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94c744b6 ACM |
1 | #include <linux/kernel.h> |
2 | ||
3 | #include <unistd.h> | |
4 | #include <sys/types.h> | |
5 | ||
6 | #include "session.h" | |
a328626b | 7 | #include "sort.h" |
94c744b6 ACM |
8 | #include "util.h" |
9 | ||
10 | static int perf_session__open(struct perf_session *self, bool force) | |
11 | { | |
12 | struct stat input_stat; | |
13 | ||
14 | self->fd = open(self->filename, O_RDONLY); | |
15 | if (self->fd < 0) { | |
16 | pr_err("failed to open file: %s", self->filename); | |
17 | if (!strcmp(self->filename, "perf.data")) | |
18 | pr_err(" (try 'perf record' first)"); | |
19 | pr_err("\n"); | |
20 | return -errno; | |
21 | } | |
22 | ||
23 | if (fstat(self->fd, &input_stat) < 0) | |
24 | goto out_close; | |
25 | ||
26 | if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) { | |
27 | pr_err("file %s not owned by current user or root\n", | |
28 | self->filename); | |
29 | goto out_close; | |
30 | } | |
31 | ||
32 | if (!input_stat.st_size) { | |
33 | pr_info("zero-sized file (%s), nothing to do!\n", | |
34 | self->filename); | |
35 | goto out_close; | |
36 | } | |
37 | ||
38 | if (perf_header__read(&self->header, self->fd) < 0) { | |
39 | pr_err("incompatible file format"); | |
40 | goto out_close; | |
41 | } | |
42 | ||
43 | self->size = input_stat.st_size; | |
44 | return 0; | |
45 | ||
46 | out_close: | |
47 | close(self->fd); | |
48 | self->fd = -1; | |
49 | return -1; | |
50 | } | |
51 | ||
75be6cf4 | 52 | struct perf_session *perf_session__new(const char *filename, int mode, bool force) |
94c744b6 | 53 | { |
b3165f41 | 54 | size_t len = filename ? strlen(filename) + 1 : 0; |
94c744b6 ACM |
55 | struct perf_session *self = zalloc(sizeof(*self) + len); |
56 | ||
57 | if (self == NULL) | |
58 | goto out; | |
59 | ||
60 | if (perf_header__init(&self->header) < 0) | |
4aa65636 | 61 | goto out_free; |
94c744b6 ACM |
62 | |
63 | memcpy(self->filename, filename, len); | |
b3165f41 ACM |
64 | self->threads = RB_ROOT; |
65 | self->last_match = NULL; | |
ec913369 ACM |
66 | self->mmap_window = 32; |
67 | self->cwd = NULL; | |
68 | self->cwdlen = 0; | |
31d337c4 | 69 | self->unknown_events = 0; |
4aa65636 | 70 | map_groups__init(&self->kmaps); |
94c744b6 | 71 | |
75be6cf4 | 72 | if (perf_session__create_kernel_maps(self) < 0) |
4aa65636 ACM |
73 | goto out_delete; |
74 | ||
75 | if (mode == O_RDONLY && perf_session__open(self, force) < 0) | |
76 | goto out_delete; | |
d549c769 ACM |
77 | |
78 | self->sample_type = perf_header__sample_type(&self->header); | |
94c744b6 ACM |
79 | out: |
80 | return self; | |
4aa65636 | 81 | out_free: |
94c744b6 ACM |
82 | free(self); |
83 | return NULL; | |
4aa65636 ACM |
84 | out_delete: |
85 | perf_session__delete(self); | |
86 | return NULL; | |
94c744b6 ACM |
87 | } |
88 | ||
89 | void perf_session__delete(struct perf_session *self) | |
90 | { | |
91 | perf_header__exit(&self->header); | |
92 | close(self->fd); | |
ec913369 | 93 | free(self->cwd); |
94c744b6 ACM |
94 | free(self); |
95 | } | |
a328626b ACM |
96 | |
97 | static bool symbol__match_parent_regex(struct symbol *sym) | |
98 | { | |
99 | if (sym->name && !regexec(&parent_regex, sym->name, 0, NULL, 0)) | |
100 | return 1; | |
101 | ||
102 | return 0; | |
103 | } | |
104 | ||
105 | struct symbol **perf_session__resolve_callchain(struct perf_session *self, | |
106 | struct thread *thread, | |
107 | struct ip_callchain *chain, | |
108 | struct symbol **parent) | |
109 | { | |
110 | u8 cpumode = PERF_RECORD_MISC_USER; | |
111 | struct symbol **syms = NULL; | |
112 | unsigned int i; | |
113 | ||
d599db3f | 114 | if (symbol_conf.use_callchain) { |
a328626b ACM |
115 | syms = calloc(chain->nr, sizeof(*syms)); |
116 | if (!syms) { | |
117 | fprintf(stderr, "Can't allocate memory for symbols\n"); | |
118 | exit(-1); | |
119 | } | |
120 | } | |
121 | ||
122 | for (i = 0; i < chain->nr; i++) { | |
123 | u64 ip = chain->ips[i]; | |
124 | struct addr_location al; | |
125 | ||
126 | if (ip >= PERF_CONTEXT_MAX) { | |
127 | switch (ip) { | |
128 | case PERF_CONTEXT_HV: | |
129 | cpumode = PERF_RECORD_MISC_HYPERVISOR; break; | |
130 | case PERF_CONTEXT_KERNEL: | |
131 | cpumode = PERF_RECORD_MISC_KERNEL; break; | |
132 | case PERF_CONTEXT_USER: | |
133 | cpumode = PERF_RECORD_MISC_USER; break; | |
134 | default: | |
135 | break; | |
136 | } | |
137 | continue; | |
138 | } | |
139 | ||
140 | thread__find_addr_location(thread, self, cpumode, | |
141 | MAP__FUNCTION, ip, &al, NULL); | |
142 | if (al.sym != NULL) { | |
143 | if (sort__has_parent && !*parent && | |
144 | symbol__match_parent_regex(al.sym)) | |
145 | *parent = al.sym; | |
d599db3f | 146 | if (!symbol_conf.use_callchain) |
a328626b ACM |
147 | break; |
148 | syms[i] = al.sym; | |
149 | } | |
150 | } | |
151 | ||
152 | return syms; | |
153 | } | |
06aae590 ACM |
154 | |
155 | static int process_event_stub(event_t *event __used, | |
156 | struct perf_session *session __used) | |
157 | { | |
158 | dump_printf(": unhandled!\n"); | |
159 | return 0; | |
160 | } | |
161 | ||
162 | static void perf_event_ops__fill_defaults(struct perf_event_ops *handler) | |
163 | { | |
164 | if (handler->process_sample_event == NULL) | |
165 | handler->process_sample_event = process_event_stub; | |
166 | if (handler->process_mmap_event == NULL) | |
167 | handler->process_mmap_event = process_event_stub; | |
168 | if (handler->process_comm_event == NULL) | |
169 | handler->process_comm_event = process_event_stub; | |
170 | if (handler->process_fork_event == NULL) | |
171 | handler->process_fork_event = process_event_stub; | |
172 | if (handler->process_exit_event == NULL) | |
173 | handler->process_exit_event = process_event_stub; | |
174 | if (handler->process_lost_event == NULL) | |
175 | handler->process_lost_event = process_event_stub; | |
176 | if (handler->process_read_event == NULL) | |
177 | handler->process_read_event = process_event_stub; | |
178 | if (handler->process_throttle_event == NULL) | |
179 | handler->process_throttle_event = process_event_stub; | |
180 | if (handler->process_unthrottle_event == NULL) | |
181 | handler->process_unthrottle_event = process_event_stub; | |
182 | } | |
183 | ||
184 | static const char *event__name[] = { | |
185 | [0] = "TOTAL", | |
186 | [PERF_RECORD_MMAP] = "MMAP", | |
187 | [PERF_RECORD_LOST] = "LOST", | |
188 | [PERF_RECORD_COMM] = "COMM", | |
189 | [PERF_RECORD_EXIT] = "EXIT", | |
190 | [PERF_RECORD_THROTTLE] = "THROTTLE", | |
191 | [PERF_RECORD_UNTHROTTLE] = "UNTHROTTLE", | |
192 | [PERF_RECORD_FORK] = "FORK", | |
193 | [PERF_RECORD_READ] = "READ", | |
194 | [PERF_RECORD_SAMPLE] = "SAMPLE", | |
195 | }; | |
196 | ||
197 | unsigned long event__total[PERF_RECORD_MAX]; | |
198 | ||
199 | void event__print_totals(void) | |
200 | { | |
201 | int i; | |
202 | for (i = 0; i < PERF_RECORD_MAX; ++i) | |
203 | pr_info("%10s events: %10ld\n", | |
204 | event__name[i], event__total[i]); | |
205 | } | |
206 | ||
207 | static int perf_session__process_event(struct perf_session *self, | |
208 | event_t *event, | |
209 | struct perf_event_ops *ops, | |
210 | unsigned long offset, unsigned long head) | |
211 | { | |
212 | trace_event(event); | |
213 | ||
214 | if (event->header.type < PERF_RECORD_MAX) { | |
215 | dump_printf("%p [%p]: PERF_RECORD_%s", | |
216 | (void *)(offset + head), | |
217 | (void *)(long)(event->header.size), | |
218 | event__name[event->header.type]); | |
219 | ++event__total[0]; | |
220 | ++event__total[event->header.type]; | |
221 | } | |
222 | ||
223 | switch (event->header.type) { | |
224 | case PERF_RECORD_SAMPLE: | |
225 | return ops->process_sample_event(event, self); | |
226 | case PERF_RECORD_MMAP: | |
227 | return ops->process_mmap_event(event, self); | |
228 | case PERF_RECORD_COMM: | |
229 | return ops->process_comm_event(event, self); | |
230 | case PERF_RECORD_FORK: | |
231 | return ops->process_fork_event(event, self); | |
232 | case PERF_RECORD_EXIT: | |
233 | return ops->process_exit_event(event, self); | |
234 | case PERF_RECORD_LOST: | |
235 | return ops->process_lost_event(event, self); | |
236 | case PERF_RECORD_READ: | |
237 | return ops->process_read_event(event, self); | |
238 | case PERF_RECORD_THROTTLE: | |
239 | return ops->process_throttle_event(event, self); | |
240 | case PERF_RECORD_UNTHROTTLE: | |
241 | return ops->process_unthrottle_event(event, self); | |
242 | default: | |
31d337c4 | 243 | self->unknown_events++; |
06aae590 ACM |
244 | return -1; |
245 | } | |
246 | } | |
247 | ||
248 | int perf_header__read_build_ids(int input, u64 offset, u64 size) | |
249 | { | |
250 | struct build_id_event bev; | |
251 | char filename[PATH_MAX]; | |
252 | u64 limit = offset + size; | |
253 | int err = -1; | |
254 | ||
255 | while (offset < limit) { | |
256 | struct dso *dso; | |
257 | ssize_t len; | |
258 | ||
259 | if (read(input, &bev, sizeof(bev)) != sizeof(bev)) | |
260 | goto out; | |
261 | ||
262 | len = bev.header.size - sizeof(bev); | |
263 | if (read(input, filename, len) != len) | |
264 | goto out; | |
265 | ||
266 | dso = dsos__findnew(filename); | |
267 | if (dso != NULL) | |
268 | dso__set_build_id(dso, &bev.build_id); | |
269 | ||
270 | offset += bev.header.size; | |
271 | } | |
272 | err = 0; | |
273 | out: | |
274 | return err; | |
275 | } | |
276 | ||
277 | static struct thread *perf_session__register_idle_thread(struct perf_session *self) | |
278 | { | |
279 | struct thread *thread = perf_session__findnew(self, 0); | |
280 | ||
281 | if (thread == NULL || thread__set_comm(thread, "swapper")) { | |
282 | pr_err("problem inserting idle task.\n"); | |
283 | thread = NULL; | |
284 | } | |
285 | ||
286 | return thread; | |
287 | } | |
288 | ||
289 | int perf_session__process_events(struct perf_session *self, | |
290 | struct perf_event_ops *ops) | |
291 | { | |
292 | int err; | |
293 | unsigned long head, shift; | |
294 | unsigned long offset = 0; | |
295 | size_t page_size; | |
296 | event_t *event; | |
297 | uint32_t size; | |
298 | char *buf; | |
299 | ||
300 | if (perf_session__register_idle_thread(self) == NULL) | |
301 | return -ENOMEM; | |
302 | ||
303 | perf_event_ops__fill_defaults(ops); | |
304 | ||
305 | page_size = getpagesize(); | |
306 | ||
307 | head = self->header.data_offset; | |
06aae590 | 308 | |
f7d87444 | 309 | if (!symbol_conf.full_paths) { |
06aae590 ACM |
310 | char bf[PATH_MAX]; |
311 | ||
312 | if (getcwd(bf, sizeof(bf)) == NULL) { | |
313 | err = -errno; | |
314 | out_getcwd_err: | |
315 | pr_err("failed to get the current directory\n"); | |
316 | goto out_err; | |
317 | } | |
318 | self->cwd = strdup(bf); | |
319 | if (self->cwd == NULL) { | |
320 | err = -ENOMEM; | |
321 | goto out_getcwd_err; | |
322 | } | |
323 | self->cwdlen = strlen(self->cwd); | |
324 | } | |
325 | ||
326 | shift = page_size * (head / page_size); | |
327 | offset += shift; | |
328 | head -= shift; | |
329 | ||
330 | remap: | |
331 | buf = mmap(NULL, page_size * self->mmap_window, PROT_READ, | |
332 | MAP_SHARED, self->fd, offset); | |
333 | if (buf == MAP_FAILED) { | |
334 | pr_err("failed to mmap file\n"); | |
335 | err = -errno; | |
336 | goto out_err; | |
337 | } | |
338 | ||
339 | more: | |
340 | event = (event_t *)(buf + head); | |
341 | ||
342 | size = event->header.size; | |
343 | if (size == 0) | |
344 | size = 8; | |
345 | ||
346 | if (head + event->header.size >= page_size * self->mmap_window) { | |
347 | int munmap_ret; | |
348 | ||
349 | shift = page_size * (head / page_size); | |
350 | ||
351 | munmap_ret = munmap(buf, page_size * self->mmap_window); | |
352 | assert(munmap_ret == 0); | |
353 | ||
354 | offset += shift; | |
355 | head -= shift; | |
356 | goto remap; | |
357 | } | |
358 | ||
359 | size = event->header.size; | |
360 | ||
361 | dump_printf("\n%p [%p]: event: %d\n", | |
362 | (void *)(offset + head), | |
363 | (void *)(long)event->header.size, | |
364 | event->header.type); | |
365 | ||
366 | if (size == 0 || | |
367 | perf_session__process_event(self, event, ops, offset, head) < 0) { | |
368 | dump_printf("%p [%p]: skipping unknown header type: %d\n", | |
369 | (void *)(offset + head), | |
370 | (void *)(long)(event->header.size), | |
371 | event->header.type); | |
372 | /* | |
373 | * assume we lost track of the stream, check alignment, and | |
374 | * increment a single u64 in the hope to catch on again 'soon'. | |
375 | */ | |
376 | if (unlikely(head & 7)) | |
377 | head &= ~7ULL; | |
378 | ||
379 | size = 8; | |
380 | } | |
381 | ||
382 | head += size; | |
383 | ||
384 | if (offset + head >= self->header.data_offset + self->header.data_size) | |
385 | goto done; | |
386 | ||
387 | if (offset + head < self->size) | |
388 | goto more; | |
389 | done: | |
390 | err = 0; | |
391 | out_err: | |
392 | return err; | |
393 | } | |
27295592 | 394 | |
d549c769 | 395 | bool perf_session__has_traces(struct perf_session *self, const char *msg) |
27295592 ACM |
396 | { |
397 | if (!(self->sample_type & PERF_SAMPLE_RAW)) { | |
d549c769 ACM |
398 | pr_err("No trace sample to read. Did you call 'perf %s'?\n", msg); |
399 | return false; | |
27295592 ACM |
400 | } |
401 | ||
d549c769 | 402 | return true; |
27295592 | 403 | } |