1 #define _FILE_OFFSET_BITS 64
3 #include <linux/kernel.h>
13 static int perf_session__open(struct perf_session *self, bool force)
15 struct stat input_stat;
17 if (!strcmp(self->filename, "-")) {
19 self->fd = STDIN_FILENO;
21 if (perf_header__read(self, self->fd) < 0)
22 pr_err("incompatible file format");
27 self->fd = open(self->filename, O_RDONLY);
29 pr_err("failed to open file: %s", self->filename);
30 if (!strcmp(self->filename, "perf.data"))
31 pr_err(" (try 'perf record' first)");
36 if (fstat(self->fd, &input_stat) < 0)
39 if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
40 pr_err("file %s not owned by current user or root\n",
45 if (!input_stat.st_size) {
46 pr_info("zero-sized file (%s), nothing to do!\n",
51 if (perf_header__read(self, self->fd) < 0) {
52 pr_err("incompatible file format");
56 self->size = input_stat.st_size;
65 void perf_session__update_sample_type(struct perf_session *self)
67 self->sample_type = perf_header__sample_type(&self->header);
70 struct perf_session *perf_session__new(const char *filename, int mode, bool force)
72 size_t len = filename ? strlen(filename) + 1 : 0;
73 struct perf_session *self = zalloc(sizeof(*self) + len);
78 if (perf_header__init(&self->header) < 0)
81 memcpy(self->filename, filename, len);
82 self->threads = RB_ROOT;
83 self->stats_by_id = RB_ROOT;
84 self->last_match = NULL;
85 self->mmap_window = 32;
88 self->unknown_events = 0;
89 map_groups__init(&self->kmaps);
91 if (mode == O_RDONLY) {
92 if (perf_session__open(self, force) < 0)
94 } else if (mode == O_WRONLY) {
96 * In O_RDONLY mode this will be performed when reading the
97 * kernel MMAP event, in event__process_mmap().
99 if (perf_session__create_kernel_maps(self) < 0)
103 perf_session__update_sample_type(self);
110 perf_session__delete(self);
114 void perf_session__delete(struct perf_session *self)
116 perf_header__exit(&self->header);
122 static bool symbol__match_parent_regex(struct symbol *sym)
124 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
130 struct map_symbol *perf_session__resolve_callchain(struct perf_session *self,
131 struct thread *thread,
132 struct ip_callchain *chain,
133 struct symbol **parent)
135 u8 cpumode = PERF_RECORD_MISC_USER;
137 struct map_symbol *syms = calloc(chain->nr, sizeof(*syms));
142 for (i = 0; i < chain->nr; i++) {
143 u64 ip = chain->ips[i];
144 struct addr_location al;
146 if (ip >= PERF_CONTEXT_MAX) {
148 case PERF_CONTEXT_HV:
149 cpumode = PERF_RECORD_MISC_HYPERVISOR; break;
150 case PERF_CONTEXT_KERNEL:
151 cpumode = PERF_RECORD_MISC_KERNEL; break;
152 case PERF_CONTEXT_USER:
153 cpumode = PERF_RECORD_MISC_USER; break;
160 thread__find_addr_location(thread, self, cpumode,
161 MAP__FUNCTION, ip, &al, NULL);
162 if (al.sym != NULL) {
163 if (sort__has_parent && !*parent &&
164 symbol__match_parent_regex(al.sym))
166 if (!symbol_conf.use_callchain)
168 syms[i].map = al.map;
169 syms[i].sym = al.sym;
176 static int process_event_stub(event_t *event __used,
177 struct perf_session *session __used)
179 dump_printf(": unhandled!\n");
183 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
185 if (handler->sample == NULL)
186 handler->sample = process_event_stub;
187 if (handler->mmap == NULL)
188 handler->mmap = process_event_stub;
189 if (handler->comm == NULL)
190 handler->comm = process_event_stub;
191 if (handler->fork == NULL)
192 handler->fork = process_event_stub;
193 if (handler->exit == NULL)
194 handler->exit = process_event_stub;
195 if (handler->lost == NULL)
196 handler->lost = process_event_stub;
197 if (handler->read == NULL)
198 handler->read = process_event_stub;
199 if (handler->throttle == NULL)
200 handler->throttle = process_event_stub;
201 if (handler->unthrottle == NULL)
202 handler->unthrottle = process_event_stub;
203 if (handler->attr == NULL)
204 handler->attr = process_event_stub;
205 if (handler->event_type == NULL)
206 handler->event_type = process_event_stub;
207 if (handler->tracing_data == NULL)
208 handler->tracing_data = process_event_stub;
209 if (handler->build_id == NULL)
210 handler->build_id = process_event_stub;
213 static const char *event__name[] = {
215 [PERF_RECORD_MMAP] = "MMAP",
216 [PERF_RECORD_LOST] = "LOST",
217 [PERF_RECORD_COMM] = "COMM",
218 [PERF_RECORD_EXIT] = "EXIT",
219 [PERF_RECORD_THROTTLE] = "THROTTLE",
220 [PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
221 [PERF_RECORD_FORK] = "FORK",
222 [PERF_RECORD_READ] = "READ",
223 [PERF_RECORD_SAMPLE] = "SAMPLE",
224 [PERF_RECORD_HEADER_ATTR] = "ATTR",
225 [PERF_RECORD_HEADER_EVENT_TYPE] = "EVENT_TYPE",
226 [PERF_RECORD_HEADER_TRACING_DATA] = "TRACING_DATA",
227 [PERF_RECORD_HEADER_BUILD_ID] = "BUILD_ID",
230 unsigned long event__total[PERF_RECORD_HEADER_MAX];
232 void event__print_totals(void)
235 for (i = 0; i < PERF_RECORD_HEADER_MAX; ++i) {
238 pr_info("%10s events: %10ld\n",
239 event__name[i], event__total[i]);
243 void mem_bswap_64(void *src, int byte_size)
247 while (byte_size > 0) {
249 byte_size -= sizeof(u64);
254 static void event__all64_swap(event_t *self)
256 struct perf_event_header *hdr = &self->header;
257 mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr));
260 static void event__comm_swap(event_t *self)
262 self->comm.pid = bswap_32(self->comm.pid);
263 self->comm.tid = bswap_32(self->comm.tid);
266 static void event__mmap_swap(event_t *self)
268 self->mmap.pid = bswap_32(self->mmap.pid);
269 self->mmap.tid = bswap_32(self->mmap.tid);
270 self->mmap.start = bswap_64(self->mmap.start);
271 self->mmap.len = bswap_64(self->mmap.len);
272 self->mmap.pgoff = bswap_64(self->mmap.pgoff);
275 static void event__task_swap(event_t *self)
277 self->fork.pid = bswap_32(self->fork.pid);
278 self->fork.tid = bswap_32(self->fork.tid);
279 self->fork.ppid = bswap_32(self->fork.ppid);
280 self->fork.ptid = bswap_32(self->fork.ptid);
281 self->fork.time = bswap_64(self->fork.time);
284 static void event__read_swap(event_t *self)
286 self->read.pid = bswap_32(self->read.pid);
287 self->read.tid = bswap_32(self->read.tid);
288 self->read.value = bswap_64(self->read.value);
289 self->read.time_enabled = bswap_64(self->read.time_enabled);
290 self->read.time_running = bswap_64(self->read.time_running);
291 self->read.id = bswap_64(self->read.id);
294 static void event__attr_swap(event_t *self)
298 self->attr.attr.type = bswap_32(self->attr.attr.type);
299 self->attr.attr.size = bswap_32(self->attr.attr.size);
300 self->attr.attr.config = bswap_64(self->attr.attr.config);
301 self->attr.attr.sample_period = bswap_64(self->attr.attr.sample_period);
302 self->attr.attr.sample_type = bswap_64(self->attr.attr.sample_type);
303 self->attr.attr.read_format = bswap_64(self->attr.attr.read_format);
304 self->attr.attr.wakeup_events = bswap_32(self->attr.attr.wakeup_events);
305 self->attr.attr.bp_type = bswap_32(self->attr.attr.bp_type);
306 self->attr.attr.bp_addr = bswap_64(self->attr.attr.bp_addr);
307 self->attr.attr.bp_len = bswap_64(self->attr.attr.bp_len);
309 size = self->header.size;
310 size -= (void *)&self->attr.id - (void *)self;
311 mem_bswap_64(self->attr.id, size);
314 static void event__event_type_swap(event_t *self)
316 self->event_type.event_type.event_id =
317 bswap_64(self->event_type.event_type.event_id);
320 static void event__tracing_data_swap(event_t *self)
322 self->tracing_data.size = bswap_32(self->tracing_data.size);
325 typedef void (*event__swap_op)(event_t *self);
327 static event__swap_op event__swap_ops[] = {
328 [PERF_RECORD_MMAP] = event__mmap_swap,
329 [PERF_RECORD_COMM] = event__comm_swap,
330 [PERF_RECORD_FORK] = event__task_swap,
331 [PERF_RECORD_EXIT] = event__task_swap,
332 [PERF_RECORD_LOST] = event__all64_swap,
333 [PERF_RECORD_READ] = event__read_swap,
334 [PERF_RECORD_SAMPLE] = event__all64_swap,
335 [PERF_RECORD_HEADER_ATTR] = event__attr_swap,
336 [PERF_RECORD_HEADER_EVENT_TYPE] = event__event_type_swap,
337 [PERF_RECORD_HEADER_TRACING_DATA] = event__tracing_data_swap,
338 [PERF_RECORD_HEADER_BUILD_ID] = NULL,
339 [PERF_RECORD_HEADER_MAX] = NULL,
342 static int perf_session__process_event(struct perf_session *self,
344 struct perf_event_ops *ops,
345 u64 offset, u64 head)
349 if (event->header.type < PERF_RECORD_HEADER_MAX) {
350 dump_printf("%#Lx [%#x]: PERF_RECORD_%s",
351 offset + head, event->header.size,
352 event__name[event->header.type]);
354 ++event__total[event->header.type];
357 if (self->header.needs_swap && event__swap_ops[event->header.type])
358 event__swap_ops[event->header.type](event);
360 switch (event->header.type) {
361 case PERF_RECORD_SAMPLE:
362 return ops->sample(event, self);
363 case PERF_RECORD_MMAP:
364 return ops->mmap(event, self);
365 case PERF_RECORD_COMM:
366 return ops->comm(event, self);
367 case PERF_RECORD_FORK:
368 return ops->fork(event, self);
369 case PERF_RECORD_EXIT:
370 return ops->exit(event, self);
371 case PERF_RECORD_LOST:
372 return ops->lost(event, self);
373 case PERF_RECORD_READ:
374 return ops->read(event, self);
375 case PERF_RECORD_THROTTLE:
376 return ops->throttle(event, self);
377 case PERF_RECORD_UNTHROTTLE:
378 return ops->unthrottle(event, self);
379 case PERF_RECORD_HEADER_ATTR:
380 return ops->attr(event, self);
381 case PERF_RECORD_HEADER_EVENT_TYPE:
382 return ops->event_type(event, self);
383 case PERF_RECORD_HEADER_TRACING_DATA:
384 /* setup for reading amidst mmap */
385 lseek(self->fd, offset + head, SEEK_SET);
386 return ops->tracing_data(event, self);
387 case PERF_RECORD_HEADER_BUILD_ID:
388 return ops->build_id(event, self);
390 self->unknown_events++;
395 void perf_event_header__bswap(struct perf_event_header *self)
397 self->type = bswap_32(self->type);
398 self->misc = bswap_16(self->misc);
399 self->size = bswap_16(self->size);
402 int perf_header__read_build_ids(struct perf_header *self,
403 int input, u64 offset, u64 size)
405 struct build_id_event bev;
406 char filename[PATH_MAX];
407 u64 limit = offset + size;
410 while (offset < limit) {
413 struct list_head *head = &dsos__user;
415 if (read(input, &bev, sizeof(bev)) != sizeof(bev))
418 if (self->needs_swap)
419 perf_event_header__bswap(&bev.header);
421 len = bev.header.size - sizeof(bev);
422 if (read(input, filename, len) != len)
425 if (bev.header.misc & PERF_RECORD_MISC_KERNEL)
426 head = &dsos__kernel;
428 dso = __dsos__findnew(head, filename);
430 dso__set_build_id(dso, &bev.build_id);
431 if (head == &dsos__kernel && filename[0] == '[')
435 offset += bev.header.size;
442 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
444 struct thread *thread = perf_session__findnew(self, 0);
446 if (thread == NULL || thread__set_comm(thread, "swapper")) {
447 pr_err("problem inserting idle task.\n");
454 int do_read(int fd, void *buf, size_t size)
456 void *buf_start = buf;
459 int ret = read(fd, buf, size);
468 return buf - buf_start;
471 #define session_done() (*(volatile int *)(&session_done))
472 volatile int session_done;
474 static int __perf_session__process_pipe_events(struct perf_session *self,
475 struct perf_event_ops *ops)
484 perf_event_ops__fill_defaults(ops);
488 err = do_read(self->fd, &event, sizeof(struct perf_event_header));
493 pr_err("failed to read event header\n");
497 if (self->header.needs_swap)
498 perf_event_header__bswap(&event.header);
500 size = event.header.size;
505 p += sizeof(struct perf_event_header);
507 err = do_read(self->fd, p, size - sizeof(struct perf_event_header));
510 pr_err("unexpected end of event stream\n");
514 pr_err("failed to read event data\n");
519 (skip = perf_session__process_event(self, &event, ops,
521 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
522 head, event.header.size, event.header.type);
524 * assume we lost track of the stream, check alignment, and
525 * increment a single u64 in the hope to catch on again 'soon'.
527 if (unlikely(head & 7))
535 dump_printf("\n%#Lx [%#x]: event: %d\n",
536 head, event.header.size, event.header.type);
549 int __perf_session__process_events(struct perf_session *self,
550 u64 data_offset, u64 data_size,
551 u64 file_size, struct perf_event_ops *ops)
553 int err, mmap_prot, mmap_flags;
560 struct ui_progress *progress = ui_progress__new("Processing events...",
562 if (progress == NULL)
565 perf_event_ops__fill_defaults(ops);
567 page_size = sysconf(_SC_PAGESIZE);
570 shift = page_size * (head / page_size);
574 mmap_prot = PROT_READ;
575 mmap_flags = MAP_SHARED;
577 if (self->header.needs_swap) {
578 mmap_prot |= PROT_WRITE;
579 mmap_flags = MAP_PRIVATE;
582 buf = mmap(NULL, page_size * self->mmap_window, mmap_prot,
583 mmap_flags, self->fd, offset);
584 if (buf == MAP_FAILED) {
585 pr_err("failed to mmap file\n");
591 event = (event_t *)(buf + head);
592 ui_progress__update(progress, offset);
594 if (self->header.needs_swap)
595 perf_event_header__bswap(&event->header);
596 size = event->header.size;
600 if (head + event->header.size >= page_size * self->mmap_window) {
603 shift = page_size * (head / page_size);
605 munmap_ret = munmap(buf, page_size * self->mmap_window);
606 assert(munmap_ret == 0);
613 size = event->header.size;
615 dump_printf("\n%#Lx [%#x]: event: %d\n",
616 offset + head, event->header.size, event->header.type);
619 perf_session__process_event(self, event, ops, offset, head) < 0) {
620 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
621 offset + head, event->header.size,
624 * assume we lost track of the stream, check alignment, and
625 * increment a single u64 in the hope to catch on again 'soon'.
627 if (unlikely(head & 7))
635 if (offset + head >= data_offset + data_size)
638 if (offset + head < file_size)
643 ui_progress__delete(progress);
647 int perf_session__process_events(struct perf_session *self,
648 struct perf_event_ops *ops)
652 if (perf_session__register_idle_thread(self) == NULL)
655 if (!symbol_conf.full_paths) {
658 if (getcwd(bf, sizeof(bf)) == NULL) {
661 pr_err("failed to get the current directory\n");
664 self->cwd = strdup(bf);
665 if (self->cwd == NULL) {
669 self->cwdlen = strlen(self->cwd);
673 err = __perf_session__process_events(self,
674 self->header.data_offset,
675 self->header.data_size,
678 err = __perf_session__process_pipe_events(self, ops);
683 bool perf_session__has_traces(struct perf_session *self, const char *msg)
685 if (!(self->sample_type & PERF_SAMPLE_RAW)) {
686 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
693 int perf_session__set_kallsyms_ref_reloc_sym(struct perf_session *self,
694 const char *symbol_name,
700 self->ref_reloc_sym.name = strdup(symbol_name);
701 if (self->ref_reloc_sym.name == NULL)
704 bracket = strchr(self->ref_reloc_sym.name, ']');
708 self->ref_reloc_sym.addr = addr;
710 for (i = 0; i < MAP__NR_TYPES; ++i) {
711 struct kmap *kmap = map__kmap(self->vmlinux_maps[i]);
712 kmap->ref_reloc_sym = &self->ref_reloc_sym;