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