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