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 self->fd = open(self->filename, O_RDONLY);
19 pr_err("failed to open file: %s", self->filename);
20 if (!strcmp(self->filename, "perf.data"))
21 pr_err(" (try 'perf record' first)");
26 if (fstat(self->fd, &input_stat) < 0)
29 if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) {
30 pr_err("file %s not owned by current user or root\n",
35 if (!input_stat.st_size) {
36 pr_info("zero-sized file (%s), nothing to do!\n",
41 if (perf_header__read(&self->header, self->fd) < 0) {
42 pr_err("incompatible file format");
46 self->size = input_stat.st_size;
55 static inline int perf_session__create_kernel_maps(struct perf_session *self)
57 return map_groups__create_kernel_maps(&self->kmaps, self->vmlinux_maps);
60 struct perf_session *perf_session__new(const char *filename, int mode, bool force)
62 size_t len = filename ? strlen(filename) + 1 : 0;
63 struct perf_session *self = zalloc(sizeof(*self) + len);
68 if (perf_header__init(&self->header) < 0)
71 memcpy(self->filename, filename, len);
72 self->threads = RB_ROOT;
73 self->stats_by_id = RB_ROOT;
74 self->last_match = NULL;
75 self->mmap_window = 32;
78 self->unknown_events = 0;
79 map_groups__init(&self->kmaps);
81 if (mode == O_RDONLY) {
82 if (perf_session__open(self, force) < 0)
84 } else if (mode == O_WRONLY) {
86 * In O_RDONLY mode this will be performed when reading the
87 * kernel MMAP event, in event__process_mmap().
89 if (perf_session__create_kernel_maps(self) < 0)
93 self->sample_type = perf_header__sample_type(&self->header);
100 perf_session__delete(self);
104 void perf_session__delete(struct perf_session *self)
106 perf_header__exit(&self->header);
112 static bool symbol__match_parent_regex(struct symbol *sym)
114 if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0))
120 struct symbol **perf_session__resolve_callchain(struct perf_session *self,
121 struct thread *thread,
122 struct ip_callchain *chain,
123 struct symbol **parent)
125 u8 cpumode = PERF_RECORD_MISC_USER;
126 struct symbol **syms = NULL;
129 if (symbol_conf.use_callchain) {
130 syms = calloc(chain->nr, sizeof(*syms));
132 fprintf(stderr, "Can't allocate memory for symbols\n");
137 for (i = 0; i < chain->nr; i++) {
138 u64 ip = chain->ips[i];
139 struct addr_location al;
141 if (ip >= PERF_CONTEXT_MAX) {
143 case PERF_CONTEXT_HV:
144 cpumode = PERF_RECORD_MISC_HYPERVISOR; break;
145 case PERF_CONTEXT_KERNEL:
146 cpumode = PERF_RECORD_MISC_KERNEL; break;
147 case PERF_CONTEXT_USER:
148 cpumode = PERF_RECORD_MISC_USER; break;
155 thread__find_addr_location(thread, self, cpumode,
156 MAP__FUNCTION, ip, &al, NULL);
157 if (al.sym != NULL) {
158 if (sort__has_parent && !*parent &&
159 symbol__match_parent_regex(al.sym))
161 if (!symbol_conf.use_callchain)
170 static int process_event_stub(event_t *event __used,
171 struct perf_session *session __used)
173 dump_printf(": unhandled!\n");
177 static void perf_event_ops__fill_defaults(struct perf_event_ops *handler)
179 if (handler->sample == NULL)
180 handler->sample = process_event_stub;
181 if (handler->mmap == NULL)
182 handler->mmap = process_event_stub;
183 if (handler->comm == NULL)
184 handler->comm = process_event_stub;
185 if (handler->fork == NULL)
186 handler->fork = process_event_stub;
187 if (handler->exit == NULL)
188 handler->exit = process_event_stub;
189 if (handler->lost == NULL)
190 handler->lost = process_event_stub;
191 if (handler->read == NULL)
192 handler->read = process_event_stub;
193 if (handler->throttle == NULL)
194 handler->throttle = process_event_stub;
195 if (handler->unthrottle == NULL)
196 handler->unthrottle = process_event_stub;
199 static const char *event__name[] = {
201 [PERF_RECORD_MMAP] = "MMAP",
202 [PERF_RECORD_LOST] = "LOST",
203 [PERF_RECORD_COMM] = "COMM",
204 [PERF_RECORD_EXIT] = "EXIT",
205 [PERF_RECORD_THROTTLE] = "THROTTLE",
206 [PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE",
207 [PERF_RECORD_FORK] = "FORK",
208 [PERF_RECORD_READ] = "READ",
209 [PERF_RECORD_SAMPLE] = "SAMPLE",
212 unsigned long event__total[PERF_RECORD_MAX];
214 void event__print_totals(void)
217 for (i = 0; i < PERF_RECORD_MAX; ++i)
218 pr_info("%10s events: %10ld\n",
219 event__name[i], event__total[i]);
222 void mem_bswap_64(void *src, int byte_size)
226 while (byte_size > 0) {
228 byte_size -= sizeof(u64);
233 static void event__all64_swap(event_t *self)
235 struct perf_event_header *hdr = &self->header;
236 mem_bswap_64(hdr + 1, self->header.size - sizeof(*hdr));
239 static void event__comm_swap(event_t *self)
241 self->comm.pid = bswap_32(self->comm.pid);
242 self->comm.tid = bswap_32(self->comm.tid);
245 static void event__mmap_swap(event_t *self)
247 self->mmap.pid = bswap_32(self->mmap.pid);
248 self->mmap.tid = bswap_32(self->mmap.tid);
249 self->mmap.start = bswap_64(self->mmap.start);
250 self->mmap.len = bswap_64(self->mmap.len);
251 self->mmap.pgoff = bswap_64(self->mmap.pgoff);
254 static void event__task_swap(event_t *self)
256 self->fork.pid = bswap_32(self->fork.pid);
257 self->fork.tid = bswap_32(self->fork.tid);
258 self->fork.ppid = bswap_32(self->fork.ppid);
259 self->fork.ptid = bswap_32(self->fork.ptid);
260 self->fork.time = bswap_64(self->fork.time);
263 static void event__read_swap(event_t *self)
265 self->read.pid = bswap_32(self->read.pid);
266 self->read.tid = bswap_32(self->read.tid);
267 self->read.value = bswap_64(self->read.value);
268 self->read.time_enabled = bswap_64(self->read.time_enabled);
269 self->read.time_running = bswap_64(self->read.time_running);
270 self->read.id = bswap_64(self->read.id);
273 typedef void (*event__swap_op)(event_t *self);
275 static event__swap_op event__swap_ops[] = {
276 [PERF_RECORD_MMAP] = event__mmap_swap,
277 [PERF_RECORD_COMM] = event__comm_swap,
278 [PERF_RECORD_FORK] = event__task_swap,
279 [PERF_RECORD_EXIT] = event__task_swap,
280 [PERF_RECORD_LOST] = event__all64_swap,
281 [PERF_RECORD_READ] = event__read_swap,
282 [PERF_RECORD_SAMPLE] = event__all64_swap,
283 [PERF_RECORD_MAX] = NULL,
286 static int perf_session__process_event(struct perf_session *self,
288 struct perf_event_ops *ops,
289 u64 offset, u64 head)
293 if (event->header.type < PERF_RECORD_MAX) {
294 dump_printf("%#Lx [%#x]: PERF_RECORD_%s",
295 offset + head, event->header.size,
296 event__name[event->header.type]);
298 ++event__total[event->header.type];
301 if (self->header.needs_swap && event__swap_ops[event->header.type])
302 event__swap_ops[event->header.type](event);
304 switch (event->header.type) {
305 case PERF_RECORD_SAMPLE:
306 return ops->sample(event, self);
307 case PERF_RECORD_MMAP:
308 return ops->mmap(event, self);
309 case PERF_RECORD_COMM:
310 return ops->comm(event, self);
311 case PERF_RECORD_FORK:
312 return ops->fork(event, self);
313 case PERF_RECORD_EXIT:
314 return ops->exit(event, self);
315 case PERF_RECORD_LOST:
316 return ops->lost(event, self);
317 case PERF_RECORD_READ:
318 return ops->read(event, self);
319 case PERF_RECORD_THROTTLE:
320 return ops->throttle(event, self);
321 case PERF_RECORD_UNTHROTTLE:
322 return ops->unthrottle(event, self);
324 self->unknown_events++;
329 void perf_event_header__bswap(struct perf_event_header *self)
331 self->type = bswap_32(self->type);
332 self->misc = bswap_16(self->misc);
333 self->size = bswap_16(self->size);
336 int perf_header__read_build_ids(struct perf_header *self,
337 int input, u64 offset, u64 size)
339 struct build_id_event bev;
340 char filename[PATH_MAX];
341 u64 limit = offset + size;
344 while (offset < limit) {
347 struct list_head *head = &dsos__user;
349 if (read(input, &bev, sizeof(bev)) != sizeof(bev))
352 if (self->needs_swap)
353 perf_event_header__bswap(&bev.header);
355 len = bev.header.size - sizeof(bev);
356 if (read(input, filename, len) != len)
359 if (bev.header.misc & PERF_RECORD_MISC_KERNEL)
360 head = &dsos__kernel;
362 dso = __dsos__findnew(head, filename);
364 dso__set_build_id(dso, &bev.build_id);
365 if (head == &dsos__kernel && filename[0] == '[')
369 offset += bev.header.size;
376 static struct thread *perf_session__register_idle_thread(struct perf_session *self)
378 struct thread *thread = perf_session__findnew(self, 0);
380 if (thread == NULL || thread__set_comm(thread, "swapper")) {
381 pr_err("problem inserting idle task.\n");
388 int __perf_session__process_events(struct perf_session *self,
389 u64 data_offset, u64 data_size,
390 u64 file_size, struct perf_event_ops *ops)
392 int err, mmap_prot, mmap_flags;
400 perf_event_ops__fill_defaults(ops);
402 page_size = sysconf(_SC_PAGESIZE);
405 shift = page_size * (head / page_size);
409 mmap_prot = PROT_READ;
410 mmap_flags = MAP_SHARED;
412 if (self->header.needs_swap) {
413 mmap_prot |= PROT_WRITE;
414 mmap_flags = MAP_PRIVATE;
417 buf = mmap(NULL, page_size * self->mmap_window, mmap_prot,
418 mmap_flags, self->fd, offset);
419 if (buf == MAP_FAILED) {
420 pr_err("failed to mmap file\n");
426 event = (event_t *)(buf + head);
428 if (self->header.needs_swap)
429 perf_event_header__bswap(&event->header);
430 size = event->header.size;
434 if (head + event->header.size >= page_size * self->mmap_window) {
437 shift = page_size * (head / page_size);
439 munmap_ret = munmap(buf, page_size * self->mmap_window);
440 assert(munmap_ret == 0);
447 size = event->header.size;
449 dump_printf("\n%#Lx [%#x]: event: %d\n",
450 offset + head, event->header.size, event->header.type);
453 perf_session__process_event(self, event, ops, offset, head) < 0) {
454 dump_printf("%#Lx [%#x]: skipping unknown header type: %d\n",
455 offset + head, event->header.size,
458 * assume we lost track of the stream, check alignment, and
459 * increment a single u64 in the hope to catch on again 'soon'.
461 if (unlikely(head & 7))
469 if (offset + head >= data_offset + data_size)
472 if (offset + head < file_size)
480 int perf_session__process_events(struct perf_session *self,
481 struct perf_event_ops *ops)
485 if (perf_session__register_idle_thread(self) == NULL)
488 if (!symbol_conf.full_paths) {
491 if (getcwd(bf, sizeof(bf)) == NULL) {
494 pr_err("failed to get the current directory\n");
497 self->cwd = strdup(bf);
498 if (self->cwd == NULL) {
502 self->cwdlen = strlen(self->cwd);
505 err = __perf_session__process_events(self, self->header.data_offset,
506 self->header.data_size,
512 bool perf_session__has_traces(struct perf_session *self, const char *msg)
514 if (!(self->sample_type & PERF_SAMPLE_RAW)) {
515 pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg);
522 int perf_session__set_kallsyms_ref_reloc_sym(struct perf_session *self,
523 const char *symbol_name,
529 self->ref_reloc_sym.name = strdup(symbol_name);
530 if (self->ref_reloc_sym.name == NULL)
533 bracket = strchr(self->ref_reloc_sym.name, ']');
537 self->ref_reloc_sym.addr = addr;
539 for (i = 0; i < MAP__NR_TYPES; ++i) {
540 struct kmap *kmap = map__kmap(self->vmlinux_maps[i]);
541 kmap->ref_reloc_sym = &self->ref_reloc_sym;
547 static u64 map__reloc_map_ip(struct map *map, u64 ip)
549 return ip + (s64)map->pgoff;
552 static u64 map__reloc_unmap_ip(struct map *map, u64 ip)
554 return ip - (s64)map->pgoff;
557 void map__reloc_vmlinux(struct map *self)
559 struct kmap *kmap = map__kmap(self);
562 if (!kmap->ref_reloc_sym || !kmap->ref_reloc_sym->unrelocated_addr)
565 reloc = (kmap->ref_reloc_sym->unrelocated_addr -
566 kmap->ref_reloc_sym->addr);
571 self->map_ip = map__reloc_map_ip;
572 self->unmap_ip = map__reloc_unmap_ip;