?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Revert "perf augmented_syscalls: Drop 'write', 'poll' for testing without self pid...
[linux/fpc-iii.git] / tools / perf / util / evsel.c
blobdbc0466db3680580da689662a7c9b4bae891cf46
1 /*
2 * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
3 *
4 * Parts came from builtin-{top,stat,record}.c, see those files for further
5 * copyright notes.
6 *
7 * Released under the GPL v2. (and only v2, not any later version)
8 */
9
10 #include <byteswap.h>
11 #include <errno.h>
12 #include <inttypes.h>
13 #include <linux/bitops.h>
14 #include <api/fs/fs.h>
15 #include <api/fs/tracing_path.h>
16 #include <traceevent/event-parse.h>
17 #include <linux/hw_breakpoint.h>
18 #include <linux/perf_event.h>
19 #include <linux/compiler.h>
20 #include <linux/err.h>
21 #include <sys/ioctl.h>
22 #include <sys/resource.h>
23 #include <sys/types.h>
24 #include <dirent.h>
25 #include "asm/bug.h"
26 #include "callchain.h"
27 #include "cgroup.h"
28 #include "event.h"
29 #include "evsel.h"
30 #include "evlist.h"
31 #include "util.h"
32 #include "cpumap.h"
33 #include "thread_map.h"
34 #include "target.h"
35 #include "perf_regs.h"
36 #include "debug.h"
37 #include "trace-event.h"
38 #include "stat.h"
39 #include "memswap.h"
40 #include "util/parse-branch-options.h"
41
42 #include "sane_ctype.h"
43
44 struct perf_missing_features perf_missing_features;
45
46 static clockid_t clockid;
47
48 static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused)
49 {
50 return 0;
51 }
52
53 void __weak test_attr__ready(void) { }
54
55 static void perf_evsel__no_extra_fini(struct perf_evsel *evsel __maybe_unused)
56 {
57 }
58
59 static struct {
60 size_t size;
61 int (*init)(struct perf_evsel *evsel);
62 void (*fini)(struct perf_evsel *evsel);
63 } perf_evsel__object = {
64 .size = sizeof(struct perf_evsel),
65 .init = perf_evsel__no_extra_init,
66 .fini = perf_evsel__no_extra_fini,
67 };
68
69 int perf_evsel__object_config(size_t object_size,
70 int (*init)(struct perf_evsel *evsel),
71 void (*fini)(struct perf_evsel *evsel))
72 {
73
74 if (object_size == 0)
75 goto set_methods;
76
77 if (perf_evsel__object.size > object_size)
78 return -EINVAL;
79
80 perf_evsel__object.size = object_size;
81
82 set_methods:
83 if (init != NULL)
84 perf_evsel__object.init = init;
85
86 if (fini != NULL)
87 perf_evsel__object.fini = fini;
88
89 return 0;
90 }
91
92 #define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
93
94 int __perf_evsel__sample_size(u64 sample_type)
95 {
96 u64 mask = sample_type & PERF_SAMPLE_MASK;
97 int size = 0;
98 int i;
99
100 for (i = 0; i < 64; i++) {
101 if (mask & (1ULL << i))
102 size++;
103 }
104
105 size *= sizeof(u64);
106
107 return size;
108 }
109
110 /**
111 * __perf_evsel__calc_id_pos - calculate id_pos.
112 * @sample_type: sample type
113 *
114 * This function returns the position of the event id (PERF_SAMPLE_ID or
115 * PERF_SAMPLE_IDENTIFIER) in a sample event i.e. in the array of struct
116 * sample_event.
117 */
118 static int __perf_evsel__calc_id_pos(u64 sample_type)
119 {
120 int idx = 0;
121
122 if (sample_type & PERF_SAMPLE_IDENTIFIER)
123 return 0;
124
125 if (!(sample_type & PERF_SAMPLE_ID))
126 return -1;
127
128 if (sample_type & PERF_SAMPLE_IP)
129 idx += 1;
130
131 if (sample_type & PERF_SAMPLE_TID)
132 idx += 1;
133
134 if (sample_type & PERF_SAMPLE_TIME)
135 idx += 1;
136
137 if (sample_type & PERF_SAMPLE_ADDR)
138 idx += 1;
139
140 return idx;
141 }
142
143 /**
144 * __perf_evsel__calc_is_pos - calculate is_pos.
145 * @sample_type: sample type
146 *
147 * This function returns the position (counting backwards) of the event id
148 * (PERF_SAMPLE_ID or PERF_SAMPLE_IDENTIFIER) in a non-sample event i.e. if
149 * sample_id_all is used there is an id sample appended to non-sample events.
150 */
151 static int __perf_evsel__calc_is_pos(u64 sample_type)
152 {
153 int idx = 1;
154
155 if (sample_type & PERF_SAMPLE_IDENTIFIER)
156 return 1;
157
158 if (!(sample_type & PERF_SAMPLE_ID))
159 return -1;
160
161 if (sample_type & PERF_SAMPLE_CPU)
162 idx += 1;
163
164 if (sample_type & PERF_SAMPLE_STREAM_ID)
165 idx += 1;
166
167 return idx;
168 }
169
170 void perf_evsel__calc_id_pos(struct perf_evsel *evsel)
171 {
172 evsel->id_pos = __perf_evsel__calc_id_pos(evsel->attr.sample_type);
173 evsel->is_pos = __perf_evsel__calc_is_pos(evsel->attr.sample_type);
174 }
175
176 void __perf_evsel__set_sample_bit(struct perf_evsel *evsel,
177 enum perf_event_sample_format bit)
178 {
179 if (!(evsel->attr.sample_type & bit)) {
180 evsel->attr.sample_type |= bit;
181 evsel->sample_size += sizeof(u64);
182 perf_evsel__calc_id_pos(evsel);
183 }
184 }
185
186 void __perf_evsel__reset_sample_bit(struct perf_evsel *evsel,
187 enum perf_event_sample_format bit)
188 {
189 if (evsel->attr.sample_type & bit) {
190 evsel->attr.sample_type &= ~bit;
191 evsel->sample_size -= sizeof(u64);
192 perf_evsel__calc_id_pos(evsel);
193 }
194 }
195
196 void perf_evsel__set_sample_id(struct perf_evsel *evsel,
197 bool can_sample_identifier)
198 {
199 if (can_sample_identifier) {
200 perf_evsel__reset_sample_bit(evsel, ID);
201 perf_evsel__set_sample_bit(evsel, IDENTIFIER);
202 } else {
203 perf_evsel__set_sample_bit(evsel, ID);
204 }
205 evsel->attr.read_format |= PERF_FORMAT_ID;
206 }
207
208 /**
209 * perf_evsel__is_function_event - Return whether given evsel is a function
210 * trace event
211 *
212 * @evsel - evsel selector to be tested
213 *
214 * Return %true if event is function trace event
215 */
216 bool perf_evsel__is_function_event(struct perf_evsel *evsel)
217 {
218 #define FUNCTION_EVENT "ftrace:function"
219
220 return evsel->name &&
221 !strncmp(FUNCTION_EVENT, evsel->name, sizeof(FUNCTION_EVENT));
222
223 #undef FUNCTION_EVENT
224 }
225
226 void perf_evsel__init(struct perf_evsel *evsel,
227 struct perf_event_attr *attr, int idx)
228 {
229 evsel->idx = idx;
230 evsel->tracking = !idx;
231 evsel->attr = *attr;
232 evsel->leader = evsel;
233 evsel->unit = "";
234 evsel->scale = 1.0;
235 evsel->max_events = ULONG_MAX;
236 evsel->evlist = NULL;
237 evsel->bpf_fd = -1;
238 INIT_LIST_HEAD(&evsel->node);
239 INIT_LIST_HEAD(&evsel->config_terms);
240 perf_evsel__object.init(evsel);
241 evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
242 perf_evsel__calc_id_pos(evsel);
243 evsel->cmdline_group_boundary = false;
244 evsel->metric_expr = NULL;
245 evsel->metric_name = NULL;
246 evsel->metric_events = NULL;
247 evsel->collect_stat = false;
248 evsel->pmu_name = NULL;
249 }
250
251 struct perf_evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
252 {
253 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
254
255 if (!evsel)
256 return NULL;
257 perf_evsel__init(evsel, attr, idx);
258
259 if (perf_evsel__is_bpf_output(evsel)) {
260 evsel->attr.sample_type |= (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
261 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
262 evsel->attr.sample_period = 1;
263 }
264
265 if (perf_evsel__is_clock(evsel)) {
266 /*
267 * The evsel->unit points to static alias->unit
268 * so it's ok to use static string in here.
269 */
270 static const char *unit = "msec";
271
272 evsel->unit = unit;
273 evsel->scale = 1e-6;
274 }
275
276 return evsel;
277 }
278
279 static bool perf_event_can_profile_kernel(void)
280 {
281 return geteuid() == 0 || perf_event_paranoid() == -1;
282 }
283
284 struct perf_evsel *perf_evsel__new_cycles(bool precise)
285 {
286 struct perf_event_attr attr = {
287 .type = PERF_TYPE_HARDWARE,
288 .config = PERF_COUNT_HW_CPU_CYCLES,
289 .exclude_kernel = !perf_event_can_profile_kernel(),
290 };
291 struct perf_evsel *evsel;
292
293 event_attr_init(&attr);
294
295 if (!precise)
296 goto new_event;
297 /*
298 * Unnamed union member, not supported as struct member named
299 * initializer in older compilers such as gcc 4.4.7
300 *
301 * Just for probing the precise_ip:
302 */
303 attr.sample_period = 1;
304
305 perf_event_attr__set_max_precise_ip(&attr);
306 /*
307 * Now let the usual logic to set up the perf_event_attr defaults
308 * to kick in when we return and before perf_evsel__open() is called.
309 */
310 attr.sample_period = 0;
311 new_event:
312 evsel = perf_evsel__new(&attr);
313 if (evsel == NULL)
314 goto out;
315
316 /* use asprintf() because free(evsel) assumes name is allocated */
317 if (asprintf(&evsel->name, "cycles%s%s%.*s",
318 (attr.precise_ip || attr.exclude_kernel) ? ":" : "",
319 attr.exclude_kernel ? "u" : "",
320 attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0)
321 goto error_free;
322 out:
323 return evsel;
324 error_free:
325 perf_evsel__delete(evsel);
326 evsel = NULL;
327 goto out;
328 }
329
330 /*
331 * Returns pointer with encoded error via <linux/err.h> interface.
332 */
333 struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
334 {
335 struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
336 int err = -ENOMEM;
337
338 if (evsel == NULL) {
339 goto out_err;
340 } else {
341 struct perf_event_attr attr = {
342 .type = PERF_TYPE_TRACEPOINT,
343 .sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
344 PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
345 };
346
347 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
348 goto out_free;
349
350 evsel->tp_format = trace_event__tp_format(sys, name);
351 if (IS_ERR(evsel->tp_format)) {
352 err = PTR_ERR(evsel->tp_format);
353 goto out_free;
354 }
355
356 event_attr_init(&attr);
357 attr.config = evsel->tp_format->id;
358 attr.sample_period = 1;
359 perf_evsel__init(evsel, &attr, idx);
360 }
361
362 return evsel;
363
364 out_free:
365 zfree(&evsel->name);
366 free(evsel);
367 out_err:
368 return ERR_PTR(err);
369 }
370
371 const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
372 "cycles",
373 "instructions",
374 "cache-references",
375 "cache-misses",
376 "branches",
377 "branch-misses",
378 "bus-cycles",
379 "stalled-cycles-frontend",
380 "stalled-cycles-backend",
381 "ref-cycles",
382 };
383
384 static const char *__perf_evsel__hw_name(u64 config)
385 {
386 if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
387 return perf_evsel__hw_names[config];
388
389 return "unknown-hardware";
390 }
391
392 static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
393 {
394 int colon = 0, r = 0;
395 struct perf_event_attr *attr = &evsel->attr;
396 bool exclude_guest_default = false;
397
398 #define MOD_PRINT(context, mod) do { \
399 if (!attr->exclude_##context) { \
400 if (!colon) colon = ++r; \
401 r += scnprintf(bf + r, size - r, "%c", mod); \
402 } } while(0)
403
404 if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
405 MOD_PRINT(kernel, 'k');
406 MOD_PRINT(user, 'u');
407 MOD_PRINT(hv, 'h');
408 exclude_guest_default = true;
409 }
410
411 if (attr->precise_ip) {
412 if (!colon)
413 colon = ++r;
414 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
415 exclude_guest_default = true;
416 }
417
418 if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
419 MOD_PRINT(host, 'H');
420 MOD_PRINT(guest, 'G');
421 }
422 #undef MOD_PRINT
423 if (colon)
424 bf[colon - 1] = ':';
425 return r;
426 }
427
428 static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
429 {
430 int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
431 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
432 }
433
434 const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
435 "cpu-clock",
436 "task-clock",
437 "page-faults",
438 "context-switches",
439 "cpu-migrations",
440 "minor-faults",
441 "major-faults",
442 "alignment-faults",
443 "emulation-faults",
444 "dummy",
445 };
446
447 static const char *__perf_evsel__sw_name(u64 config)
448 {
449 if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
450 return perf_evsel__sw_names[config];
451 return "unknown-software";
452 }
453
454 static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
455 {
456 int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
457 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
458 }
459
460 static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
461 {
462 int r;
463
464 r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
465
466 if (type & HW_BREAKPOINT_R)
467 r += scnprintf(bf + r, size - r, "r");
468
469 if (type & HW_BREAKPOINT_W)
470 r += scnprintf(bf + r, size - r, "w");
471
472 if (type & HW_BREAKPOINT_X)
473 r += scnprintf(bf + r, size - r, "x");
474
475 return r;
476 }
477
478 static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
479 {
480 struct perf_event_attr *attr = &evsel->attr;
481 int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
482 return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
483 }
484
485 const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
486 [PERF_EVSEL__MAX_ALIASES] = {
487 { "L1-dcache", "l1-d", "l1d", "L1-data", },
488 { "L1-icache", "l1-i", "l1i", "L1-instruction", },
489 { "LLC", "L2", },
490 { "dTLB", "d-tlb", "Data-TLB", },
491 { "iTLB", "i-tlb", "Instruction-TLB", },
492 { "branch", "branches", "bpu", "btb", "bpc", },
493 { "node", },
494 };
495
496 const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
497 [PERF_EVSEL__MAX_ALIASES] = {
498 { "load", "loads", "read", },
499 { "store", "stores", "write", },
500 { "prefetch", "prefetches", "speculative-read", "speculative-load", },
501 };
502
503 const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
504 [PERF_EVSEL__MAX_ALIASES] = {
505 { "refs", "Reference", "ops", "access", },
506 { "misses", "miss", },
507 };
508
509 #define C(x) PERF_COUNT_HW_CACHE_##x
510 #define CACHE_READ (1 << C(OP_READ))
511 #define CACHE_WRITE (1 << C(OP_WRITE))
512 #define CACHE_PREFETCH (1 << C(OP_PREFETCH))
513 #define COP(x) (1 << x)
514
515 /*
516 * cache operartion stat
517 * L1I : Read and prefetch only
518 * ITLB and BPU : Read-only
519 */
520 static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
521 [C(L1D)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
522 [C(L1I)] = (CACHE_READ | CACHE_PREFETCH),
523 [C(LL)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
524 [C(DTLB)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
525 [C(ITLB)] = (CACHE_READ),
526 [C(BPU)] = (CACHE_READ),
527 [C(NODE)] = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
528 };
529
530 bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
531 {
532 if (perf_evsel__hw_cache_stat[type] & COP(op))
533 return true; /* valid */
534 else
535 return false; /* invalid */
536 }
537
538 int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
539 char *bf, size_t size)
540 {
541 if (result) {
542 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
543 perf_evsel__hw_cache_op[op][0],
544 perf_evsel__hw_cache_result[result][0]);
545 }
546
547 return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
548 perf_evsel__hw_cache_op[op][1]);
549 }
550
551 static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
552 {
553 u8 op, result, type = (config >> 0) & 0xff;
554 const char *err = "unknown-ext-hardware-cache-type";
555
556 if (type >= PERF_COUNT_HW_CACHE_MAX)
557 goto out_err;
558
559 op = (config >> 8) & 0xff;
560 err = "unknown-ext-hardware-cache-op";
561 if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
562 goto out_err;
563
564 result = (config >> 16) & 0xff;
565 err = "unknown-ext-hardware-cache-result";
566 if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
567 goto out_err;
568
569 err = "invalid-cache";
570 if (!perf_evsel__is_cache_op_valid(type, op))
571 goto out_err;
572
573 return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
574 out_err:
575 return scnprintf(bf, size, "%s", err);
576 }
577
578 static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
579 {
580 int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
581 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
582 }
583
584 static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
585 {
586 int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
587 return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
588 }
589
590 const char *perf_evsel__name(struct perf_evsel *evsel)
591 {
592 char bf[128];
593
594 if (evsel->name)
595 return evsel->name;
596
597 switch (evsel->attr.type) {
598 case PERF_TYPE_RAW:
599 perf_evsel__raw_name(evsel, bf, sizeof(bf));
600 break;
601
602 case PERF_TYPE_HARDWARE:
603 perf_evsel__hw_name(evsel, bf, sizeof(bf));
604 break;
605
606 case PERF_TYPE_HW_CACHE:
607 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
608 break;
609
610 case PERF_TYPE_SOFTWARE:
611 perf_evsel__sw_name(evsel, bf, sizeof(bf));
612 break;
613
614 case PERF_TYPE_TRACEPOINT:
615 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
616 break;
617
618 case PERF_TYPE_BREAKPOINT:
619 perf_evsel__bp_name(evsel, bf, sizeof(bf));
620 break;
621
622 default:
623 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
624 evsel->attr.type);
625 break;
626 }
627
628 evsel->name = strdup(bf);
629
630 return evsel->name ?: "unknown";
631 }
632
633 const char *perf_evsel__group_name(struct perf_evsel *evsel)
634 {
635 return evsel->group_name ?: "anon group";
636 }
637
638 /*
639 * Returns the group details for the specified leader,
640 * with following rules.
641 *
642 * For record -e '{cycles,instructions}'
643 * 'anon group { cycles:u, instructions:u }'
644 *
645 * For record -e 'cycles,instructions' and report --group
646 * 'cycles:u, instructions:u'
647 */
648 int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
649 {
650 int ret = 0;
651 struct perf_evsel *pos;
652 const char *group_name = perf_evsel__group_name(evsel);
653
654 if (!evsel->forced_leader)
655 ret = scnprintf(buf, size, "%s { ", group_name);
656
657 ret += scnprintf(buf + ret, size - ret, "%s",
658 perf_evsel__name(evsel));
659
660 for_each_group_member(pos, evsel)
661 ret += scnprintf(buf + ret, size - ret, ", %s",
662 perf_evsel__name(pos));
663
664 if (!evsel->forced_leader)
665 ret += scnprintf(buf + ret, size - ret, " }");
666
667 return ret;
668 }
669
670 static void __perf_evsel__config_callchain(struct perf_evsel *evsel,
671 struct record_opts *opts,
672 struct callchain_param *param)
673 {
674 bool function = perf_evsel__is_function_event(evsel);
675 struct perf_event_attr *attr = &evsel->attr;
676
677 perf_evsel__set_sample_bit(evsel, CALLCHAIN);
678
679 attr->sample_max_stack = param->max_stack;
680
681 if (param->record_mode == CALLCHAIN_LBR) {
682 if (!opts->branch_stack) {
683 if (attr->exclude_user) {
684 pr_warning("LBR callstack option is only available "
685 "to get user callchain information. "
686 "Falling back to framepointers.\n");
687 } else {
688 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
689 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
690 PERF_SAMPLE_BRANCH_CALL_STACK |
691 PERF_SAMPLE_BRANCH_NO_CYCLES |
692 PERF_SAMPLE_BRANCH_NO_FLAGS;
693 }
694 } else
695 pr_warning("Cannot use LBR callstack with branch stack. "
696 "Falling back to framepointers.\n");
697 }
698
699 if (param->record_mode == CALLCHAIN_DWARF) {
700 if (!function) {
701 perf_evsel__set_sample_bit(evsel, REGS_USER);
702 perf_evsel__set_sample_bit(evsel, STACK_USER);
703 attr->sample_regs_user |= PERF_REGS_MASK;
704 attr->sample_stack_user = param->dump_size;
705 attr->exclude_callchain_user = 1;
706 } else {
707 pr_info("Cannot use DWARF unwind for function trace event,"
708 " falling back to framepointers.\n");
709 }
710 }
711
712 if (function) {
713 pr_info("Disabling user space callchains for function trace event.\n");
714 attr->exclude_callchain_user = 1;
715 }
716 }
717
718 void perf_evsel__config_callchain(struct perf_evsel *evsel,
719 struct record_opts *opts,
720 struct callchain_param *param)
721 {
722 if (param->enabled)
723 return __perf_evsel__config_callchain(evsel, opts, param);
724 }
725
726 static void
727 perf_evsel__reset_callgraph(struct perf_evsel *evsel,
728 struct callchain_param *param)
729 {
730 struct perf_event_attr *attr = &evsel->attr;
731
732 perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
733 if (param->record_mode == CALLCHAIN_LBR) {
734 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
735 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
736 PERF_SAMPLE_BRANCH_CALL_STACK);
737 }
738 if (param->record_mode == CALLCHAIN_DWARF) {
739 perf_evsel__reset_sample_bit(evsel, REGS_USER);
740 perf_evsel__reset_sample_bit(evsel, STACK_USER);
741 }
742 }
743
744 static void apply_config_terms(struct perf_evsel *evsel,
745 struct record_opts *opts, bool track)
746 {
747 struct perf_evsel_config_term *term;
748 struct list_head *config_terms = &evsel->config_terms;
749 struct perf_event_attr *attr = &evsel->attr;
750 /* callgraph default */
751 struct callchain_param param = {
752 .record_mode = callchain_param.record_mode,
753 };
754 u32 dump_size = 0;
755 int max_stack = 0;
756 const char *callgraph_buf = NULL;
757
758 list_for_each_entry(term, config_terms, list) {
759 switch (term->type) {
760 case PERF_EVSEL__CONFIG_TERM_PERIOD:
761 if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
762 attr->sample_period = term->val.period;
763 attr->freq = 0;
764 perf_evsel__reset_sample_bit(evsel, PERIOD);
765 }
766 break;
767 case PERF_EVSEL__CONFIG_TERM_FREQ:
768 if (!(term->weak && opts->user_freq != UINT_MAX)) {
769 attr->sample_freq = term->val.freq;
770 attr->freq = 1;
771 perf_evsel__set_sample_bit(evsel, PERIOD);
772 }
773 break;
774 case PERF_EVSEL__CONFIG_TERM_TIME:
775 if (term->val.time)
776 perf_evsel__set_sample_bit(evsel, TIME);
777 else
778 perf_evsel__reset_sample_bit(evsel, TIME);
779 break;
780 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
781 callgraph_buf = term->val.callgraph;
782 break;
783 case PERF_EVSEL__CONFIG_TERM_BRANCH:
784 if (term->val.branch && strcmp(term->val.branch, "no")) {
785 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
786 parse_branch_str(term->val.branch,
787 &attr->branch_sample_type);
788 } else
789 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
790 break;
791 case PERF_EVSEL__CONFIG_TERM_STACK_USER:
792 dump_size = term->val.stack_user;
793 break;
794 case PERF_EVSEL__CONFIG_TERM_MAX_STACK:
795 max_stack = term->val.max_stack;
796 break;
797 case PERF_EVSEL__CONFIG_TERM_MAX_EVENTS:
798 evsel->max_events = term->val.max_events;
799 break;
800 case PERF_EVSEL__CONFIG_TERM_INHERIT:
801 /*
802 * attr->inherit should has already been set by
803 * perf_evsel__config. If user explicitly set
804 * inherit using config terms, override global
805 * opt->no_inherit setting.
806 */
807 attr->inherit = term->val.inherit ? 1 : 0;
808 break;
809 case PERF_EVSEL__CONFIG_TERM_OVERWRITE:
810 attr->write_backward = term->val.overwrite ? 1 : 0;
811 break;
812 case PERF_EVSEL__CONFIG_TERM_DRV_CFG:
813 break;
814 default:
815 break;
816 }
817 }
818
819 /* User explicitly set per-event callgraph, clear the old setting and reset. */
820 if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
821 bool sample_address = false;
822
823 if (max_stack) {
824 param.max_stack = max_stack;
825 if (callgraph_buf == NULL)
826 callgraph_buf = "fp";
827 }
828
829 /* parse callgraph parameters */
830 if (callgraph_buf != NULL) {
831 if (!strcmp(callgraph_buf, "no")) {
832 param.enabled = false;
833 param.record_mode = CALLCHAIN_NONE;
834 } else {
835 param.enabled = true;
836 if (parse_callchain_record(callgraph_buf, &param)) {
837 pr_err("per-event callgraph setting for %s failed. "
838 "Apply callgraph global setting for it\n",
839 evsel->name);
840 return;
841 }
842 if (param.record_mode == CALLCHAIN_DWARF)
843 sample_address = true;
844 }
845 }
846 if (dump_size > 0) {
847 dump_size = round_up(dump_size, sizeof(u64));
848 param.dump_size = dump_size;
849 }
850
851 /* If global callgraph set, clear it */
852 if (callchain_param.enabled)
853 perf_evsel__reset_callgraph(evsel, &callchain_param);
854
855 /* set perf-event callgraph */
856 if (param.enabled) {
857 if (sample_address) {
858 perf_evsel__set_sample_bit(evsel, ADDR);
859 perf_evsel__set_sample_bit(evsel, DATA_SRC);
860 evsel->attr.mmap_data = track;
861 }
862 perf_evsel__config_callchain(evsel, opts, &param);
863 }
864 }
865 }
866
867 static bool is_dummy_event(struct perf_evsel *evsel)
868 {
869 return (evsel->attr.type == PERF_TYPE_SOFTWARE) &&
870 (evsel->attr.config == PERF_COUNT_SW_DUMMY);
871 }
872
873 /*
874 * The enable_on_exec/disabled value strategy:
875 *
876 * 1) For any type of traced program:
877 * - all independent events and group leaders are disabled
878 * - all group members are enabled
879 *
880 * Group members are ruled by group leaders. They need to
881 * be enabled, because the group scheduling relies on that.
882 *
883 * 2) For traced programs executed by perf:
884 * - all independent events and group leaders have
885 * enable_on_exec set
886 * - we don't specifically enable or disable any event during
887 * the record command
888 *
889 * Independent events and group leaders are initially disabled
890 * and get enabled by exec. Group members are ruled by group
891 * leaders as stated in 1).
892 *
893 * 3) For traced programs attached by perf (pid/tid):
894 * - we specifically enable or disable all events during
895 * the record command
896 *
897 * When attaching events to already running traced we
898 * enable/disable events specifically, as there's no
899 * initial traced exec call.
900 */
901 void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
902 struct callchain_param *callchain)
903 {
904 struct perf_evsel *leader = evsel->leader;
905 struct perf_event_attr *attr = &evsel->attr;
906 int track = evsel->tracking;
907 bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
908
909 attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
910 attr->inherit = !opts->no_inherit;
911 attr->write_backward = opts->overwrite ? 1 : 0;
912
913 perf_evsel__set_sample_bit(evsel, IP);
914 perf_evsel__set_sample_bit(evsel, TID);
915
916 if (evsel->sample_read) {
917 perf_evsel__set_sample_bit(evsel, READ);
918
919 /*
920 * We need ID even in case of single event, because
921 * PERF_SAMPLE_READ process ID specific data.
922 */
923 perf_evsel__set_sample_id(evsel, false);
924
925 /*
926 * Apply group format only if we belong to group
927 * with more than one members.
928 */
929 if (leader->nr_members > 1) {
930 attr->read_format |= PERF_FORMAT_GROUP;
931 attr->inherit = 0;
932 }
933 }
934
935 /*
936 * We default some events to have a default interval. But keep
937 * it a weak assumption overridable by the user.
938 */
939 if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
940 opts->user_interval != ULLONG_MAX)) {
941 if (opts->freq) {
942 perf_evsel__set_sample_bit(evsel, PERIOD);
943 attr->freq = 1;
944 attr->sample_freq = opts->freq;
945 } else {
946 attr->sample_period = opts->default_interval;
947 }
948 }
949
950 /*
951 * Disable sampling for all group members other
952 * than leader in case leader 'leads' the sampling.
953 */
954 if ((leader != evsel) && leader->sample_read) {
955 attr->freq = 0;
956 attr->sample_freq = 0;
957 attr->sample_period = 0;
958 attr->write_backward = 0;
959 }
960
961 if (opts->no_samples)
962 attr->sample_freq = 0;
963
964 if (opts->inherit_stat) {
965 evsel->attr.read_format |=
966 PERF_FORMAT_TOTAL_TIME_ENABLED |
967 PERF_FORMAT_TOTAL_TIME_RUNNING |
968 PERF_FORMAT_ID;
969 attr->inherit_stat = 1;
970 }
971
972 if (opts->sample_address) {
973 perf_evsel__set_sample_bit(evsel, ADDR);
974 attr->mmap_data = track;
975 }
976
977 /*
978 * We don't allow user space callchains for function trace
979 * event, due to issues with page faults while tracing page
980 * fault handler and its overall trickiness nature.
981 */
982 if (perf_evsel__is_function_event(evsel))
983 evsel->attr.exclude_callchain_user = 1;
984
985 if (callchain && callchain->enabled && !evsel->no_aux_samples)
986 perf_evsel__config_callchain(evsel, opts, callchain);
987
988 if (opts->sample_intr_regs) {
989 attr->sample_regs_intr = opts->sample_intr_regs;
990 perf_evsel__set_sample_bit(evsel, REGS_INTR);
991 }
992
993 if (opts->sample_user_regs) {
994 attr->sample_regs_user |= opts->sample_user_regs;
995 perf_evsel__set_sample_bit(evsel, REGS_USER);
996 }
997
998 if (target__has_cpu(&opts->target) || opts->sample_cpu)
999 perf_evsel__set_sample_bit(evsel, CPU);
1000
1001 /*
1002 * When the user explicitly disabled time don't force it here.
1003 */
1004 if (opts->sample_time &&
1005 (!perf_missing_features.sample_id_all &&
1006 (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
1007 opts->sample_time_set)))
1008 perf_evsel__set_sample_bit(evsel, TIME);
1009
1010 if (opts->raw_samples && !evsel->no_aux_samples) {
1011 perf_evsel__set_sample_bit(evsel, TIME);
1012 perf_evsel__set_sample_bit(evsel, RAW);
1013 perf_evsel__set_sample_bit(evsel, CPU);
1014 }
1015
1016 if (opts->sample_address)
1017 perf_evsel__set_sample_bit(evsel, DATA_SRC);
1018
1019 if (opts->sample_phys_addr)
1020 perf_evsel__set_sample_bit(evsel, PHYS_ADDR);
1021
1022 if (opts->no_buffering) {
1023 attr->watermark = 0;
1024 attr->wakeup_events = 1;
1025 }
1026 if (opts->branch_stack && !evsel->no_aux_samples) {
1027 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
1028 attr->branch_sample_type = opts->branch_stack;
1029 }
1030
1031 if (opts->sample_weight)
1032 perf_evsel__set_sample_bit(evsel, WEIGHT);
1033
1034 attr->task = track;
1035 attr->mmap = track;
1036 attr->mmap2 = track && !perf_missing_features.mmap2;
1037 attr->comm = track;
1038
1039 if (opts->record_namespaces)
1040 attr->namespaces = track;
1041
1042 if (opts->record_switch_events)
1043 attr->context_switch = track;
1044
1045 if (opts->sample_transaction)
1046 perf_evsel__set_sample_bit(evsel, TRANSACTION);
1047
1048 if (opts->running_time) {
1049 evsel->attr.read_format |=
1050 PERF_FORMAT_TOTAL_TIME_ENABLED |
1051 PERF_FORMAT_TOTAL_TIME_RUNNING;
1052 }
1053
1054 /*
1055 * XXX see the function comment above
1056 *
1057 * Disabling only independent events or group leaders,
1058 * keeping group members enabled.
1059 */
1060 if (perf_evsel__is_group_leader(evsel))
1061 attr->disabled = 1;
1062
1063 /*
1064 * Setting enable_on_exec for independent events and
1065 * group leaders for traced executed by perf.
1066 */
1067 if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
1068 !opts->initial_delay)
1069 attr->enable_on_exec = 1;
1070
1071 if (evsel->immediate) {
1072 attr->disabled = 0;
1073 attr->enable_on_exec = 0;
1074 }
1075
1076 clockid = opts->clockid;
1077 if (opts->use_clockid) {
1078 attr->use_clockid = 1;
1079 attr->clockid = opts->clockid;
1080 }
1081
1082 if (evsel->precise_max)
1083 perf_event_attr__set_max_precise_ip(attr);
1084
1085 if (opts->all_user) {
1086 attr->exclude_kernel = 1;
1087 attr->exclude_user = 0;
1088 }
1089
1090 if (opts->all_kernel) {
1091 attr->exclude_kernel = 0;
1092 attr->exclude_user = 1;
1093 }
1094
1095 if (evsel->own_cpus || evsel->unit)
1096 evsel->attr.read_format |= PERF_FORMAT_ID;
1097
1098 /*
1099 * Apply event specific term settings,
1100 * it overloads any global configuration.
1101 */
1102 apply_config_terms(evsel, opts, track);
1103
1104 evsel->ignore_missing_thread = opts->ignore_missing_thread;
1105
1106 /* The --period option takes the precedence. */
1107 if (opts->period_set) {
1108 if (opts->period)
1109 perf_evsel__set_sample_bit(evsel, PERIOD);
1110 else
1111 perf_evsel__reset_sample_bit(evsel, PERIOD);
1112 }
1113
1114 /*
1115 * For initial_delay, a dummy event is added implicitly.
1116 * The software event will trigger -EOPNOTSUPP error out,
1117 * if BRANCH_STACK bit is set.
1118 */
1119 if (opts->initial_delay && is_dummy_event(evsel))
1120 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
1121 }
1122
1123 static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
1124 {
1125 if (evsel->system_wide)
1126 nthreads = 1;
1127
1128 evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
1129
1130 if (evsel->fd) {
1131 int cpu, thread;
1132 for (cpu = 0; cpu < ncpus; cpu++) {
1133 for (thread = 0; thread < nthreads; thread++) {
1134 FD(evsel, cpu, thread) = -1;
1135 }
1136 }
1137 }
1138
1139 return evsel->fd != NULL ? 0 : -ENOMEM;
1140 }
1141
1142 static int perf_evsel__run_ioctl(struct perf_evsel *evsel,
1143 int ioc, void *arg)
1144 {
1145 int cpu, thread;
1146
1147 for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++) {
1148 for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
1149 int fd = FD(evsel, cpu, thread),
1150 err = ioctl(fd, ioc, arg);
1151
1152 if (err)
1153 return err;
1154 }
1155 }
1156
1157 return 0;
1158 }
1159
1160 int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter)
1161 {
1162 return perf_evsel__run_ioctl(evsel,
1163 PERF_EVENT_IOC_SET_FILTER,
1164 (void *)filter);
1165 }
1166
1167 int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
1168 {
1169 char *new_filter = strdup(filter);
1170
1171 if (new_filter != NULL) {
1172 free(evsel->filter);
1173 evsel->filter = new_filter;
1174 return 0;
1175 }
1176
1177 return -1;
1178 }
1179
1180 static int perf_evsel__append_filter(struct perf_evsel *evsel,
1181 const char *fmt, const char *filter)
1182 {
1183 char *new_filter;
1184
1185 if (evsel->filter == NULL)
1186 return perf_evsel__set_filter(evsel, filter);
1187
1188 if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1189 free(evsel->filter);
1190 evsel->filter = new_filter;
1191 return 0;
1192 }
1193
1194 return -1;
1195 }
1196
1197 int perf_evsel__append_tp_filter(struct perf_evsel *evsel, const char *filter)
1198 {
1199 return perf_evsel__append_filter(evsel, "(%s) && (%s)", filter);
1200 }
1201
1202 int perf_evsel__append_addr_filter(struct perf_evsel *evsel, const char *filter)
1203 {
1204 return perf_evsel__append_filter(evsel, "%s,%s", filter);
1205 }
1206
1207 int perf_evsel__enable(struct perf_evsel *evsel)
1208 {
1209 int err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, 0);
1210
1211 if (!err)
1212 evsel->disabled = false;
1213
1214 return err;
1215 }
1216
1217 int perf_evsel__disable(struct perf_evsel *evsel)
1218 {
1219 int err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, 0);
1220 /*
1221 * We mark it disabled here so that tools that disable a event can
1222 * ignore events after they disable it. I.e. the ring buffer may have
1223 * already a few more events queued up before the kernel got the stop
1224 * request.
1225 */
1226 if (!err)
1227 evsel->disabled = true;
1228
1229 return err;
1230 }
1231
1232 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
1233 {
1234 if (ncpus == 0 || nthreads == 0)
1235 return 0;
1236
1237 if (evsel->system_wide)
1238 nthreads = 1;
1239
1240 evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
1241 if (evsel->sample_id == NULL)
1242 return -ENOMEM;
1243
1244 evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
1245 if (evsel->id == NULL) {
1246 xyarray__delete(evsel->sample_id);
1247 evsel->sample_id = NULL;
1248 return -ENOMEM;
1249 }
1250
1251 return 0;
1252 }
1253
1254 static void perf_evsel__free_fd(struct perf_evsel *evsel)
1255 {
1256 xyarray__delete(evsel->fd);
1257 evsel->fd = NULL;
1258 }
1259
1260 static void perf_evsel__free_id(struct perf_evsel *evsel)
1261 {
1262 xyarray__delete(evsel->sample_id);
1263 evsel->sample_id = NULL;
1264 zfree(&evsel->id);
1265 }
1266
1267 static void perf_evsel__free_config_terms(struct perf_evsel *evsel)
1268 {
1269 struct perf_evsel_config_term *term, *h;
1270
1271 list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1272 list_del(&term->list);
1273 free(term);
1274 }
1275 }
1276
1277 void perf_evsel__close_fd(struct perf_evsel *evsel)
1278 {
1279 int cpu, thread;
1280
1281 for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++)
1282 for (thread = 0; thread < xyarray__max_y(evsel->fd); ++thread) {
1283 close(FD(evsel, cpu, thread));
1284 FD(evsel, cpu, thread) = -1;
1285 }
1286 }
1287
1288 void perf_evsel__exit(struct perf_evsel *evsel)
1289 {
1290 assert(list_empty(&evsel->node));
1291 assert(evsel->evlist == NULL);
1292 perf_evsel__free_fd(evsel);
1293 perf_evsel__free_id(evsel);
1294 perf_evsel__free_config_terms(evsel);
1295 cgroup__put(evsel->cgrp);
1296 cpu_map__put(evsel->cpus);
1297 cpu_map__put(evsel->own_cpus);
1298 thread_map__put(evsel->threads);
1299 zfree(&evsel->group_name);
1300 zfree(&evsel->name);
1301 perf_evsel__object.fini(evsel);
1302 }
1303
1304 void perf_evsel__delete(struct perf_evsel *evsel)
1305 {
1306 perf_evsel__exit(evsel);
1307 free(evsel);
1308 }
1309
1310 void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu, int thread,
1311 struct perf_counts_values *count)
1312 {
1313 struct perf_counts_values tmp;
1314
1315 if (!evsel->prev_raw_counts)
1316 return;
1317
1318 if (cpu == -1) {
1319 tmp = evsel->prev_raw_counts->aggr;
1320 evsel->prev_raw_counts->aggr = *count;
1321 } else {
1322 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1323 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1324 }
1325
1326 count->val = count->val - tmp.val;
1327 count->ena = count->ena - tmp.ena;
1328 count->run = count->run - tmp.run;
1329 }
1330
1331 void perf_counts_values__scale(struct perf_counts_values *count,
1332 bool scale, s8 *pscaled)
1333 {
1334 s8 scaled = 0;
1335
1336 if (scale) {
1337 if (count->run == 0) {
1338 scaled = -1;
1339 count->val = 0;
1340 } else if (count->run < count->ena) {
1341 scaled = 1;
1342 count->val = (u64)((double) count->val * count->ena / count->run + 0.5);
1343 }
1344 } else
1345 count->ena = count->run = 0;
1346
1347 if (pscaled)
1348 *pscaled = scaled;
1349 }
1350
1351 static int perf_evsel__read_size(struct perf_evsel *evsel)
1352 {
1353 u64 read_format = evsel->attr.read_format;
1354 int entry = sizeof(u64); /* value */
1355 int size = 0;
1356 int nr = 1;
1357
1358 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1359 size += sizeof(u64);
1360
1361 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1362 size += sizeof(u64);
1363
1364 if (read_format & PERF_FORMAT_ID)
1365 entry += sizeof(u64);
1366
1367 if (read_format & PERF_FORMAT_GROUP) {
1368 nr = evsel->nr_members;
1369 size += sizeof(u64);
1370 }
1371
1372 size += entry * nr;
1373 return size;
1374 }
1375
1376 int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
1377 struct perf_counts_values *count)
1378 {
1379 size_t size = perf_evsel__read_size(evsel);
1380
1381 memset(count, 0, sizeof(*count));
1382
1383 if (FD(evsel, cpu, thread) < 0)
1384 return -EINVAL;
1385
1386 if (readn(FD(evsel, cpu, thread), count->values, size) <= 0)
1387 return -errno;
1388
1389 return 0;
1390 }
1391
1392 static int
1393 perf_evsel__read_one(struct perf_evsel *evsel, int cpu, int thread)
1394 {
1395 struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread);
1396
1397 return perf_evsel__read(evsel, cpu, thread, count);
1398 }
1399
1400 static void
1401 perf_evsel__set_count(struct perf_evsel *counter, int cpu, int thread,
1402 u64 val, u64 ena, u64 run)
1403 {
1404 struct perf_counts_values *count;
1405
1406 count = perf_counts(counter->counts, cpu, thread);
1407
1408 count->val = val;
1409 count->ena = ena;
1410 count->run = run;
1411 count->loaded = true;
1412 }
1413
1414 static int
1415 perf_evsel__process_group_data(struct perf_evsel *leader,
1416 int cpu, int thread, u64 *data)
1417 {
1418 u64 read_format = leader->attr.read_format;
1419 struct sample_read_value *v;
1420 u64 nr, ena = 0, run = 0, i;
1421
1422 nr = *data++;
1423
1424 if (nr != (u64) leader->nr_members)
1425 return -EINVAL;
1426
1427 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1428 ena = *data++;
1429
1430 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1431 run = *data++;
1432
1433 v = (struct sample_read_value *) data;
1434
1435 perf_evsel__set_count(leader, cpu, thread,
1436 v[0].value, ena, run);
1437
1438 for (i = 1; i < nr; i++) {
1439 struct perf_evsel *counter;
1440
1441 counter = perf_evlist__id2evsel(leader->evlist, v[i].id);
1442 if (!counter)
1443 return -EINVAL;
1444
1445 perf_evsel__set_count(counter, cpu, thread,
1446 v[i].value, ena, run);
1447 }
1448
1449 return 0;
1450 }
1451
1452 static int
1453 perf_evsel__read_group(struct perf_evsel *leader, int cpu, int thread)
1454 {
1455 struct perf_stat_evsel *ps = leader->stats;
1456 u64 read_format = leader->attr.read_format;
1457 int size = perf_evsel__read_size(leader);
1458 u64 *data = ps->group_data;
1459
1460 if (!(read_format & PERF_FORMAT_ID))
1461 return -EINVAL;
1462
1463 if (!perf_evsel__is_group_leader(leader))
1464 return -EINVAL;
1465
1466 if (!data) {
1467 data = zalloc(size);
1468 if (!data)
1469 return -ENOMEM;
1470
1471 ps->group_data = data;
1472 }
1473
1474 if (FD(leader, cpu, thread) < 0)
1475 return -EINVAL;
1476
1477 if (readn(FD(leader, cpu, thread), data, size) <= 0)
1478 return -errno;
1479
1480 return perf_evsel__process_group_data(leader, cpu, thread, data);
1481 }
1482
1483 int perf_evsel__read_counter(struct perf_evsel *evsel, int cpu, int thread)
1484 {
1485 u64 read_format = evsel->attr.read_format;
1486
1487 if (read_format & PERF_FORMAT_GROUP)
1488 return perf_evsel__read_group(evsel, cpu, thread);
1489 else
1490 return perf_evsel__read_one(evsel, cpu, thread);
1491 }
1492
1493 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
1494 int cpu, int thread, bool scale)
1495 {
1496 struct perf_counts_values count;
1497 size_t nv = scale ? 3 : 1;
1498
1499 if (FD(evsel, cpu, thread) < 0)
1500 return -EINVAL;
1501
1502 if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1503 return -ENOMEM;
1504
1505 if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0)
1506 return -errno;
1507
1508 perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1509 perf_counts_values__scale(&count, scale, NULL);
1510 *perf_counts(evsel->counts, cpu, thread) = count;
1511 return 0;
1512 }
1513
1514 static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
1515 {
1516 struct perf_evsel *leader = evsel->leader;
1517 int fd;
1518
1519 if (perf_evsel__is_group_leader(evsel))
1520 return -1;
1521
1522 /*
1523 * Leader must be already processed/open,
1524 * if not it's a bug.
1525 */
1526 BUG_ON(!leader->fd);
1527
1528 fd = FD(leader, cpu, thread);
1529 BUG_ON(fd == -1);
1530
1531 return fd;
1532 }
1533
1534 struct bit_names {
1535 int bit;
1536 const char *name;
1537 };
1538
1539 static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits)
1540 {
1541 bool first_bit = true;
1542 int i = 0;
1543
1544 do {
1545 if (value & bits[i].bit) {
1546 buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name);
1547 first_bit = false;
1548 }
1549 } while (bits[++i].name != NULL);
1550 }
1551
1552 static void __p_sample_type(char *buf, size_t size, u64 value)
1553 {
1554 #define bit_name(n) { PERF_SAMPLE_##n, #n }
1555 struct bit_names bits[] = {
1556 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
1557 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
1558 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
1559 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
1560 bit_name(IDENTIFIER), bit_name(REGS_INTR), bit_name(DATA_SRC),
1561 bit_name(WEIGHT), bit_name(PHYS_ADDR),
1562 { .name = NULL, }
1563 };
1564 #undef bit_name
1565 __p_bits(buf, size, value, bits);
1566 }
1567
1568 static void __p_branch_sample_type(char *buf, size_t size, u64 value)
1569 {
1570 #define bit_name(n) { PERF_SAMPLE_BRANCH_##n, #n }
1571 struct bit_names bits[] = {
1572 bit_name(USER), bit_name(KERNEL), bit_name(HV), bit_name(ANY),
1573 bit_name(ANY_CALL), bit_name(ANY_RETURN), bit_name(IND_CALL),
1574 bit_name(ABORT_TX), bit_name(IN_TX), bit_name(NO_TX),
1575 bit_name(COND), bit_name(CALL_STACK), bit_name(IND_JUMP),
1576 bit_name(CALL), bit_name(NO_FLAGS), bit_name(NO_CYCLES),
1577 { .name = NULL, }
1578 };
1579 #undef bit_name
1580 __p_bits(buf, size, value, bits);
1581 }
1582
1583 static void __p_read_format(char *buf, size_t size, u64 value)
1584 {
1585 #define bit_name(n) { PERF_FORMAT_##n, #n }
1586 struct bit_names bits[] = {
1587 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
1588 bit_name(ID), bit_name(GROUP),
1589 { .name = NULL, }
1590 };
1591 #undef bit_name
1592 __p_bits(buf, size, value, bits);
1593 }
1594
1595 #define BUF_SIZE 1024
1596
1597 #define p_hex(val) snprintf(buf, BUF_SIZE, "%#"PRIx64, (uint64_t)(val))
1598 #define p_unsigned(val) snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val))
1599 #define p_signed(val) snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val))
1600 #define p_sample_type(val) __p_sample_type(buf, BUF_SIZE, val)
1601 #define p_branch_sample_type(val) __p_branch_sample_type(buf, BUF_SIZE, val)
1602 #define p_read_format(val) __p_read_format(buf, BUF_SIZE, val)
1603
1604 #define PRINT_ATTRn(_n, _f, _p) \
1605 do { \
1606 if (attr->_f) { \
1607 _p(attr->_f); \
1608 ret += attr__fprintf(fp, _n, buf, priv);\
1609 } \
1610 } while (0)
1611
1612 #define PRINT_ATTRf(_f, _p) PRINT_ATTRn(#_f, _f, _p)
1613
1614 int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
1615 attr__fprintf_f attr__fprintf, void *priv)
1616 {
1617 char buf[BUF_SIZE];
1618 int ret = 0;
1619
1620 PRINT_ATTRf(type, p_unsigned);
1621 PRINT_ATTRf(size, p_unsigned);
1622 PRINT_ATTRf(config, p_hex);
1623 PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned);
1624 PRINT_ATTRf(sample_type, p_sample_type);
1625 PRINT_ATTRf(read_format, p_read_format);
1626
1627 PRINT_ATTRf(disabled, p_unsigned);
1628 PRINT_ATTRf(inherit, p_unsigned);
1629 PRINT_ATTRf(pinned, p_unsigned);
1630 PRINT_ATTRf(exclusive, p_unsigned);
1631 PRINT_ATTRf(exclude_user, p_unsigned);
1632 PRINT_ATTRf(exclude_kernel, p_unsigned);
1633 PRINT_ATTRf(exclude_hv, p_unsigned);
1634 PRINT_ATTRf(exclude_idle, p_unsigned);
1635 PRINT_ATTRf(mmap, p_unsigned);
1636 PRINT_ATTRf(comm, p_unsigned);
1637 PRINT_ATTRf(freq, p_unsigned);
1638 PRINT_ATTRf(inherit_stat, p_unsigned);
1639 PRINT_ATTRf(enable_on_exec, p_unsigned);
1640 PRINT_ATTRf(task, p_unsigned);
1641 PRINT_ATTRf(watermark, p_unsigned);
1642 PRINT_ATTRf(precise_ip, p_unsigned);
1643 PRINT_ATTRf(mmap_data, p_unsigned);
1644 PRINT_ATTRf(sample_id_all, p_unsigned);
1645 PRINT_ATTRf(exclude_host, p_unsigned);
1646 PRINT_ATTRf(exclude_guest, p_unsigned);
1647 PRINT_ATTRf(exclude_callchain_kernel, p_unsigned);
1648 PRINT_ATTRf(exclude_callchain_user, p_unsigned);
1649 PRINT_ATTRf(mmap2, p_unsigned);
1650 PRINT_ATTRf(comm_exec, p_unsigned);
1651 PRINT_ATTRf(use_clockid, p_unsigned);
1652 PRINT_ATTRf(context_switch, p_unsigned);
1653 PRINT_ATTRf(write_backward, p_unsigned);
1654 PRINT_ATTRf(namespaces, p_unsigned);
1655
1656 PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
1657 PRINT_ATTRf(bp_type, p_unsigned);
1658 PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex);
1659 PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex);
1660 PRINT_ATTRf(branch_sample_type, p_branch_sample_type);
1661 PRINT_ATTRf(sample_regs_user, p_hex);
1662 PRINT_ATTRf(sample_stack_user, p_unsigned);
1663 PRINT_ATTRf(clockid, p_signed);
1664 PRINT_ATTRf(sample_regs_intr, p_hex);
1665 PRINT_ATTRf(aux_watermark, p_unsigned);
1666 PRINT_ATTRf(sample_max_stack, p_unsigned);
1667
1668 return ret;
1669 }
1670
1671 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1672 void *priv __maybe_unused)
1673 {
1674 return fprintf(fp, " %-32s %s\n", name, val);
1675 }
1676
1677 static void perf_evsel__remove_fd(struct perf_evsel *pos,
1678 int nr_cpus, int nr_threads,
1679 int thread_idx)
1680 {
1681 for (int cpu = 0; cpu < nr_cpus; cpu++)
1682 for (int thread = thread_idx; thread < nr_threads - 1; thread++)
1683 FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
1684 }
1685
1686 static int update_fds(struct perf_evsel *evsel,
1687 int nr_cpus, int cpu_idx,
1688 int nr_threads, int thread_idx)
1689 {
1690 struct perf_evsel *pos;
1691
1692 if (cpu_idx >= nr_cpus || thread_idx >= nr_threads)
1693 return -EINVAL;
1694
1695 evlist__for_each_entry(evsel->evlist, pos) {
1696 nr_cpus = pos != evsel ? nr_cpus : cpu_idx;
1697
1698 perf_evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
1699
1700 /*
1701 * Since fds for next evsel has not been created,
1702 * there is no need to iterate whole event list.
1703 */
1704 if (pos == evsel)
1705 break;
1706 }
1707 return 0;
1708 }
1709
1710 static bool ignore_missing_thread(struct perf_evsel *evsel,
1711 int nr_cpus, int cpu,
1712 struct thread_map *threads,
1713 int thread, int err)
1714 {
1715 pid_t ignore_pid = thread_map__pid(threads, thread);
1716
1717 if (!evsel->ignore_missing_thread)
1718 return false;
1719
1720 /* The system wide setup does not work with threads. */
1721 if (evsel->system_wide)
1722 return false;
1723
1724 /* The -ESRCH is perf event syscall errno for pid's not found. */
1725 if (err != -ESRCH)
1726 return false;
1727
1728 /* If there's only one thread, let it fail. */
1729 if (threads->nr == 1)
1730 return false;
1731
1732 /*
1733 * We should remove fd for missing_thread first
1734 * because thread_map__remove() will decrease threads->nr.
1735 */
1736 if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread))
1737 return false;
1738
1739 if (thread_map__remove(threads, thread))
1740 return false;
1741
1742 pr_warning("WARNING: Ignored open failure for pid %d\n",
1743 ignore_pid);
1744 return true;
1745 }
1746
1747 int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1748 struct thread_map *threads)
1749 {
1750 int cpu, thread, nthreads;
1751 unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1752 int pid = -1, err;
1753 enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1754
1755 if (perf_missing_features.write_backward && evsel->attr.write_backward)
1756 return -EINVAL;
1757
1758 if (cpus == NULL) {
1759 static struct cpu_map *empty_cpu_map;
1760
1761 if (empty_cpu_map == NULL) {
1762 empty_cpu_map = cpu_map__dummy_new();
1763 if (empty_cpu_map == NULL)
1764 return -ENOMEM;
1765 }
1766
1767 cpus = empty_cpu_map;
1768 }
1769
1770 if (threads == NULL) {
1771 static struct thread_map *empty_thread_map;
1772
1773 if (empty_thread_map == NULL) {
1774 empty_thread_map = thread_map__new_by_tid(-1);
1775 if (empty_thread_map == NULL)
1776 return -ENOMEM;
1777 }
1778
1779 threads = empty_thread_map;
1780 }
1781
1782 if (evsel->system_wide)
1783 nthreads = 1;
1784 else
1785 nthreads = threads->nr;
1786
1787 if (evsel->fd == NULL &&
1788 perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0)
1789 return -ENOMEM;
1790
1791 if (evsel->cgrp) {
1792 flags |= PERF_FLAG_PID_CGROUP;
1793 pid = evsel->cgrp->fd;
1794 }
1795
1796 fallback_missing_features:
1797 if (perf_missing_features.clockid_wrong)
1798 evsel->attr.clockid = CLOCK_MONOTONIC; /* should always work */
1799 if (perf_missing_features.clockid) {
1800 evsel->attr.use_clockid = 0;
1801 evsel->attr.clockid = 0;
1802 }
1803 if (perf_missing_features.cloexec)
1804 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1805 if (perf_missing_features.mmap2)
1806 evsel->attr.mmap2 = 0;
1807 if (perf_missing_features.exclude_guest)
1808 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
1809 if (perf_missing_features.lbr_flags)
1810 evsel->attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1811 PERF_SAMPLE_BRANCH_NO_CYCLES);
1812 if (perf_missing_features.group_read && evsel->attr.inherit)
1813 evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
1814 retry_sample_id:
1815 if (perf_missing_features.sample_id_all)
1816 evsel->attr.sample_id_all = 0;
1817
1818 if (verbose >= 2) {
1819 fprintf(stderr, "%.60s\n", graph_dotted_line);
1820 fprintf(stderr, "perf_event_attr:\n");
1821 perf_event_attr__fprintf(stderr, &evsel->attr, __open_attr__fprintf, NULL);
1822 fprintf(stderr, "%.60s\n", graph_dotted_line);
1823 }
1824
1825 for (cpu = 0; cpu < cpus->nr; cpu++) {
1826
1827 for (thread = 0; thread < nthreads; thread++) {
1828 int fd, group_fd;
1829
1830 if (!evsel->cgrp && !evsel->system_wide)
1831 pid = thread_map__pid(threads, thread);
1832
1833 group_fd = get_group_fd(evsel, cpu, thread);
1834 retry_open:
1835 pr_debug2("sys_perf_event_open: pid %d cpu %d group_fd %d flags %#lx",
1836 pid, cpus->map[cpu], group_fd, flags);
1837
1838 test_attr__ready();
1839
1840 fd = sys_perf_event_open(&evsel->attr, pid, cpus->map[cpu],
1841 group_fd, flags);
1842
1843 FD(evsel, cpu, thread) = fd;
1844
1845 if (fd < 0) {
1846 err = -errno;
1847
1848 if (ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) {
1849 /*
1850 * We just removed 1 thread, so take a step
1851 * back on thread index and lower the upper
1852 * nthreads limit.
1853 */
1854 nthreads--;
1855 thread--;
1856
1857 /* ... and pretend like nothing have happened. */
1858 err = 0;
1859 continue;
1860 }
1861
1862 pr_debug2("\nsys_perf_event_open failed, error %d\n",
1863 err);
1864 goto try_fallback;
1865 }
1866
1867 pr_debug2(" = %d\n", fd);
1868
1869 if (evsel->bpf_fd >= 0) {
1870 int evt_fd = fd;
1871 int bpf_fd = evsel->bpf_fd;
1872
1873 err = ioctl(evt_fd,
1874 PERF_EVENT_IOC_SET_BPF,
1875 bpf_fd);
1876 if (err && errno != EEXIST) {
1877 pr_err("failed to attach bpf fd %d: %s\n",
1878 bpf_fd, strerror(errno));
1879 err = -EINVAL;
1880 goto out_close;
1881 }
1882 }
1883
1884 set_rlimit = NO_CHANGE;
1885
1886 /*
1887 * If we succeeded but had to kill clockid, fail and
1888 * have perf_evsel__open_strerror() print us a nice
1889 * error.
1890 */
1891 if (perf_missing_features.clockid ||
1892 perf_missing_features.clockid_wrong) {
1893 err = -EINVAL;
1894 goto out_close;
1895 }
1896 }
1897 }
1898
1899 return 0;
1900
1901 try_fallback:
1902 /*
1903 * perf stat needs between 5 and 22 fds per CPU. When we run out
1904 * of them try to increase the limits.
1905 */
1906 if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1907 struct rlimit l;
1908 int old_errno = errno;
1909
1910 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1911 if (set_rlimit == NO_CHANGE)
1912 l.rlim_cur = l.rlim_max;
1913 else {
1914 l.rlim_cur = l.rlim_max + 1000;
1915 l.rlim_max = l.rlim_cur;
1916 }
1917 if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1918 set_rlimit++;
1919 errno = old_errno;
1920 goto retry_open;
1921 }
1922 }
1923 errno = old_errno;
1924 }
1925
1926 if (err != -EINVAL || cpu > 0 || thread > 0)
1927 goto out_close;
1928
1929 /*
1930 * Must probe features in the order they were added to the
1931 * perf_event_attr interface.
1932 */
1933 if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
1934 perf_missing_features.write_backward = true;
1935 pr_debug2("switching off write_backward\n");
1936 goto out_close;
1937 } else if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) {
1938 perf_missing_features.clockid_wrong = true;
1939 pr_debug2("switching off clockid\n");
1940 goto fallback_missing_features;
1941 } else if (!perf_missing_features.clockid && evsel->attr.use_clockid) {
1942 perf_missing_features.clockid = true;
1943 pr_debug2("switching off use_clockid\n");
1944 goto fallback_missing_features;
1945 } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
1946 perf_missing_features.cloexec = true;
1947 pr_debug2("switching off cloexec flag\n");
1948 goto fallback_missing_features;
1949 } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
1950 perf_missing_features.mmap2 = true;
1951 pr_debug2("switching off mmap2\n");
1952 goto fallback_missing_features;
1953 } else if (!perf_missing_features.exclude_guest &&
1954 (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
1955 perf_missing_features.exclude_guest = true;
1956 pr_debug2("switching off exclude_guest, exclude_host\n");
1957 goto fallback_missing_features;
1958 } else if (!perf_missing_features.sample_id_all) {
1959 perf_missing_features.sample_id_all = true;
1960 pr_debug2("switching off sample_id_all\n");
1961 goto retry_sample_id;
1962 } else if (!perf_missing_features.lbr_flags &&
1963 (evsel->attr.branch_sample_type &
1964 (PERF_SAMPLE_BRANCH_NO_CYCLES |
1965 PERF_SAMPLE_BRANCH_NO_FLAGS))) {
1966 perf_missing_features.lbr_flags = true;
1967 pr_debug2("switching off branch sample type no (cycles/flags)\n");
1968 goto fallback_missing_features;
1969 } else if (!perf_missing_features.group_read &&
1970 evsel->attr.inherit &&
1971 (evsel->attr.read_format & PERF_FORMAT_GROUP) &&
1972 perf_evsel__is_group_leader(evsel)) {
1973 perf_missing_features.group_read = true;
1974 pr_debug2("switching off group read\n");
1975 goto fallback_missing_features;
1976 }
1977 out_close:
1978 if (err)
1979 threads->err_thread = thread;
1980
1981 do {
1982 while (--thread >= 0) {
1983 close(FD(evsel, cpu, thread));
1984 FD(evsel, cpu, thread) = -1;
1985 }
1986 thread = nthreads;
1987 } while (--cpu >= 0);
1988 return err;
1989 }
1990
1991 void perf_evsel__close(struct perf_evsel *evsel)
1992 {
1993 if (evsel->fd == NULL)
1994 return;
1995
1996 perf_evsel__close_fd(evsel);
1997 perf_evsel__free_fd(evsel);
1998 }
1999
2000 int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
2001 struct cpu_map *cpus)
2002 {
2003 return perf_evsel__open(evsel, cpus, NULL);
2004 }
2005
2006 int perf_evsel__open_per_thread(struct perf_evsel *evsel,
2007 struct thread_map *threads)
2008 {
2009 return perf_evsel__open(evsel, NULL, threads);
2010 }
2011
2012 static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
2013 const union perf_event *event,
2014 struct perf_sample *sample)
2015 {
2016 u64 type = evsel->attr.sample_type;
2017 const u64 *array = event->sample.array;
2018 bool swapped = evsel->needs_swap;
2019 union u64_swap u;
2020
2021 array += ((event->header.size -
2022 sizeof(event->header)) / sizeof(u64)) - 1;
2023
2024 if (type & PERF_SAMPLE_IDENTIFIER) {
2025 sample->id = *array;
2026 array--;
2027 }
2028
2029 if (type & PERF_SAMPLE_CPU) {
2030 u.val64 = *array;
2031 if (swapped) {
2032 /* undo swap of u64, then swap on individual u32s */
2033 u.val64 = bswap_64(u.val64);
2034 u.val32[0] = bswap_32(u.val32[0]);
2035 }
2036
2037 sample->cpu = u.val32[0];
2038 array--;
2039 }
2040
2041 if (type & PERF_SAMPLE_STREAM_ID) {
2042 sample->stream_id = *array;
2043 array--;
2044 }
2045
2046 if (type & PERF_SAMPLE_ID) {
2047 sample->id = *array;
2048 array--;
2049 }
2050
2051 if (type & PERF_SAMPLE_TIME) {
2052 sample->time = *array;
2053 array--;
2054 }
2055
2056 if (type & PERF_SAMPLE_TID) {
2057 u.val64 = *array;
2058 if (swapped) {
2059 /* undo swap of u64, then swap on individual u32s */
2060 u.val64 = bswap_64(u.val64);
2061 u.val32[0] = bswap_32(u.val32[0]);
2062 u.val32[1] = bswap_32(u.val32[1]);
2063 }
2064
2065 sample->pid = u.val32[0];
2066 sample->tid = u.val32[1];
2067 array--;
2068 }
2069
2070 return 0;
2071 }
2072
2073 static inline bool overflow(const void *endp, u16 max_size, const void *offset,
2074 u64 size)
2075 {
2076 return size > max_size || offset + size > endp;
2077 }
2078
2079 #define OVERFLOW_CHECK(offset, size, max_size) \
2080 do { \
2081 if (overflow(endp, (max_size), (offset), (size))) \
2082 return -EFAULT; \
2083 } while (0)
2084
2085 #define OVERFLOW_CHECK_u64(offset) \
2086 OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
2087
2088 static int
2089 perf_event__check_size(union perf_event *event, unsigned int sample_size)
2090 {
2091 /*
2092 * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
2093 * up to PERF_SAMPLE_PERIOD. After that overflow() must be used to
2094 * check the format does not go past the end of the event.
2095 */
2096 if (sample_size + sizeof(event->header) > event->header.size)
2097 return -EFAULT;
2098
2099 return 0;
2100 }
2101
2102 int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
2103 struct perf_sample *data)
2104 {
2105 u64 type = evsel->attr.sample_type;
2106 bool swapped = evsel->needs_swap;
2107 const u64 *array;
2108 u16 max_size = event->header.size;
2109 const void *endp = (void *)event + max_size;
2110 u64 sz;
2111
2112 /*
2113 * used for cross-endian analysis. See git commit 65014ab3
2114 * for why this goofiness is needed.
2115 */
2116 union u64_swap u;
2117
2118 memset(data, 0, sizeof(*data));
2119 data->cpu = data->pid = data->tid = -1;
2120 data->stream_id = data->id = data->time = -1ULL;
2121 data->period = evsel->attr.sample_period;
2122 data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
2123 data->misc = event->header.misc;
2124 data->id = -1ULL;
2125 data->data_src = PERF_MEM_DATA_SRC_NONE;
2126
2127 if (event->header.type != PERF_RECORD_SAMPLE) {
2128 if (!evsel->attr.sample_id_all)
2129 return 0;
2130 return perf_evsel__parse_id_sample(evsel, event, data);
2131 }
2132
2133 array = event->sample.array;
2134
2135 if (perf_event__check_size(event, evsel->sample_size))
2136 return -EFAULT;
2137
2138 if (type & PERF_SAMPLE_IDENTIFIER) {
2139 data->id = *array;
2140 array++;
2141 }
2142
2143 if (type & PERF_SAMPLE_IP) {
2144 data->ip = *array;
2145 array++;
2146 }
2147
2148 if (type & PERF_SAMPLE_TID) {
2149 u.val64 = *array;
2150 if (swapped) {
2151 /* undo swap of u64, then swap on individual u32s */
2152 u.val64 = bswap_64(u.val64);
2153 u.val32[0] = bswap_32(u.val32[0]);
2154 u.val32[1] = bswap_32(u.val32[1]);
2155 }
2156
2157 data->pid = u.val32[0];
2158 data->tid = u.val32[1];
2159 array++;
2160 }
2161
2162 if (type & PERF_SAMPLE_TIME) {
2163 data->time = *array;
2164 array++;
2165 }
2166
2167 if (type & PERF_SAMPLE_ADDR) {
2168 data->addr = *array;
2169 array++;
2170 }
2171
2172 if (type & PERF_SAMPLE_ID) {
2173 data->id = *array;
2174 array++;
2175 }
2176
2177 if (type & PERF_SAMPLE_STREAM_ID) {
2178 data->stream_id = *array;
2179 array++;
2180 }
2181
2182 if (type & PERF_SAMPLE_CPU) {
2183
2184 u.val64 = *array;
2185 if (swapped) {
2186 /* undo swap of u64, then swap on individual u32s */
2187 u.val64 = bswap_64(u.val64);
2188 u.val32[0] = bswap_32(u.val32[0]);
2189 }
2190
2191 data->cpu = u.val32[0];
2192 array++;
2193 }
2194
2195 if (type & PERF_SAMPLE_PERIOD) {
2196 data->period = *array;
2197 array++;
2198 }
2199
2200 if (type & PERF_SAMPLE_READ) {
2201 u64 read_format = evsel->attr.read_format;
2202
2203 OVERFLOW_CHECK_u64(array);
2204 if (read_format & PERF_FORMAT_GROUP)
2205 data->read.group.nr = *array;
2206 else
2207 data->read.one.value = *array;
2208
2209 array++;
2210
2211 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2212 OVERFLOW_CHECK_u64(array);
2213 data->read.time_enabled = *array;
2214 array++;
2215 }
2216
2217 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2218 OVERFLOW_CHECK_u64(array);
2219 data->read.time_running = *array;
2220 array++;
2221 }
2222
2223 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2224 if (read_format & PERF_FORMAT_GROUP) {
2225 const u64 max_group_nr = UINT64_MAX /
2226 sizeof(struct sample_read_value);
2227
2228 if (data->read.group.nr > max_group_nr)
2229 return -EFAULT;
2230 sz = data->read.group.nr *
2231 sizeof(struct sample_read_value);
2232 OVERFLOW_CHECK(array, sz, max_size);
2233 data->read.group.values =
2234 (struct sample_read_value *)array;
2235 array = (void *)array + sz;
2236 } else {
2237 OVERFLOW_CHECK_u64(array);
2238 data->read.one.id = *array;
2239 array++;
2240 }
2241 }
2242
2243 if (evsel__has_callchain(evsel)) {
2244 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
2245
2246 OVERFLOW_CHECK_u64(array);
2247 data->callchain = (struct ip_callchain *)array++;
2248 if (data->callchain->nr > max_callchain_nr)
2249 return -EFAULT;
2250 sz = data->callchain->nr * sizeof(u64);
2251 OVERFLOW_CHECK(array, sz, max_size);
2252 array = (void *)array + sz;
2253 }
2254
2255 if (type & PERF_SAMPLE_RAW) {
2256 OVERFLOW_CHECK_u64(array);
2257 u.val64 = *array;
2258
2259 /*
2260 * Undo swap of u64, then swap on individual u32s,
2261 * get the size of the raw area and undo all of the
2262 * swap. The pevent interface handles endianity by
2263 * itself.
2264 */
2265 if (swapped) {
2266 u.val64 = bswap_64(u.val64);
2267 u.val32[0] = bswap_32(u.val32[0]);
2268 u.val32[1] = bswap_32(u.val32[1]);
2269 }
2270 data->raw_size = u.val32[0];
2271
2272 /*
2273 * The raw data is aligned on 64bits including the
2274 * u32 size, so it's safe to use mem_bswap_64.
2275 */
2276 if (swapped)
2277 mem_bswap_64((void *) array, data->raw_size);
2278
2279 array = (void *)array + sizeof(u32);
2280
2281 OVERFLOW_CHECK(array, data->raw_size, max_size);
2282 data->raw_data = (void *)array;
2283 array = (void *)array + data->raw_size;
2284 }
2285
2286 if (type & PERF_SAMPLE_BRANCH_STACK) {
2287 const u64 max_branch_nr = UINT64_MAX /
2288 sizeof(struct branch_entry);
2289
2290 OVERFLOW_CHECK_u64(array);
2291 data->branch_stack = (struct branch_stack *)array++;
2292
2293 if (data->branch_stack->nr > max_branch_nr)
2294 return -EFAULT;
2295 sz = data->branch_stack->nr * sizeof(struct branch_entry);
2296 OVERFLOW_CHECK(array, sz, max_size);
2297 array = (void *)array + sz;
2298 }
2299
2300 if (type & PERF_SAMPLE_REGS_USER) {
2301 OVERFLOW_CHECK_u64(array);
2302 data->user_regs.abi = *array;
2303 array++;
2304
2305 if (data->user_regs.abi) {
2306 u64 mask = evsel->attr.sample_regs_user;
2307
2308 sz = hweight_long(mask) * sizeof(u64);
2309 OVERFLOW_CHECK(array, sz, max_size);
2310 data->user_regs.mask = mask;
2311 data->user_regs.regs = (u64 *)array;
2312 array = (void *)array + sz;
2313 }
2314 }
2315
2316 if (type & PERF_SAMPLE_STACK_USER) {
2317 OVERFLOW_CHECK_u64(array);
2318 sz = *array++;
2319
2320 data->user_stack.offset = ((char *)(array - 1)
2321 - (char *) event);
2322
2323 if (!sz) {
2324 data->user_stack.size = 0;
2325 } else {
2326 OVERFLOW_CHECK(array, sz, max_size);
2327 data->user_stack.data = (char *)array;
2328 array = (void *)array + sz;
2329 OVERFLOW_CHECK_u64(array);
2330 data->user_stack.size = *array++;
2331 if (WARN_ONCE(data->user_stack.size > sz,
2332 "user stack dump failure\n"))
2333 return -EFAULT;
2334 }
2335 }
2336
2337 if (type & PERF_SAMPLE_WEIGHT) {
2338 OVERFLOW_CHECK_u64(array);
2339 data->weight = *array;
2340 array++;
2341 }
2342
2343 if (type & PERF_SAMPLE_DATA_SRC) {
2344 OVERFLOW_CHECK_u64(array);
2345 data->data_src = *array;
2346 array++;
2347 }
2348
2349 if (type & PERF_SAMPLE_TRANSACTION) {
2350 OVERFLOW_CHECK_u64(array);
2351 data->transaction = *array;
2352 array++;
2353 }
2354
2355 data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
2356 if (type & PERF_SAMPLE_REGS_INTR) {
2357 OVERFLOW_CHECK_u64(array);
2358 data->intr_regs.abi = *array;
2359 array++;
2360
2361 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
2362 u64 mask = evsel->attr.sample_regs_intr;
2363
2364 sz = hweight_long(mask) * sizeof(u64);
2365 OVERFLOW_CHECK(array, sz, max_size);
2366 data->intr_regs.mask = mask;
2367 data->intr_regs.regs = (u64 *)array;
2368 array = (void *)array + sz;
2369 }
2370 }
2371
2372 data->phys_addr = 0;
2373 if (type & PERF_SAMPLE_PHYS_ADDR) {
2374 data->phys_addr = *array;
2375 array++;
2376 }
2377
2378 return 0;
2379 }
2380
2381 int perf_evsel__parse_sample_timestamp(struct perf_evsel *evsel,
2382 union perf_event *event,
2383 u64 *timestamp)
2384 {
2385 u64 type = evsel->attr.sample_type;
2386 const u64 *array;
2387
2388 if (!(type & PERF_SAMPLE_TIME))
2389 return -1;
2390
2391 if (event->header.type != PERF_RECORD_SAMPLE) {
2392 struct perf_sample data = {
2393 .time = -1ULL,
2394 };
2395
2396 if (!evsel->attr.sample_id_all)
2397 return -1;
2398 if (perf_evsel__parse_id_sample(evsel, event, &data))
2399 return -1;
2400
2401 *timestamp = data.time;
2402 return 0;
2403 }
2404
2405 array = event->sample.array;
2406
2407 if (perf_event__check_size(event, evsel->sample_size))
2408 return -EFAULT;
2409
2410 if (type & PERF_SAMPLE_IDENTIFIER)
2411 array++;
2412
2413 if (type & PERF_SAMPLE_IP)
2414 array++;
2415
2416 if (type & PERF_SAMPLE_TID)
2417 array++;
2418
2419 if (type & PERF_SAMPLE_TIME)
2420 *timestamp = *array;
2421
2422 return 0;
2423 }
2424
2425 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
2426 u64 read_format)
2427 {
2428 size_t sz, result = sizeof(struct sample_event);
2429
2430 if (type & PERF_SAMPLE_IDENTIFIER)
2431 result += sizeof(u64);
2432
2433 if (type & PERF_SAMPLE_IP)
2434 result += sizeof(u64);
2435
2436 if (type & PERF_SAMPLE_TID)
2437 result += sizeof(u64);
2438
2439 if (type & PERF_SAMPLE_TIME)
2440 result += sizeof(u64);
2441
2442 if (type & PERF_SAMPLE_ADDR)
2443 result += sizeof(u64);
2444
2445 if (type & PERF_SAMPLE_ID)
2446 result += sizeof(u64);
2447
2448 if (type & PERF_SAMPLE_STREAM_ID)
2449 result += sizeof(u64);
2450
2451 if (type & PERF_SAMPLE_CPU)
2452 result += sizeof(u64);
2453
2454 if (type & PERF_SAMPLE_PERIOD)
2455 result += sizeof(u64);
2456
2457 if (type & PERF_SAMPLE_READ) {
2458 result += sizeof(u64);
2459 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
2460 result += sizeof(u64);
2461 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
2462 result += sizeof(u64);
2463 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2464 if (read_format & PERF_FORMAT_GROUP) {
2465 sz = sample->read.group.nr *
2466 sizeof(struct sample_read_value);
2467 result += sz;
2468 } else {
2469 result += sizeof(u64);
2470 }
2471 }
2472
2473 if (type & PERF_SAMPLE_CALLCHAIN) {
2474 sz = (sample->callchain->nr + 1) * sizeof(u64);
2475 result += sz;
2476 }
2477
2478 if (type & PERF_SAMPLE_RAW) {
2479 result += sizeof(u32);
2480 result += sample->raw_size;
2481 }
2482
2483 if (type & PERF_SAMPLE_BRANCH_STACK) {
2484 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2485 sz += sizeof(u64);
2486 result += sz;
2487 }
2488
2489 if (type & PERF_SAMPLE_REGS_USER) {
2490 if (sample->user_regs.abi) {
2491 result += sizeof(u64);
2492 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2493 result += sz;
2494 } else {
2495 result += sizeof(u64);
2496 }
2497 }
2498
2499 if (type & PERF_SAMPLE_STACK_USER) {
2500 sz = sample->user_stack.size;
2501 result += sizeof(u64);
2502 if (sz) {
2503 result += sz;
2504 result += sizeof(u64);
2505 }
2506 }
2507
2508 if (type & PERF_SAMPLE_WEIGHT)
2509 result += sizeof(u64);
2510
2511 if (type & PERF_SAMPLE_DATA_SRC)
2512 result += sizeof(u64);
2513
2514 if (type & PERF_SAMPLE_TRANSACTION)
2515 result += sizeof(u64);
2516
2517 if (type & PERF_SAMPLE_REGS_INTR) {
2518 if (sample->intr_regs.abi) {
2519 result += sizeof(u64);
2520 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
2521 result += sz;
2522 } else {
2523 result += sizeof(u64);
2524 }
2525 }
2526
2527 if (type & PERF_SAMPLE_PHYS_ADDR)
2528 result += sizeof(u64);
2529
2530 return result;
2531 }
2532
2533 int perf_event__synthesize_sample(union perf_event *event, u64 type,
2534 u64 read_format,
2535 const struct perf_sample *sample)
2536 {
2537 u64 *array;
2538 size_t sz;
2539 /*
2540 * used for cross-endian analysis. See git commit 65014ab3
2541 * for why this goofiness is needed.
2542 */
2543 union u64_swap u;
2544
2545 array = event->sample.array;
2546
2547 if (type & PERF_SAMPLE_IDENTIFIER) {
2548 *array = sample->id;
2549 array++;
2550 }
2551
2552 if (type & PERF_SAMPLE_IP) {
2553 *array = sample->ip;
2554 array++;
2555 }
2556
2557 if (type & PERF_SAMPLE_TID) {
2558 u.val32[0] = sample->pid;
2559 u.val32[1] = sample->tid;
2560 *array = u.val64;
2561 array++;
2562 }
2563
2564 if (type & PERF_SAMPLE_TIME) {
2565 *array = sample->time;
2566 array++;
2567 }
2568
2569 if (type & PERF_SAMPLE_ADDR) {
2570 *array = sample->addr;
2571 array++;
2572 }
2573
2574 if (type & PERF_SAMPLE_ID) {
2575 *array = sample->id;
2576 array++;
2577 }
2578
2579 if (type & PERF_SAMPLE_STREAM_ID) {
2580 *array = sample->stream_id;
2581 array++;
2582 }
2583
2584 if (type & PERF_SAMPLE_CPU) {
2585 u.val32[0] = sample->cpu;
2586 u.val32[1] = 0;
2587 *array = u.val64;
2588 array++;
2589 }
2590
2591 if (type & PERF_SAMPLE_PERIOD) {
2592 *array = sample->period;
2593 array++;
2594 }
2595
2596 if (type & PERF_SAMPLE_READ) {
2597 if (read_format & PERF_FORMAT_GROUP)
2598 *array = sample->read.group.nr;
2599 else
2600 *array = sample->read.one.value;
2601 array++;
2602
2603 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2604 *array = sample->read.time_enabled;
2605 array++;
2606 }
2607
2608 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2609 *array = sample->read.time_running;
2610 array++;
2611 }
2612
2613 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2614 if (read_format & PERF_FORMAT_GROUP) {
2615 sz = sample->read.group.nr *
2616 sizeof(struct sample_read_value);
2617 memcpy(array, sample->read.group.values, sz);
2618 array = (void *)array + sz;
2619 } else {
2620 *array = sample->read.one.id;
2621 array++;
2622 }
2623 }
2624
2625 if (type & PERF_SAMPLE_CALLCHAIN) {
2626 sz = (sample->callchain->nr + 1) * sizeof(u64);
2627 memcpy(array, sample->callchain, sz);
2628 array = (void *)array + sz;
2629 }
2630
2631 if (type & PERF_SAMPLE_RAW) {
2632 u.val32[0] = sample->raw_size;
2633 *array = u.val64;
2634 array = (void *)array + sizeof(u32);
2635
2636 memcpy(array, sample->raw_data, sample->raw_size);
2637 array = (void *)array + sample->raw_size;
2638 }
2639
2640 if (type & PERF_SAMPLE_BRANCH_STACK) {
2641 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2642 sz += sizeof(u64);
2643 memcpy(array, sample->branch_stack, sz);
2644 array = (void *)array + sz;
2645 }
2646
2647 if (type & PERF_SAMPLE_REGS_USER) {
2648 if (sample->user_regs.abi) {
2649 *array++ = sample->user_regs.abi;
2650 sz = hweight_long(sample->user_regs.mask) * sizeof(u64);
2651 memcpy(array, sample->user_regs.regs, sz);
2652 array = (void *)array + sz;
2653 } else {
2654 *array++ = 0;
2655 }
2656 }
2657
2658 if (type & PERF_SAMPLE_STACK_USER) {
2659 sz = sample->user_stack.size;
2660 *array++ = sz;
2661 if (sz) {
2662 memcpy(array, sample->user_stack.data, sz);
2663 array = (void *)array + sz;
2664 *array++ = sz;
2665 }
2666 }
2667
2668 if (type & PERF_SAMPLE_WEIGHT) {
2669 *array = sample->weight;
2670 array++;
2671 }
2672
2673 if (type & PERF_SAMPLE_DATA_SRC) {
2674 *array = sample->data_src;
2675 array++;
2676 }
2677
2678 if (type & PERF_SAMPLE_TRANSACTION) {
2679 *array = sample->transaction;
2680 array++;
2681 }
2682
2683 if (type & PERF_SAMPLE_REGS_INTR) {
2684 if (sample->intr_regs.abi) {
2685 *array++ = sample->intr_regs.abi;
2686 sz = hweight_long(sample->intr_regs.mask) * sizeof(u64);
2687 memcpy(array, sample->intr_regs.regs, sz);
2688 array = (void *)array + sz;
2689 } else {
2690 *array++ = 0;
2691 }
2692 }
2693
2694 if (type & PERF_SAMPLE_PHYS_ADDR) {
2695 *array = sample->phys_addr;
2696 array++;
2697 }
2698
2699 return 0;
2700 }
2701
2702 struct tep_format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
2703 {
2704 return tep_find_field(evsel->tp_format, name);
2705 }
2706
2707 void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
2708 const char *name)
2709 {
2710 struct tep_format_field *field = perf_evsel__field(evsel, name);
2711 int offset;
2712
2713 if (!field)
2714 return NULL;
2715
2716 offset = field->offset;
2717
2718 if (field->flags & TEP_FIELD_IS_DYNAMIC) {
2719 offset = *(int *)(sample->raw_data + field->offset);
2720 offset &= 0xffff;
2721 }
2722
2723 return sample->raw_data + offset;
2724 }
2725
2726 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample,
2727 bool needs_swap)
2728 {
2729 u64 value;
2730 void *ptr = sample->raw_data + field->offset;
2731
2732 switch (field->size) {
2733 case 1:
2734 return *(u8 *)ptr;
2735 case 2:
2736 value = *(u16 *)ptr;
2737 break;
2738 case 4:
2739 value = *(u32 *)ptr;
2740 break;
2741 case 8:
2742 memcpy(&value, ptr, sizeof(u64));
2743 break;
2744 default:
2745 return 0;
2746 }
2747
2748 if (!needs_swap)
2749 return value;
2750
2751 switch (field->size) {
2752 case 2:
2753 return bswap_16(value);
2754 case 4:
2755 return bswap_32(value);
2756 case 8:
2757 return bswap_64(value);
2758 default:
2759 return 0;
2760 }
2761
2762 return 0;
2763 }
2764
2765 u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
2766 const char *name)
2767 {
2768 struct tep_format_field *field = perf_evsel__field(evsel, name);
2769
2770 if (!field)
2771 return 0;
2772
2773 return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2774 }
2775
2776 bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
2777 char *msg, size_t msgsize)
2778 {
2779 int paranoid;
2780
2781 if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2782 evsel->attr.type == PERF_TYPE_HARDWARE &&
2783 evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2784 /*
2785 * If it's cycles then fall back to hrtimer based
2786 * cpu-clock-tick sw counter, which is always available even if
2787 * no PMU support.
2788 *
2789 * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2790 * b0a873e).
2791 */
2792 scnprintf(msg, msgsize, "%s",
2793 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2794
2795 evsel->attr.type = PERF_TYPE_SOFTWARE;
2796 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
2797
2798 zfree(&evsel->name);
2799 return true;
2800 } else if (err == EACCES && !evsel->attr.exclude_kernel &&
2801 (paranoid = perf_event_paranoid()) > 1) {
2802 const char *name = perf_evsel__name(evsel);
2803 char *new_name;
2804 const char *sep = ":";
2805
2806 /* Is there already the separator in the name. */
2807 if (strchr(name, '/') ||
2808 strchr(name, ':'))
2809 sep = "";
2810
2811 if (asprintf(&new_name, "%s%su", name, sep) < 0)
2812 return false;
2813
2814 if (evsel->name)
2815 free(evsel->name);
2816 evsel->name = new_name;
2817 scnprintf(msg, msgsize,
2818 "kernel.perf_event_paranoid=%d, trying to fall back to excluding kernel samples", paranoid);
2819 evsel->attr.exclude_kernel = 1;
2820
2821 return true;
2822 }
2823
2824 return false;
2825 }
2826
2827 static bool find_process(const char *name)
2828 {
2829 size_t len = strlen(name);
2830 DIR *dir;
2831 struct dirent *d;
2832 int ret = -1;
2833
2834 dir = opendir(procfs__mountpoint());
2835 if (!dir)
2836 return false;
2837
2838 /* Walk through the directory. */
2839 while (ret && (d = readdir(dir)) != NULL) {
2840 char path[PATH_MAX];
2841 char *data;
2842 size_t size;
2843
2844 if ((d->d_type != DT_DIR) ||
2845 !strcmp(".", d->d_name) ||
2846 !strcmp("..", d->d_name))
2847 continue;
2848
2849 scnprintf(path, sizeof(path), "%s/%s/comm",
2850 procfs__mountpoint(), d->d_name);
2851
2852 if (filename__read_str(path, &data, &size))
2853 continue;
2854
2855 ret = strncmp(name, data, len);
2856 free(data);
2857 }
2858
2859 closedir(dir);
2860 return ret ? false : true;
2861 }
2862
2863 int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
2864 int err, char *msg, size_t size)
2865 {
2866 char sbuf[STRERR_BUFSIZE];
2867 int printed = 0;
2868
2869 switch (err) {
2870 case EPERM:
2871 case EACCES:
2872 if (err == EPERM)
2873 printed = scnprintf(msg, size,
2874 "No permission to enable %s event.\n\n",
2875 perf_evsel__name(evsel));
2876
2877 return scnprintf(msg + printed, size - printed,
2878 "You may not have permission to collect %sstats.\n\n"
2879 "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
2880 "which controls use of the performance events system by\n"
2881 "unprivileged users (without CAP_SYS_ADMIN).\n\n"
2882 "The current value is %d:\n\n"
2883 " -1: Allow use of (almost) all events by all users\n"
2884 " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
2885 ">= 0: Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN\n"
2886 " Disallow raw tracepoint access by users without CAP_SYS_ADMIN\n"
2887 ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
2888 ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN\n\n"
2889 "To make this setting permanent, edit /etc/sysctl.conf too, e.g.:\n\n"
2890 " kernel.perf_event_paranoid = -1\n" ,
2891 target->system_wide ? "system-wide " : "",
2892 perf_event_paranoid());
2893 case ENOENT:
2894 return scnprintf(msg, size, "The %s event is not supported.",
2895 perf_evsel__name(evsel));
2896 case EMFILE:
2897 return scnprintf(msg, size, "%s",
2898 "Too many events are opened.\n"
2899 "Probably the maximum number of open file descriptors has been reached.\n"
2900 "Hint: Try again after reducing the number of events.\n"
2901 "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2902 case ENOMEM:
2903 if (evsel__has_callchain(evsel) &&
2904 access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
2905 return scnprintf(msg, size,
2906 "Not enough memory to setup event with callchain.\n"
2907 "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
2908 "Hint: Current value: %d", sysctl__max_stack());
2909 break;
2910 case ENODEV:
2911 if (target->cpu_list)
2912 return scnprintf(msg, size, "%s",
2913 "No such device - did you specify an out-of-range profile CPU?");
2914 break;
2915 case EOPNOTSUPP:
2916 if (evsel->attr.sample_period != 0)
2917 return scnprintf(msg, size,
2918 "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
2919 perf_evsel__name(evsel));
2920 if (evsel->attr.precise_ip)
2921 return scnprintf(msg, size, "%s",
2922 "\'precise\' request may not be supported. Try removing 'p' modifier.");
2923 #if defined(__i386__) || defined(__x86_64__)
2924 if (evsel->attr.type == PERF_TYPE_HARDWARE)
2925 return scnprintf(msg, size, "%s",
2926 "No hardware sampling interrupt available.\n");
2927 #endif
2928 break;
2929 case EBUSY:
2930 if (find_process("oprofiled"))
2931 return scnprintf(msg, size,
2932 "The PMU counters are busy/taken by another profiler.\n"
2933 "We found oprofile daemon running, please stop it and try again.");
2934 break;
2935 case EINVAL:
2936 if (evsel->attr.write_backward && perf_missing_features.write_backward)
2937 return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
2938 if (perf_missing_features.clockid)
2939 return scnprintf(msg, size, "clockid feature not supported.");
2940 if (perf_missing_features.clockid_wrong)
2941 return scnprintf(msg, size, "wrong clockid (%d).", clockid);
2942 break;
2943 default:
2944 break;
2945 }
2946
2947 return scnprintf(msg, size,
2948 "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
2949 "/bin/dmesg | grep -i perf may provide additional information.\n",
2950 err, str_error_r(err, sbuf, sizeof(sbuf)),
2951 perf_evsel__name(evsel));
2952 }
2953
2954 struct perf_env *perf_evsel__env(struct perf_evsel *evsel)
2955 {
2956 if (evsel && evsel->evlist)
2957 return evsel->evlist->env;
2958 return NULL;
2959 }
2960
2961 static int store_evsel_ids(struct perf_evsel *evsel, struct perf_evlist *evlist)
2962 {
2963 int cpu, thread;
2964
2965 for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++) {
2966 for (thread = 0; thread < xyarray__max_y(evsel->fd);
2967 thread++) {
2968 int fd = FD(evsel, cpu, thread);
2969
2970 if (perf_evlist__id_add_fd(evlist, evsel,
2971 cpu, thread, fd) < 0)
2972 return -1;
2973 }
2974 }
2975
2976 return 0;
2977 }
2978
2979 int perf_evsel__store_ids(struct perf_evsel *evsel, struct perf_evlist *evlist)
2980 {
2981 struct cpu_map *cpus = evsel->cpus;
2982 struct thread_map *threads = evsel->threads;
2983
2984 if (perf_evsel__alloc_id(evsel, cpus->nr, threads->nr))
2985 return -ENOMEM;
2986
2987 return store_evsel_ids(evsel, evlist);
2988 }
Linux with added FPC-III support