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Linux/tools/perf/util/evsel.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright (C) 2011, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
  4  *
  5  * Parts came from builtin-{top,stat,record}.c, see those files for further
  6  * copyright notes.
  7  */
  8 
  9 #include <byteswap.h>
 10 #include <errno.h>
 11 #include <inttypes.h>
 12 #include <linux/bitops.h>
 13 #include <api/fs/fs.h>
 14 #include <api/fs/tracing_path.h>
 15 #include <traceevent/event-parse.h>
 16 #include <linux/hw_breakpoint.h>
 17 #include <linux/perf_event.h>
 18 #include <linux/compiler.h>
 19 #include <linux/err.h>
 20 #include <linux/zalloc.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 "cpumap.h"
 32 #include "thread_map.h"
 33 #include "target.h"
 34 #include "perf_regs.h"
 35 #include "debug.h"
 36 #include "trace-event.h"
 37 #include "stat.h"
 38 #include "string2.h"
 39 #include "memswap.h"
 40 #include "util/parse-branch-options.h"
 41 
 42 #include <linux/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         /*
299          * Now let the usual logic to set up the perf_event_attr defaults
300          * to kick in when we return and before perf_evsel__open() is called.
301          */
302 new_event:
303         evsel = perf_evsel__new(&attr);
304         if (evsel == NULL)
305                 goto out;
306 
307         evsel->precise_max = true;
308 
309         /* use asprintf() because free(evsel) assumes name is allocated */
310         if (asprintf(&evsel->name, "cycles%s%s%.*s",
311                      (attr.precise_ip || attr.exclude_kernel) ? ":" : "",
312                      attr.exclude_kernel ? "u" : "",
313                      attr.precise_ip ? attr.precise_ip + 1 : 0, "ppp") < 0)
314                 goto error_free;
315 out:
316         return evsel;
317 error_free:
318         perf_evsel__delete(evsel);
319         evsel = NULL;
320         goto out;
321 }
322 
323 /*
324  * Returns pointer with encoded error via <linux/err.h> interface.
325  */
326 struct perf_evsel *perf_evsel__newtp_idx(const char *sys, const char *name, int idx)
327 {
328         struct perf_evsel *evsel = zalloc(perf_evsel__object.size);
329         int err = -ENOMEM;
330 
331         if (evsel == NULL) {
332                 goto out_err;
333         } else {
334                 struct perf_event_attr attr = {
335                         .type          = PERF_TYPE_TRACEPOINT,
336                         .sample_type   = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME |
337                                           PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD),
338                 };
339 
340                 if (asprintf(&evsel->name, "%s:%s", sys, name) < 0)
341                         goto out_free;
342 
343                 evsel->tp_format = trace_event__tp_format(sys, name);
344                 if (IS_ERR(evsel->tp_format)) {
345                         err = PTR_ERR(evsel->tp_format);
346                         goto out_free;
347                 }
348 
349                 event_attr_init(&attr);
350                 attr.config = evsel->tp_format->id;
351                 attr.sample_period = 1;
352                 perf_evsel__init(evsel, &attr, idx);
353         }
354 
355         return evsel;
356 
357 out_free:
358         zfree(&evsel->name);
359         free(evsel);
360 out_err:
361         return ERR_PTR(err);
362 }
363 
364 const char *perf_evsel__hw_names[PERF_COUNT_HW_MAX] = {
365         "cycles",
366         "instructions",
367         "cache-references",
368         "cache-misses",
369         "branches",
370         "branch-misses",
371         "bus-cycles",
372         "stalled-cycles-frontend",
373         "stalled-cycles-backend",
374         "ref-cycles",
375 };
376 
377 static const char *__perf_evsel__hw_name(u64 config)
378 {
379         if (config < PERF_COUNT_HW_MAX && perf_evsel__hw_names[config])
380                 return perf_evsel__hw_names[config];
381 
382         return "unknown-hardware";
383 }
384 
385 static int perf_evsel__add_modifiers(struct perf_evsel *evsel, char *bf, size_t size)
386 {
387         int colon = 0, r = 0;
388         struct perf_event_attr *attr = &evsel->attr;
389         bool exclude_guest_default = false;
390 
391 #define MOD_PRINT(context, mod) do {                                    \
392                 if (!attr->exclude_##context) {                         \
393                         if (!colon) colon = ++r;                        \
394                         r += scnprintf(bf + r, size - r, "%c", mod);    \
395                 } } while(0)
396 
397         if (attr->exclude_kernel || attr->exclude_user || attr->exclude_hv) {
398                 MOD_PRINT(kernel, 'k');
399                 MOD_PRINT(user, 'u');
400                 MOD_PRINT(hv, 'h');
401                 exclude_guest_default = true;
402         }
403 
404         if (attr->precise_ip) {
405                 if (!colon)
406                         colon = ++r;
407                 r += scnprintf(bf + r, size - r, "%.*s", attr->precise_ip, "ppp");
408                 exclude_guest_default = true;
409         }
410 
411         if (attr->exclude_host || attr->exclude_guest == exclude_guest_default) {
412                 MOD_PRINT(host, 'H');
413                 MOD_PRINT(guest, 'G');
414         }
415 #undef MOD_PRINT
416         if (colon)
417                 bf[colon - 1] = ':';
418         return r;
419 }
420 
421 static int perf_evsel__hw_name(struct perf_evsel *evsel, char *bf, size_t size)
422 {
423         int r = scnprintf(bf, size, "%s", __perf_evsel__hw_name(evsel->attr.config));
424         return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
425 }
426 
427 const char *perf_evsel__sw_names[PERF_COUNT_SW_MAX] = {
428         "cpu-clock",
429         "task-clock",
430         "page-faults",
431         "context-switches",
432         "cpu-migrations",
433         "minor-faults",
434         "major-faults",
435         "alignment-faults",
436         "emulation-faults",
437         "dummy",
438 };
439 
440 static const char *__perf_evsel__sw_name(u64 config)
441 {
442         if (config < PERF_COUNT_SW_MAX && perf_evsel__sw_names[config])
443                 return perf_evsel__sw_names[config];
444         return "unknown-software";
445 }
446 
447 static int perf_evsel__sw_name(struct perf_evsel *evsel, char *bf, size_t size)
448 {
449         int r = scnprintf(bf, size, "%s", __perf_evsel__sw_name(evsel->attr.config));
450         return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
451 }
452 
453 static int __perf_evsel__bp_name(char *bf, size_t size, u64 addr, u64 type)
454 {
455         int r;
456 
457         r = scnprintf(bf, size, "mem:0x%" PRIx64 ":", addr);
458 
459         if (type & HW_BREAKPOINT_R)
460                 r += scnprintf(bf + r, size - r, "r");
461 
462         if (type & HW_BREAKPOINT_W)
463                 r += scnprintf(bf + r, size - r, "w");
464 
465         if (type & HW_BREAKPOINT_X)
466                 r += scnprintf(bf + r, size - r, "x");
467 
468         return r;
469 }
470 
471 static int perf_evsel__bp_name(struct perf_evsel *evsel, char *bf, size_t size)
472 {
473         struct perf_event_attr *attr = &evsel->attr;
474         int r = __perf_evsel__bp_name(bf, size, attr->bp_addr, attr->bp_type);
475         return r + perf_evsel__add_modifiers(evsel, bf + r, size - r);
476 }
477 
478 const char *perf_evsel__hw_cache[PERF_COUNT_HW_CACHE_MAX]
479                                 [PERF_EVSEL__MAX_ALIASES] = {
480  { "L1-dcache", "l1-d",         "l1d",          "L1-data",              },
481  { "L1-icache", "l1-i",         "l1i",          "L1-instruction",       },
482  { "LLC",       "L2",                                                   },
483  { "dTLB",      "d-tlb",        "Data-TLB",                             },
484  { "iTLB",      "i-tlb",        "Instruction-TLB",                      },
485  { "branch",    "branches",     "bpu",          "btb",          "bpc",  },
486  { "node",                                                              },
487 };
488 
489 const char *perf_evsel__hw_cache_op[PERF_COUNT_HW_CACHE_OP_MAX]
490                                    [PERF_EVSEL__MAX_ALIASES] = {
491  { "load",      "loads",        "read",                                 },
492  { "store",     "stores",       "write",                                },
493  { "prefetch",  "prefetches",   "speculative-read", "speculative-load", },
494 };
495 
496 const char *perf_evsel__hw_cache_result[PERF_COUNT_HW_CACHE_RESULT_MAX]
497                                        [PERF_EVSEL__MAX_ALIASES] = {
498  { "refs",      "Reference",    "ops",          "access",               },
499  { "misses",    "miss",                                                 },
500 };
501 
502 #define C(x)            PERF_COUNT_HW_CACHE_##x
503 #define CACHE_READ      (1 << C(OP_READ))
504 #define CACHE_WRITE     (1 << C(OP_WRITE))
505 #define CACHE_PREFETCH  (1 << C(OP_PREFETCH))
506 #define COP(x)          (1 << x)
507 
508 /*
509  * cache operartion stat
510  * L1I : Read and prefetch only
511  * ITLB and BPU : Read-only
512  */
513 static unsigned long perf_evsel__hw_cache_stat[C(MAX)] = {
514  [C(L1D)]       = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
515  [C(L1I)]       = (CACHE_READ | CACHE_PREFETCH),
516  [C(LL)]        = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
517  [C(DTLB)]      = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
518  [C(ITLB)]      = (CACHE_READ),
519  [C(BPU)]       = (CACHE_READ),
520  [C(NODE)]      = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
521 };
522 
523 bool perf_evsel__is_cache_op_valid(u8 type, u8 op)
524 {
525         if (perf_evsel__hw_cache_stat[type] & COP(op))
526                 return true;    /* valid */
527         else
528                 return false;   /* invalid */
529 }
530 
531 int __perf_evsel__hw_cache_type_op_res_name(u8 type, u8 op, u8 result,
532                                             char *bf, size_t size)
533 {
534         if (result) {
535                 return scnprintf(bf, size, "%s-%s-%s", perf_evsel__hw_cache[type][0],
536                                  perf_evsel__hw_cache_op[op][0],
537                                  perf_evsel__hw_cache_result[result][0]);
538         }
539 
540         return scnprintf(bf, size, "%s-%s", perf_evsel__hw_cache[type][0],
541                          perf_evsel__hw_cache_op[op][1]);
542 }
543 
544 static int __perf_evsel__hw_cache_name(u64 config, char *bf, size_t size)
545 {
546         u8 op, result, type = (config >>  0) & 0xff;
547         const char *err = "unknown-ext-hardware-cache-type";
548 
549         if (type >= PERF_COUNT_HW_CACHE_MAX)
550                 goto out_err;
551 
552         op = (config >>  8) & 0xff;
553         err = "unknown-ext-hardware-cache-op";
554         if (op >= PERF_COUNT_HW_CACHE_OP_MAX)
555                 goto out_err;
556 
557         result = (config >> 16) & 0xff;
558         err = "unknown-ext-hardware-cache-result";
559         if (result >= PERF_COUNT_HW_CACHE_RESULT_MAX)
560                 goto out_err;
561 
562         err = "invalid-cache";
563         if (!perf_evsel__is_cache_op_valid(type, op))
564                 goto out_err;
565 
566         return __perf_evsel__hw_cache_type_op_res_name(type, op, result, bf, size);
567 out_err:
568         return scnprintf(bf, size, "%s", err);
569 }
570 
571 static int perf_evsel__hw_cache_name(struct perf_evsel *evsel, char *bf, size_t size)
572 {
573         int ret = __perf_evsel__hw_cache_name(evsel->attr.config, bf, size);
574         return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
575 }
576 
577 static int perf_evsel__raw_name(struct perf_evsel *evsel, char *bf, size_t size)
578 {
579         int ret = scnprintf(bf, size, "raw 0x%" PRIx64, evsel->attr.config);
580         return ret + perf_evsel__add_modifiers(evsel, bf + ret, size - ret);
581 }
582 
583 static int perf_evsel__tool_name(char *bf, size_t size)
584 {
585         int ret = scnprintf(bf, size, "duration_time");
586         return ret;
587 }
588 
589 const char *perf_evsel__name(struct perf_evsel *evsel)
590 {
591         char bf[128];
592 
593         if (!evsel)
594                 goto out_unknown;
595 
596         if (evsel->name)
597                 return evsel->name;
598 
599         switch (evsel->attr.type) {
600         case PERF_TYPE_RAW:
601                 perf_evsel__raw_name(evsel, bf, sizeof(bf));
602                 break;
603 
604         case PERF_TYPE_HARDWARE:
605                 perf_evsel__hw_name(evsel, bf, sizeof(bf));
606                 break;
607 
608         case PERF_TYPE_HW_CACHE:
609                 perf_evsel__hw_cache_name(evsel, bf, sizeof(bf));
610                 break;
611 
612         case PERF_TYPE_SOFTWARE:
613                 if (evsel->tool_event)
614                         perf_evsel__tool_name(bf, sizeof(bf));
615                 else
616                         perf_evsel__sw_name(evsel, bf, sizeof(bf));
617                 break;
618 
619         case PERF_TYPE_TRACEPOINT:
620                 scnprintf(bf, sizeof(bf), "%s", "unknown tracepoint");
621                 break;
622 
623         case PERF_TYPE_BREAKPOINT:
624                 perf_evsel__bp_name(evsel, bf, sizeof(bf));
625                 break;
626 
627         default:
628                 scnprintf(bf, sizeof(bf), "unknown attr type: %d",
629                           evsel->attr.type);
630                 break;
631         }
632 
633         evsel->name = strdup(bf);
634 
635         if (evsel->name)
636                 return evsel->name;
637 out_unknown:
638         return "unknown";
639 }
640 
641 const char *perf_evsel__group_name(struct perf_evsel *evsel)
642 {
643         return evsel->group_name ?: "anon group";
644 }
645 
646 /*
647  * Returns the group details for the specified leader,
648  * with following rules.
649  *
650  *  For record -e '{cycles,instructions}'
651  *    'anon group { cycles:u, instructions:u }'
652  *
653  *  For record -e 'cycles,instructions' and report --group
654  *    'cycles:u, instructions:u'
655  */
656 int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
657 {
658         int ret = 0;
659         struct perf_evsel *pos;
660         const char *group_name = perf_evsel__group_name(evsel);
661 
662         if (!evsel->forced_leader)
663                 ret = scnprintf(buf, size, "%s { ", group_name);
664 
665         ret += scnprintf(buf + ret, size - ret, "%s",
666                          perf_evsel__name(evsel));
667 
668         for_each_group_member(pos, evsel)
669                 ret += scnprintf(buf + ret, size - ret, ", %s",
670                                  perf_evsel__name(pos));
671 
672         if (!evsel->forced_leader)
673                 ret += scnprintf(buf + ret, size - ret, " }");
674 
675         return ret;
676 }
677 
678 static void __perf_evsel__config_callchain(struct perf_evsel *evsel,
679                                            struct record_opts *opts,
680                                            struct callchain_param *param)
681 {
682         bool function = perf_evsel__is_function_event(evsel);
683         struct perf_event_attr *attr = &evsel->attr;
684 
685         perf_evsel__set_sample_bit(evsel, CALLCHAIN);
686 
687         attr->sample_max_stack = param->max_stack;
688 
689         if (opts->kernel_callchains)
690                 attr->exclude_callchain_user = 1;
691         if (opts->user_callchains)
692                 attr->exclude_callchain_kernel = 1;
693         if (param->record_mode == CALLCHAIN_LBR) {
694                 if (!opts->branch_stack) {
695                         if (attr->exclude_user) {
696                                 pr_warning("LBR callstack option is only available "
697                                            "to get user callchain information. "
698                                            "Falling back to framepointers.\n");
699                         } else {
700                                 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
701                                 attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
702                                                         PERF_SAMPLE_BRANCH_CALL_STACK |
703                                                         PERF_SAMPLE_BRANCH_NO_CYCLES |
704                                                         PERF_SAMPLE_BRANCH_NO_FLAGS;
705                         }
706                 } else
707                          pr_warning("Cannot use LBR callstack with branch stack. "
708                                     "Falling back to framepointers.\n");
709         }
710 
711         if (param->record_mode == CALLCHAIN_DWARF) {
712                 if (!function) {
713                         perf_evsel__set_sample_bit(evsel, REGS_USER);
714                         perf_evsel__set_sample_bit(evsel, STACK_USER);
715                         if (opts->sample_user_regs && DWARF_MINIMAL_REGS != PERF_REGS_MASK) {
716                                 attr->sample_regs_user |= DWARF_MINIMAL_REGS;
717                                 pr_warning("WARNING: The use of --call-graph=dwarf may require all the user registers, "
718                                            "specifying a subset with --user-regs may render DWARF unwinding unreliable, "
719                                            "so the minimal registers set (IP, SP) is explicitly forced.\n");
720                         } else {
721                                 attr->sample_regs_user |= PERF_REGS_MASK;
722                         }
723                         attr->sample_stack_user = param->dump_size;
724                         attr->exclude_callchain_user = 1;
725                 } else {
726                         pr_info("Cannot use DWARF unwind for function trace event,"
727                                 " falling back to framepointers.\n");
728                 }
729         }
730 
731         if (function) {
732                 pr_info("Disabling user space callchains for function trace event.\n");
733                 attr->exclude_callchain_user = 1;
734         }
735 }
736 
737 void perf_evsel__config_callchain(struct perf_evsel *evsel,
738                                   struct record_opts *opts,
739                                   struct callchain_param *param)
740 {
741         if (param->enabled)
742                 return __perf_evsel__config_callchain(evsel, opts, param);
743 }
744 
745 static void
746 perf_evsel__reset_callgraph(struct perf_evsel *evsel,
747                             struct callchain_param *param)
748 {
749         struct perf_event_attr *attr = &evsel->attr;
750 
751         perf_evsel__reset_sample_bit(evsel, CALLCHAIN);
752         if (param->record_mode == CALLCHAIN_LBR) {
753                 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
754                 attr->branch_sample_type &= ~(PERF_SAMPLE_BRANCH_USER |
755                                               PERF_SAMPLE_BRANCH_CALL_STACK);
756         }
757         if (param->record_mode == CALLCHAIN_DWARF) {
758                 perf_evsel__reset_sample_bit(evsel, REGS_USER);
759                 perf_evsel__reset_sample_bit(evsel, STACK_USER);
760         }
761 }
762 
763 static void apply_config_terms(struct perf_evsel *evsel,
764                                struct record_opts *opts, bool track)
765 {
766         struct perf_evsel_config_term *term;
767         struct list_head *config_terms = &evsel->config_terms;
768         struct perf_event_attr *attr = &evsel->attr;
769         /* callgraph default */
770         struct callchain_param param = {
771                 .record_mode = callchain_param.record_mode,
772         };
773         u32 dump_size = 0;
774         int max_stack = 0;
775         const char *callgraph_buf = NULL;
776 
777         list_for_each_entry(term, config_terms, list) {
778                 switch (term->type) {
779                 case PERF_EVSEL__CONFIG_TERM_PERIOD:
780                         if (!(term->weak && opts->user_interval != ULLONG_MAX)) {
781                                 attr->sample_period = term->val.period;
782                                 attr->freq = 0;
783                                 perf_evsel__reset_sample_bit(evsel, PERIOD);
784                         }
785                         break;
786                 case PERF_EVSEL__CONFIG_TERM_FREQ:
787                         if (!(term->weak && opts->user_freq != UINT_MAX)) {
788                                 attr->sample_freq = term->val.freq;
789                                 attr->freq = 1;
790                                 perf_evsel__set_sample_bit(evsel, PERIOD);
791                         }
792                         break;
793                 case PERF_EVSEL__CONFIG_TERM_TIME:
794                         if (term->val.time)
795                                 perf_evsel__set_sample_bit(evsel, TIME);
796                         else
797                                 perf_evsel__reset_sample_bit(evsel, TIME);
798                         break;
799                 case PERF_EVSEL__CONFIG_TERM_CALLGRAPH:
800                         callgraph_buf = term->val.callgraph;
801                         break;
802                 case PERF_EVSEL__CONFIG_TERM_BRANCH:
803                         if (term->val.branch && strcmp(term->val.branch, "no")) {
804                                 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
805                                 parse_branch_str(term->val.branch,
806                                                  &attr->branch_sample_type);
807                         } else
808                                 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
809                         break;
810                 case PERF_EVSEL__CONFIG_TERM_STACK_USER:
811                         dump_size = term->val.stack_user;
812                         break;
813                 case PERF_EVSEL__CONFIG_TERM_MAX_STACK:
814                         max_stack = term->val.max_stack;
815                         break;
816                 case PERF_EVSEL__CONFIG_TERM_MAX_EVENTS:
817                         evsel->max_events = term->val.max_events;
818                         break;
819                 case PERF_EVSEL__CONFIG_TERM_INHERIT:
820                         /*
821                          * attr->inherit should has already been set by
822                          * perf_evsel__config. If user explicitly set
823                          * inherit using config terms, override global
824                          * opt->no_inherit setting.
825                          */
826                         attr->inherit = term->val.inherit ? 1 : 0;
827                         break;
828                 case PERF_EVSEL__CONFIG_TERM_OVERWRITE:
829                         attr->write_backward = term->val.overwrite ? 1 : 0;
830                         break;
831                 case PERF_EVSEL__CONFIG_TERM_DRV_CFG:
832                         break;
833                 case PERF_EVSEL__CONFIG_TERM_PERCORE:
834                         break;
835                 default:
836                         break;
837                 }
838         }
839 
840         /* User explicitly set per-event callgraph, clear the old setting and reset. */
841         if ((callgraph_buf != NULL) || (dump_size > 0) || max_stack) {
842                 bool sample_address = false;
843 
844                 if (max_stack) {
845                         param.max_stack = max_stack;
846                         if (callgraph_buf == NULL)
847                                 callgraph_buf = "fp";
848                 }
849 
850                 /* parse callgraph parameters */
851                 if (callgraph_buf != NULL) {
852                         if (!strcmp(callgraph_buf, "no")) {
853                                 param.enabled = false;
854                                 param.record_mode = CALLCHAIN_NONE;
855                         } else {
856                                 param.enabled = true;
857                                 if (parse_callchain_record(callgraph_buf, &param)) {
858                                         pr_err("per-event callgraph setting for %s failed. "
859                                                "Apply callgraph global setting for it\n",
860                                                evsel->name);
861                                         return;
862                                 }
863                                 if (param.record_mode == CALLCHAIN_DWARF)
864                                         sample_address = true;
865                         }
866                 }
867                 if (dump_size > 0) {
868                         dump_size = round_up(dump_size, sizeof(u64));
869                         param.dump_size = dump_size;
870                 }
871 
872                 /* If global callgraph set, clear it */
873                 if (callchain_param.enabled)
874                         perf_evsel__reset_callgraph(evsel, &callchain_param);
875 
876                 /* set perf-event callgraph */
877                 if (param.enabled) {
878                         if (sample_address) {
879                                 perf_evsel__set_sample_bit(evsel, ADDR);
880                                 perf_evsel__set_sample_bit(evsel, DATA_SRC);
881                                 evsel->attr.mmap_data = track;
882                         }
883                         perf_evsel__config_callchain(evsel, opts, &param);
884                 }
885         }
886 }
887 
888 static bool is_dummy_event(struct perf_evsel *evsel)
889 {
890         return (evsel->attr.type == PERF_TYPE_SOFTWARE) &&
891                (evsel->attr.config == PERF_COUNT_SW_DUMMY);
892 }
893 
894 /*
895  * The enable_on_exec/disabled value strategy:
896  *
897  *  1) For any type of traced program:
898  *    - all independent events and group leaders are disabled
899  *    - all group members are enabled
900  *
901  *     Group members are ruled by group leaders. They need to
902  *     be enabled, because the group scheduling relies on that.
903  *
904  *  2) For traced programs executed by perf:
905  *     - all independent events and group leaders have
906  *       enable_on_exec set
907  *     - we don't specifically enable or disable any event during
908  *       the record command
909  *
910  *     Independent events and group leaders are initially disabled
911  *     and get enabled by exec. Group members are ruled by group
912  *     leaders as stated in 1).
913  *
914  *  3) For traced programs attached by perf (pid/tid):
915  *     - we specifically enable or disable all events during
916  *       the record command
917  *
918  *     When attaching events to already running traced we
919  *     enable/disable events specifically, as there's no
920  *     initial traced exec call.
921  */
922 void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts,
923                         struct callchain_param *callchain)
924 {
925         struct perf_evsel *leader = evsel->leader;
926         struct perf_event_attr *attr = &evsel->attr;
927         int track = evsel->tracking;
928         bool per_cpu = opts->target.default_per_cpu && !opts->target.per_thread;
929 
930         attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
931         attr->inherit       = !opts->no_inherit;
932         attr->write_backward = opts->overwrite ? 1 : 0;
933 
934         perf_evsel__set_sample_bit(evsel, IP);
935         perf_evsel__set_sample_bit(evsel, TID);
936 
937         if (evsel->sample_read) {
938                 perf_evsel__set_sample_bit(evsel, READ);
939 
940                 /*
941                  * We need ID even in case of single event, because
942                  * PERF_SAMPLE_READ process ID specific data.
943                  */
944                 perf_evsel__set_sample_id(evsel, false);
945 
946                 /*
947                  * Apply group format only if we belong to group
948                  * with more than one members.
949                  */
950                 if (leader->nr_members > 1) {
951                         attr->read_format |= PERF_FORMAT_GROUP;
952                         attr->inherit = 0;
953                 }
954         }
955 
956         /*
957          * We default some events to have a default interval. But keep
958          * it a weak assumption overridable by the user.
959          */
960         if (!attr->sample_period || (opts->user_freq != UINT_MAX ||
961                                      opts->user_interval != ULLONG_MAX)) {
962                 if (opts->freq) {
963                         perf_evsel__set_sample_bit(evsel, PERIOD);
964                         attr->freq              = 1;
965                         attr->sample_freq       = opts->freq;
966                 } else {
967                         attr->sample_period = opts->default_interval;
968                 }
969         }
970 
971         /*
972          * Disable sampling for all group members other
973          * than leader in case leader 'leads' the sampling.
974          */
975         if ((leader != evsel) && leader->sample_read) {
976                 attr->freq           = 0;
977                 attr->sample_freq    = 0;
978                 attr->sample_period  = 0;
979                 attr->write_backward = 0;
980 
981                 /*
982                  * We don't get sample for slave events, we make them
983                  * when delivering group leader sample. Set the slave
984                  * event to follow the master sample_type to ease up
985                  * report.
986                  */
987                 attr->sample_type = leader->attr.sample_type;
988         }
989 
990         if (opts->no_samples)
991                 attr->sample_freq = 0;
992 
993         if (opts->inherit_stat) {
994                 evsel->attr.read_format |=
995                         PERF_FORMAT_TOTAL_TIME_ENABLED |
996                         PERF_FORMAT_TOTAL_TIME_RUNNING |
997                         PERF_FORMAT_ID;
998                 attr->inherit_stat = 1;
999         }
1000 
1001         if (opts->sample_address) {
1002                 perf_evsel__set_sample_bit(evsel, ADDR);
1003                 attr->mmap_data = track;
1004         }
1005 
1006         /*
1007          * We don't allow user space callchains for  function trace
1008          * event, due to issues with page faults while tracing page
1009          * fault handler and its overall trickiness nature.
1010          */
1011         if (perf_evsel__is_function_event(evsel))
1012                 evsel->attr.exclude_callchain_user = 1;
1013 
1014         if (callchain && callchain->enabled && !evsel->no_aux_samples)
1015                 perf_evsel__config_callchain(evsel, opts, callchain);
1016 
1017         if (opts->sample_intr_regs) {
1018                 attr->sample_regs_intr = opts->sample_intr_regs;
1019                 perf_evsel__set_sample_bit(evsel, REGS_INTR);
1020         }
1021 
1022         if (opts->sample_user_regs) {
1023                 attr->sample_regs_user |= opts->sample_user_regs;
1024                 perf_evsel__set_sample_bit(evsel, REGS_USER);
1025         }
1026 
1027         if (target__has_cpu(&opts->target) || opts->sample_cpu)
1028                 perf_evsel__set_sample_bit(evsel, CPU);
1029 
1030         /*
1031          * When the user explicitly disabled time don't force it here.
1032          */
1033         if (opts->sample_time &&
1034             (!perf_missing_features.sample_id_all &&
1035             (!opts->no_inherit || target__has_cpu(&opts->target) || per_cpu ||
1036              opts->sample_time_set)))
1037                 perf_evsel__set_sample_bit(evsel, TIME);
1038 
1039         if (opts->raw_samples && !evsel->no_aux_samples) {
1040                 perf_evsel__set_sample_bit(evsel, TIME);
1041                 perf_evsel__set_sample_bit(evsel, RAW);
1042                 perf_evsel__set_sample_bit(evsel, CPU);
1043         }
1044 
1045         if (opts->sample_address)
1046                 perf_evsel__set_sample_bit(evsel, DATA_SRC);
1047 
1048         if (opts->sample_phys_addr)
1049                 perf_evsel__set_sample_bit(evsel, PHYS_ADDR);
1050 
1051         if (opts->no_buffering) {
1052                 attr->watermark = 0;
1053                 attr->wakeup_events = 1;
1054         }
1055         if (opts->branch_stack && !evsel->no_aux_samples) {
1056                 perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
1057                 attr->branch_sample_type = opts->branch_stack;
1058         }
1059 
1060         if (opts->sample_weight)
1061                 perf_evsel__set_sample_bit(evsel, WEIGHT);
1062 
1063         attr->task  = track;
1064         attr->mmap  = track;
1065         attr->mmap2 = track && !perf_missing_features.mmap2;
1066         attr->comm  = track;
1067         attr->ksymbol = track && !perf_missing_features.ksymbol;
1068         attr->bpf_event = track && !opts->no_bpf_event &&
1069                 !perf_missing_features.bpf_event;
1070 
1071         if (opts->record_namespaces)
1072                 attr->namespaces  = track;
1073 
1074         if (opts->record_switch_events)
1075                 attr->context_switch = track;
1076 
1077         if (opts->sample_transaction)
1078                 perf_evsel__set_sample_bit(evsel, TRANSACTION);
1079 
1080         if (opts->running_time) {
1081                 evsel->attr.read_format |=
1082                         PERF_FORMAT_TOTAL_TIME_ENABLED |
1083                         PERF_FORMAT_TOTAL_TIME_RUNNING;
1084         }
1085 
1086         /*
1087          * XXX see the function comment above
1088          *
1089          * Disabling only independent events or group leaders,
1090          * keeping group members enabled.
1091          */
1092         if (perf_evsel__is_group_leader(evsel))
1093                 attr->disabled = 1;
1094 
1095         /*
1096          * Setting enable_on_exec for independent events and
1097          * group leaders for traced executed by perf.
1098          */
1099         if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
1100                 !opts->initial_delay)
1101                 attr->enable_on_exec = 1;
1102 
1103         if (evsel->immediate) {
1104                 attr->disabled = 0;
1105                 attr->enable_on_exec = 0;
1106         }
1107 
1108         clockid = opts->clockid;
1109         if (opts->use_clockid) {
1110                 attr->use_clockid = 1;
1111                 attr->clockid = opts->clockid;
1112         }
1113 
1114         if (evsel->precise_max)
1115                 attr->precise_ip = 3;
1116 
1117         if (opts->all_user) {
1118                 attr->exclude_kernel = 1;
1119                 attr->exclude_user   = 0;
1120         }
1121 
1122         if (opts->all_kernel) {
1123                 attr->exclude_kernel = 0;
1124                 attr->exclude_user   = 1;
1125         }
1126 
1127         if (evsel->own_cpus || evsel->unit)
1128                 evsel->attr.read_format |= PERF_FORMAT_ID;
1129 
1130         /*
1131          * Apply event specific term settings,
1132          * it overloads any global configuration.
1133          */
1134         apply_config_terms(evsel, opts, track);
1135 
1136         evsel->ignore_missing_thread = opts->ignore_missing_thread;
1137 
1138         /* The --period option takes the precedence. */
1139         if (opts->period_set) {
1140                 if (opts->period)
1141                         perf_evsel__set_sample_bit(evsel, PERIOD);
1142                 else
1143                         perf_evsel__reset_sample_bit(evsel, PERIOD);
1144         }
1145 
1146         /*
1147          * For initial_delay, a dummy event is added implicitly.
1148          * The software event will trigger -EOPNOTSUPP error out,
1149          * if BRANCH_STACK bit is set.
1150          */
1151         if (opts->initial_delay && is_dummy_event(evsel))
1152                 perf_evsel__reset_sample_bit(evsel, BRANCH_STACK);
1153 }
1154 
1155 static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
1156 {
1157         evsel->fd = xyarray__new(ncpus, nthreads, sizeof(int));
1158 
1159         if (evsel->fd) {
1160                 int cpu, thread;
1161                 for (cpu = 0; cpu < ncpus; cpu++) {
1162                         for (thread = 0; thread < nthreads; thread++) {
1163                                 FD(evsel, cpu, thread) = -1;
1164                         }
1165                 }
1166         }
1167 
1168         return evsel->fd != NULL ? 0 : -ENOMEM;
1169 }
1170 
1171 static int perf_evsel__run_ioctl(struct perf_evsel *evsel,
1172                           int ioc,  void *arg)
1173 {
1174         int cpu, thread;
1175 
1176         for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++) {
1177                 for (thread = 0; thread < xyarray__max_y(evsel->fd); thread++) {
1178                         int fd = FD(evsel, cpu, thread),
1179                             err = ioctl(fd, ioc, arg);
1180 
1181                         if (err)
1182                                 return err;
1183                 }
1184         }
1185 
1186         return 0;
1187 }
1188 
1189 int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter)
1190 {
1191         return perf_evsel__run_ioctl(evsel,
1192                                      PERF_EVENT_IOC_SET_FILTER,
1193                                      (void *)filter);
1194 }
1195 
1196 int perf_evsel__set_filter(struct perf_evsel *evsel, const char *filter)
1197 {
1198         char *new_filter = strdup(filter);
1199 
1200         if (new_filter != NULL) {
1201                 free(evsel->filter);
1202                 evsel->filter = new_filter;
1203                 return 0;
1204         }
1205 
1206         return -1;
1207 }
1208 
1209 static int perf_evsel__append_filter(struct perf_evsel *evsel,
1210                                      const char *fmt, const char *filter)
1211 {
1212         char *new_filter;
1213 
1214         if (evsel->filter == NULL)
1215                 return perf_evsel__set_filter(evsel, filter);
1216 
1217         if (asprintf(&new_filter, fmt, evsel->filter, filter) > 0) {
1218                 free(evsel->filter);
1219                 evsel->filter = new_filter;
1220                 return 0;
1221         }
1222 
1223         return -1;
1224 }
1225 
1226 int perf_evsel__append_tp_filter(struct perf_evsel *evsel, const char *filter)
1227 {
1228         return perf_evsel__append_filter(evsel, "(%s) && (%s)", filter);
1229 }
1230 
1231 int perf_evsel__append_addr_filter(struct perf_evsel *evsel, const char *filter)
1232 {
1233         return perf_evsel__append_filter(evsel, "%s,%s", filter);
1234 }
1235 
1236 int perf_evsel__enable(struct perf_evsel *evsel)
1237 {
1238         int err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_ENABLE, 0);
1239 
1240         if (!err)
1241                 evsel->disabled = false;
1242 
1243         return err;
1244 }
1245 
1246 int perf_evsel__disable(struct perf_evsel *evsel)
1247 {
1248         int err = perf_evsel__run_ioctl(evsel, PERF_EVENT_IOC_DISABLE, 0);
1249         /*
1250          * We mark it disabled here so that tools that disable a event can
1251          * ignore events after they disable it. I.e. the ring buffer may have
1252          * already a few more events queued up before the kernel got the stop
1253          * request.
1254          */
1255         if (!err)
1256                 evsel->disabled = true;
1257 
1258         return err;
1259 }
1260 
1261 int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
1262 {
1263         if (ncpus == 0 || nthreads == 0)
1264                 return 0;
1265 
1266         if (evsel->system_wide)
1267                 nthreads = 1;
1268 
1269         evsel->sample_id = xyarray__new(ncpus, nthreads, sizeof(struct perf_sample_id));
1270         if (evsel->sample_id == NULL)
1271                 return -ENOMEM;
1272 
1273         evsel->id = zalloc(ncpus * nthreads * sizeof(u64));
1274         if (evsel->id == NULL) {
1275                 xyarray__delete(evsel->sample_id);
1276                 evsel->sample_id = NULL;
1277                 return -ENOMEM;
1278         }
1279 
1280         return 0;
1281 }
1282 
1283 static void perf_evsel__free_fd(struct perf_evsel *evsel)
1284 {
1285         xyarray__delete(evsel->fd);
1286         evsel->fd = NULL;
1287 }
1288 
1289 static void perf_evsel__free_id(struct perf_evsel *evsel)
1290 {
1291         xyarray__delete(evsel->sample_id);
1292         evsel->sample_id = NULL;
1293         zfree(&evsel->id);
1294         evsel->ids = 0;
1295 }
1296 
1297 static void perf_evsel__free_config_terms(struct perf_evsel *evsel)
1298 {
1299         struct perf_evsel_config_term *term, *h;
1300 
1301         list_for_each_entry_safe(term, h, &evsel->config_terms, list) {
1302                 list_del_init(&term->list);
1303                 free(term);
1304         }
1305 }
1306 
1307 void perf_evsel__close_fd(struct perf_evsel *evsel)
1308 {
1309         int cpu, thread;
1310 
1311         for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++)
1312                 for (thread = 0; thread < xyarray__max_y(evsel->fd); ++thread) {
1313                         close(FD(evsel, cpu, thread));
1314                         FD(evsel, cpu, thread) = -1;
1315                 }
1316 }
1317 
1318 void perf_evsel__exit(struct perf_evsel *evsel)
1319 {
1320         assert(list_empty(&evsel->node));
1321         assert(evsel->evlist == NULL);
1322         perf_evsel__free_counts(evsel);
1323         perf_evsel__free_fd(evsel);
1324         perf_evsel__free_id(evsel);
1325         perf_evsel__free_config_terms(evsel);
1326         cgroup__put(evsel->cgrp);
1327         cpu_map__put(evsel->cpus);
1328         cpu_map__put(evsel->own_cpus);
1329         thread_map__put(evsel->threads);
1330         zfree(&evsel->group_name);
1331         zfree(&evsel->name);
1332         perf_evsel__object.fini(evsel);
1333 }
1334 
1335 void perf_evsel__delete(struct perf_evsel *evsel)
1336 {
1337         perf_evsel__exit(evsel);
1338         free(evsel);
1339 }
1340 
1341 void perf_evsel__compute_deltas(struct perf_evsel *evsel, int cpu, int thread,
1342                                 struct perf_counts_values *count)
1343 {
1344         struct perf_counts_values tmp;
1345 
1346         if (!evsel->prev_raw_counts)
1347                 return;
1348 
1349         if (cpu == -1) {
1350                 tmp = evsel->prev_raw_counts->aggr;
1351                 evsel->prev_raw_counts->aggr = *count;
1352         } else {
1353                 tmp = *perf_counts(evsel->prev_raw_counts, cpu, thread);
1354                 *perf_counts(evsel->prev_raw_counts, cpu, thread) = *count;
1355         }
1356 
1357         count->val = count->val - tmp.val;
1358         count->ena = count->ena - tmp.ena;
1359         count->run = count->run - tmp.run;
1360 }
1361 
1362 void perf_counts_values__scale(struct perf_counts_values *count,
1363                                bool scale, s8 *pscaled)
1364 {
1365         s8 scaled = 0;
1366 
1367         if (scale) {
1368                 if (count->run == 0) {
1369                         scaled = -1;
1370                         count->val = 0;
1371                 } else if (count->run < count->ena) {
1372                         scaled = 1;
1373                         count->val = (u64)((double) count->val * count->ena / count->run);
1374                 }
1375         }
1376 
1377         if (pscaled)
1378                 *pscaled = scaled;
1379 }
1380 
1381 static int perf_evsel__read_size(struct perf_evsel *evsel)
1382 {
1383         u64 read_format = evsel->attr.read_format;
1384         int entry = sizeof(u64); /* value */
1385         int size = 0;
1386         int nr = 1;
1387 
1388         if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1389                 size += sizeof(u64);
1390 
1391         if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1392                 size += sizeof(u64);
1393 
1394         if (read_format & PERF_FORMAT_ID)
1395                 entry += sizeof(u64);
1396 
1397         if (read_format & PERF_FORMAT_GROUP) {
1398                 nr = evsel->nr_members;
1399                 size += sizeof(u64);
1400         }
1401 
1402         size += entry * nr;
1403         return size;
1404 }
1405 
1406 int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread,
1407                      struct perf_counts_values *count)
1408 {
1409         size_t size = perf_evsel__read_size(evsel);
1410 
1411         memset(count, 0, sizeof(*count));
1412 
1413         if (FD(evsel, cpu, thread) < 0)
1414                 return -EINVAL;
1415 
1416         if (readn(FD(evsel, cpu, thread), count->values, size) <= 0)
1417                 return -errno;
1418 
1419         return 0;
1420 }
1421 
1422 static int
1423 perf_evsel__read_one(struct perf_evsel *evsel, int cpu, int thread)
1424 {
1425         struct perf_counts_values *count = perf_counts(evsel->counts, cpu, thread);
1426 
1427         return perf_evsel__read(evsel, cpu, thread, count);
1428 }
1429 
1430 static void
1431 perf_evsel__set_count(struct perf_evsel *counter, int cpu, int thread,
1432                       u64 val, u64 ena, u64 run)
1433 {
1434         struct perf_counts_values *count;
1435 
1436         count = perf_counts(counter->counts, cpu, thread);
1437 
1438         count->val    = val;
1439         count->ena    = ena;
1440         count->run    = run;
1441         count->loaded = true;
1442 }
1443 
1444 static int
1445 perf_evsel__process_group_data(struct perf_evsel *leader,
1446                                int cpu, int thread, u64 *data)
1447 {
1448         u64 read_format = leader->attr.read_format;
1449         struct sample_read_value *v;
1450         u64 nr, ena = 0, run = 0, i;
1451 
1452         nr = *data++;
1453 
1454         if (nr != (u64) leader->nr_members)
1455                 return -EINVAL;
1456 
1457         if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
1458                 ena = *data++;
1459 
1460         if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
1461                 run = *data++;
1462 
1463         v = (struct sample_read_value *) data;
1464 
1465         perf_evsel__set_count(leader, cpu, thread,
1466                               v[0].value, ena, run);
1467 
1468         for (i = 1; i < nr; i++) {
1469                 struct perf_evsel *counter;
1470 
1471                 counter = perf_evlist__id2evsel(leader->evlist, v[i].id);
1472                 if (!counter)
1473                         return -EINVAL;
1474 
1475                 perf_evsel__set_count(counter, cpu, thread,
1476                                       v[i].value, ena, run);
1477         }
1478 
1479         return 0;
1480 }
1481 
1482 static int
1483 perf_evsel__read_group(struct perf_evsel *leader, int cpu, int thread)
1484 {
1485         struct perf_stat_evsel *ps = leader->stats;
1486         u64 read_format = leader->attr.read_format;
1487         int size = perf_evsel__read_size(leader);
1488         u64 *data = ps->group_data;
1489 
1490         if (!(read_format & PERF_FORMAT_ID))
1491                 return -EINVAL;
1492 
1493         if (!perf_evsel__is_group_leader(leader))
1494                 return -EINVAL;
1495 
1496         if (!data) {
1497                 data = zalloc(size);
1498                 if (!data)
1499                         return -ENOMEM;
1500 
1501                 ps->group_data = data;
1502         }
1503 
1504         if (FD(leader, cpu, thread) < 0)
1505                 return -EINVAL;
1506 
1507         if (readn(FD(leader, cpu, thread), data, size) <= 0)
1508                 return -errno;
1509 
1510         return perf_evsel__process_group_data(leader, cpu, thread, data);
1511 }
1512 
1513 int perf_evsel__read_counter(struct perf_evsel *evsel, int cpu, int thread)
1514 {
1515         u64 read_format = evsel->attr.read_format;
1516 
1517         if (read_format & PERF_FORMAT_GROUP)
1518                 return perf_evsel__read_group(evsel, cpu, thread);
1519         else
1520                 return perf_evsel__read_one(evsel, cpu, thread);
1521 }
1522 
1523 int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
1524                               int cpu, int thread, bool scale)
1525 {
1526         struct perf_counts_values count;
1527         size_t nv = scale ? 3 : 1;
1528 
1529         if (FD(evsel, cpu, thread) < 0)
1530                 return -EINVAL;
1531 
1532         if (evsel->counts == NULL && perf_evsel__alloc_counts(evsel, cpu + 1, thread + 1) < 0)
1533                 return -ENOMEM;
1534 
1535         if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) <= 0)
1536                 return -errno;
1537 
1538         perf_evsel__compute_deltas(evsel, cpu, thread, &count);
1539         perf_counts_values__scale(&count, scale, NULL);
1540         *perf_counts(evsel->counts, cpu, thread) = count;
1541         return 0;
1542 }
1543 
1544 static int get_group_fd(struct perf_evsel *evsel, int cpu, int thread)
1545 {
1546         struct perf_evsel *leader = evsel->leader;
1547         int fd;
1548 
1549         if (perf_evsel__is_group_leader(evsel))
1550                 return -1;
1551 
1552         /*
1553          * Leader must be already processed/open,
1554          * if not it's a bug.
1555          */
1556         BUG_ON(!leader->fd);
1557 
1558         fd = FD(leader, cpu, thread);
1559         BUG_ON(fd == -1);
1560 
1561         return fd;
1562 }
1563 
1564 struct bit_names {
1565         int bit;
1566         const char *name;
1567 };
1568 
1569 static void __p_bits(char *buf, size_t size, u64 value, struct bit_names *bits)
1570 {
1571         bool first_bit = true;
1572         int i = 0;
1573 
1574         do {
1575                 if (value & bits[i].bit) {
1576                         buf += scnprintf(buf, size, "%s%s", first_bit ? "" : "|", bits[i].name);
1577                         first_bit = false;
1578                 }
1579         } while (bits[++i].name != NULL);
1580 }
1581 
1582 static void __p_sample_type(char *buf, size_t size, u64 value)
1583 {
1584 #define bit_name(n) { PERF_SAMPLE_##n, #n }
1585         struct bit_names bits[] = {
1586                 bit_name(IP), bit_name(TID), bit_name(TIME), bit_name(ADDR),
1587                 bit_name(READ), bit_name(CALLCHAIN), bit_name(ID), bit_name(CPU),
1588                 bit_name(PERIOD), bit_name(STREAM_ID), bit_name(RAW),
1589                 bit_name(BRANCH_STACK), bit_name(REGS_USER), bit_name(STACK_USER),
1590                 bit_name(IDENTIFIER), bit_name(REGS_INTR), bit_name(DATA_SRC),
1591                 bit_name(WEIGHT), bit_name(PHYS_ADDR),
1592                 { .name = NULL, }
1593         };
1594 #undef bit_name
1595         __p_bits(buf, size, value, bits);
1596 }
1597 
1598 static void __p_branch_sample_type(char *buf, size_t size, u64 value)
1599 {
1600 #define bit_name(n) { PERF_SAMPLE_BRANCH_##n, #n }
1601         struct bit_names bits[] = {
1602                 bit_name(USER), bit_name(KERNEL), bit_name(HV), bit_name(ANY),
1603                 bit_name(ANY_CALL), bit_name(ANY_RETURN), bit_name(IND_CALL),
1604                 bit_name(ABORT_TX), bit_name(IN_TX), bit_name(NO_TX),
1605                 bit_name(COND), bit_name(CALL_STACK), bit_name(IND_JUMP),
1606                 bit_name(CALL), bit_name(NO_FLAGS), bit_name(NO_CYCLES),
1607                 { .name = NULL, }
1608         };
1609 #undef bit_name
1610         __p_bits(buf, size, value, bits);
1611 }
1612 
1613 static void __p_read_format(char *buf, size_t size, u64 value)
1614 {
1615 #define bit_name(n) { PERF_FORMAT_##n, #n }
1616         struct bit_names bits[] = {
1617                 bit_name(TOTAL_TIME_ENABLED), bit_name(TOTAL_TIME_RUNNING),
1618                 bit_name(ID), bit_name(GROUP),
1619                 { .name = NULL, }
1620         };
1621 #undef bit_name
1622         __p_bits(buf, size, value, bits);
1623 }
1624 
1625 #define BUF_SIZE                1024
1626 
1627 #define p_hex(val)              snprintf(buf, BUF_SIZE, "%#"PRIx64, (uint64_t)(val))
1628 #define p_unsigned(val)         snprintf(buf, BUF_SIZE, "%"PRIu64, (uint64_t)(val))
1629 #define p_signed(val)           snprintf(buf, BUF_SIZE, "%"PRId64, (int64_t)(val))
1630 #define p_sample_type(val)      __p_sample_type(buf, BUF_SIZE, val)
1631 #define p_branch_sample_type(val) __p_branch_sample_type(buf, BUF_SIZE, val)
1632 #define p_read_format(val)      __p_read_format(buf, BUF_SIZE, val)
1633 
1634 #define PRINT_ATTRn(_n, _f, _p)                         \
1635 do {                                                    \
1636         if (attr->_f) {                                 \
1637                 _p(attr->_f);                           \
1638                 ret += attr__fprintf(fp, _n, buf, priv);\
1639         }                                               \
1640 } while (0)
1641 
1642 #define PRINT_ATTRf(_f, _p)     PRINT_ATTRn(#_f, _f, _p)
1643 
1644 int perf_event_attr__fprintf(FILE *fp, struct perf_event_attr *attr,
1645                              attr__fprintf_f attr__fprintf, void *priv)
1646 {
1647         char buf[BUF_SIZE];
1648         int ret = 0;
1649 
1650         PRINT_ATTRf(type, p_unsigned);
1651         PRINT_ATTRf(size, p_unsigned);
1652         PRINT_ATTRf(config, p_hex);
1653         PRINT_ATTRn("{ sample_period, sample_freq }", sample_period, p_unsigned);
1654         PRINT_ATTRf(sample_type, p_sample_type);
1655         PRINT_ATTRf(read_format, p_read_format);
1656 
1657         PRINT_ATTRf(disabled, p_unsigned);
1658         PRINT_ATTRf(inherit, p_unsigned);
1659         PRINT_ATTRf(pinned, p_unsigned);
1660         PRINT_ATTRf(exclusive, p_unsigned);
1661         PRINT_ATTRf(exclude_user, p_unsigned);
1662         PRINT_ATTRf(exclude_kernel, p_unsigned);
1663         PRINT_ATTRf(exclude_hv, p_unsigned);
1664         PRINT_ATTRf(exclude_idle, p_unsigned);
1665         PRINT_ATTRf(mmap, p_unsigned);
1666         PRINT_ATTRf(comm, p_unsigned);
1667         PRINT_ATTRf(freq, p_unsigned);
1668         PRINT_ATTRf(inherit_stat, p_unsigned);
1669         PRINT_ATTRf(enable_on_exec, p_unsigned);
1670         PRINT_ATTRf(task, p_unsigned);
1671         PRINT_ATTRf(watermark, p_unsigned);
1672         PRINT_ATTRf(precise_ip, p_unsigned);
1673         PRINT_ATTRf(mmap_data, p_unsigned);
1674         PRINT_ATTRf(sample_id_all, p_unsigned);
1675         PRINT_ATTRf(exclude_host, p_unsigned);
1676         PRINT_ATTRf(exclude_guest, p_unsigned);
1677         PRINT_ATTRf(exclude_callchain_kernel, p_unsigned);
1678         PRINT_ATTRf(exclude_callchain_user, p_unsigned);
1679         PRINT_ATTRf(mmap2, p_unsigned);
1680         PRINT_ATTRf(comm_exec, p_unsigned);
1681         PRINT_ATTRf(use_clockid, p_unsigned);
1682         PRINT_ATTRf(context_switch, p_unsigned);
1683         PRINT_ATTRf(write_backward, p_unsigned);
1684         PRINT_ATTRf(namespaces, p_unsigned);
1685         PRINT_ATTRf(ksymbol, p_unsigned);
1686         PRINT_ATTRf(bpf_event, p_unsigned);
1687 
1688         PRINT_ATTRn("{ wakeup_events, wakeup_watermark }", wakeup_events, p_unsigned);
1689         PRINT_ATTRf(bp_type, p_unsigned);
1690         PRINT_ATTRn("{ bp_addr, config1 }", bp_addr, p_hex);
1691         PRINT_ATTRn("{ bp_len, config2 }", bp_len, p_hex);
1692         PRINT_ATTRf(branch_sample_type, p_branch_sample_type);
1693         PRINT_ATTRf(sample_regs_user, p_hex);
1694         PRINT_ATTRf(sample_stack_user, p_unsigned);
1695         PRINT_ATTRf(clockid, p_signed);
1696         PRINT_ATTRf(sample_regs_intr, p_hex);
1697         PRINT_ATTRf(aux_watermark, p_unsigned);
1698         PRINT_ATTRf(sample_max_stack, p_unsigned);
1699 
1700         return ret;
1701 }
1702 
1703 static int __open_attr__fprintf(FILE *fp, const char *name, const char *val,
1704                                 void *priv __maybe_unused)
1705 {
1706         return fprintf(fp, "  %-32s %s\n", name, val);
1707 }
1708 
1709 static void perf_evsel__remove_fd(struct perf_evsel *pos,
1710                                   int nr_cpus, int nr_threads,
1711                                   int thread_idx)
1712 {
1713         for (int cpu = 0; cpu < nr_cpus; cpu++)
1714                 for (int thread = thread_idx; thread < nr_threads - 1; thread++)
1715                         FD(pos, cpu, thread) = FD(pos, cpu, thread + 1);
1716 }
1717 
1718 static int update_fds(struct perf_evsel *evsel,
1719                       int nr_cpus, int cpu_idx,
1720                       int nr_threads, int thread_idx)
1721 {
1722         struct perf_evsel *pos;
1723 
1724         if (cpu_idx >= nr_cpus || thread_idx >= nr_threads)
1725                 return -EINVAL;
1726 
1727         evlist__for_each_entry(evsel->evlist, pos) {
1728                 nr_cpus = pos != evsel ? nr_cpus : cpu_idx;
1729 
1730                 perf_evsel__remove_fd(pos, nr_cpus, nr_threads, thread_idx);
1731 
1732                 /*
1733                  * Since fds for next evsel has not been created,
1734                  * there is no need to iterate whole event list.
1735                  */
1736                 if (pos == evsel)
1737                         break;
1738         }
1739         return 0;
1740 }
1741 
1742 static bool ignore_missing_thread(struct perf_evsel *evsel,
1743                                   int nr_cpus, int cpu,
1744                                   struct thread_map *threads,
1745                                   int thread, int err)
1746 {
1747         pid_t ignore_pid = thread_map__pid(threads, thread);
1748 
1749         if (!evsel->ignore_missing_thread)
1750                 return false;
1751 
1752         /* The system wide setup does not work with threads. */
1753         if (evsel->system_wide)
1754                 return false;
1755 
1756         /* The -ESRCH is perf event syscall errno for pid's not found. */
1757         if (err != -ESRCH)
1758                 return false;
1759 
1760         /* If there's only one thread, let it fail. */
1761         if (threads->nr == 1)
1762                 return false;
1763 
1764         /*
1765          * We should remove fd for missing_thread first
1766          * because thread_map__remove() will decrease threads->nr.
1767          */
1768         if (update_fds(evsel, nr_cpus, cpu, threads->nr, thread))
1769                 return false;
1770 
1771         if (thread_map__remove(threads, thread))
1772                 return false;
1773 
1774         pr_warning("WARNING: Ignored open failure for pid %d\n",
1775                    ignore_pid);
1776         return true;
1777 }
1778 
1779 static void display_attr(struct perf_event_attr *attr)
1780 {
1781         if (verbose >= 2) {
1782                 fprintf(stderr, "%.60s\n", graph_dotted_line);
1783                 fprintf(stderr, "perf_event_attr:\n");
1784                 perf_event_attr__fprintf(stderr, attr, __open_attr__fprintf, NULL);
1785                 fprintf(stderr, "%.60s\n", graph_dotted_line);
1786         }
1787 }
1788 
1789 static int perf_event_open(struct perf_evsel *evsel,
1790                            pid_t pid, int cpu, int group_fd,
1791                            unsigned long flags)
1792 {
1793         int precise_ip = evsel->attr.precise_ip;
1794         int fd;
1795 
1796         while (1) {
1797                 pr_debug2("sys_perf_event_open: pid %d  cpu %d  group_fd %d  flags %#lx",
1798                           pid, cpu, group_fd, flags);
1799 
1800                 fd = sys_perf_event_open(&evsel->attr, pid, cpu, group_fd, flags);
1801                 if (fd >= 0)
1802                         break;
1803 
1804                 /* Do not try less precise if not requested. */
1805                 if (!evsel->precise_max)
1806                         break;
1807 
1808                 /*
1809                  * We tried all the precise_ip values, and it's
1810                  * still failing, so leave it to standard fallback.
1811                  */
1812                 if (!evsel->attr.precise_ip) {
1813                         evsel->attr.precise_ip = precise_ip;
1814                         break;
1815                 }
1816 
1817                 pr_debug2("\nsys_perf_event_open failed, error %d\n", -ENOTSUP);
1818                 evsel->attr.precise_ip--;
1819                 pr_debug2("decreasing precise_ip by one (%d)\n", evsel->attr.precise_ip);
1820                 display_attr(&evsel->attr);
1821         }
1822 
1823         return fd;
1824 }
1825 
1826 int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
1827                      struct thread_map *threads)
1828 {
1829         int cpu, thread, nthreads;
1830         unsigned long flags = PERF_FLAG_FD_CLOEXEC;
1831         int pid = -1, err;
1832         enum { NO_CHANGE, SET_TO_MAX, INCREASED_MAX } set_rlimit = NO_CHANGE;
1833 
1834         if (perf_missing_features.write_backward && evsel->attr.write_backward)
1835                 return -EINVAL;
1836 
1837         if (cpus == NULL) {
1838                 static struct cpu_map *empty_cpu_map;
1839 
1840                 if (empty_cpu_map == NULL) {
1841                         empty_cpu_map = cpu_map__dummy_new();
1842                         if (empty_cpu_map == NULL)
1843                                 return -ENOMEM;
1844                 }
1845 
1846                 cpus = empty_cpu_map;
1847         }
1848 
1849         if (threads == NULL) {
1850                 static struct thread_map *empty_thread_map;
1851 
1852                 if (empty_thread_map == NULL) {
1853                         empty_thread_map = thread_map__new_by_tid(-1);
1854                         if (empty_thread_map == NULL)
1855                                 return -ENOMEM;
1856                 }
1857 
1858                 threads = empty_thread_map;
1859         }
1860 
1861         if (evsel->system_wide)
1862                 nthreads = 1;
1863         else
1864                 nthreads = threads->nr;
1865 
1866         if (evsel->fd == NULL &&
1867             perf_evsel__alloc_fd(evsel, cpus->nr, nthreads) < 0)
1868                 return -ENOMEM;
1869 
1870         if (evsel->cgrp) {
1871                 flags |= PERF_FLAG_PID_CGROUP;
1872                 pid = evsel->cgrp->fd;
1873         }
1874 
1875 fallback_missing_features:
1876         if (perf_missing_features.clockid_wrong)
1877                 evsel->attr.clockid = CLOCK_MONOTONIC; /* should always work */
1878         if (perf_missing_features.clockid) {
1879                 evsel->attr.use_clockid = 0;
1880                 evsel->attr.clockid = 0;
1881         }
1882         if (perf_missing_features.cloexec)
1883                 flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC;
1884         if (perf_missing_features.mmap2)
1885                 evsel->attr.mmap2 = 0;
1886         if (perf_missing_features.exclude_guest)
1887                 evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
1888         if (perf_missing_features.lbr_flags)
1889                 evsel->attr.branch_sample_type &= ~(PERF_SAMPLE_BRANCH_NO_FLAGS |
1890                                      PERF_SAMPLE_BRANCH_NO_CYCLES);
1891         if (perf_missing_features.group_read && evsel->attr.inherit)
1892                 evsel->attr.read_format &= ~(PERF_FORMAT_GROUP|PERF_FORMAT_ID);
1893         if (perf_missing_features.ksymbol)
1894                 evsel->attr.ksymbol = 0;
1895         if (perf_missing_features.bpf_event)
1896                 evsel->attr.bpf_event = 0;
1897 retry_sample_id:
1898         if (perf_missing_features.sample_id_all)
1899                 evsel->attr.sample_id_all = 0;
1900 
1901         display_attr(&evsel->attr);
1902 
1903         for (cpu = 0; cpu < cpus->nr; cpu++) {
1904 
1905                 for (thread = 0; thread < nthreads; thread++) {
1906                         int fd, group_fd;
1907 
1908                         if (!evsel->cgrp && !evsel->system_wide)
1909                                 pid = thread_map__pid(threads, thread);
1910 
1911                         group_fd = get_group_fd(evsel, cpu, thread);
1912 retry_open:
1913                         test_attr__ready();
1914 
1915                         fd = perf_event_open(evsel, pid, cpus->map[cpu],
1916                                              group_fd, flags);
1917 
1918                         FD(evsel, cpu, thread) = fd;
1919 
1920                         if (fd < 0) {
1921                                 err = -errno;
1922 
1923                                 if (ignore_missing_thread(evsel, cpus->nr, cpu, threads, thread, err)) {
1924                                         /*
1925                                          * We just removed 1 thread, so take a step
1926                                          * back on thread index and lower the upper
1927                                          * nthreads limit.
1928                                          */
1929                                         nthreads--;
1930                                         thread--;
1931 
1932                                         /* ... and pretend like nothing have happened. */
1933                                         err = 0;
1934                                         continue;
1935                                 }
1936 
1937                                 pr_debug2("\nsys_perf_event_open failed, error %d\n",
1938                                           err);
1939                                 goto try_fallback;
1940                         }
1941 
1942                         pr_debug2(" = %d\n", fd);
1943 
1944                         if (evsel->bpf_fd >= 0) {
1945                                 int evt_fd = fd;
1946                                 int bpf_fd = evsel->bpf_fd;
1947 
1948                                 err = ioctl(evt_fd,
1949                                             PERF_EVENT_IOC_SET_BPF,
1950                                             bpf_fd);
1951                                 if (err && errno != EEXIST) {
1952                                         pr_err("failed to attach bpf fd %d: %s\n",
1953                                                bpf_fd, strerror(errno));
1954                                         err = -EINVAL;
1955                                         goto out_close;
1956                                 }
1957                         }
1958 
1959                         set_rlimit = NO_CHANGE;
1960 
1961                         /*
1962                          * If we succeeded but had to kill clockid, fail and
1963                          * have perf_evsel__open_strerror() print us a nice
1964                          * error.
1965                          */
1966                         if (perf_missing_features.clockid ||
1967                             perf_missing_features.clockid_wrong) {
1968                                 err = -EINVAL;
1969                                 goto out_close;
1970                         }
1971                 }
1972         }
1973 
1974         return 0;
1975 
1976 try_fallback:
1977         /*
1978          * perf stat needs between 5 and 22 fds per CPU. When we run out
1979          * of them try to increase the limits.
1980          */
1981         if (err == -EMFILE && set_rlimit < INCREASED_MAX) {
1982                 struct rlimit l;
1983                 int old_errno = errno;
1984 
1985                 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
1986                         if (set_rlimit == NO_CHANGE)
1987                                 l.rlim_cur = l.rlim_max;
1988                         else {
1989                                 l.rlim_cur = l.rlim_max + 1000;
1990                                 l.rlim_max = l.rlim_cur;
1991                         }
1992                         if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
1993                                 set_rlimit++;
1994                                 errno = old_errno;
1995                                 goto retry_open;
1996                         }
1997                 }
1998                 errno = old_errno;
1999         }
2000 
2001         if (err != -EINVAL || cpu > 0 || thread > 0)
2002                 goto out_close;
2003 
2004         /*
2005          * Must probe features in the order they were added to the
2006          * perf_event_attr interface.
2007          */
2008         if (!perf_missing_features.bpf_event && evsel->attr.bpf_event) {
2009                 perf_missing_features.bpf_event = true;
2010                 pr_debug2("switching off bpf_event\n");
2011                 goto fallback_missing_features;
2012         } else if (!perf_missing_features.ksymbol && evsel->attr.ksymbol) {
2013                 perf_missing_features.ksymbol = true;
2014                 pr_debug2("switching off ksymbol\n");
2015                 goto fallback_missing_features;
2016         } else if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
2017                 perf_missing_features.write_backward = true;
2018                 pr_debug2("switching off write_backward\n");
2019                 goto out_close;
2020         } else if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) {
2021                 perf_missing_features.clockid_wrong = true;
2022                 pr_debug2("switching off clockid\n");
2023                 goto fallback_missing_features;
2024         } else if (!perf_missing_features.clockid && evsel->attr.use_clockid) {
2025                 perf_missing_features.clockid = true;
2026                 pr_debug2("switching off use_clockid\n");
2027                 goto fallback_missing_features;
2028         } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
2029                 perf_missing_features.cloexec = true;
2030                 pr_debug2("switching off cloexec flag\n");
2031                 goto fallback_missing_features;
2032         } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
2033                 perf_missing_features.mmap2 = true;
2034                 pr_debug2("switching off mmap2\n");
2035                 goto fallback_missing_features;
2036         } else if (!perf_missing_features.exclude_guest &&
2037                    (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
2038                 perf_missing_features.exclude_guest = true;
2039                 pr_debug2("switching off exclude_guest, exclude_host\n");
2040                 goto fallback_missing_features;
2041         } else if (!perf_missing_features.sample_id_all) {
2042                 perf_missing_features.sample_id_all = true;
2043                 pr_debug2("switching off sample_id_all\n");
2044                 goto retry_sample_id;
2045         } else if (!perf_missing_features.lbr_flags &&
2046                         (evsel->attr.branch_sample_type &
2047                          (PERF_SAMPLE_BRANCH_NO_CYCLES |
2048                           PERF_SAMPLE_BRANCH_NO_FLAGS))) {
2049                 perf_missing_features.lbr_flags = true;
2050                 pr_debug2("switching off branch sample type no (cycles/flags)\n");
2051                 goto fallback_missing_features;
2052         } else if (!perf_missing_features.group_read &&
2053                     evsel->attr.inherit &&
2054                    (evsel->attr.read_format & PERF_FORMAT_GROUP) &&
2055                    perf_evsel__is_group_leader(evsel)) {
2056                 perf_missing_features.group_read = true;
2057                 pr_debug2("switching off group read\n");
2058                 goto fallback_missing_features;
2059         }
2060 out_close:
2061         if (err)
2062                 threads->err_thread = thread;
2063 
2064         do {
2065                 while (--thread >= 0) {
2066                         close(FD(evsel, cpu, thread));
2067                         FD(evsel, cpu, thread) = -1;
2068                 }
2069                 thread = nthreads;
2070         } while (--cpu >= 0);
2071         return err;
2072 }
2073 
2074 void perf_evsel__close(struct perf_evsel *evsel)
2075 {
2076         if (evsel->fd == NULL)
2077                 return;
2078 
2079         perf_evsel__close_fd(evsel);
2080         perf_evsel__free_fd(evsel);
2081         perf_evsel__free_id(evsel);
2082 }
2083 
2084 int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
2085                              struct cpu_map *cpus)
2086 {
2087         return perf_evsel__open(evsel, cpus, NULL);
2088 }
2089 
2090 int perf_evsel__open_per_thread(struct perf_evsel *evsel,
2091                                 struct thread_map *threads)
2092 {
2093         return perf_evsel__open(evsel, NULL, threads);
2094 }
2095 
2096 static int perf_evsel__parse_id_sample(const struct perf_evsel *evsel,
2097                                        const union perf_event *event,
2098                                        struct perf_sample *sample)
2099 {
2100         u64 type = evsel->attr.sample_type;
2101         const u64 *array = event->sample.array;
2102         bool swapped = evsel->needs_swap;
2103         union u64_swap u;
2104 
2105         array += ((event->header.size -
2106                    sizeof(event->header)) / sizeof(u64)) - 1;
2107 
2108         if (type & PERF_SAMPLE_IDENTIFIER) {
2109                 sample->id = *array;
2110                 array--;
2111         }
2112 
2113         if (type & PERF_SAMPLE_CPU) {
2114                 u.val64 = *array;
2115                 if (swapped) {
2116                         /* undo swap of u64, then swap on individual u32s */
2117                         u.val64 = bswap_64(u.val64);
2118                         u.val32[0] = bswap_32(u.val32[0]);
2119                 }
2120 
2121                 sample->cpu = u.val32[0];
2122                 array--;
2123         }
2124 
2125         if (type & PERF_SAMPLE_STREAM_ID) {
2126                 sample->stream_id = *array;
2127                 array--;
2128         }
2129 
2130         if (type & PERF_SAMPLE_ID) {
2131                 sample->id = *array;
2132                 array--;
2133         }
2134 
2135         if (type & PERF_SAMPLE_TIME) {
2136                 sample->time = *array;
2137                 array--;
2138         }
2139 
2140         if (type & PERF_SAMPLE_TID) {
2141                 u.val64 = *array;
2142                 if (swapped) {
2143                         /* undo swap of u64, then swap on individual u32s */
2144                         u.val64 = bswap_64(u.val64);
2145                         u.val32[0] = bswap_32(u.val32[0]);
2146                         u.val32[1] = bswap_32(u.val32[1]);
2147                 }
2148 
2149                 sample->pid = u.val32[0];
2150                 sample->tid = u.val32[1];
2151                 array--;
2152         }
2153 
2154         return 0;
2155 }
2156 
2157 static inline bool overflow(const void *endp, u16 max_size, const void *offset,
2158                             u64 size)
2159 {
2160         return size > max_size || offset + size > endp;
2161 }
2162 
2163 #define OVERFLOW_CHECK(offset, size, max_size)                          \
2164         do {                                                            \
2165                 if (overflow(endp, (max_size), (offset), (size)))       \
2166                         return -EFAULT;                                 \
2167         } while (0)
2168 
2169 #define OVERFLOW_CHECK_u64(offset) \
2170         OVERFLOW_CHECK(offset, sizeof(u64), sizeof(u64))
2171 
2172 static int
2173 perf_event__check_size(union perf_event *event, unsigned int sample_size)
2174 {
2175         /*
2176          * The evsel's sample_size is based on PERF_SAMPLE_MASK which includes
2177          * up to PERF_SAMPLE_PERIOD.  After that overflow() must be used to
2178          * check the format does not go past the end of the event.
2179          */
2180         if (sample_size + sizeof(event->header) > event->header.size)
2181                 return -EFAULT;
2182 
2183         return 0;
2184 }
2185 
2186 int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
2187                              struct perf_sample *data)
2188 {
2189         u64 type = evsel->attr.sample_type;
2190         bool swapped = evsel->needs_swap;
2191         const u64 *array;
2192         u16 max_size = event->header.size;
2193         const void *endp = (void *)event + max_size;
2194         u64 sz;
2195 
2196         /*
2197          * used for cross-endian analysis. See git commit 65014ab3
2198          * for why this goofiness is needed.
2199          */
2200         union u64_swap u;
2201 
2202         memset(data, 0, sizeof(*data));
2203         data->cpu = data->pid = data->tid = -1;
2204         data->stream_id = data->id = data->time = -1ULL;
2205         data->period = evsel->attr.sample_period;
2206         data->cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
2207         data->misc    = event->header.misc;
2208         data->id = -1ULL;
2209         data->data_src = PERF_MEM_DATA_SRC_NONE;
2210 
2211         if (event->header.type != PERF_RECORD_SAMPLE) {
2212                 if (!evsel->attr.sample_id_all)
2213                         return 0;
2214                 return perf_evsel__parse_id_sample(evsel, event, data);
2215         }
2216 
2217         array = event->sample.array;
2218 
2219         if (perf_event__check_size(event, evsel->sample_size))
2220                 return -EFAULT;
2221 
2222         if (type & PERF_SAMPLE_IDENTIFIER) {
2223                 data->id = *array;
2224                 array++;
2225         }
2226 
2227         if (type & PERF_SAMPLE_IP) {
2228                 data->ip = *array;
2229                 array++;
2230         }
2231 
2232         if (type & PERF_SAMPLE_TID) {
2233                 u.val64 = *array;
2234                 if (swapped) {
2235                         /* undo swap of u64, then swap on individual u32s */
2236                         u.val64 = bswap_64(u.val64);
2237                         u.val32[0] = bswap_32(u.val32[0]);
2238                         u.val32[1] = bswap_32(u.val32[1]);
2239                 }
2240 
2241                 data->pid = u.val32[0];
2242                 data->tid = u.val32[1];
2243                 array++;
2244         }
2245 
2246         if (type & PERF_SAMPLE_TIME) {
2247                 data->time = *array;
2248                 array++;
2249         }
2250 
2251         if (type & PERF_SAMPLE_ADDR) {
2252                 data->addr = *array;
2253                 array++;
2254         }
2255 
2256         if (type & PERF_SAMPLE_ID) {
2257                 data->id = *array;
2258                 array++;
2259         }
2260 
2261         if (type & PERF_SAMPLE_STREAM_ID) {
2262                 data->stream_id = *array;
2263                 array++;
2264         }
2265 
2266         if (type & PERF_SAMPLE_CPU) {
2267 
2268                 u.val64 = *array;
2269                 if (swapped) {
2270                         /* undo swap of u64, then swap on individual u32s */
2271                         u.val64 = bswap_64(u.val64);
2272                         u.val32[0] = bswap_32(u.val32[0]);
2273                 }
2274 
2275                 data->cpu = u.val32[0];
2276                 array++;
2277         }
2278 
2279         if (type & PERF_SAMPLE_PERIOD) {
2280                 data->period = *array;
2281                 array++;
2282         }
2283 
2284         if (type & PERF_SAMPLE_READ) {
2285                 u64 read_format = evsel->attr.read_format;
2286 
2287                 OVERFLOW_CHECK_u64(array);
2288                 if (read_format & PERF_FORMAT_GROUP)
2289                         data->read.group.nr = *array;
2290                 else
2291                         data->read.one.value = *array;
2292 
2293                 array++;
2294 
2295                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2296                         OVERFLOW_CHECK_u64(array);
2297                         data->read.time_enabled = *array;
2298                         array++;
2299                 }
2300 
2301                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2302                         OVERFLOW_CHECK_u64(array);
2303                         data->read.time_running = *array;
2304                         array++;
2305                 }
2306 
2307                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2308                 if (read_format & PERF_FORMAT_GROUP) {
2309                         const u64 max_group_nr = UINT64_MAX /
2310                                         sizeof(struct sample_read_value);
2311 
2312                         if (data->read.group.nr > max_group_nr)
2313                                 return -EFAULT;
2314                         sz = data->read.group.nr *
2315                              sizeof(struct sample_read_value);
2316                         OVERFLOW_CHECK(array, sz, max_size);
2317                         data->read.group.values =
2318                                         (struct sample_read_value *)array;
2319                         array = (void *)array + sz;
2320                 } else {
2321                         OVERFLOW_CHECK_u64(array);
2322                         data->read.one.id = *array;
2323                         array++;
2324                 }
2325         }
2326 
2327         if (evsel__has_callchain(evsel)) {
2328                 const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
2329 
2330                 OVERFLOW_CHECK_u64(array);
2331                 data->callchain = (struct ip_callchain *)array++;
2332                 if (data->callchain->nr > max_callchain_nr)
2333                         return -EFAULT;
2334                 sz = data->callchain->nr * sizeof(u64);
2335                 OVERFLOW_CHECK(array, sz, max_size);
2336                 array = (void *)array + sz;
2337         }
2338 
2339         if (type & PERF_SAMPLE_RAW) {
2340                 OVERFLOW_CHECK_u64(array);
2341                 u.val64 = *array;
2342 
2343                 /*
2344                  * Undo swap of u64, then swap on individual u32s,
2345                  * get the size of the raw area and undo all of the
2346                  * swap. The pevent interface handles endianity by
2347                  * itself.
2348                  */
2349                 if (swapped) {
2350                         u.val64 = bswap_64(u.val64);
2351                         u.val32[0] = bswap_32(u.val32[0]);
2352                         u.val32[1] = bswap_32(u.val32[1]);
2353                 }
2354                 data->raw_size = u.val32[0];
2355 
2356                 /*
2357                  * The raw data is aligned on 64bits including the
2358                  * u32 size, so it's safe to use mem_bswap_64.
2359                  */
2360                 if (swapped)
2361                         mem_bswap_64((void *) array, data->raw_size);
2362 
2363                 array = (void *)array + sizeof(u32);
2364 
2365                 OVERFLOW_CHECK(array, data->raw_size, max_size);
2366                 data->raw_data = (void *)array;
2367                 array = (void *)array + data->raw_size;
2368         }
2369 
2370         if (type & PERF_SAMPLE_BRANCH_STACK) {
2371                 const u64 max_branch_nr = UINT64_MAX /
2372                                           sizeof(struct branch_entry);
2373 
2374                 OVERFLOW_CHECK_u64(array);
2375                 data->branch_stack = (struct branch_stack *)array++;
2376 
2377                 if (data->branch_stack->nr > max_branch_nr)
2378                         return -EFAULT;
2379                 sz = data->branch_stack->nr * sizeof(struct branch_entry);
2380                 OVERFLOW_CHECK(array, sz, max_size);
2381                 array = (void *)array + sz;
2382         }
2383 
2384         if (type & PERF_SAMPLE_REGS_USER) {
2385                 OVERFLOW_CHECK_u64(array);
2386                 data->user_regs.abi = *array;
2387                 array++;
2388 
2389                 if (data->user_regs.abi) {
2390                         u64 mask = evsel->attr.sample_regs_user;
2391 
2392                         sz = hweight64(mask) * sizeof(u64);
2393                         OVERFLOW_CHECK(array, sz, max_size);
2394                         data->user_regs.mask = mask;
2395                         data->user_regs.regs = (u64 *)array;
2396                         array = (void *)array + sz;
2397                 }
2398         }
2399 
2400         if (type & PERF_SAMPLE_STACK_USER) {
2401                 OVERFLOW_CHECK_u64(array);
2402                 sz = *array++;
2403 
2404                 data->user_stack.offset = ((char *)(array - 1)
2405                                           - (char *) event);
2406 
2407                 if (!sz) {
2408                         data->user_stack.size = 0;
2409                 } else {
2410                         OVERFLOW_CHECK(array, sz, max_size);
2411                         data->user_stack.data = (char *)array;
2412                         array = (void *)array + sz;
2413                         OVERFLOW_CHECK_u64(array);
2414                         data->user_stack.size = *array++;
2415                         if (WARN_ONCE(data->user_stack.size > sz,
2416                                       "user stack dump failure\n"))
2417                                 return -EFAULT;
2418                 }
2419         }
2420 
2421         if (type & PERF_SAMPLE_WEIGHT) {
2422                 OVERFLOW_CHECK_u64(array);
2423                 data->weight = *array;
2424                 array++;
2425         }
2426 
2427         if (type & PERF_SAMPLE_DATA_SRC) {
2428                 OVERFLOW_CHECK_u64(array);
2429                 data->data_src = *array;
2430                 array++;
2431         }
2432 
2433         if (type & PERF_SAMPLE_TRANSACTION) {
2434                 OVERFLOW_CHECK_u64(array);
2435                 data->transaction = *array;
2436                 array++;
2437         }
2438 
2439         data->intr_regs.abi = PERF_SAMPLE_REGS_ABI_NONE;
2440         if (type & PERF_SAMPLE_REGS_INTR) {
2441                 OVERFLOW_CHECK_u64(array);
2442                 data->intr_regs.abi = *array;
2443                 array++;
2444 
2445                 if (data->intr_regs.abi != PERF_SAMPLE_REGS_ABI_NONE) {
2446                         u64 mask = evsel->attr.sample_regs_intr;
2447 
2448                         sz = hweight64(mask) * sizeof(u64);
2449                         OVERFLOW_CHECK(array, sz, max_size);
2450                         data->intr_regs.mask = mask;
2451                         data->intr_regs.regs = (u64 *)array;
2452                         array = (void *)array + sz;
2453                 }
2454         }
2455 
2456         data->phys_addr = 0;
2457         if (type & PERF_SAMPLE_PHYS_ADDR) {
2458                 data->phys_addr = *array;
2459                 array++;
2460         }
2461 
2462         return 0;
2463 }
2464 
2465 int perf_evsel__parse_sample_timestamp(struct perf_evsel *evsel,
2466                                        union perf_event *event,
2467                                        u64 *timestamp)
2468 {
2469         u64 type = evsel->attr.sample_type;
2470         const u64 *array;
2471 
2472         if (!(type & PERF_SAMPLE_TIME))
2473                 return -1;
2474 
2475         if (event->header.type != PERF_RECORD_SAMPLE) {
2476                 struct perf_sample data = {
2477                         .time = -1ULL,
2478                 };
2479 
2480                 if (!evsel->attr.sample_id_all)
2481                         return -1;
2482                 if (perf_evsel__parse_id_sample(evsel, event, &data))
2483                         return -1;
2484 
2485                 *timestamp = data.time;
2486                 return 0;
2487         }
2488 
2489         array = event->sample.array;
2490 
2491         if (perf_event__check_size(event, evsel->sample_size))
2492                 return -EFAULT;
2493 
2494         if (type & PERF_SAMPLE_IDENTIFIER)
2495                 array++;
2496 
2497         if (type & PERF_SAMPLE_IP)
2498                 array++;
2499 
2500         if (type & PERF_SAMPLE_TID)
2501                 array++;
2502 
2503         if (type & PERF_SAMPLE_TIME)
2504                 *timestamp = *array;
2505 
2506         return 0;
2507 }
2508 
2509 size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
2510                                      u64 read_format)
2511 {
2512         size_t sz, result = sizeof(struct sample_event);
2513 
2514         if (type & PERF_SAMPLE_IDENTIFIER)
2515                 result += sizeof(u64);
2516 
2517         if (type & PERF_SAMPLE_IP)
2518                 result += sizeof(u64);
2519 
2520         if (type & PERF_SAMPLE_TID)
2521                 result += sizeof(u64);
2522 
2523         if (type & PERF_SAMPLE_TIME)
2524                 result += sizeof(u64);
2525 
2526         if (type & PERF_SAMPLE_ADDR)
2527                 result += sizeof(u64);
2528 
2529         if (type & PERF_SAMPLE_ID)
2530                 result += sizeof(u64);
2531 
2532         if (type & PERF_SAMPLE_STREAM_ID)
2533                 result += sizeof(u64);
2534 
2535         if (type & PERF_SAMPLE_CPU)
2536                 result += sizeof(u64);
2537 
2538         if (type & PERF_SAMPLE_PERIOD)
2539                 result += sizeof(u64);
2540 
2541         if (type & PERF_SAMPLE_READ) {
2542                 result += sizeof(u64);
2543                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED)
2544                         result += sizeof(u64);
2545                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING)
2546                         result += sizeof(u64);
2547                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2548                 if (read_format & PERF_FORMAT_GROUP) {
2549                         sz = sample->read.group.nr *
2550                              sizeof(struct sample_read_value);
2551                         result += sz;
2552                 } else {
2553                         result += sizeof(u64);
2554                 }
2555         }
2556 
2557         if (type & PERF_SAMPLE_CALLCHAIN) {
2558                 sz = (sample->callchain->nr + 1) * sizeof(u64);
2559                 result += sz;
2560         }
2561 
2562         if (type & PERF_SAMPLE_RAW) {
2563                 result += sizeof(u32);
2564                 result += sample->raw_size;
2565         }
2566 
2567         if (type & PERF_SAMPLE_BRANCH_STACK) {
2568                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2569                 sz += sizeof(u64);
2570                 result += sz;
2571         }
2572 
2573         if (type & PERF_SAMPLE_REGS_USER) {
2574                 if (sample->user_regs.abi) {
2575                         result += sizeof(u64);
2576                         sz = hweight64(sample->user_regs.mask) * sizeof(u64);
2577                         result += sz;
2578                 } else {
2579                         result += sizeof(u64);
2580                 }
2581         }
2582 
2583         if (type & PERF_SAMPLE_STACK_USER) {
2584                 sz = sample->user_stack.size;
2585                 result += sizeof(u64);
2586                 if (sz) {
2587                         result += sz;
2588                         result += sizeof(u64);
2589                 }
2590         }
2591 
2592         if (type & PERF_SAMPLE_WEIGHT)
2593                 result += sizeof(u64);
2594 
2595         if (type & PERF_SAMPLE_DATA_SRC)
2596                 result += sizeof(u64);
2597 
2598         if (type & PERF_SAMPLE_TRANSACTION)
2599                 result += sizeof(u64);
2600 
2601         if (type & PERF_SAMPLE_REGS_INTR) {
2602                 if (sample->intr_regs.abi) {
2603                         result += sizeof(u64);
2604                         sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
2605                         result += sz;
2606                 } else {
2607                         result += sizeof(u64);
2608                 }
2609         }
2610 
2611         if (type & PERF_SAMPLE_PHYS_ADDR)
2612                 result += sizeof(u64);
2613 
2614         return result;
2615 }
2616 
2617 int perf_event__synthesize_sample(union perf_event *event, u64 type,
2618                                   u64 read_format,
2619                                   const struct perf_sample *sample)
2620 {
2621         u64 *array;
2622         size_t sz;
2623         /*
2624          * used for cross-endian analysis. See git commit 65014ab3
2625          * for why this goofiness is needed.
2626          */
2627         union u64_swap u;
2628 
2629         array = event->sample.array;
2630 
2631         if (type & PERF_SAMPLE_IDENTIFIER) {
2632                 *array = sample->id;
2633                 array++;
2634         }
2635 
2636         if (type & PERF_SAMPLE_IP) {
2637                 *array = sample->ip;
2638                 array++;
2639         }
2640 
2641         if (type & PERF_SAMPLE_TID) {
2642                 u.val32[0] = sample->pid;
2643                 u.val32[1] = sample->tid;
2644                 *array = u.val64;
2645                 array++;
2646         }
2647 
2648         if (type & PERF_SAMPLE_TIME) {
2649                 *array = sample->time;
2650                 array++;
2651         }
2652 
2653         if (type & PERF_SAMPLE_ADDR) {
2654                 *array = sample->addr;
2655                 array++;
2656         }
2657 
2658         if (type & PERF_SAMPLE_ID) {
2659                 *array = sample->id;
2660                 array++;
2661         }
2662 
2663         if (type & PERF_SAMPLE_STREAM_ID) {
2664                 *array = sample->stream_id;
2665                 array++;
2666         }
2667 
2668         if (type & PERF_SAMPLE_CPU) {
2669                 u.val32[0] = sample->cpu;
2670                 u.val32[1] = 0;
2671                 *array = u.val64;
2672                 array++;
2673         }
2674 
2675         if (type & PERF_SAMPLE_PERIOD) {
2676                 *array = sample->period;
2677                 array++;
2678         }
2679 
2680         if (type & PERF_SAMPLE_READ) {
2681                 if (read_format & PERF_FORMAT_GROUP)
2682                         *array = sample->read.group.nr;
2683                 else
2684                         *array = sample->read.one.value;
2685                 array++;
2686 
2687                 if (read_format & PERF_FORMAT_TOTAL_TIME_ENABLED) {
2688                         *array = sample->read.time_enabled;
2689                         array++;
2690                 }
2691 
2692                 if (read_format & PERF_FORMAT_TOTAL_TIME_RUNNING) {
2693                         *array = sample->read.time_running;
2694                         array++;
2695                 }
2696 
2697                 /* PERF_FORMAT_ID is forced for PERF_SAMPLE_READ */
2698                 if (read_format & PERF_FORMAT_GROUP) {
2699                         sz = sample->read.group.nr *
2700                              sizeof(struct sample_read_value);
2701                         memcpy(array, sample->read.group.values, sz);
2702                         array = (void *)array + sz;
2703                 } else {
2704                         *array = sample->read.one.id;
2705                         array++;
2706                 }
2707         }
2708 
2709         if (type & PERF_SAMPLE_CALLCHAIN) {
2710                 sz = (sample->callchain->nr + 1) * sizeof(u64);
2711                 memcpy(array, sample->callchain, sz);
2712                 array = (void *)array + sz;
2713         }
2714 
2715         if (type & PERF_SAMPLE_RAW) {
2716                 u.val32[0] = sample->raw_size;
2717                 *array = u.val64;
2718                 array = (void *)array + sizeof(u32);
2719 
2720                 memcpy(array, sample->raw_data, sample->raw_size);
2721                 array = (void *)array + sample->raw_size;
2722         }
2723 
2724         if (type & PERF_SAMPLE_BRANCH_STACK) {
2725                 sz = sample->branch_stack->nr * sizeof(struct branch_entry);
2726                 sz += sizeof(u64);
2727                 memcpy(array, sample->branch_stack, sz);
2728                 array = (void *)array + sz;
2729         }
2730 
2731         if (type & PERF_SAMPLE_REGS_USER) {
2732                 if (sample->user_regs.abi) {
2733                         *array++ = sample->user_regs.abi;
2734                         sz = hweight64(sample->user_regs.mask) * sizeof(u64);
2735                         memcpy(array, sample->user_regs.regs, sz);
2736                         array = (void *)array + sz;
2737                 } else {
2738                         *array++ = 0;
2739                 }
2740         }
2741 
2742         if (type & PERF_SAMPLE_STACK_USER) {
2743                 sz = sample->user_stack.size;
2744                 *array++ = sz;
2745                 if (sz) {
2746                         memcpy(array, sample->user_stack.data, sz);
2747                         array = (void *)array + sz;
2748                         *array++ = sz;
2749                 }
2750         }
2751 
2752         if (type & PERF_SAMPLE_WEIGHT) {
2753                 *array = sample->weight;
2754                 array++;
2755         }
2756 
2757         if (type & PERF_SAMPLE_DATA_SRC) {
2758                 *array = sample->data_src;
2759                 array++;
2760         }
2761 
2762         if (type & PERF_SAMPLE_TRANSACTION) {
2763                 *array = sample->transaction;
2764                 array++;
2765         }
2766 
2767         if (type & PERF_SAMPLE_REGS_INTR) {
2768                 if (sample->intr_regs.abi) {
2769                         *array++ = sample->intr_regs.abi;
2770                         sz = hweight64(sample->intr_regs.mask) * sizeof(u64);
2771                         memcpy(array, sample->intr_regs.regs, sz);
2772                         array = (void *)array + sz;
2773                 } else {
2774                         *array++ = 0;
2775                 }
2776         }
2777 
2778         if (type & PERF_SAMPLE_PHYS_ADDR) {
2779                 *array = sample->phys_addr;
2780                 array++;
2781         }
2782 
2783         return 0;
2784 }
2785 
2786 struct tep_format_field *perf_evsel__field(struct perf_evsel *evsel, const char *name)
2787 {
2788         return tep_find_field(evsel->tp_format, name);
2789 }
2790 
2791 void *perf_evsel__rawptr(struct perf_evsel *evsel, struct perf_sample *sample,
2792                          const char *name)
2793 {
2794         struct tep_format_field *field = perf_evsel__field(evsel, name);
2795         int offset;
2796 
2797         if (!field)
2798                 return NULL;
2799 
2800         offset = field->offset;
2801 
2802         if (field->flags & TEP_FIELD_IS_DYNAMIC) {
2803                 offset = *(int *)(sample->raw_data + field->offset);
2804                 offset &= 0xffff;
2805         }
2806 
2807         return sample->raw_data + offset;
2808 }
2809 
2810 u64 format_field__intval(struct tep_format_field *field, struct perf_sample *sample,
2811                          bool needs_swap)
2812 {
2813         u64 value;
2814         void *ptr = sample->raw_data + field->offset;
2815 
2816         switch (field->size) {
2817         case 1:
2818                 return *(u8 *)ptr;
2819         case 2:
2820                 value = *(u16 *)ptr;
2821                 break;
2822         case 4:
2823                 value = *(u32 *)ptr;
2824                 break;
2825         case 8:
2826                 memcpy(&value, ptr, sizeof(u64));
2827                 break;
2828         default:
2829                 return 0;
2830         }
2831 
2832         if (!needs_swap)
2833                 return value;
2834 
2835         switch (field->size) {
2836         case 2:
2837                 return bswap_16(value);
2838         case 4:
2839                 return bswap_32(value);
2840         case 8:
2841                 return bswap_64(value);
2842         default:
2843                 return 0;
2844         }
2845 
2846         return 0;
2847 }
2848 
2849 u64 perf_evsel__intval(struct perf_evsel *evsel, struct perf_sample *sample,
2850                        const char *name)
2851 {
2852         struct tep_format_field *field = perf_evsel__field(evsel, name);
2853 
2854         if (!field)
2855                 return 0;
2856 
2857         return field ? format_field__intval(field, sample, evsel->needs_swap) : 0;
2858 }
2859 
2860 bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
2861                           char *msg, size_t msgsize)
2862 {
2863         int paranoid;
2864 
2865         if ((err == ENOENT || err == ENXIO || err == ENODEV) &&
2866             evsel->attr.type   == PERF_TYPE_HARDWARE &&
2867             evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
2868                 /*
2869                  * If it's cycles then fall back to hrtimer based
2870                  * cpu-clock-tick sw counter, which is always available even if
2871                  * no PMU support.
2872                  *
2873                  * PPC returns ENXIO until 2.6.37 (behavior changed with commit
2874                  * b0a873e).
2875                  */
2876                 scnprintf(msg, msgsize, "%s",
2877 "The cycles event is not supported, trying to fall back to cpu-clock-ticks");
2878 
2879                 evsel->attr.type   = PERF_TYPE_SOFTWARE;
2880                 evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
2881 
2882                 zfree(&evsel->name);
2883                 return true;
2884         } else if (err == EACCES && !evsel->attr.exclude_kernel &&
2885                    (paranoid = perf_event_paranoid()) > 1) {
2886                 const char *name = perf_evsel__name(evsel);
2887                 char *new_name;
2888                 const char *sep = ":";
2889 
2890                 /* Is there already the separator in the name. */
2891                 if (strchr(name, '/') ||
2892                     strchr(name, ':'))
2893                         sep = "";
2894 
2895                 if (asprintf(&new_name, "%s%su", name, sep) < 0)
2896                         return false;
2897 
2898                 if (evsel->name)
2899                         free(evsel->name);
2900                 evsel->name = new_name;
2901                 scnprintf(msg, msgsize,
2902 "kernel.perf_event_paranoid=%d, trying to fall back to excluding kernel samples", paranoid);
2903                 evsel->attr.exclude_kernel = 1;
2904 
2905                 return true;
2906         }
2907 
2908         return false;
2909 }
2910 
2911 static bool find_process(const char *name)
2912 {
2913         size_t len = strlen(name);
2914         DIR *dir;
2915         struct dirent *d;
2916         int ret = -1;
2917 
2918         dir = opendir(procfs__mountpoint());
2919         if (!dir)
2920                 return false;
2921 
2922         /* Walk through the directory. */
2923         while (ret && (d = readdir(dir)) != NULL) {
2924                 char path[PATH_MAX];
2925                 char *data;
2926                 size_t size;
2927 
2928                 if ((d->d_type != DT_DIR) ||
2929                      !strcmp(".", d->d_name) ||
2930                      !strcmp("..", d->d_name))
2931                         continue;
2932 
2933                 scnprintf(path, sizeof(path), "%s/%s/comm",
2934                           procfs__mountpoint(), d->d_name);
2935 
2936                 if (filename__read_str(path, &data, &size))
2937                         continue;
2938 
2939                 ret = strncmp(name, data, len);
2940                 free(data);
2941         }
2942 
2943         closedir(dir);
2944         return ret ? false : true;
2945 }
2946 
2947 int perf_evsel__open_strerror(struct perf_evsel *evsel, struct target *target,
2948                               int err, char *msg, size_t size)
2949 {
2950         char sbuf[STRERR_BUFSIZE];
2951         int printed = 0;
2952 
2953         switch (err) {
2954         case EPERM:
2955         case EACCES:
2956                 if (err == EPERM)
2957                         printed = scnprintf(msg, size,
2958                                 "No permission to enable %s event.\n\n",
2959                                 perf_evsel__name(evsel));
2960 
2961                 return scnprintf(msg + printed, size - printed,
2962                  "You may not have permission to collect %sstats.\n\n"
2963                  "Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
2964                  "which controls use of the performance events system by\n"
2965                  "unprivileged users (without CAP_SYS_ADMIN).\n\n"
2966                  "The current value is %d:\n\n"
2967                  "  -1: Allow use of (almost) all events by all users\n"
2968                  "      Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
2969                  ">= 0: Disallow ftrace function tracepoint by users without CAP_SYS_ADMIN\n"
2970                  "      Disallow raw tracepoint access by users without CAP_SYS_ADMIN\n"
2971                  ">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
2972                  ">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN\n\n"
2973                  "To make this setting permanent, edit /etc/sysctl.conf too, e.g.:\n\n"
2974                  "      kernel.perf_event_paranoid = -1\n" ,
2975                                  target->system_wide ? "system-wide " : "",
2976                                  perf_event_paranoid());
2977         case ENOENT:
2978                 return scnprintf(msg, size, "The %s event is not supported.",
2979                                  perf_evsel__name(evsel));
2980         case EMFILE:
2981                 return scnprintf(msg, size, "%s",
2982                          "Too many events are opened.\n"
2983                          "Probably the maximum number of open file descriptors has been reached.\n"
2984                          "Hint: Try again after reducing the number of events.\n"
2985                          "Hint: Try increasing the limit with 'ulimit -n <limit>'");
2986         case ENOMEM:
2987                 if (evsel__has_callchain(evsel) &&
2988                     access("/proc/sys/kernel/perf_event_max_stack", F_OK) == 0)
2989                         return scnprintf(msg, size,
2990                                          "Not enough memory to setup event with callchain.\n"
2991                                          "Hint: Try tweaking /proc/sys/kernel/perf_event_max_stack\n"
2992                                          "Hint: Current value: %d", sysctl__max_stack());
2993                 break;
2994         case ENODEV:
2995                 if (target->cpu_list)
2996                         return scnprintf(msg, size, "%s",
2997          "No such device - did you specify an out-of-range profile CPU?");
2998                 break;
2999         case EOPNOTSUPP:
3000                 if (evsel->attr.sample_period != 0)
3001                         return scnprintf(msg, size,
3002         "%s: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'",
3003                                          perf_evsel__name(evsel));
3004                 if (evsel->attr.precise_ip)
3005                         return scnprintf(msg, size, "%s",
3006         "\'precise\' request may not be supported. Try removing 'p' modifier.");
3007 #if defined(__i386__) || defined(__x86_64__)
3008                 if (evsel->attr.type == PERF_TYPE_HARDWARE)
3009                         return scnprintf(msg, size, "%s",
3010         "No hardware sampling interrupt available.\n");
3011 #endif
3012                 break;
3013         case EBUSY:
3014                 if (find_process("oprofiled"))
3015                         return scnprintf(msg, size,
3016         "The PMU counters are busy/taken by another profiler.\n"
3017         "We found oprofile daemon running, please stop it and try again.");
3018                 break;
3019         case EINVAL:
3020                 if (evsel->attr.write_backward && perf_missing_features.write_backward)
3021                         return scnprintf(msg, size, "Reading from overwrite event is not supported by this kernel.");
3022                 if (perf_missing_features.clockid)
3023                         return scnprintf(msg, size, "clockid feature not supported.");
3024                 if (perf_missing_features.clockid_wrong)
3025                         return scnprintf(msg, size, "wrong clockid (%d).", clockid);
3026                 break;
3027         default:
3028                 break;
3029         }
3030 
3031         return scnprintf(msg, size,
3032         "The sys_perf_event_open() syscall returned with %d (%s) for event (%s).\n"
3033         "/bin/dmesg | grep -i perf may provide additional information.\n",
3034                          err, str_error_r(err, sbuf, sizeof(sbuf)),
3035                          perf_evsel__name(evsel));
3036 }
3037 
3038 struct perf_env *perf_evsel__env(struct perf_evsel *evsel)
3039 {
3040         if (evsel && evsel->evlist)
3041                 return evsel->evlist->env;
3042         return NULL;
3043 }
3044 
3045 static int store_evsel_ids(struct perf_evsel *evsel, struct perf_evlist *evlist)
3046 {
3047         int cpu, thread;
3048 
3049         for (cpu = 0; cpu < xyarray__max_x(evsel->fd); cpu++) {
3050                 for (thread = 0; thread < xyarray__max_y(evsel->fd);
3051                      thread++) {
3052                         int fd = FD(evsel, cpu, thread);
3053 
3054                         if (perf_evlist__id_add_fd(evlist, evsel,
3055                                                    cpu, thread, fd) < 0)
3056                                 return -1;
3057                 }
3058         }
3059 
3060         return 0;
3061 }
3062 
3063 int perf_evsel__store_ids(struct perf_evsel *evsel, struct perf_evlist *evlist)
3064 {
3065         struct cpu_map *cpus = evsel->cpus;
3066         struct thread_map *threads = evsel->threads;
3067 
3068         if (perf_evsel__alloc_id(evsel, cpus->nr, threads->nr))
3069                 return -ENOMEM;
3070 
3071         return store_evsel_ids(evsel, evlist);
3072 }
3073 

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