++ = sz;
2155 }
2156 }
2157
2158 if (type & PERF_SAMPLE_WEIGHT) {
2159 *array = sample->weight;
2160 array++;
2161 }
2162
2163 if (type & PERF_SAMPLE_DATA_SRC) {
2164 *array = sample->data_src;
2165 array++;
2166 }
2167
42d88910
AH		 2168 if (type & PERF_SAMPLE_TRANSACTION) {
2169 *array = sample->transaction;
2170 array++;
2171 }
2172
6a21c0b5
SE		 2173 if (type & PERF_SAMPLE_REGS_INTR) {
2174 if (sample->intr_regs.abi) {
2175 *array++ = sample->intr_regs.abi;
2176 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
2177 memcpy(array, sample->intr_regs.regs, sz);
2178 array = (void *)array + sz;
2179 } else {
2180 *array++ = 0;
2181 }
2182 }
2183
74eec26f
AV		 2184 return 0;
2185}
5555ded4 2186
efd2b924
ACM		 2187struct format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
2188{
2189 return pevent_find_field(evsel->tp_format, name);
2190}
2191
5d2074ea 2192void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
5555ded4
ACM		 2193 const char *name)
2194{
efd2b924 2195 struct format_field *field = perf_evsel__field(evsel, name);
5555ded4
ACM		 2196 int offset;
2197
efd2b924
ACM		 2198 if (!field)
2199 return NULL;
5555ded4
ACM		 2200
2201 offset = field->offset;
2202
2203 if (field->flags & FIELD_IS_DYNAMIC) {
2204 offset = *(int *)(sample->raw_data + field->offset);
2205 offset &= 0xffff;
2206 }
2207
2208 return sample->raw_data + offset;
2209}
2210
2211u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
2212 const char *name)
2213{
efd2b924 2214 struct format_field *field = perf_evsel__field(evsel, name);
e6b6f679
ACM		 2215 void *ptr;
2216 u64 value;
5555ded4 2217
efd2b924
ACM		 2218 if (!field)
2219 return 0;
5555ded4 2220
e6b6f679 2221 ptr = sample->raw_data + field->offset;
5555ded4 2222
e6b6f679
ACM		 2223 switch (field->size) {
2224 case 1:
2225 return *(u8 *)ptr;
2226 case 2:
2227 value = *(u16 *)ptr;
2228 break;
2229 case 4:
2230 value = *(u32 *)ptr;
2231 break;
2232 case 8:
e94eedab 2233 memcpy(&value, ptr, sizeof(u64));
e6b6f679
ACM		 2234 break;
2235 default:
2236 return 0;
2237 }
2238
2239 if (!evsel->needs_swap)
2240 return value;
2241
2242 switch (field->size) {
2243 case 2:
2244 return bswap_16(value);
2245 case 4:
2246 return bswap_32(value);
2247 case 8:
2248 return bswap_64(value);
2249 default:
2250 return 0;
2251 }
2252
2253 return 0;
5555ded4 2254}
0698aedd
ACM		 2255
2256static int comma_fprintf(FILE *fp, bool *first, const char *fmt, ...)
2257{
2258 va_list args;
2259 int ret = 0;
2260
2261 if (!*first) {
2262 ret += fprintf(fp, ",");
2263 } else {
2264 ret += fprintf(fp, ":");
2265 *first = false;
2266 }
2267
2268 va_start(args, fmt);
2269 ret += vfprintf(fp, fmt, args);
2270 va_end(args);
2271 return ret;
2272}
2273
2c5e8c52 2274static int __print_attr__fprintf(FILE *fp, const char *name, const char *val, void *priv)
c79a4393 2275{
2c5e8c52 2276 return comma_fprintf(fp, (bool *)priv, " %s: %s", name, val);
c79a4393
ACM		 2277}
2278
0698aedd
ACM		 2279int perf_evsel__fprintf(struct perf_evsel *evsel,
2280 struct perf_attr_details *details, FILE *fp)
2281{
2282 bool first = true;
e6ab07d0
NK		 2283 int printed = 0;
2284
e35ef355 2285 if (details->event_group) {
e6ab07d0
NK		 2286 struct perf_evsel *pos;
2287
2288 if (!perf_evsel__is_group_leader(evsel))
2289 return 0;
2290
2291 if (evsel->nr_members > 1)
2292 printed += fprintf(fp, "%s{", evsel->group_name ?: "");
2293
2294 printed += fprintf(fp, "%s", perf_evsel__name(evsel));
2295 for_each_group_member(pos, evsel)
2296 printed += fprintf(fp, ",%s", perf_evsel__name(pos));
2297
2298 if (evsel->nr_members > 1)
2299 printed += fprintf(fp, "}");
2300 goto out;
2301 }
2302
2303 printed += fprintf(fp, "%s", perf_evsel__name(evsel));
0698aedd 2304
2c5e8c52
PZ		 2305 if (details->verbose) {
2306 printed += perf_event_attr__fprintf(fp, &evsel->attr,
2307 __print_attr__fprintf, &first);
2308 } else if (details->freq) {
4605bb55
NK		 2309 const char *term = "sample_freq";
2310
2311 if (!evsel->attr.freq)
2312 term = "sample_period";
2313
2314 printed += comma_fprintf(fp, &first, " %s=%" PRIu64,
2315 term, (u64)evsel->attr.sample_freq);
0698aedd 2316 }
775d8a1b
NK		 2317
2318 if (details->trace_fields) {
2319 struct format_field *field;
2320
2321 if (evsel->attr.type != PERF_TYPE_TRACEPOINT) {
2322 printed += comma_fprintf(fp, &first, " (not a tracepoint)");
2323 goto out;
2324 }
2325
2326 field = evsel->tp_format->format.fields;
2327 if (field == NULL) {
2328 printed += comma_fprintf(fp, &first, " (no trace field)");
2329 goto out;
2330 }
2331
2332 printed += comma_fprintf(fp, &first, " trace_fields: %s", field->name);
2333
2334 field = field->next;
2335 while (field) {
2336 printed += comma_fprintf(fp, &first, "%s", field->name);
2337 field = field->next;
2338 }
2339 }
e6ab07d0 2340out:
0698aedd
ACM		 2341 fputc('\n', fp);
2342 return ++printed;
2343}
c0a54341
ACM		 2344
2345bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
2346 char *msg, size_t msgsize)
2347{
2b821cce 2348 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
c0a54341
ACM		 2349 evsel->attr.type == PERF_TYPE_HARDWARE &&
2350 evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2351 /*
2352 * If it's cycles then fall back to hrtimer based
2353 * cpu-clock-tick sw counter, which is always available even if
2354 * no PMU support.
2355 *
2356 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2357 * b0a873e).
2358 */
2359 scnprintf(msg, msgsize, "%s",
2360"The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2361
2362 evsel->attr.type = PERF_TYPE_SOFTWARE;
2363 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
2364
04662523 2365 zfree(&evsel->name);
c0a54341
ACM		 2366 return true;
2367 }
2368
2369 return false;
2370}
56e52e85 2371
602ad878 2372int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
56e52e85
ACM		 2373 int err, char *msg, size_t size)
2374{
6e81c74c
MH		 2375 char sbuf[STRERR_BUFSIZE];
2376
56e52e85
ACM		 2377 switch (err) {
2378 case EPERM:
2379 case EACCES:
b69e63a4 2380 return scnprintf(msg, size,
3379e0c3
BH		 2381 "You may not have permission to collect %sstats.\n\n"
2382 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
2383 "which controls use of the performance events system by\n"
2384 "unprivileged users (without CAP_SYS_ADMIN).\n\n"
2385 "The default value is 1:\n\n"
2386 " -1: Allow use of (almost) all events by all users\n"
2387 ">= 0: Disallow raw tracepoint access by users without CAP_IOC_LOCK\n"
2388 ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
2389 ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN",
56e52e85
ACM		 2390 target->system_wide ? "system-wide " : "");
2391 case ENOENT:
2392 return scnprintf(msg, size, "The %s event is not supported.",
2393 perf_evsel__name(evsel));
2394 case EMFILE:
2395 return scnprintf(msg, size, "%s",
2396 "Too many events are opened.\n"
18ffdfe8
JO		 2397 "Probably the maximum number of open file descriptors has been reached.\n"
2398 "Hint: Try again after reducing the number of events.\n"
2399 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
56e52e85
ACM		 2400 case ENODEV:
2401 if (target->cpu_list)
2402 return scnprintf(msg, size, "%s",
2403 "No such device - did you specify an out-of-range profile CPU?\n");
2404 break;
2405 case EOPNOTSUPP:
2406 if (evsel->attr.precise_ip)
2407 return scnprintf(msg, size, "%s",
2408 "\'precise\' request may not be supported. Try removing 'p' modifier.");
2409#if defined(__i386__) || defined(__x86_64__)
2410 if (evsel->attr.type == PERF_TYPE_HARDWARE)
2411 return scnprintf(msg, size, "%s",
2412 "No hardware sampling interrupt available.\n"
2413 "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.");
2414#endif
2415 break;
63914aca
JO		 2416 case EBUSY:
2417 if (find_process("oprofiled"))
2418 return scnprintf(msg, size,
2419 "The PMU counters are busy/taken by another profiler.\n"
2420 "We found oprofile daemon running, please stop it and try again.");
2421 break;
814c8c38
PZ		 2422 case EINVAL:
2423 if (perf_missing_features.clockid)
2424 return scnprintf(msg, size, "clockid feature not supported.");
2425 if (perf_missing_features.clockid_wrong)
2426 return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2427 break;
56e52e85
ACM		 2428 default:
2429 break;
2430 }
2431
2432 return scnprintf(msg, size,
6e81c74c 2433 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
56e52e85
ACM		 2434 "/bin/dmesg may provide additional information.\n"
2435 "No CONFIG_PERF_EVENTS=y kernel support configured?\n",
6e81c74c
MH		 2436 err, strerror_r(err, sbuf, sizeof(sbuf)),
2437 perf_evsel__name(evsel));
56e52e85 2438}
Linux kernel - Deliverables
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