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1// SPDX-License-Identifier: GPL-2.0
2#include <errno.h>
3#include <stdlib.h>
4#include <stdio.h>
5#include <string.h>
6#include <linux/kernel.h>
7#include <linux/zalloc.h>
8#include "dso.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_maps(struct thread *thread, struct machine *machine)
23{
24 pid_t pid = thread__pid(thread);
25
26 if (pid == thread__tid(thread) || pid == -1) {
27 thread__set_maps(thread, maps__new(machine));
28 } else {
29 struct thread *leader = __machine__findnew_thread(machine, pid, pid);
30
31 if (leader) {
32 thread__set_maps(thread, maps__get(thread__maps(leader)));
33 thread__put(leader);
34 }
35 }
36
37 return thread__maps(thread) ? 0 : -1;
38}
39
40struct thread *thread__new(pid_t pid, pid_t tid)
41{
42 char *comm_str;
43 struct comm *comm;
44 RC_STRUCT(thread) *_thread = zalloc(sizeof(*_thread));
45 struct thread *thread;
46
47 if (ADD_RC_CHK(thread, _thread) != NULL) {
48 thread__set_pid(thread, pid);
49 thread__set_tid(thread, tid);
50 thread__set_ppid(thread, -1);
51 thread__set_cpu(thread, -1);
52 thread__set_guest_cpu(thread, -1);
53 thread__set_lbr_stitch_enable(thread, false);
54 INIT_LIST_HEAD(thread__namespaces_list(thread));
55 INIT_LIST_HEAD(thread__comm_list(thread));
56 init_rwsem(thread__namespaces_lock(thread));
57 init_rwsem(thread__comm_lock(thread));
58
59 comm_str = malloc(32);
60 if (!comm_str)
61 goto err_thread;
62
63 snprintf(comm_str, 32, ":%d", tid);
64 comm = comm__new(comm_str, 0, false);
65 free(comm_str);
66 if (!comm)
67 goto err_thread;
68
69 list_add(&comm->list, thread__comm_list(thread));
70 refcount_set(thread__refcnt(thread), 1);
71 /* Thread holds first ref to nsdata. */
72 RC_CHK_ACCESS(thread)->nsinfo = nsinfo__new(pid);
73 srccode_state_init(thread__srccode_state(thread));
74 }
75
76 return thread;
77
78err_thread:
79 free(thread);
80 return NULL;
81}
82
83static void (*thread__priv_destructor)(void *priv);
84
85void thread__set_priv_destructor(void (*destructor)(void *priv))
86{
87 assert(thread__priv_destructor == NULL);
88
89 thread__priv_destructor = destructor;
90}
91
92void thread__delete(struct thread *thread)
93{
94 struct namespaces *namespaces, *tmp_namespaces;
95 struct comm *comm, *tmp_comm;
96
97 thread_stack__free(thread);
98
99 if (thread__maps(thread)) {
100 maps__put(thread__maps(thread));
101 thread__set_maps(thread, NULL);
102 }
103 down_write(thread__namespaces_lock(thread));
104 list_for_each_entry_safe(namespaces, tmp_namespaces,
105 thread__namespaces_list(thread), list) {
106 list_del_init(&namespaces->list);
107 namespaces__free(namespaces);
108 }
109 up_write(thread__namespaces_lock(thread));
110
111 down_write(thread__comm_lock(thread));
112 list_for_each_entry_safe(comm, tmp_comm, thread__comm_list(thread), list) {
113 list_del_init(&comm->list);
114 comm__free(comm);
115 }
116 up_write(thread__comm_lock(thread));
117
118 nsinfo__zput(RC_CHK_ACCESS(thread)->nsinfo);
119 srccode_state_free(thread__srccode_state(thread));
120
121 exit_rwsem(thread__namespaces_lock(thread));
122 exit_rwsem(thread__comm_lock(thread));
123 thread__free_stitch_list(thread);
124
125 if (thread__priv_destructor)
126 thread__priv_destructor(thread__priv(thread));
127
128 RC_CHK_FREE(thread);
129}
130
131struct thread *thread__get(struct thread *thread)
132{
133 struct thread *result;
134
135 if (RC_CHK_GET(result, thread))
136 refcount_inc(thread__refcnt(thread));
137
138 return result;
139}
140
141void thread__put(struct thread *thread)
142{
143 if (thread && refcount_dec_and_test(thread__refcnt(thread)))
144 thread__delete(thread);
145 else
146 RC_CHK_PUT(thread);
147}
148
149static struct namespaces *__thread__namespaces(struct thread *thread)
150{
151 if (list_empty(thread__namespaces_list(thread)))
152 return NULL;
153
154 return list_first_entry(thread__namespaces_list(thread), struct namespaces, list);
155}
156
157struct namespaces *thread__namespaces(struct thread *thread)
158{
159 struct namespaces *ns;
160
161 down_read(thread__namespaces_lock(thread));
162 ns = __thread__namespaces(thread);
163 up_read(thread__namespaces_lock(thread));
164
165 return ns;
166}
167
168static int __thread__set_namespaces(struct thread *thread, u64 timestamp,
169 struct perf_record_namespaces *event)
170{
171 struct namespaces *new, *curr = __thread__namespaces(thread);
172
173 new = namespaces__new(event);
174 if (!new)
175 return -ENOMEM;
176
177 list_add(&new->list, thread__namespaces_list(thread));
178
179 if (timestamp && curr) {
180 /*
181 * setns syscall must have changed few or all the namespaces
182 * of this thread. Update end time for the namespaces
183 * previously used.
184 */
185 curr = list_next_entry(new, list);
186 curr->end_time = timestamp;
187 }
188
189 return 0;
190}
191
192int thread__set_namespaces(struct thread *thread, u64 timestamp,
193 struct perf_record_namespaces *event)
194{
195 int ret;
196
197 down_write(thread__namespaces_lock(thread));
198 ret = __thread__set_namespaces(thread, timestamp, event);
199 up_write(thread__namespaces_lock(thread));
200 return ret;
201}
202
203struct comm *thread__comm(struct thread *thread)
204{
205 if (list_empty(thread__comm_list(thread)))
206 return NULL;
207
208 return list_first_entry(thread__comm_list(thread), struct comm, list);
209}
210
211struct comm *thread__exec_comm(struct thread *thread)
212{
213 struct comm *comm, *last = NULL, *second_last = NULL;
214
215 list_for_each_entry(comm, thread__comm_list(thread), list) {
216 if (comm->exec)
217 return comm;
218 second_last = last;
219 last = comm;
220 }
221
222 /*
223 * 'last' with no start time might be the parent's comm of a synthesized
224 * thread (created by processing a synthesized fork event). For a main
225 * thread, that is very probably wrong. Prefer a later comm to avoid
226 * that case.
227 */
228 if (second_last && !last->start && thread__pid(thread) == thread__tid(thread))
229 return second_last;
230
231 return last;
232}
233
234static int ____thread__set_comm(struct thread *thread, const char *str,
235 u64 timestamp, bool exec)
236{
237 struct comm *new, *curr = thread__comm(thread);
238
239 /* Override the default :tid entry */
240 if (!thread__comm_set(thread)) {
241 int err = comm__override(curr, str, timestamp, exec);
242 if (err)
243 return err;
244 } else {
245 new = comm__new(str, timestamp, exec);
246 if (!new)
247 return -ENOMEM;
248 list_add(&new->list, thread__comm_list(thread));
249
250 if (exec)
251 unwind__flush_access(thread__maps(thread));
252 }
253
254 thread__set_comm_set(thread, true);
255
256 return 0;
257}
258
259int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
260 bool exec)
261{
262 int ret;
263
264 down_write(thread__comm_lock(thread));
265 ret = ____thread__set_comm(thread, str, timestamp, exec);
266 up_write(thread__comm_lock(thread));
267 return ret;
268}
269
270int thread__set_comm_from_proc(struct thread *thread)
271{
272 char path[64];
273 char *comm = NULL;
274 size_t sz;
275 int err = -1;
276
277 if (!(snprintf(path, sizeof(path), "%d/task/%d/comm",
278 thread__pid(thread), thread__tid(thread)) >= (int)sizeof(path)) &&
279 procfs__read_str(path, &comm, &sz) == 0) {
280 comm[sz - 1] = '\0';
281 err = thread__set_comm(thread, comm, 0);
282 }
283
284 return err;
285}
286
287static const char *__thread__comm_str(struct thread *thread)
288{
289 const struct comm *comm = thread__comm(thread);
290
291 if (!comm)
292 return NULL;
293
294 return comm__str(comm);
295}
296
297const char *thread__comm_str(struct thread *thread)
298{
299 const char *str;
300
301 down_read(thread__comm_lock(thread));
302 str = __thread__comm_str(thread);
303 up_read(thread__comm_lock(thread));
304
305 return str;
306}
307
308static int __thread__comm_len(struct thread *thread, const char *comm)
309{
310 if (!comm)
311 return 0;
312 thread__set_comm_len(thread, strlen(comm));
313
314 return thread__var_comm_len(thread);
315}
316
317/* CHECKME: it should probably better return the max comm len from its comm list */
318int thread__comm_len(struct thread *thread)
319{
320 int comm_len = thread__var_comm_len(thread);
321
322 if (!comm_len) {
323 const char *comm;
324
325 down_read(thread__comm_lock(thread));
326 comm = __thread__comm_str(thread);
327 comm_len = __thread__comm_len(thread, comm);
328 up_read(thread__comm_lock(thread));
329 }
330
331 return comm_len;
332}
333
334size_t thread__fprintf(struct thread *thread, FILE *fp)
335{
336 return fprintf(fp, "Thread %d %s\n", thread__tid(thread), thread__comm_str(thread)) +
337 maps__fprintf(thread__maps(thread), fp);
338}
339
340int thread__insert_map(struct thread *thread, struct map *map)
341{
342 int ret;
343
344 ret = unwind__prepare_access(thread__maps(thread), map, NULL);
345 if (ret)
346 return ret;
347
348 return maps__fixup_overlap_and_insert(thread__maps(thread), map);
349}
350
351struct thread__prepare_access_maps_cb_args {
352 int err;
353 struct maps *maps;
354};
355
356static int thread__prepare_access_maps_cb(struct map *map, void *data)
357{
358 bool initialized = false;
359 struct thread__prepare_access_maps_cb_args *args = data;
360
361 args->err = unwind__prepare_access(args->maps, map, &initialized);
362
363 return (args->err || initialized) ? 1 : 0;
364}
365
366static int thread__prepare_access(struct thread *thread)
367{
368 struct thread__prepare_access_maps_cb_args args = {
369 .err = 0,
370 };
371
372 if (dwarf_callchain_users) {
373 args.maps = thread__maps(thread);
374 maps__for_each_map(thread__maps(thread), thread__prepare_access_maps_cb, &args);
375 }
376
377 return args.err;
378}
379
380static int thread__clone_maps(struct thread *thread, struct thread *parent, bool do_maps_clone)
381{
382 /* This is new thread, we share map groups for process. */
383 if (thread__pid(thread) == thread__pid(parent))
384 return thread__prepare_access(thread);
385
386 if (RC_CHK_EQUAL(thread__maps(thread), thread__maps(parent))) {
387 pr_debug("broken map groups on thread %d/%d parent %d/%d\n",
388 thread__pid(thread), thread__tid(thread),
389 thread__pid(parent), thread__tid(parent));
390 return 0;
391 }
392 /* But this one is new process, copy maps. */
393 return do_maps_clone ? maps__copy_from(thread__maps(thread), thread__maps(parent)) : 0;
394}
395
396int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp, bool do_maps_clone)
397{
398 if (thread__comm_set(parent)) {
399 const char *comm = thread__comm_str(parent);
400 int err;
401 if (!comm)
402 return -ENOMEM;
403 err = thread__set_comm(thread, comm, timestamp);
404 if (err)
405 return err;
406 }
407
408 thread__set_ppid(thread, thread__tid(parent));
409 return thread__clone_maps(thread, parent, do_maps_clone);
410}
411
412void thread__find_cpumode_addr_location(struct thread *thread, u64 addr,
413 struct addr_location *al)
414{
415 size_t i;
416 const u8 cpumodes[] = {
417 PERF_RECORD_MISC_USER,
418 PERF_RECORD_MISC_KERNEL,
419 PERF_RECORD_MISC_GUEST_USER,
420 PERF_RECORD_MISC_GUEST_KERNEL
421 };
422
423 for (i = 0; i < ARRAY_SIZE(cpumodes); i++) {
424 thread__find_symbol(thread, cpumodes[i], addr, al);
425 if (al->map)
426 break;
427 }
428}
429
430struct thread *thread__main_thread(struct machine *machine, struct thread *thread)
431{
432 if (thread__pid(thread) == thread__tid(thread))
433 return thread__get(thread);
434
435 if (thread__pid(thread) == -1)
436 return NULL;
437
438 return machine__find_thread(machine, thread__pid(thread), thread__pid(thread));
439}
440
441int thread__memcpy(struct thread *thread, struct machine *machine,
442 void *buf, u64 ip, int len, bool *is64bit)
443{
444 u8 cpumode = PERF_RECORD_MISC_USER;
445 struct addr_location al;
446 struct dso *dso;
447 long offset;
448
449 if (machine__kernel_ip(machine, ip))
450 cpumode = PERF_RECORD_MISC_KERNEL;
451
452 addr_location__init(&al);
453 if (!thread__find_map(thread, cpumode, ip, &al)) {
454 addr_location__exit(&al);
455 return -1;
456 }
457
458 dso = map__dso(al.map);
459
460 if (!dso || dso->data.status == DSO_DATA_STATUS_ERROR || map__load(al.map) < 0) {
461 addr_location__exit(&al);
462 return -1;
463 }
464
465 offset = map__map_ip(al.map, ip);
466 if (is64bit)
467 *is64bit = dso->is_64_bit;
468
469 addr_location__exit(&al);
470
471 return dso__data_read_offset(dso, machine, offset, buf, len);
472}
473
474void thread__free_stitch_list(struct thread *thread)
475{
476 struct lbr_stitch *lbr_stitch = thread__lbr_stitch(thread);
477 struct stitch_list *pos, *tmp;
478
479 if (!lbr_stitch)
480 return;
481
482 list_for_each_entry_safe(pos, tmp, &lbr_stitch->lists, node) {
483 list_del_init(&pos->node);
484 free(pos);
485 }
486
487 list_for_each_entry_safe(pos, tmp, &lbr_stitch->free_lists, node) {
488 list_del_init(&pos->node);
489 free(pos);
490 }
491
492 zfree(&lbr_stitch->prev_lbr_cursor);
493 free(thread__lbr_stitch(thread));
494 thread__set_lbr_stitch(thread, NULL);
495}
1// SPDX-License-Identifier: GPL-2.0
2#include <errno.h>
3#include <stdlib.h>
4#include <stdio.h>
5#include <string.h>
6#include <linux/kernel.h>
7#include <linux/zalloc.h>
8#include "dso.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_maps(struct thread *thread, struct machine *machine)
23{
24 pid_t pid = thread->pid_;
25
26 if (pid == thread->tid || pid == -1) {
27 thread->maps = maps__new(machine);
28 } else {
29 struct thread *leader = __machine__findnew_thread(machine, pid, pid);
30 if (leader) {
31 thread->maps = maps__get(leader->maps);
32 thread__put(leader);
33 }
34 }
35
36 return thread->maps ? 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 thread->guest_cpu = -1;
51 thread->lbr_stitch_enable = false;
52 INIT_LIST_HEAD(&thread->namespaces_list);
53 INIT_LIST_HEAD(&thread->comm_list);
54 init_rwsem(&thread->namespaces_lock);
55 init_rwsem(&thread->comm_lock);
56
57 comm_str = malloc(32);
58 if (!comm_str)
59 goto err_thread;
60
61 snprintf(comm_str, 32, ":%d", tid);
62 comm = comm__new(comm_str, 0, false);
63 free(comm_str);
64 if (!comm)
65 goto err_thread;
66
67 list_add(&comm->list, &thread->comm_list);
68 refcount_set(&thread->refcnt, 1);
69 RB_CLEAR_NODE(&thread->rb_node);
70 /* Thread holds first ref to nsdata. */
71 thread->nsinfo = nsinfo__new(pid);
72 srccode_state_init(&thread->srccode_state);
73 }
74
75 return thread;
76
77err_thread:
78 free(thread);
79 return NULL;
80}
81
82void thread__delete(struct thread *thread)
83{
84 struct namespaces *namespaces, *tmp_namespaces;
85 struct comm *comm, *tmp_comm;
86
87 BUG_ON(!RB_EMPTY_NODE(&thread->rb_node));
88
89 thread_stack__free(thread);
90
91 if (thread->maps) {
92 maps__put(thread->maps);
93 thread->maps = NULL;
94 }
95 down_write(&thread->namespaces_lock);
96 list_for_each_entry_safe(namespaces, tmp_namespaces,
97 &thread->namespaces_list, list) {
98 list_del_init(&namespaces->list);
99 namespaces__free(namespaces);
100 }
101 up_write(&thread->namespaces_lock);
102
103 down_write(&thread->comm_lock);
104 list_for_each_entry_safe(comm, tmp_comm, &thread->comm_list, list) {
105 list_del_init(&comm->list);
106 comm__free(comm);
107 }
108 up_write(&thread->comm_lock);
109
110 nsinfo__zput(thread->nsinfo);
111 srccode_state_free(&thread->srccode_state);
112
113 exit_rwsem(&thread->namespaces_lock);
114 exit_rwsem(&thread->comm_lock);
115 thread__free_stitch_list(thread);
116 free(thread);
117}
118
119struct thread *thread__get(struct thread *thread)
120{
121 if (thread)
122 refcount_inc(&thread->refcnt);
123 return thread;
124}
125
126void thread__put(struct thread *thread)
127{
128 if (thread && refcount_dec_and_test(&thread->refcnt)) {
129 /*
130 * Remove it from the dead threads list, as last reference is
131 * gone, if it is in a dead threads list.
132 *
133 * We may not be there anymore if say, the machine where it was
134 * stored was already deleted, so we already removed it from
135 * the dead threads and some other piece of code still keeps a
136 * reference.
137 *
138 * This is what 'perf sched' does and finally drops it in
139 * perf_sched__lat(), where it calls perf_sched__read_events(),
140 * that processes the events by creating a session and deleting
141 * it, which ends up destroying the list heads for the dead
142 * threads, but before it does that it removes all threads from
143 * it using list_del_init().
144 *
145 * So we need to check here if it is in a dead threads list and
146 * if so, remove it before finally deleting the thread, to avoid
147 * an use after free situation.
148 */
149 if (!list_empty(&thread->node))
150 list_del_init(&thread->node);
151 thread__delete(thread);
152 }
153}
154
155static struct namespaces *__thread__namespaces(const struct thread *thread)
156{
157 if (list_empty(&thread->namespaces_list))
158 return NULL;
159
160 return list_first_entry(&thread->namespaces_list, struct namespaces, list);
161}
162
163struct namespaces *thread__namespaces(struct thread *thread)
164{
165 struct namespaces *ns;
166
167 down_read(&thread->namespaces_lock);
168 ns = __thread__namespaces(thread);
169 up_read(&thread->namespaces_lock);
170
171 return ns;
172}
173
174static int __thread__set_namespaces(struct thread *thread, u64 timestamp,
175 struct perf_record_namespaces *event)
176{
177 struct namespaces *new, *curr = __thread__namespaces(thread);
178
179 new = namespaces__new(event);
180 if (!new)
181 return -ENOMEM;
182
183 list_add(&new->list, &thread->namespaces_list);
184
185 if (timestamp && curr) {
186 /*
187 * setns syscall must have changed few or all the namespaces
188 * of this thread. Update end time for the namespaces
189 * previously used.
190 */
191 curr = list_next_entry(new, list);
192 curr->end_time = timestamp;
193 }
194
195 return 0;
196}
197
198int thread__set_namespaces(struct thread *thread, u64 timestamp,
199 struct perf_record_namespaces *event)
200{
201 int ret;
202
203 down_write(&thread->namespaces_lock);
204 ret = __thread__set_namespaces(thread, timestamp, event);
205 up_write(&thread->namespaces_lock);
206 return ret;
207}
208
209struct comm *thread__comm(const struct thread *thread)
210{
211 if (list_empty(&thread->comm_list))
212 return NULL;
213
214 return list_first_entry(&thread->comm_list, struct comm, list);
215}
216
217struct comm *thread__exec_comm(const struct thread *thread)
218{
219 struct comm *comm, *last = NULL, *second_last = NULL;
220
221 list_for_each_entry(comm, &thread->comm_list, list) {
222 if (comm->exec)
223 return comm;
224 second_last = last;
225 last = comm;
226 }
227
228 /*
229 * 'last' with no start time might be the parent's comm of a synthesized
230 * thread (created by processing a synthesized fork event). For a main
231 * thread, that is very probably wrong. Prefer a later comm to avoid
232 * that case.
233 */
234 if (second_last && !last->start && thread->pid_ == thread->tid)
235 return second_last;
236
237 return last;
238}
239
240static int ____thread__set_comm(struct thread *thread, const char *str,
241 u64 timestamp, bool exec)
242{
243 struct comm *new, *curr = thread__comm(thread);
244
245 /* Override the default :tid entry */
246 if (!thread->comm_set) {
247 int err = comm__override(curr, str, timestamp, exec);
248 if (err)
249 return err;
250 } else {
251 new = comm__new(str, timestamp, exec);
252 if (!new)
253 return -ENOMEM;
254 list_add(&new->list, &thread->comm_list);
255
256 if (exec)
257 unwind__flush_access(thread->maps);
258 }
259
260 thread->comm_set = true;
261
262 return 0;
263}
264
265int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp,
266 bool exec)
267{
268 int ret;
269
270 down_write(&thread->comm_lock);
271 ret = ____thread__set_comm(thread, str, timestamp, exec);
272 up_write(&thread->comm_lock);
273 return ret;
274}
275
276int thread__set_comm_from_proc(struct thread *thread)
277{
278 char path[64];
279 char *comm = NULL;
280 size_t sz;
281 int err = -1;
282
283 if (!(snprintf(path, sizeof(path), "%d/task/%d/comm",
284 thread->pid_, thread->tid) >= (int)sizeof(path)) &&
285 procfs__read_str(path, &comm, &sz) == 0) {
286 comm[sz - 1] = '\0';
287 err = thread__set_comm(thread, comm, 0);
288 }
289
290 return err;
291}
292
293static const char *__thread__comm_str(const struct thread *thread)
294{
295 const struct comm *comm = thread__comm(thread);
296
297 if (!comm)
298 return NULL;
299
300 return comm__str(comm);
301}
302
303const char *thread__comm_str(struct thread *thread)
304{
305 const char *str;
306
307 down_read(&thread->comm_lock);
308 str = __thread__comm_str(thread);
309 up_read(&thread->comm_lock);
310
311 return str;
312}
313
314/* CHECKME: it should probably better return the max comm len from its comm list */
315int thread__comm_len(struct thread *thread)
316{
317 if (!thread->comm_len) {
318 const char *comm = thread__comm_str(thread);
319 if (!comm)
320 return 0;
321 thread->comm_len = strlen(comm);
322 }
323
324 return thread->comm_len;
325}
326
327size_t thread__fprintf(struct thread *thread, FILE *fp)
328{
329 return fprintf(fp, "Thread %d %s\n", thread->tid, thread__comm_str(thread)) +
330 maps__fprintf(thread->maps, fp);
331}
332
333int thread__insert_map(struct thread *thread, struct map *map)
334{
335 int ret;
336
337 ret = unwind__prepare_access(thread->maps, map, NULL);
338 if (ret)
339 return ret;
340
341 maps__fixup_overlappings(thread->maps, map, stderr);
342 maps__insert(thread->maps, map);
343
344 return 0;
345}
346
347static int __thread__prepare_access(struct thread *thread)
348{
349 bool initialized = false;
350 int err = 0;
351 struct maps *maps = thread->maps;
352 struct map *map;
353
354 down_read(&maps->lock);
355
356 maps__for_each_entry(maps, map) {
357 err = unwind__prepare_access(thread->maps, map, &initialized);
358 if (err || initialized)
359 break;
360 }
361
362 up_read(&maps->lock);
363
364 return err;
365}
366
367static int thread__prepare_access(struct thread *thread)
368{
369 int err = 0;
370
371 if (dwarf_callchain_users)
372 err = __thread__prepare_access(thread);
373
374 return err;
375}
376
377static int thread__clone_maps(struct thread *thread, struct thread *parent, bool do_maps_clone)
378{
379 /* This is new thread, we share map groups for process. */
380 if (thread->pid_ == parent->pid_)
381 return thread__prepare_access(thread);
382
383 if (thread->maps == parent->maps) {
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 /* But this one is new process, copy maps. */
389 return do_maps_clone ? maps__clone(thread, parent->maps) : 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_maps(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
459void thread__free_stitch_list(struct thread *thread)
460{
461 struct lbr_stitch *lbr_stitch = thread->lbr_stitch;
462 struct stitch_list *pos, *tmp;
463
464 if (!lbr_stitch)
465 return;
466
467 list_for_each_entry_safe(pos, tmp, &lbr_stitch->lists, node) {
468 list_del_init(&pos->node);
469 free(pos);
470 }
471
472 list_for_each_entry_safe(pos, tmp, &lbr_stitch->free_lists, node) {
473 list_del_init(&pos->node);
474 free(pos);
475 }
476
477 zfree(&lbr_stitch->prev_lbr_cursor);
478 zfree(&thread->lbr_stitch);
479}