Commit | Line | Data |
---|---|---|
94c744b6 ACM |
1 | #include <linux/kernel.h> |
2 | ||
ba21594c | 3 | #include <byteswap.h> |
94c744b6 ACM |
4 | #include <unistd.h> |
5 | #include <sys/types.h> | |
6 | ||
7 | #include "session.h" | |
a328626b | 8 | #include "sort.h" |
94c744b6 ACM |
9 | #include "util.h" |
10 | ||
11 | static int perf_session__open(struct perf_session *self, bool force) | |
12 | { | |
13 | struct stat input_stat; | |
14 | ||
15 | self->fd = open(self->filename, O_RDONLY); | |
16 | if (self->fd < 0) { | |
17 | pr_err("failed to open file: %s", self->filename); | |
18 | if (!strcmp(self->filename, "perf.data")) | |
19 | pr_err(" (try 'perf record' first)"); | |
20 | pr_err("\n"); | |
21 | return -errno; | |
22 | } | |
23 | ||
24 | if (fstat(self->fd, &input_stat) < 0) | |
25 | goto out_close; | |
26 | ||
27 | if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) { | |
28 | pr_err("file %s not owned by current user or root\n", | |
29 | self->filename); | |
30 | goto out_close; | |
31 | } | |
32 | ||
33 | if (!input_stat.st_size) { | |
34 | pr_info("zero-sized file (%s), nothing to do!\n", | |
35 | self->filename); | |
36 | goto out_close; | |
37 | } | |
38 | ||
39 | if (perf_header__read(&self->header, self->fd) < 0) { | |
40 | pr_err("incompatible file format"); | |
41 | goto out_close; | |
42 | } | |
43 | ||
44 | self->size = input_stat.st_size; | |
45 | return 0; | |
46 | ||
47 | out_close: | |
48 | close(self->fd); | |
49 | self->fd = -1; | |
50 | return -1; | |
51 | } | |
52 | ||
75be6cf4 | 53 | struct perf_session *perf_session__new(const char *filename, int mode, bool force) |
94c744b6 | 54 | { |
b3165f41 | 55 | size_t len = filename ? strlen(filename) + 1 : 0; |
94c744b6 ACM |
56 | struct perf_session *self = zalloc(sizeof(*self) + len); |
57 | ||
58 | if (self == NULL) | |
59 | goto out; | |
60 | ||
61 | if (perf_header__init(&self->header) < 0) | |
4aa65636 | 62 | goto out_free; |
94c744b6 ACM |
63 | |
64 | memcpy(self->filename, filename, len); | |
b3165f41 ACM |
65 | self->threads = RB_ROOT; |
66 | self->last_match = NULL; | |
ec913369 ACM |
67 | self->mmap_window = 32; |
68 | self->cwd = NULL; | |
69 | self->cwdlen = 0; | |
31d337c4 | 70 | self->unknown_events = 0; |
4aa65636 | 71 | map_groups__init(&self->kmaps); |
94c744b6 | 72 | |
4aa65636 ACM |
73 | if (mode == O_RDONLY && perf_session__open(self, force) < 0) |
74 | goto out_delete; | |
d549c769 ACM |
75 | |
76 | self->sample_type = perf_header__sample_type(&self->header); | |
94c744b6 ACM |
77 | out: |
78 | return self; | |
4aa65636 | 79 | out_free: |
94c744b6 ACM |
80 | free(self); |
81 | return NULL; | |
4aa65636 ACM |
82 | out_delete: |
83 | perf_session__delete(self); | |
84 | return NULL; | |
94c744b6 ACM |
85 | } |
86 | ||
87 | void perf_session__delete(struct perf_session *self) | |
88 | { | |
89 | perf_header__exit(&self->header); | |
90 | close(self->fd); | |
ec913369 | 91 | free(self->cwd); |
94c744b6 ACM |
92 | free(self); |
93 | } | |
a328626b ACM |
94 | |
95 | static bool symbol__match_parent_regex(struct symbol *sym) | |
96 | { | |
97 | if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0)) | |
98 | return 1; | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | struct symbol **perf_session__resolve_callchain(struct perf_session *self, | |
104 | struct thread *thread, | |
105 | struct ip_callchain *chain, | |
106 | struct symbol **parent) | |
107 | { | |
108 | u8 cpumode = PERF_RECORD_MISC_USER; | |
109 | struct symbol **syms = NULL; | |
110 | unsigned int i; | |
111 | ||
d599db3f | 112 | if (symbol_conf.use_callchain) { |
a328626b ACM |
113 | syms = calloc(chain->nr, sizeof(*syms)); |
114 | if (!syms) { | |
115 | fprintf(stderr, "Can't allocate memory for symbols\n"); | |
116 | exit(-1); | |
117 | } | |
118 | } | |
119 | ||
120 | for (i = 0; i < chain->nr; i++) { | |
121 | u64 ip = chain->ips[i]; | |
122 | struct addr_location al; | |
123 | ||
124 | if (ip >= PERF_CONTEXT_MAX) { | |
125 | switch (ip) { | |
126 | case PERF_CONTEXT_HV: | |
127 | cpumode = PERF_RECORD_MISC_HYPERVISOR; break; | |
128 | case PERF_CONTEXT_KERNEL: | |
129 | cpumode = PERF_RECORD_MISC_KERNEL; break; | |
130 | case PERF_CONTEXT_USER: | |
131 | cpumode = PERF_RECORD_MISC_USER; break; | |
132 | default: | |
133 | break; | |
134 | } | |
135 | continue; | |
136 | } | |
137 | ||
138 | thread__find_addr_location(thread, self, cpumode, | |
139 | MAP__FUNCTION, ip, &al, NULL); | |
140 | if (al.sym != NULL) { | |
141 | if (sort__has_parent && !*parent && | |
142 | symbol__match_parent_regex(al.sym)) | |
143 | *parent = al.sym; | |
d599db3f | 144 | if (!symbol_conf.use_callchain) |
a328626b ACM |
145 | break; |
146 | syms[i] = al.sym; | |
147 | } | |
148 | } | |
149 | ||
150 | return syms; | |
151 | } | |
06aae590 ACM |
152 | |
153 | static int process_event_stub(event_t *event __used, | |
154 | struct perf_session *session __used) | |
155 | { | |
156 | dump_printf(": unhandled!\n"); | |
157 | return 0; | |
158 | } | |
159 | ||
160 | static void perf_event_ops__fill_defaults(struct perf_event_ops *handler) | |
161 | { | |
55aa640f ACM |
162 | if (handler->sample == NULL) |
163 | handler->sample = process_event_stub; | |
164 | if (handler->mmap == NULL) | |
165 | handler->mmap = process_event_stub; | |
166 | if (handler->comm == NULL) | |
167 | handler->comm = process_event_stub; | |
168 | if (handler->fork == NULL) | |
169 | handler->fork = process_event_stub; | |
170 | if (handler->exit == NULL) | |
171 | handler->exit = process_event_stub; | |
172 | if (handler->lost == NULL) | |
173 | handler->lost = process_event_stub; | |
174 | if (handler->read == NULL) | |
175 | handler->read = process_event_stub; | |
176 | if (handler->throttle == NULL) | |
177 | handler->throttle = process_event_stub; | |
178 | if (handler->unthrottle == NULL) | |
179 | handler->unthrottle = process_event_stub; | |
06aae590 ACM |
180 | } |
181 | ||
182 | static const char *event__name[] = { | |
183 | [0] = "TOTAL", | |
184 | [PERF_RECORD_MMAP] = "MMAP", | |
185 | [PERF_RECORD_LOST] = "LOST", | |
186 | [PERF_RECORD_COMM] = "COMM", | |
187 | [PERF_RECORD_EXIT] = "EXIT", | |
188 | [PERF_RECORD_THROTTLE] = "THROTTLE", | |
189 | [PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE", | |
190 | [PERF_RECORD_FORK] = "FORK", | |
191 | [PERF_RECORD_READ] = "READ", | |
192 | [PERF_RECORD_SAMPLE] = "SAMPLE", | |
193 | }; | |
194 | ||
195 | unsigned long event__total[PERF_RECORD_MAX]; | |
196 | ||
197 | void event__print_totals(void) | |
198 | { | |
199 | int i; | |
200 | for (i = 0; i < PERF_RECORD_MAX; ++i) | |
201 | pr_info("%10s events: %10ld\n", | |
202 | event__name[i], event__total[i]); | |
203 | } | |
204 | ||
ba21594c ACM |
205 | void mem_bswap_64(void *src, int byte_size) |
206 | { | |
207 | u64 *m = src; | |
208 | ||
209 | while (byte_size > 0) { | |
210 | *m = bswap_64(*m); | |
211 | byte_size -= sizeof(u64); | |
212 | ++m; | |
213 | } | |
214 | } | |
215 | ||
216 | static void event__all64_swap(event_t *self) | |
217 | { | |
218 | struct perf_event_header *hdr = &self->header; | |
219 | mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr)); | |
220 | } | |
221 | ||
222 | static void event__comm_swap(event_t *self) | |
223 | { | |
224 | self->comm.pid = bswap_32(self->comm.pid); | |
225 | self->comm.tid = bswap_32(self->comm.tid); | |
226 | } | |
227 | ||
228 | static void event__mmap_swap(event_t *self) | |
229 | { | |
230 | self->mmap.pid = bswap_32(self->mmap.pid); | |
231 | self->mmap.tid = bswap_32(self->mmap.tid); | |
232 | self->mmap.start = bswap_64(self->mmap.start); | |
233 | self->mmap.len = bswap_64(self->mmap.len); | |
234 | self->mmap.pgoff = bswap_64(self->mmap.pgoff); | |
235 | } | |
236 | ||
237 | static void event__task_swap(event_t *self) | |
238 | { | |
239 | self->fork.pid = bswap_32(self->fork.pid); | |
240 | self->fork.tid = bswap_32(self->fork.tid); | |
241 | self->fork.ppid = bswap_32(self->fork.ppid); | |
242 | self->fork.ptid = bswap_32(self->fork.ptid); | |
243 | self->fork.time = bswap_64(self->fork.time); | |
244 | } | |
245 | ||
246 | static void event__read_swap(event_t *self) | |
247 | { | |
248 | self->read.pid = bswap_32(self->read.pid); | |
249 | self->read.tid = bswap_32(self->read.tid); | |
250 | self->read.value = bswap_64(self->read.value); | |
251 | self->read.time_enabled = bswap_64(self->read.time_enabled); | |
252 | self->read.time_running = bswap_64(self->read.time_running); | |
253 | self->read.id = bswap_64(self->read.id); | |
254 | } | |
255 | ||
256 | typedef void (*event__swap_op)(event_t *self); | |
257 | ||
258 | static event__swap_op event__swap_ops[] = { | |
259 | [PERF_RECORD_MMAP] = event__mmap_swap, | |
260 | [PERF_RECORD_COMM] = event__comm_swap, | |
261 | [PERF_RECORD_FORK] = event__task_swap, | |
262 | [PERF_RECORD_EXIT] = event__task_swap, | |
263 | [PERF_RECORD_LOST] = event__all64_swap, | |
264 | [PERF_RECORD_READ] = event__read_swap, | |
265 | [PERF_RECORD_SAMPLE] = event__all64_swap, | |
266 | [PERF_RECORD_MAX] = NULL, | |
267 | }; | |
268 | ||
06aae590 ACM |
269 | static int perf_session__process_event(struct perf_session *self, |
270 | event_t *event, | |
271 | struct perf_event_ops *ops, | |
ba21594c | 272 | u64 offset, u64 head) |
06aae590 ACM |
273 | { |
274 | trace_event(event); | |
275 | ||
276 | if (event->header.type < PERF_RECORD_MAX) { | |
ba21594c | 277 | dump_printf("%#Lx [%#x]: PERF_RECORD_%s", |
0d755034 | 278 | offset + head, event->header.size, |
06aae590 ACM |
279 | event__name[event->header.type]); |
280 | ++event__total[0]; | |
281 | ++event__total[event->header.type]; | |
282 | } | |
283 | ||
ba21594c ACM |
284 | if (self->header.needs_swap && event__swap_ops[event->header.type]) |
285 | event__swap_ops[event->header.type](event); | |
286 | ||
06aae590 ACM |
287 | switch (event->header.type) { |
288 | case PERF_RECORD_SAMPLE: | |
55aa640f | 289 | return ops->sample(event, self); |
06aae590 | 290 | case PERF_RECORD_MMAP: |
55aa640f | 291 | return ops->mmap(event, self); |
06aae590 | 292 | case PERF_RECORD_COMM: |
55aa640f | 293 | return ops->comm(event, self); |
06aae590 | 294 | case PERF_RECORD_FORK: |
55aa640f | 295 | return ops->fork(event, self); |
06aae590 | 296 | case PERF_RECORD_EXIT: |
55aa640f | 297 | return ops->exit(event, self); |
06aae590 | 298 | case PERF_RECORD_LOST: |
55aa640f | 299 | return ops->lost(event, self); |
06aae590 | 300 | case PERF_RECORD_READ: |
55aa640f | 301 | return ops->read(event, self); |
06aae590 | 302 | case PERF_RECORD_THROTTLE: |
55aa640f | 303 | return ops->throttle(event, self); |
06aae590 | 304 | case PERF_RECORD_UNTHROTTLE: |
55aa640f | 305 | return ops->unthrottle(event, self); |
06aae590 | 306 | default: |
31d337c4 | 307 | self->unknown_events++; |
06aae590 ACM |
308 | return -1; |
309 | } | |
310 | } | |
311 | ||
ba21594c ACM |
312 | void perf_event_header__bswap(struct perf_event_header *self) |
313 | { | |
314 | self->type = bswap_32(self->type); | |
315 | self->misc = bswap_16(self->misc); | |
316 | self->size = bswap_16(self->size); | |
317 | } | |
318 | ||
319 | int perf_header__read_build_ids(struct perf_header *self, | |
320 | int input, u64 offset, u64 size) | |
06aae590 ACM |
321 | { |
322 | struct build_id_event bev; | |
323 | char filename[PATH_MAX]; | |
324 | u64 limit = offset + size; | |
325 | int err = -1; | |
326 | ||
327 | while (offset < limit) { | |
328 | struct dso *dso; | |
329 | ssize_t len; | |
a89e5abe | 330 | struct list_head *head = &dsos__user; |
06aae590 ACM |
331 | |
332 | if (read(input, &bev, sizeof(bev)) != sizeof(bev)) | |
333 | goto out; | |
334 | ||
ba21594c ACM |
335 | if (self->needs_swap) |
336 | perf_event_header__bswap(&bev.header); | |
337 | ||
06aae590 ACM |
338 | len = bev.header.size - sizeof(bev); |
339 | if (read(input, filename, len) != len) | |
340 | goto out; | |
341 | ||
a89e5abe ACM |
342 | if (bev.header.misc & PERF_RECORD_MISC_KERNEL) |
343 | head = &dsos__kernel; | |
344 | ||
345 | dso = __dsos__findnew(head, filename); | |
b7cece76 | 346 | if (dso != NULL) { |
06aae590 | 347 | dso__set_build_id(dso, &bev.build_id); |
b7cece76 ACM |
348 | if (head == &dsos__kernel && filename[0] == '[') |
349 | dso->kernel = 1; | |
350 | } | |
06aae590 ACM |
351 | |
352 | offset += bev.header.size; | |
353 | } | |
354 | err = 0; | |
355 | out: | |
356 | return err; | |
357 | } | |
358 | ||
359 | static struct thread *perf_session__register_idle_thread(struct perf_session *self) | |
360 | { | |
361 | struct thread *thread = perf_session__findnew(self, 0); | |
362 | ||
363 | if (thread == NULL || thread__set_comm(thread, "swapper")) { | |
364 | pr_err("problem inserting idle task.\n"); | |
365 | thread = NULL; | |
366 | } | |
367 | ||
368 | return thread; | |
369 | } | |
370 | ||
371 | int perf_session__process_events(struct perf_session *self, | |
372 | struct perf_event_ops *ops) | |
373 | { | |
ba21594c ACM |
374 | int err, mmap_prot, mmap_flags; |
375 | u64 head, shift; | |
376 | u64 offset = 0; | |
06aae590 ACM |
377 | size_t page_size; |
378 | event_t *event; | |
379 | uint32_t size; | |
380 | char *buf; | |
381 | ||
382 | if (perf_session__register_idle_thread(self) == NULL) | |
383 | return -ENOMEM; | |
384 | ||
385 | perf_event_ops__fill_defaults(ops); | |
386 | ||
1b75962e | 387 | page_size = sysconf(_SC_PAGESIZE); |
06aae590 ACM |
388 | |
389 | head = self->header.data_offset; | |
06aae590 | 390 | |
f7d87444 | 391 | if (!symbol_conf.full_paths) { |
06aae590 ACM |
392 | char bf[PATH_MAX]; |
393 | ||
394 | if (getcwd(bf, sizeof(bf)) == NULL) { | |
395 | err = -errno; | |
396 | out_getcwd_err: | |
397 | pr_err("failed to get the current directory\n"); | |
398 | goto out_err; | |
399 | } | |
400 | self->cwd = strdup(bf); | |
401 | if (self->cwd == NULL) { | |
402 | err = -ENOMEM; | |
403 | goto out_getcwd_err; | |
404 | } | |
405 | self->cwdlen = strlen(self->cwd); | |
406 | } | |
407 | ||
408 | shift = page_size * (head / page_size); | |
409 | offset += shift; | |
410 | head -= shift; | |
411 | ||
ba21594c ACM |
412 | mmap_prot = PROT_READ; |
413 | mmap_flags = MAP_SHARED; | |
414 | ||
415 | if (self->header.needs_swap) { | |
416 | mmap_prot |= PROT_WRITE; | |
417 | mmap_flags = MAP_PRIVATE; | |
418 | } | |
06aae590 | 419 | remap: |
ba21594c ACM |
420 | buf = mmap(NULL, page_size * self->mmap_window, mmap_prot, |
421 | mmap_flags, self->fd, offset); | |
06aae590 ACM |
422 | if (buf == MAP_FAILED) { |
423 | pr_err("failed to mmap file\n"); | |
424 | err = -errno; | |
425 | goto out_err; | |
426 | } | |
427 | ||
428 | more: | |
429 | event = (event_t *)(buf + head); | |
430 | ||
ba21594c ACM |
431 | if (self->header.needs_swap) |
432 | perf_event_header__bswap(&event->header); | |
06aae590 ACM |
433 | size = event->header.size; |
434 | if (size == 0) | |
435 | size = 8; | |
436 | ||
437 | if (head + event->header.size >= page_size * self->mmap_window) { | |
438 | int munmap_ret; | |
439 | ||
440 | shift = page_size * (head / page_size); | |
441 | ||
442 | munmap_ret = munmap(buf, page_size * self->mmap_window); | |
443 | assert(munmap_ret == 0); | |
444 | ||
445 | offset += shift; | |
446 | head -= shift; | |
447 | goto remap; | |
448 | } | |
449 | ||
450 | size = event->header.size; | |
451 | ||
ba21594c | 452 | dump_printf("\n%#Lx [%#x]: event: %d\n", |
0d755034 | 453 | offset + head, event->header.size, event->header.type); |
06aae590 ACM |
454 | |
455 | if (size == 0 || | |
456 | perf_session__process_event(self, event, ops, offset, head) < 0) { | |
ba21594c | 457 | dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n", |
0d755034 | 458 | offset + head, event->header.size, |
06aae590 ACM |
459 | event->header.type); |
460 | /* | |
461 | * assume we lost track of the stream, check alignment, and | |
462 | * increment a single u64 in the hope to catch on again 'soon'. | |
463 | */ | |
464 | if (unlikely(head & 7)) | |
465 | head &= ~7ULL; | |
466 | ||
467 | size = 8; | |
468 | } | |
469 | ||
470 | head += size; | |
471 | ||
472 | if (offset + head >= self->header.data_offset + self->header.data_size) | |
473 | goto done; | |
474 | ||
475 | if (offset + head < self->size) | |
476 | goto more; | |
477 | done: | |
478 | err = 0; | |
479 | out_err: | |
480 | return err; | |
481 | } | |
27295592 | 482 | |
d549c769 | 483 | bool perf_session__has_traces(struct perf_session *self, const char *msg) |
27295592 ACM |
484 | { |
485 | if (!(self->sample_type & PERF_SAMPLE_RAW)) { | |
d549c769 ACM |
486 | pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg); |
487 | return false; | |
27295592 ACM |
488 | } |
489 | ||
d549c769 | 490 | return true; |
27295592 | 491 | } |
56b03f3c ACM |
492 | |
493 | int perf_session__set_kallsyms_ref_reloc_sym(struct perf_session *self, | |
494 | const char *symbol_name, | |
495 | u64 addr) | |
496 | { | |
497 | char *bracket; | |
498 | ||
499 | self->ref_reloc_sym.name = strdup(symbol_name); | |
500 | if (self->ref_reloc_sym.name == NULL) | |
501 | return -ENOMEM; | |
502 | ||
503 | bracket = strchr(self->ref_reloc_sym.name, ']'); | |
504 | if (bracket) | |
505 | *bracket = '\0'; | |
506 | ||
507 | self->ref_reloc_sym.addr = addr; | |
508 | return 0; | |
509 | } | |
510 | ||
511 | static u64 map__reloc_map_ip(struct map *map, u64 ip) | |
512 | { | |
513 | return ip + (s64)map->pgoff; | |
514 | } | |
515 | ||
516 | static u64 map__reloc_unmap_ip(struct map *map, u64 ip) | |
517 | { | |
518 | return ip - (s64)map->pgoff; | |
519 | } | |
520 | ||
521 | void perf_session__reloc_vmlinux_maps(struct perf_session *self, | |
522 | u64 unrelocated_addr) | |
523 | { | |
524 | enum map_type type; | |
525 | s64 reloc = unrelocated_addr - self->ref_reloc_sym.addr; | |
526 | ||
527 | if (!reloc) | |
528 | return; | |
529 | ||
530 | for (type = 0; type < MAP__NR_TYPES; ++type) { | |
531 | struct map *map = self->vmlinux_maps[type]; | |
532 | ||
533 | map->map_ip = map__reloc_map_ip; | |
534 | map->unmap_ip = map__reloc_unmap_ip; | |
535 | map->pgoff = reloc; | |
536 | } | |
537 | } |