1
2#include "../perf.h"
3#include <errno.h>
4#include <stdlib.h>
5#include <stdio.h>
6#include <string.h>
7#include <linux/kernel.h>
8#include <linux/zalloc.h>
9#include "session.h"
10#include "thread.h"
11#include "thread-stack.h"
12#include "debug.h"
13#include "namespaces.h"
14#include "comm.h"
15#include "map.h"
16#include "symbol.h"
17#include "unwind.h"
18#include "callchain.h"
19
20#include <api/fs/fs.h>
21
22int thread__init_map_groups(struct thread *thread, struct machine *machine)
23{
24 pid_t pid = thread->pid_;
25
26 if (pid == thread->tid || pid == -1) {
27 thread->mg = map_groups__new(machine);
28 } else {
29 struct thread *leader = __machine__findnew_thread(machine, pid, pid);
30 if (leader) {
31 thread->mg = map_groups__get(leader->mg);
32 thread__put(leader);
33 }
34 }
35
36 return thread->mg ? 0 : -1;
37}
38
39struct thread *thread__new(pid_t pid, pid_t tid)
40{
41 char *comm_str;
42 struct comm *comm;
43 struct thread *thread = zalloc(sizeof(*thread));
44
45 if (thread != NULL) {
46 thread->pid_ = pid;
47 thread->tid = tid;
48 thread->ppid = -1;
49 thread->cpu = -1;
50 INIT_LIST_HEAD(&thread->namespaces_list);
51 INIT_LIST_HEAD(&thread->comm_list);
52 init_rwsem(&thread->namespaces_lock);
53 init_rwsem(&thread->comm_lock);
54
55 comm_str = malloc(32);
56 if (!comm_str)
57 goto err_thread;
58
59 snprintf(comm_str, 32, ":%d", tid);
60 comm = comm__new(comm_str, 0, false);
61 free(comm_str);
62 if (!comm)
63 goto err_thread;
64
65 list_add(&comm->list, &thread->comm_list);
66 refcount_set(&thread->refcnt, 1);
67 RB_CLEAR_NODE(&thread->rb_node);
68
69 thread->nsinfo = nsinfo__new(pid);
70 srccode_state_init(&thread->srccode_state);
71 }
72
73 return thread;
74
75err_thread:
76 free(thread);
77 return NULL;
78}
79
80void thread__delete(struct thread *thread)
81{
82 struct namespaces *namespaces, *tmp_namespaces;
83 struct comm *comm, *tmp_comm;
84
85 BUG_ON(!RB_EMPTY_NODE(&thread->rb_node));
86
87 thread_stack__free(thread);
88
89 if (thread->mg) {
90 map_groups__put(thread->mg);
91 thread->mg = NULL;
92 }
93 down_write(&thread->namespaces_lock);
94 list_for_each_entry_safe(namespaces, tmp_namespaces,
95 &thread->namespaces_list, list) {
96 list_del_init(&namespaces->list);
97 namespaces__free(namespaces);
98 }
99 up_write(&thread->namespaces_lock);
100
101 down_write(&thread->comm_lock);
102 list_for_each_entry_safe(comm, tmp_comm, &thread->comm_list, list) {
103 list_del_init(&comm->list);
104 comm__free(comm);
105 }
106 up_write(&thread->comm_lock);
107
108 unwind__finish_access(thread);
109 nsinfo__zput(thread->nsinfo);
110 srccode_state_free(&thread->srccode_state);
111
112 exit_rwsem(&thread->namespaces_lock);
113 exit_rwsem(&thread->comm_lock);
114 free(thread);
115}
116
117struct thread *thread__get(struct thread *thread)
118{
119 if (thread)
120 refcount_inc(&thread->refcnt);
121 return thread;
122}
123
124void thread__put(struct thread *thread)
125{
126 if (thread && refcount_dec_and_test(&thread->refcnt)) {
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147 if (!list_empty(&thread->node))
148 list_del_init(&thread->node);
149 thread__delete(thread);
150 }
151}
152
153static struct namespaces *__thread__namespaces(const struct thread *thread)
154{
155 if (list_empty(&thread->namespaces_list))
156 return NULL;
157
158 return list_first_entry(&thread->namespaces_list, struct namespaces, list);
159}
160
161struct namespaces *thread__namespaces(struct thread *thread)
162{
163 struct namespaces *ns;
164
165 down_read(&thread->namespaces_lock);
166 ns = __thread__namespaces(thread);
167 up_read(&thread->namespaces_lock);
168
169 return ns;
170}
171
172static int __thread__set_namespaces(struct thread *thread, u64 timestamp,
173 struct namespaces_event *event)
174{
175 struct namespaces *new, *curr = __thread__namespaces(thread);
176
177 new = namespaces__new(event);
178 if (!new)
179 return -ENOMEM;
180
181 list_add(&new->list, &thread->namespaces_list);
182
183 if (timestamp && curr) {
184
185
186
187
188
189 curr = list_next_entry(new, list);
190 curr->end_time = timestamp;
191 }
192
193 return 0;
194}
195
196int thread__set_namespaces(struct thread *thread, u64 timestamp,
197 struct namespaces_event *event)
198{
199 int ret;
200
201 down_write(&thread->namespaces_lock);
202 ret = __thread__set_namespaces(thread, timestamp, event);
203 up_write(&thread->namespaces_lock);
204 return ret;
205}
206
207struct comm *thread__comm(const struct thread *thread)
208{
209 if (list_empty(&thread->comm_list))
210 return NULL;
211
212 return list_first_entry(&thread->comm_list, struct comm, list);
213}
214
215struct comm *thread__exec_comm(const struct thread *thread)
216{
217 struct comm *comm, *last = NULL, *second_last = NULL;
218
219 list_for_each_entry(comm, &thread->comm_list, list) {
220 if (comm->exec)
221 return comm;
222 second_last = last;
223 last = comm;
224 }
225
226
227
228
229
230
231
232 if (second_last && !last->start && thread->pid_ == thread->tid)
233 return second_last;
234
235 return last;
236}
237
238static int ____thread__set_comm(struct thread *thread, const char *str,
239 u64 timestamp, bool exec)
240{
241 struct comm *new, *curr = thread__comm(thread);
242
243
244 if (!thread->comm_set) {
245 int err = comm__override(curr, str, timestamp, exec);
246 if (err)
247 return err;
248 } else {
249 new = comm__new(str, timestamp, exec);
250 if (!new)
251 return -ENOMEM;
252 list_add(&new->list, &thread->comm_list);
253
254 if (exec)
255 unwind__flush_access(thread);
256 }
257
258 thread->comm_set = true;
259
260 return 0;
261}
262
263int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
264 bool exec)
265{
266 int ret;
267
268 down_write(&thread->comm_lock);
269 ret = ____thread__set_comm(thread, str, timestamp, exec);
270 up_write(&thread->comm_lock);
271 return ret;
272}
273
274int thread__set_comm_from_proc(struct thread *thread)
275{
276 char path[64];
277 char *comm = NULL;
278 size_t sz;
279 int err = -1;
280
281 if (!(snprintf(path, sizeof(path), "%d/task/%d/comm",
282 thread->pid_, thread->tid) >= (int)sizeof(path)) &&
283 procfs__read_str(path, &comm, &sz) == 0) {
284 comm[sz - 1] = '\0';
285 err = thread__set_comm(thread, comm, 0);
286 }
287
288 return err;
289}
290
291static const char *__thread__comm_str(const struct thread *thread)
292{
293 const struct comm *comm = thread__comm(thread);
294
295 if (!comm)
296 return NULL;
297
298 return comm__str(comm);
299}
300
301const char *thread__comm_str(struct thread *thread)
302{
303 const char *str;
304
305 down_read(&thread->comm_lock);
306 str = __thread__comm_str(thread);
307 up_read(&thread->comm_lock);
308
309 return str;
310}
311
312
313int thread__comm_len(struct thread *thread)
314{
315 if (!thread->comm_len) {
316 const char *comm = thread__comm_str(thread);
317 if (!comm)
318 return 0;
319 thread->comm_len = strlen(comm);
320 }
321
322 return thread->comm_len;
323}
324
325size_t thread__fprintf(struct thread *thread, FILE *fp)
326{
327 return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
328 map_groups__fprintf(thread->mg, fp);
329}
330
331int thread__insert_map(struct thread *thread, struct map *map)
332{
333 int ret;
334
335 ret = unwind__prepare_access(thread, map, NULL);
336 if (ret)
337 return ret;
338
339 map_groups__fixup_overlappings(thread->mg, map, stderr);
340 map_groups__insert(thread->mg, map);
341
342 return 0;
343}
344
345static int __thread__prepare_access(struct thread *thread)
346{
347 bool initialized = false;
348 int err = 0;
349 struct maps *maps = &thread->mg->maps;
350 struct map *map;
351
352 down_read(&maps->lock);
353
354 for (map = maps__first(maps); map; map = map__next(map)) {
355 err = unwind__prepare_access(thread, map, &initialized);
356 if (err || initialized)
357 break;
358 }
359
360 up_read(&maps->lock);
361
362 return err;
363}
364
365static int thread__prepare_access(struct thread *thread)
366{
367 int err = 0;
368
369 if (dwarf_callchain_users)
370 err = __thread__prepare_access(thread);
371
372 return err;
373}
374
375static int thread__clone_map_groups(struct thread *thread,
376 struct thread *parent,
377 bool do_maps_clone)
378{
379
380 if (thread->pid_ == parent->pid_)
381 return thread__prepare_access(thread);
382
383 if (thread->mg == parent->mg) {
384 pr_debug("broken map groups on thread %d/%d parent %d/%d\n",
385 thread->pid_, thread->tid, parent->pid_, parent->tid);
386 return 0;
387 }
388
389 return do_maps_clone ? map_groups__clone(thread, parent->mg) : 0;
390}
391
392int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp, bool do_maps_clone)
393{
394 if (parent->comm_set) {
395 const char *comm = thread__comm_str(parent);
396 int err;
397 if (!comm)
398 return -ENOMEM;
399 err = thread__set_comm(thread, comm, timestamp);
400 if (err)
401 return err;
402 }
403
404 thread->ppid = parent->tid;
405 return thread__clone_map_groups(thread, parent, do_maps_clone);
406}
407
408void thread__find_cpumode_addr_location(struct thread *thread, u64 addr,
409 struct addr_location *al)
410{
411 size_t i;
412 const u8 cpumodes[] = {
413 PERF_RECORD_MISC_USER,
414 PERF_RECORD_MISC_KERNEL,
415 PERF_RECORD_MISC_GUEST_USER,
416 PERF_RECORD_MISC_GUEST_KERNEL
417 };
418
419 for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
420 thread__find_symbol(thread, cpumodes[i], addr, al);
421 if (al->map)
422 break;
423 }
424}
425
426struct thread *thread__main_thread(struct machine *machine, struct thread *thread)
427{
428 if (thread->pid_ == thread->tid)
429 return thread__get(thread);
430
431 if (thread->pid_ == -1)
432 return NULL;
433
434 return machine__find_thread(machine, thread->pid_, thread->pid_);
435}
436
437int thread__memcpy(struct thread *thread, struct machine *machine,
438 void *buf, u64 ip, int len, bool *is64bit)
439{
440 u8 cpumode = PERF_RECORD_MISC_USER;
441 struct addr_location al;
442 long offset;
443
444 if (machine__kernel_ip(machine, ip))
445 cpumode = PERF_RECORD_MISC_KERNEL;
446
447 if (!thread__find_map(thread, cpumode, ip, &al) || !al.map->dso ||
448 al.map->dso->data.status == DSO_DATA_STATUS_ERROR ||
449 map__load(al.map) < 0)
450 return -1;
451
452 offset = al.map->map_ip(al.map, ip);
453 if (is64bit)
454 *is64bit = al.map->dso->is_64_bit;
455
456 return dso__data_read_offset(al.map->dso, machine, offset, buf, len);
457}
458