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1#include "callchain.h"
2#include "debug.h"
3#include "event.h"
4#include "evsel.h"
5#include "hist.h"
6#include "machine.h"
7#include "map.h"
8#include "sort.h"
9#include "strlist.h"
10#include "thread.h"
11#include <stdbool.h>
12#include <symbol/kallsyms.h>
13#include "unwind.h"
14
15int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
16{
17 map_groups__init(&machine->kmaps);
18 RB_CLEAR_NODE(&machine->rb_node);
19 INIT_LIST_HEAD(&machine->user_dsos);
20 INIT_LIST_HEAD(&machine->kernel_dsos);
21
22 machine->threads = RB_ROOT;
23 INIT_LIST_HEAD(&machine->dead_threads);
24 machine->last_match = NULL;
25
26 machine->kmaps.machine = machine;
27 machine->pid = pid;
28
29 machine->symbol_filter = NULL;
30 machine->id_hdr_size = 0;
31
32 machine->root_dir = strdup(root_dir);
33 if (machine->root_dir == NULL)
34 return -ENOMEM;
35
36 if (pid != HOST_KERNEL_ID) {
37 struct thread *thread = machine__findnew_thread(machine, 0,
38 pid);
39 char comm[64];
40
41 if (thread == NULL)
42 return -ENOMEM;
43
44 snprintf(comm, sizeof(comm), "[guest/%d]", pid);
45 thread__set_comm(thread, comm, 0);
46 }
47
48 return 0;
49}
50
51struct machine *machine__new_host(void)
52{
53 struct machine *machine = malloc(sizeof(*machine));
54
55 if (machine != NULL) {
56 machine__init(machine, "", HOST_KERNEL_ID);
57
58 if (machine__create_kernel_maps(machine) < 0)
59 goto out_delete;
60 }
61
62 return machine;
63out_delete:
64 free(machine);
65 return NULL;
66}
67
68static void dsos__delete(struct list_head *dsos)
69{
70 struct dso *pos, *n;
71
72 list_for_each_entry_safe(pos, n, dsos, node) {
73 list_del(&pos->node);
74 dso__delete(pos);
75 }
76}
77
78void machine__delete_dead_threads(struct machine *machine)
79{
80 struct thread *n, *t;
81
82 list_for_each_entry_safe(t, n, &machine->dead_threads, node) {
83 list_del(&t->node);
84 thread__delete(t);
85 }
86}
87
88void machine__delete_threads(struct machine *machine)
89{
90 struct rb_node *nd = rb_first(&machine->threads);
91
92 while (nd) {
93 struct thread *t = rb_entry(nd, struct thread, rb_node);
94
95 rb_erase(&t->rb_node, &machine->threads);
96 nd = rb_next(nd);
97 thread__delete(t);
98 }
99}
100
101void machine__exit(struct machine *machine)
102{
103 map_groups__exit(&machine->kmaps);
104 dsos__delete(&machine->user_dsos);
105 dsos__delete(&machine->kernel_dsos);
106 zfree(&machine->root_dir);
107}
108
109void machine__delete(struct machine *machine)
110{
111 machine__exit(machine);
112 free(machine);
113}
114
115void machines__init(struct machines *machines)
116{
117 machine__init(&machines->host, "", HOST_KERNEL_ID);
118 machines->guests = RB_ROOT;
119 machines->symbol_filter = NULL;
120}
121
122void machines__exit(struct machines *machines)
123{
124 machine__exit(&machines->host);
125 /* XXX exit guest */
126}
127
128struct machine *machines__add(struct machines *machines, pid_t pid,
129 const char *root_dir)
130{
131 struct rb_node **p = &machines->guests.rb_node;
132 struct rb_node *parent = NULL;
133 struct machine *pos, *machine = malloc(sizeof(*machine));
134
135 if (machine == NULL)
136 return NULL;
137
138 if (machine__init(machine, root_dir, pid) != 0) {
139 free(machine);
140 return NULL;
141 }
142
143 machine->symbol_filter = machines->symbol_filter;
144
145 while (*p != NULL) {
146 parent = *p;
147 pos = rb_entry(parent, struct machine, rb_node);
148 if (pid < pos->pid)
149 p = &(*p)->rb_left;
150 else
151 p = &(*p)->rb_right;
152 }
153
154 rb_link_node(&machine->rb_node, parent, p);
155 rb_insert_color(&machine->rb_node, &machines->guests);
156
157 return machine;
158}
159
160void machines__set_symbol_filter(struct machines *machines,
161 symbol_filter_t symbol_filter)
162{
163 struct rb_node *nd;
164
165 machines->symbol_filter = symbol_filter;
166 machines->host.symbol_filter = symbol_filter;
167
168 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
169 struct machine *machine = rb_entry(nd, struct machine, rb_node);
170
171 machine->symbol_filter = symbol_filter;
172 }
173}
174
175struct machine *machines__find(struct machines *machines, pid_t pid)
176{
177 struct rb_node **p = &machines->guests.rb_node;
178 struct rb_node *parent = NULL;
179 struct machine *machine;
180 struct machine *default_machine = NULL;
181
182 if (pid == HOST_KERNEL_ID)
183 return &machines->host;
184
185 while (*p != NULL) {
186 parent = *p;
187 machine = rb_entry(parent, struct machine, rb_node);
188 if (pid < machine->pid)
189 p = &(*p)->rb_left;
190 else if (pid > machine->pid)
191 p = &(*p)->rb_right;
192 else
193 return machine;
194 if (!machine->pid)
195 default_machine = machine;
196 }
197
198 return default_machine;
199}
200
201struct machine *machines__findnew(struct machines *machines, pid_t pid)
202{
203 char path[PATH_MAX];
204 const char *root_dir = "";
205 struct machine *machine = machines__find(machines, pid);
206
207 if (machine && (machine->pid == pid))
208 goto out;
209
210 if ((pid != HOST_KERNEL_ID) &&
211 (pid != DEFAULT_GUEST_KERNEL_ID) &&
212 (symbol_conf.guestmount)) {
213 sprintf(path, "%s/%d", symbol_conf.guestmount, pid);
214 if (access(path, R_OK)) {
215 static struct strlist *seen;
216
217 if (!seen)
218 seen = strlist__new(true, NULL);
219
220 if (!strlist__has_entry(seen, path)) {
221 pr_err("Can't access file %s\n", path);
222 strlist__add(seen, path);
223 }
224 machine = NULL;
225 goto out;
226 }
227 root_dir = path;
228 }
229
230 machine = machines__add(machines, pid, root_dir);
231out:
232 return machine;
233}
234
235void machines__process_guests(struct machines *machines,
236 machine__process_t process, void *data)
237{
238 struct rb_node *nd;
239
240 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
241 struct machine *pos = rb_entry(nd, struct machine, rb_node);
242 process(pos, data);
243 }
244}
245
246char *machine__mmap_name(struct machine *machine, char *bf, size_t size)
247{
248 if (machine__is_host(machine))
249 snprintf(bf, size, "[%s]", "kernel.kallsyms");
250 else if (machine__is_default_guest(machine))
251 snprintf(bf, size, "[%s]", "guest.kernel.kallsyms");
252 else {
253 snprintf(bf, size, "[%s.%d]", "guest.kernel.kallsyms",
254 machine->pid);
255 }
256
257 return bf;
258}
259
260void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size)
261{
262 struct rb_node *node;
263 struct machine *machine;
264
265 machines->host.id_hdr_size = id_hdr_size;
266
267 for (node = rb_first(&machines->guests); node; node = rb_next(node)) {
268 machine = rb_entry(node, struct machine, rb_node);
269 machine->id_hdr_size = id_hdr_size;
270 }
271
272 return;
273}
274
275static struct thread *__machine__findnew_thread(struct machine *machine,
276 pid_t pid, pid_t tid,
277 bool create)
278{
279 struct rb_node **p = &machine->threads.rb_node;
280 struct rb_node *parent = NULL;
281 struct thread *th;
282
283 /*
284 * Front-end cache - TID lookups come in blocks,
285 * so most of the time we dont have to look up
286 * the full rbtree:
287 */
288 if (machine->last_match && machine->last_match->tid == tid) {
289 if (pid && pid != machine->last_match->pid_)
290 machine->last_match->pid_ = pid;
291 return machine->last_match;
292 }
293
294 while (*p != NULL) {
295 parent = *p;
296 th = rb_entry(parent, struct thread, rb_node);
297
298 if (th->tid == tid) {
299 machine->last_match = th;
300 if (pid && pid != th->pid_)
301 th->pid_ = pid;
302 return th;
303 }
304
305 if (tid < th->tid)
306 p = &(*p)->rb_left;
307 else
308 p = &(*p)->rb_right;
309 }
310
311 if (!create)
312 return NULL;
313
314 th = thread__new(pid, tid);
315 if (th != NULL) {
316 rb_link_node(&th->rb_node, parent, p);
317 rb_insert_color(&th->rb_node, &machine->threads);
318 machine->last_match = th;
319 }
320
321 return th;
322}
323
324struct thread *machine__findnew_thread(struct machine *machine, pid_t pid,
325 pid_t tid)
326{
327 return __machine__findnew_thread(machine, pid, tid, true);
328}
329
330struct thread *machine__find_thread(struct machine *machine, pid_t pid,
331 pid_t tid)
332{
333 return __machine__findnew_thread(machine, pid, tid, false);
334}
335
336int machine__process_comm_event(struct machine *machine, union perf_event *event,
337 struct perf_sample *sample)
338{
339 struct thread *thread = machine__findnew_thread(machine,
340 event->comm.pid,
341 event->comm.tid);
342
343 if (dump_trace)
344 perf_event__fprintf_comm(event, stdout);
345
346 if (thread == NULL || thread__set_comm(thread, event->comm.comm, sample->time)) {
347 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
348 return -1;
349 }
350
351 return 0;
352}
353
354int machine__process_lost_event(struct machine *machine __maybe_unused,
355 union perf_event *event, struct perf_sample *sample __maybe_unused)
356{
357 dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n",
358 event->lost.id, event->lost.lost);
359 return 0;
360}
361
362struct map *machine__new_module(struct machine *machine, u64 start,
363 const char *filename)
364{
365 struct map *map;
366 struct dso *dso = __dsos__findnew(&machine->kernel_dsos, filename);
367
368 if (dso == NULL)
369 return NULL;
370
371 map = map__new2(start, dso, MAP__FUNCTION);
372 if (map == NULL)
373 return NULL;
374
375 if (machine__is_host(machine))
376 dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE;
377 else
378 dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE;
379 map_groups__insert(&machine->kmaps, map);
380 return map;
381}
382
383size_t machines__fprintf_dsos(struct machines *machines, FILE *fp)
384{
385 struct rb_node *nd;
386 size_t ret = __dsos__fprintf(&machines->host.kernel_dsos, fp) +
387 __dsos__fprintf(&machines->host.user_dsos, fp);
388
389 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
390 struct machine *pos = rb_entry(nd, struct machine, rb_node);
391 ret += __dsos__fprintf(&pos->kernel_dsos, fp);
392 ret += __dsos__fprintf(&pos->user_dsos, fp);
393 }
394
395 return ret;
396}
397
398size_t machine__fprintf_dsos_buildid(struct machine *machine, FILE *fp,
399 bool (skip)(struct dso *dso, int parm), int parm)
400{
401 return __dsos__fprintf_buildid(&machine->kernel_dsos, fp, skip, parm) +
402 __dsos__fprintf_buildid(&machine->user_dsos, fp, skip, parm);
403}
404
405size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp,
406 bool (skip)(struct dso *dso, int parm), int parm)
407{
408 struct rb_node *nd;
409 size_t ret = machine__fprintf_dsos_buildid(&machines->host, fp, skip, parm);
410
411 for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) {
412 struct machine *pos = rb_entry(nd, struct machine, rb_node);
413 ret += machine__fprintf_dsos_buildid(pos, fp, skip, parm);
414 }
415 return ret;
416}
417
418size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
419{
420 int i;
421 size_t printed = 0;
422 struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso;
423
424 if (kdso->has_build_id) {
425 char filename[PATH_MAX];
426 if (dso__build_id_filename(kdso, filename, sizeof(filename)))
427 printed += fprintf(fp, "[0] %s\n", filename);
428 }
429
430 for (i = 0; i < vmlinux_path__nr_entries; ++i)
431 printed += fprintf(fp, "[%d] %s\n",
432 i + kdso->has_build_id, vmlinux_path[i]);
433
434 return printed;
435}
436
437size_t machine__fprintf(struct machine *machine, FILE *fp)
438{
439 size_t ret = 0;
440 struct rb_node *nd;
441
442 for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
443 struct thread *pos = rb_entry(nd, struct thread, rb_node);
444
445 ret += thread__fprintf(pos, fp);
446 }
447
448 return ret;
449}
450
451static struct dso *machine__get_kernel(struct machine *machine)
452{
453 const char *vmlinux_name = NULL;
454 struct dso *kernel;
455
456 if (machine__is_host(machine)) {
457 vmlinux_name = symbol_conf.vmlinux_name;
458 if (!vmlinux_name)
459 vmlinux_name = "[kernel.kallsyms]";
460
461 kernel = dso__kernel_findnew(machine, vmlinux_name,
462 "[kernel]",
463 DSO_TYPE_KERNEL);
464 } else {
465 char bf[PATH_MAX];
466
467 if (machine__is_default_guest(machine))
468 vmlinux_name = symbol_conf.default_guest_vmlinux_name;
469 if (!vmlinux_name)
470 vmlinux_name = machine__mmap_name(machine, bf,
471 sizeof(bf));
472
473 kernel = dso__kernel_findnew(machine, vmlinux_name,
474 "[guest.kernel]",
475 DSO_TYPE_GUEST_KERNEL);
476 }
477
478 if (kernel != NULL && (!kernel->has_build_id))
479 dso__read_running_kernel_build_id(kernel, machine);
480
481 return kernel;
482}
483
484struct process_args {
485 u64 start;
486};
487
488static int symbol__in_kernel(void *arg, const char *name,
489 char type __maybe_unused, u64 start)
490{
491 struct process_args *args = arg;
492
493 if (strchr(name, '['))
494 return 0;
495
496 args->start = start;
497 return 1;
498}
499
500static void machine__get_kallsyms_filename(struct machine *machine, char *buf,
501 size_t bufsz)
502{
503 if (machine__is_default_guest(machine))
504 scnprintf(buf, bufsz, "%s", symbol_conf.default_guest_kallsyms);
505 else
506 scnprintf(buf, bufsz, "%s/proc/kallsyms", machine->root_dir);
507}
508
509/* Figure out the start address of kernel map from /proc/kallsyms */
510static u64 machine__get_kernel_start_addr(struct machine *machine)
511{
512 char filename[PATH_MAX];
513 struct process_args args;
514
515 machine__get_kallsyms_filename(machine, filename, PATH_MAX);
516
517 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
518 return 0;
519
520 if (kallsyms__parse(filename, &args, symbol__in_kernel) <= 0)
521 return 0;
522
523 return args.start;
524}
525
526int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
527{
528 enum map_type type;
529 u64 start = machine__get_kernel_start_addr(machine);
530
531 for (type = 0; type < MAP__NR_TYPES; ++type) {
532 struct kmap *kmap;
533
534 machine->vmlinux_maps[type] = map__new2(start, kernel, type);
535 if (machine->vmlinux_maps[type] == NULL)
536 return -1;
537
538 machine->vmlinux_maps[type]->map_ip =
539 machine->vmlinux_maps[type]->unmap_ip =
540 identity__map_ip;
541 kmap = map__kmap(machine->vmlinux_maps[type]);
542 kmap->kmaps = &machine->kmaps;
543 map_groups__insert(&machine->kmaps,
544 machine->vmlinux_maps[type]);
545 }
546
547 return 0;
548}
549
550void machine__destroy_kernel_maps(struct machine *machine)
551{
552 enum map_type type;
553
554 for (type = 0; type < MAP__NR_TYPES; ++type) {
555 struct kmap *kmap;
556
557 if (machine->vmlinux_maps[type] == NULL)
558 continue;
559
560 kmap = map__kmap(machine->vmlinux_maps[type]);
561 map_groups__remove(&machine->kmaps,
562 machine->vmlinux_maps[type]);
563 if (kmap->ref_reloc_sym) {
564 /*
565 * ref_reloc_sym is shared among all maps, so free just
566 * on one of them.
567 */
568 if (type == MAP__FUNCTION) {
569 zfree((char **)&kmap->ref_reloc_sym->name);
570 zfree(&kmap->ref_reloc_sym);
571 } else
572 kmap->ref_reloc_sym = NULL;
573 }
574
575 map__delete(machine->vmlinux_maps[type]);
576 machine->vmlinux_maps[type] = NULL;
577 }
578}
579
580int machines__create_guest_kernel_maps(struct machines *machines)
581{
582 int ret = 0;
583 struct dirent **namelist = NULL;
584 int i, items = 0;
585 char path[PATH_MAX];
586 pid_t pid;
587 char *endp;
588
589 if (symbol_conf.default_guest_vmlinux_name ||
590 symbol_conf.default_guest_modules ||
591 symbol_conf.default_guest_kallsyms) {
592 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
593 }
594
595 if (symbol_conf.guestmount) {
596 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
597 if (items <= 0)
598 return -ENOENT;
599 for (i = 0; i < items; i++) {
600 if (!isdigit(namelist[i]->d_name[0])) {
601 /* Filter out . and .. */
602 continue;
603 }
604 pid = (pid_t)strtol(namelist[i]->d_name, &endp, 10);
605 if ((*endp != '\0') ||
606 (endp == namelist[i]->d_name) ||
607 (errno == ERANGE)) {
608 pr_debug("invalid directory (%s). Skipping.\n",
609 namelist[i]->d_name);
610 continue;
611 }
612 sprintf(path, "%s/%s/proc/kallsyms",
613 symbol_conf.guestmount,
614 namelist[i]->d_name);
615 ret = access(path, R_OK);
616 if (ret) {
617 pr_debug("Can't access file %s\n", path);
618 goto failure;
619 }
620 machines__create_kernel_maps(machines, pid);
621 }
622failure:
623 free(namelist);
624 }
625
626 return ret;
627}
628
629void machines__destroy_kernel_maps(struct machines *machines)
630{
631 struct rb_node *next = rb_first(&machines->guests);
632
633 machine__destroy_kernel_maps(&machines->host);
634
635 while (next) {
636 struct machine *pos = rb_entry(next, struct machine, rb_node);
637
638 next = rb_next(&pos->rb_node);
639 rb_erase(&pos->rb_node, &machines->guests);
640 machine__delete(pos);
641 }
642}
643
644int machines__create_kernel_maps(struct machines *machines, pid_t pid)
645{
646 struct machine *machine = machines__findnew(machines, pid);
647
648 if (machine == NULL)
649 return -1;
650
651 return machine__create_kernel_maps(machine);
652}
653
654int machine__load_kallsyms(struct machine *machine, const char *filename,
655 enum map_type type, symbol_filter_t filter)
656{
657 struct map *map = machine->vmlinux_maps[type];
658 int ret = dso__load_kallsyms(map->dso, filename, map, filter);
659
660 if (ret > 0) {
661 dso__set_loaded(map->dso, type);
662 /*
663 * Since /proc/kallsyms will have multiple sessions for the
664 * kernel, with modules between them, fixup the end of all
665 * sections.
666 */
667 __map_groups__fixup_end(&machine->kmaps, type);
668 }
669
670 return ret;
671}
672
673int machine__load_vmlinux_path(struct machine *machine, enum map_type type,
674 symbol_filter_t filter)
675{
676 struct map *map = machine->vmlinux_maps[type];
677 int ret = dso__load_vmlinux_path(map->dso, map, filter);
678
679 if (ret > 0)
680 dso__set_loaded(map->dso, type);
681
682 return ret;
683}
684
685static void map_groups__fixup_end(struct map_groups *mg)
686{
687 int i;
688 for (i = 0; i < MAP__NR_TYPES; ++i)
689 __map_groups__fixup_end(mg, i);
690}
691
692static char *get_kernel_version(const char *root_dir)
693{
694 char version[PATH_MAX];
695 FILE *file;
696 char *name, *tmp;
697 const char *prefix = "Linux version ";
698
699 sprintf(version, "%s/proc/version", root_dir);
700 file = fopen(version, "r");
701 if (!file)
702 return NULL;
703
704 version[0] = '\0';
705 tmp = fgets(version, sizeof(version), file);
706 fclose(file);
707
708 name = strstr(version, prefix);
709 if (!name)
710 return NULL;
711 name += strlen(prefix);
712 tmp = strchr(name, ' ');
713 if (tmp)
714 *tmp = '\0';
715
716 return strdup(name);
717}
718
719static int map_groups__set_modules_path_dir(struct map_groups *mg,
720 const char *dir_name, int depth)
721{
722 struct dirent *dent;
723 DIR *dir = opendir(dir_name);
724 int ret = 0;
725
726 if (!dir) {
727 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
728 return -1;
729 }
730
731 while ((dent = readdir(dir)) != NULL) {
732 char path[PATH_MAX];
733 struct stat st;
734
735 /*sshfs might return bad dent->d_type, so we have to stat*/
736 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name);
737 if (stat(path, &st))
738 continue;
739
740 if (S_ISDIR(st.st_mode)) {
741 if (!strcmp(dent->d_name, ".") ||
742 !strcmp(dent->d_name, ".."))
743 continue;
744
745 /* Do not follow top-level source and build symlinks */
746 if (depth == 0) {
747 if (!strcmp(dent->d_name, "source") ||
748 !strcmp(dent->d_name, "build"))
749 continue;
750 }
751
752 ret = map_groups__set_modules_path_dir(mg, path,
753 depth + 1);
754 if (ret < 0)
755 goto out;
756 } else {
757 char *dot = strrchr(dent->d_name, '.'),
758 dso_name[PATH_MAX];
759 struct map *map;
760 char *long_name;
761
762 if (dot == NULL || strcmp(dot, ".ko"))
763 continue;
764 snprintf(dso_name, sizeof(dso_name), "[%.*s]",
765 (int)(dot - dent->d_name), dent->d_name);
766
767 strxfrchar(dso_name, '-', '_');
768 map = map_groups__find_by_name(mg, MAP__FUNCTION,
769 dso_name);
770 if (map == NULL)
771 continue;
772
773 long_name = strdup(path);
774 if (long_name == NULL) {
775 ret = -1;
776 goto out;
777 }
778 dso__set_long_name(map->dso, long_name, true);
779 dso__kernel_module_get_build_id(map->dso, "");
780 }
781 }
782
783out:
784 closedir(dir);
785 return ret;
786}
787
788static int machine__set_modules_path(struct machine *machine)
789{
790 char *version;
791 char modules_path[PATH_MAX];
792
793 version = get_kernel_version(machine->root_dir);
794 if (!version)
795 return -1;
796
797 snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s",
798 machine->root_dir, version);
799 free(version);
800
801 return map_groups__set_modules_path_dir(&machine->kmaps, modules_path, 0);
802}
803
804static int machine__create_module(void *arg, const char *name, u64 start)
805{
806 struct machine *machine = arg;
807 struct map *map;
808
809 map = machine__new_module(machine, start, name);
810 if (map == NULL)
811 return -1;
812
813 dso__kernel_module_get_build_id(map->dso, machine->root_dir);
814
815 return 0;
816}
817
818static int machine__create_modules(struct machine *machine)
819{
820 const char *modules;
821 char path[PATH_MAX];
822
823 if (machine__is_default_guest(machine)) {
824 modules = symbol_conf.default_guest_modules;
825 } else {
826 snprintf(path, PATH_MAX, "%s/proc/modules", machine->root_dir);
827 modules = path;
828 }
829
830 if (symbol__restricted_filename(modules, "/proc/modules"))
831 return -1;
832
833 if (modules__parse(modules, machine, machine__create_module))
834 return -1;
835
836 if (!machine__set_modules_path(machine))
837 return 0;
838
839 pr_debug("Problems setting modules path maps, continuing anyway...\n");
840
841 return 0;
842}
843
844const char *ref_reloc_sym_names[] = {"_text", "_stext", NULL};
845
846int machine__create_kernel_maps(struct machine *machine)
847{
848 struct dso *kernel = machine__get_kernel(machine);
849 char filename[PATH_MAX];
850 const char *name;
851 u64 addr = 0;
852 int i;
853
854 machine__get_kallsyms_filename(machine, filename, PATH_MAX);
855
856 for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) {
857 addr = kallsyms__get_function_start(filename, name);
858 if (addr)
859 break;
860 }
861 if (!addr)
862 return -1;
863
864 if (kernel == NULL ||
865 __machine__create_kernel_maps(machine, kernel) < 0)
866 return -1;
867
868 if (symbol_conf.use_modules && machine__create_modules(machine) < 0) {
869 if (machine__is_host(machine))
870 pr_debug("Problems creating module maps, "
871 "continuing anyway...\n");
872 else
873 pr_debug("Problems creating module maps for guest %d, "
874 "continuing anyway...\n", machine->pid);
875 }
876
877 /*
878 * Now that we have all the maps created, just set the ->end of them:
879 */
880 map_groups__fixup_end(&machine->kmaps);
881
882 if (maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, name,
883 addr)) {
884 machine__destroy_kernel_maps(machine);
885 return -1;
886 }
887
888 return 0;
889}
890
891static void machine__set_kernel_mmap_len(struct machine *machine,
892 union perf_event *event)
893{
894 int i;
895
896 for (i = 0; i < MAP__NR_TYPES; i++) {
897 machine->vmlinux_maps[i]->start = event->mmap.start;
898 machine->vmlinux_maps[i]->end = (event->mmap.start +
899 event->mmap.len);
900 /*
901 * Be a bit paranoid here, some perf.data file came with
902 * a zero sized synthesized MMAP event for the kernel.
903 */
904 if (machine->vmlinux_maps[i]->end == 0)
905 machine->vmlinux_maps[i]->end = ~0ULL;
906 }
907}
908
909static bool machine__uses_kcore(struct machine *machine)
910{
911 struct dso *dso;
912
913 list_for_each_entry(dso, &machine->kernel_dsos, node) {
914 if (dso__is_kcore(dso))
915 return true;
916 }
917
918 return false;
919}
920
921static int machine__process_kernel_mmap_event(struct machine *machine,
922 union perf_event *event)
923{
924 struct map *map;
925 char kmmap_prefix[PATH_MAX];
926 enum dso_kernel_type kernel_type;
927 bool is_kernel_mmap;
928
929 /* If we have maps from kcore then we do not need or want any others */
930 if (machine__uses_kcore(machine))
931 return 0;
932
933 machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix));
934 if (machine__is_host(machine))
935 kernel_type = DSO_TYPE_KERNEL;
936 else
937 kernel_type = DSO_TYPE_GUEST_KERNEL;
938
939 is_kernel_mmap = memcmp(event->mmap.filename,
940 kmmap_prefix,
941 strlen(kmmap_prefix) - 1) == 0;
942 if (event->mmap.filename[0] == '/' ||
943 (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
944
945 char short_module_name[1024];
946 char *name, *dot;
947
948 if (event->mmap.filename[0] == '/') {
949 name = strrchr(event->mmap.filename, '/');
950 if (name == NULL)
951 goto out_problem;
952
953 ++name; /* skip / */
954 dot = strrchr(name, '.');
955 if (dot == NULL)
956 goto out_problem;
957 snprintf(short_module_name, sizeof(short_module_name),
958 "[%.*s]", (int)(dot - name), name);
959 strxfrchar(short_module_name, '-', '_');
960 } else
961 strcpy(short_module_name, event->mmap.filename);
962
963 map = machine__new_module(machine, event->mmap.start,
964 event->mmap.filename);
965 if (map == NULL)
966 goto out_problem;
967
968 name = strdup(short_module_name);
969 if (name == NULL)
970 goto out_problem;
971
972 dso__set_short_name(map->dso, name, true);
973 map->end = map->start + event->mmap.len;
974 } else if (is_kernel_mmap) {
975 const char *symbol_name = (event->mmap.filename +
976 strlen(kmmap_prefix));
977 /*
978 * Should be there already, from the build-id table in
979 * the header.
980 */
981 struct dso *kernel = __dsos__findnew(&machine->kernel_dsos,
982 kmmap_prefix);
983 if (kernel == NULL)
984 goto out_problem;
985
986 kernel->kernel = kernel_type;
987 if (__machine__create_kernel_maps(machine, kernel) < 0)
988 goto out_problem;
989
990 machine__set_kernel_mmap_len(machine, event);
991
992 /*
993 * Avoid using a zero address (kptr_restrict) for the ref reloc
994 * symbol. Effectively having zero here means that at record
995 * time /proc/sys/kernel/kptr_restrict was non zero.
996 */
997 if (event->mmap.pgoff != 0) {
998 maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps,
999 symbol_name,
1000 event->mmap.pgoff);
1001 }
1002
1003 if (machine__is_default_guest(machine)) {
1004 /*
1005 * preload dso of guest kernel and modules
1006 */
1007 dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION],
1008 NULL);
1009 }
1010 }
1011 return 0;
1012out_problem:
1013 return -1;
1014}
1015
1016int machine__process_mmap2_event(struct machine *machine,
1017 union perf_event *event,
1018 struct perf_sample *sample __maybe_unused)
1019{
1020 u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1021 struct thread *thread;
1022 struct map *map;
1023 enum map_type type;
1024 int ret = 0;
1025
1026 if (dump_trace)
1027 perf_event__fprintf_mmap2(event, stdout);
1028
1029 if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1030 cpumode == PERF_RECORD_MISC_KERNEL) {
1031 ret = machine__process_kernel_mmap_event(machine, event);
1032 if (ret < 0)
1033 goto out_problem;
1034 return 0;
1035 }
1036
1037 thread = machine__findnew_thread(machine, event->mmap2.pid,
1038 event->mmap2.tid);
1039 if (thread == NULL)
1040 goto out_problem;
1041
1042 if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1043 type = MAP__VARIABLE;
1044 else
1045 type = MAP__FUNCTION;
1046
1047 map = map__new(&machine->user_dsos, event->mmap2.start,
1048 event->mmap2.len, event->mmap2.pgoff,
1049 event->mmap2.pid, event->mmap2.maj,
1050 event->mmap2.min, event->mmap2.ino,
1051 event->mmap2.ino_generation,
1052 event->mmap2.filename, type);
1053
1054 if (map == NULL)
1055 goto out_problem;
1056
1057 thread__insert_map(thread, map);
1058 return 0;
1059
1060out_problem:
1061 dump_printf("problem processing PERF_RECORD_MMAP2, skipping event.\n");
1062 return 0;
1063}
1064
1065int machine__process_mmap_event(struct machine *machine, union perf_event *event,
1066 struct perf_sample *sample __maybe_unused)
1067{
1068 u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1069 struct thread *thread;
1070 struct map *map;
1071 enum map_type type;
1072 int ret = 0;
1073
1074 if (dump_trace)
1075 perf_event__fprintf_mmap(event, stdout);
1076
1077 if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1078 cpumode == PERF_RECORD_MISC_KERNEL) {
1079 ret = machine__process_kernel_mmap_event(machine, event);
1080 if (ret < 0)
1081 goto out_problem;
1082 return 0;
1083 }
1084
1085 thread = machine__findnew_thread(machine, event->mmap.pid,
1086 event->mmap.tid);
1087 if (thread == NULL)
1088 goto out_problem;
1089
1090 if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA)
1091 type = MAP__VARIABLE;
1092 else
1093 type = MAP__FUNCTION;
1094
1095 map = map__new(&machine->user_dsos, event->mmap.start,
1096 event->mmap.len, event->mmap.pgoff,
1097 event->mmap.pid, 0, 0, 0, 0,
1098 event->mmap.filename,
1099 type);
1100
1101 if (map == NULL)
1102 goto out_problem;
1103
1104 thread__insert_map(thread, map);
1105 return 0;
1106
1107out_problem:
1108 dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
1109 return 0;
1110}
1111
1112static void machine__remove_thread(struct machine *machine, struct thread *th)
1113{
1114 machine->last_match = NULL;
1115 rb_erase(&th->rb_node, &machine->threads);
1116 /*
1117 * We may have references to this thread, for instance in some hist_entry
1118 * instances, so just move them to a separate list.
1119 */
1120 list_add_tail(&th->node, &machine->dead_threads);
1121}
1122
1123int machine__process_fork_event(struct machine *machine, union perf_event *event,
1124 struct perf_sample *sample)
1125{
1126 struct thread *thread = machine__find_thread(machine,
1127 event->fork.pid,
1128 event->fork.tid);
1129 struct thread *parent = machine__findnew_thread(machine,
1130 event->fork.ppid,
1131 event->fork.ptid);
1132
1133 /* if a thread currently exists for the thread id remove it */
1134 if (thread != NULL)
1135 machine__remove_thread(machine, thread);
1136
1137 thread = machine__findnew_thread(machine, event->fork.pid,
1138 event->fork.tid);
1139 if (dump_trace)
1140 perf_event__fprintf_task(event, stdout);
1141
1142 if (thread == NULL || parent == NULL ||
1143 thread__fork(thread, parent, sample->time) < 0) {
1144 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
1145 return -1;
1146 }
1147
1148 return 0;
1149}
1150
1151int machine__process_exit_event(struct machine *machine, union perf_event *event,
1152 struct perf_sample *sample __maybe_unused)
1153{
1154 struct thread *thread = machine__find_thread(machine,
1155 event->fork.pid,
1156 event->fork.tid);
1157
1158 if (dump_trace)
1159 perf_event__fprintf_task(event, stdout);
1160
1161 if (thread != NULL)
1162 thread__exited(thread);
1163
1164 return 0;
1165}
1166
1167int machine__process_event(struct machine *machine, union perf_event *event,
1168 struct perf_sample *sample)
1169{
1170 int ret;
1171
1172 switch (event->header.type) {
1173 case PERF_RECORD_COMM:
1174 ret = machine__process_comm_event(machine, event, sample); break;
1175 case PERF_RECORD_MMAP:
1176 ret = machine__process_mmap_event(machine, event, sample); break;
1177 case PERF_RECORD_MMAP2:
1178 ret = machine__process_mmap2_event(machine, event, sample); break;
1179 case PERF_RECORD_FORK:
1180 ret = machine__process_fork_event(machine, event, sample); break;
1181 case PERF_RECORD_EXIT:
1182 ret = machine__process_exit_event(machine, event, sample); break;
1183 case PERF_RECORD_LOST:
1184 ret = machine__process_lost_event(machine, event, sample); break;
1185 default:
1186 ret = -1;
1187 break;
1188 }
1189
1190 return ret;
1191}
1192
1193static bool symbol__match_regex(struct symbol *sym, regex_t *regex)
1194{
1195 if (sym->name && !regexec(regex, sym->name, 0, NULL, 0))
1196 return 1;
1197 return 0;
1198}
1199
1200static void ip__resolve_ams(struct machine *machine, struct thread *thread,
1201 struct addr_map_symbol *ams,
1202 u64 ip)
1203{
1204 struct addr_location al;
1205
1206 memset(&al, 0, sizeof(al));
1207 /*
1208 * We cannot use the header.misc hint to determine whether a
1209 * branch stack address is user, kernel, guest, hypervisor.
1210 * Branches may straddle the kernel/user/hypervisor boundaries.
1211 * Thus, we have to try consecutively until we find a match
1212 * or else, the symbol is unknown
1213 */
1214 thread__find_cpumode_addr_location(thread, machine, MAP__FUNCTION, ip, &al);
1215
1216 ams->addr = ip;
1217 ams->al_addr = al.addr;
1218 ams->sym = al.sym;
1219 ams->map = al.map;
1220}
1221
1222static void ip__resolve_data(struct machine *machine, struct thread *thread,
1223 u8 m, struct addr_map_symbol *ams, u64 addr)
1224{
1225 struct addr_location al;
1226
1227 memset(&al, 0, sizeof(al));
1228
1229 thread__find_addr_location(thread, machine, m, MAP__VARIABLE, addr,
1230 &al);
1231 ams->addr = addr;
1232 ams->al_addr = al.addr;
1233 ams->sym = al.sym;
1234 ams->map = al.map;
1235}
1236
1237struct mem_info *sample__resolve_mem(struct perf_sample *sample,
1238 struct addr_location *al)
1239{
1240 struct mem_info *mi = zalloc(sizeof(*mi));
1241
1242 if (!mi)
1243 return NULL;
1244
1245 ip__resolve_ams(al->machine, al->thread, &mi->iaddr, sample->ip);
1246 ip__resolve_data(al->machine, al->thread, al->cpumode,
1247 &mi->daddr, sample->addr);
1248 mi->data_src.val = sample->data_src;
1249
1250 return mi;
1251}
1252
1253struct branch_info *sample__resolve_bstack(struct perf_sample *sample,
1254 struct addr_location *al)
1255{
1256 unsigned int i;
1257 const struct branch_stack *bs = sample->branch_stack;
1258 struct branch_info *bi = calloc(bs->nr, sizeof(struct branch_info));
1259
1260 if (!bi)
1261 return NULL;
1262
1263 for (i = 0; i < bs->nr; i++) {
1264 ip__resolve_ams(al->machine, al->thread, &bi[i].to, bs->entries[i].to);
1265 ip__resolve_ams(al->machine, al->thread, &bi[i].from, bs->entries[i].from);
1266 bi[i].flags = bs->entries[i].flags;
1267 }
1268 return bi;
1269}
1270
1271static int machine__resolve_callchain_sample(struct machine *machine,
1272 struct thread *thread,
1273 struct ip_callchain *chain,
1274 struct symbol **parent,
1275 struct addr_location *root_al,
1276 int max_stack)
1277{
1278 u8 cpumode = PERF_RECORD_MISC_USER;
1279 int chain_nr = min(max_stack, (int)chain->nr);
1280 int i;
1281 int err;
1282
1283 callchain_cursor_reset(&callchain_cursor);
1284
1285 if (chain->nr > PERF_MAX_STACK_DEPTH) {
1286 pr_warning("corrupted callchain. skipping...\n");
1287 return 0;
1288 }
1289
1290 for (i = 0; i < chain_nr; i++) {
1291 u64 ip;
1292 struct addr_location al;
1293
1294 if (callchain_param.order == ORDER_CALLEE)
1295 ip = chain->ips[i];
1296 else
1297 ip = chain->ips[chain->nr - i - 1];
1298
1299 if (ip >= PERF_CONTEXT_MAX) {
1300 switch (ip) {
1301 case PERF_CONTEXT_HV:
1302 cpumode = PERF_RECORD_MISC_HYPERVISOR;
1303 break;
1304 case PERF_CONTEXT_KERNEL:
1305 cpumode = PERF_RECORD_MISC_KERNEL;
1306 break;
1307 case PERF_CONTEXT_USER:
1308 cpumode = PERF_RECORD_MISC_USER;
1309 break;
1310 default:
1311 pr_debug("invalid callchain context: "
1312 "%"PRId64"\n", (s64) ip);
1313 /*
1314 * It seems the callchain is corrupted.
1315 * Discard all.
1316 */
1317 callchain_cursor_reset(&callchain_cursor);
1318 return 0;
1319 }
1320 continue;
1321 }
1322
1323 al.filtered = 0;
1324 thread__find_addr_location(thread, machine, cpumode,
1325 MAP__FUNCTION, ip, &al);
1326 if (al.sym != NULL) {
1327 if (sort__has_parent && !*parent &&
1328 symbol__match_regex(al.sym, &parent_regex))
1329 *parent = al.sym;
1330 else if (have_ignore_callees && root_al &&
1331 symbol__match_regex(al.sym, &ignore_callees_regex)) {
1332 /* Treat this symbol as the root,
1333 forgetting its callees. */
1334 *root_al = al;
1335 callchain_cursor_reset(&callchain_cursor);
1336 }
1337 }
1338
1339 err = callchain_cursor_append(&callchain_cursor,
1340 ip, al.map, al.sym);
1341 if (err)
1342 return err;
1343 }
1344
1345 return 0;
1346}
1347
1348static int unwind_entry(struct unwind_entry *entry, void *arg)
1349{
1350 struct callchain_cursor *cursor = arg;
1351 return callchain_cursor_append(cursor, entry->ip,
1352 entry->map, entry->sym);
1353}
1354
1355int machine__resolve_callchain(struct machine *machine,
1356 struct perf_evsel *evsel,
1357 struct thread *thread,
1358 struct perf_sample *sample,
1359 struct symbol **parent,
1360 struct addr_location *root_al,
1361 int max_stack)
1362{
1363 int ret;
1364
1365 ret = machine__resolve_callchain_sample(machine, thread,
1366 sample->callchain, parent,
1367 root_al, max_stack);
1368 if (ret)
1369 return ret;
1370
1371 /* Can we do dwarf post unwind? */
1372 if (!((evsel->attr.sample_type & PERF_SAMPLE_REGS_USER) &&
1373 (evsel->attr.sample_type & PERF_SAMPLE_STACK_USER)))
1374 return 0;
1375
1376 /* Bail out if nothing was captured. */
1377 if ((!sample->user_regs.regs) ||
1378 (!sample->user_stack.size))
1379 return 0;
1380
1381 return unwind__get_entries(unwind_entry, &callchain_cursor, machine,
1382 thread, sample, max_stack);
1383
1384}
1385
1386int machine__for_each_thread(struct machine *machine,
1387 int (*fn)(struct thread *thread, void *p),
1388 void *priv)
1389{
1390 struct rb_node *nd;
1391 struct thread *thread;
1392 int rc = 0;
1393
1394 for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) {
1395 thread = rb_entry(nd, struct thread, rb_node);
1396 rc = fn(thread, priv);
1397 if (rc != 0)
1398 return rc;
1399 }
1400
1401 list_for_each_entry(thread, &machine->dead_threads, node) {
1402 rc = fn(thread, priv);
1403 if (rc != 0)
1404 return rc;
1405 }
1406 return rc;
1407}
1408
1409int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool,
1410 struct target *target, struct thread_map *threads,
1411 perf_event__handler_t process, bool data_mmap)
1412{
1413 if (target__has_task(target))
1414 return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap);
1415 else if (target__has_cpu(target))
1416 return perf_event__synthesize_threads(tool, process, machine, data_mmap);
1417 /* command specified */
1418 return 0;
1419}