1 // SPDX-License-Identifier: GPL-2.0
16 #include "map_symbol.h"
18 #include "mem-events.h"
28 #include <sys/types.h>
32 #include "linux/hash.h"
34 #include "bpf-event.h"
35 #include <internal/lib.h> // page_size
37 #include <linux/ctype.h>
38 #include <symbol/kallsyms.h>
39 #include <linux/mman.h>
40 #include <linux/string.h>
41 #include <linux/zalloc.h>
43 static void __machine__remove_thread(struct machine *machine, struct thread *th, bool lock);
45 static void dsos__init(struct dsos *dsos)
47 INIT_LIST_HEAD(&dsos->head);
49 init_rwsem(&dsos->lock);
52 static void machine__threads_init(struct machine *machine)
56 for (i = 0; i < THREADS__TABLE_SIZE; i++) {
57 struct threads *threads = &machine->threads[i];
58 threads->entries = RB_ROOT_CACHED;
59 init_rwsem(&threads->lock);
61 INIT_LIST_HEAD(&threads->dead);
62 threads->last_match = NULL;
66 static int machine__set_mmap_name(struct machine *machine)
68 if (machine__is_host(machine))
69 machine->mmap_name = strdup("[kernel.kallsyms]");
70 else if (machine__is_default_guest(machine))
71 machine->mmap_name = strdup("[guest.kernel.kallsyms]");
72 else if (asprintf(&machine->mmap_name, "[guest.kernel.kallsyms.%d]",
74 machine->mmap_name = NULL;
76 return machine->mmap_name ? 0 : -ENOMEM;
79 int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
83 memset(machine, 0, sizeof(*machine));
84 map_groups__init(&machine->kmaps, machine);
85 RB_CLEAR_NODE(&machine->rb_node);
86 dsos__init(&machine->dsos);
88 machine__threads_init(machine);
90 machine->vdso_info = NULL;
95 machine->id_hdr_size = 0;
96 machine->kptr_restrict_warned = false;
97 machine->comm_exec = false;
98 machine->kernel_start = 0;
99 machine->vmlinux_map = NULL;
101 machine->root_dir = strdup(root_dir);
102 if (machine->root_dir == NULL)
105 if (machine__set_mmap_name(machine))
108 if (pid != HOST_KERNEL_ID) {
109 struct thread *thread = machine__findnew_thread(machine, -1,
116 snprintf(comm, sizeof(comm), "[guest/%d]", pid);
117 thread__set_comm(thread, comm, 0);
121 machine->current_tid = NULL;
126 zfree(&machine->root_dir);
127 zfree(&machine->mmap_name);
132 struct machine *machine__new_host(void)
134 struct machine *machine = malloc(sizeof(*machine));
136 if (machine != NULL) {
137 machine__init(machine, "", HOST_KERNEL_ID);
139 if (machine__create_kernel_maps(machine) < 0)
149 struct machine *machine__new_kallsyms(void)
151 struct machine *machine = machine__new_host();
154 * 1) We should switch to machine__load_kallsyms(), i.e. not explicitly
155 * ask for not using the kcore parsing code, once this one is fixed
156 * to create a map per module.
158 if (machine && machine__load_kallsyms(machine, "/proc/kallsyms") <= 0) {
159 machine__delete(machine);
166 static void dsos__purge(struct dsos *dsos)
170 down_write(&dsos->lock);
172 list_for_each_entry_safe(pos, n, &dsos->head, node) {
173 RB_CLEAR_NODE(&pos->rb_node);
175 list_del_init(&pos->node);
179 up_write(&dsos->lock);
182 static void dsos__exit(struct dsos *dsos)
185 exit_rwsem(&dsos->lock);
188 void machine__delete_threads(struct machine *machine)
193 for (i = 0; i < THREADS__TABLE_SIZE; i++) {
194 struct threads *threads = &machine->threads[i];
195 down_write(&threads->lock);
196 nd = rb_first_cached(&threads->entries);
198 struct thread *t = rb_entry(nd, struct thread, rb_node);
201 __machine__remove_thread(machine, t, false);
203 up_write(&threads->lock);
207 void machine__exit(struct machine *machine)
214 machine__destroy_kernel_maps(machine);
215 map_groups__exit(&machine->kmaps);
216 dsos__exit(&machine->dsos);
217 machine__exit_vdso(machine);
218 zfree(&machine->root_dir);
219 zfree(&machine->mmap_name);
220 zfree(&machine->current_tid);
222 for (i = 0; i < THREADS__TABLE_SIZE; i++) {
223 struct threads *threads = &machine->threads[i];
224 struct thread *thread, *n;
226 * Forget about the dead, at this point whatever threads were
227 * left in the dead lists better have a reference count taken
228 * by who is using them, and then, when they drop those references
229 * and it finally hits zero, thread__put() will check and see that
230 * its not in the dead threads list and will not try to remove it
231 * from there, just calling thread__delete() straight away.
233 list_for_each_entry_safe(thread, n, &threads->dead, node)
234 list_del_init(&thread->node);
236 exit_rwsem(&threads->lock);
240 void machine__delete(struct machine *machine)
243 machine__exit(machine);
248 void machines__init(struct machines *machines)
250 machine__init(&machines->host, "", HOST_KERNEL_ID);
251 machines->guests = RB_ROOT_CACHED;
254 void machines__exit(struct machines *machines)
256 machine__exit(&machines->host);
260 struct machine *machines__add(struct machines *machines, pid_t pid,
261 const char *root_dir)
263 struct rb_node **p = &machines->guests.rb_root.rb_node;
264 struct rb_node *parent = NULL;
265 struct machine *pos, *machine = malloc(sizeof(*machine));
266 bool leftmost = true;
271 if (machine__init(machine, root_dir, pid) != 0) {
278 pos = rb_entry(parent, struct machine, rb_node);
287 rb_link_node(&machine->rb_node, parent, p);
288 rb_insert_color_cached(&machine->rb_node, &machines->guests, leftmost);
293 void machines__set_comm_exec(struct machines *machines, bool comm_exec)
297 machines->host.comm_exec = comm_exec;
299 for (nd = rb_first_cached(&machines->guests); nd; nd = rb_next(nd)) {
300 struct machine *machine = rb_entry(nd, struct machine, rb_node);
302 machine->comm_exec = comm_exec;
306 struct machine *machines__find(struct machines *machines, pid_t pid)
308 struct rb_node **p = &machines->guests.rb_root.rb_node;
309 struct rb_node *parent = NULL;
310 struct machine *machine;
311 struct machine *default_machine = NULL;
313 if (pid == HOST_KERNEL_ID)
314 return &machines->host;
318 machine = rb_entry(parent, struct machine, rb_node);
319 if (pid < machine->pid)
321 else if (pid > machine->pid)
326 default_machine = machine;
329 return default_machine;
332 struct machine *machines__findnew(struct machines *machines, pid_t pid)
335 const char *root_dir = "";
336 struct machine *machine = machines__find(machines, pid);
338 if (machine && (machine->pid == pid))
341 if ((pid != HOST_KERNEL_ID) &&
342 (pid != DEFAULT_GUEST_KERNEL_ID) &&
343 (symbol_conf.guestmount)) {
344 sprintf(path, "%s/%d", symbol_conf.guestmount, pid);
345 if (access(path, R_OK)) {
346 static struct strlist *seen;
349 seen = strlist__new(NULL, NULL);
351 if (!strlist__has_entry(seen, path)) {
352 pr_err("Can't access file %s\n", path);
353 strlist__add(seen, path);
361 machine = machines__add(machines, pid, root_dir);
366 void machines__process_guests(struct machines *machines,
367 machine__process_t process, void *data)
371 for (nd = rb_first_cached(&machines->guests); nd; nd = rb_next(nd)) {
372 struct machine *pos = rb_entry(nd, struct machine, rb_node);
377 void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size)
379 struct rb_node *node;
380 struct machine *machine;
382 machines->host.id_hdr_size = id_hdr_size;
384 for (node = rb_first_cached(&machines->guests); node;
385 node = rb_next(node)) {
386 machine = rb_entry(node, struct machine, rb_node);
387 machine->id_hdr_size = id_hdr_size;
393 static void machine__update_thread_pid(struct machine *machine,
394 struct thread *th, pid_t pid)
396 struct thread *leader;
398 if (pid == th->pid_ || pid == -1 || th->pid_ != -1)
403 if (th->pid_ == th->tid)
406 leader = __machine__findnew_thread(machine, th->pid_, th->pid_);
411 leader->mg = map_groups__new(machine);
416 if (th->mg == leader->mg)
421 * Maps are created from MMAP events which provide the pid and
422 * tid. Consequently there never should be any maps on a thread
423 * with an unknown pid. Just print an error if there are.
425 if (!map_groups__empty(th->mg))
426 pr_err("Discarding thread maps for %d:%d\n",
428 map_groups__put(th->mg);
431 th->mg = map_groups__get(leader->mg);
436 pr_err("Failed to join map groups for %d:%d\n", th->pid_, th->tid);
441 * Front-end cache - TID lookups come in blocks,
442 * so most of the time we dont have to look up
445 static struct thread*
446 __threads__get_last_match(struct threads *threads, struct machine *machine,
451 th = threads->last_match;
453 if (th->tid == tid) {
454 machine__update_thread_pid(machine, th, pid);
455 return thread__get(th);
458 threads->last_match = NULL;
464 static struct thread*
465 threads__get_last_match(struct threads *threads, struct machine *machine,
468 struct thread *th = NULL;
470 if (perf_singlethreaded)
471 th = __threads__get_last_match(threads, machine, pid, tid);
477 __threads__set_last_match(struct threads *threads, struct thread *th)
479 threads->last_match = th;
483 threads__set_last_match(struct threads *threads, struct thread *th)
485 if (perf_singlethreaded)
486 __threads__set_last_match(threads, th);
490 * Caller must eventually drop thread->refcnt returned with a successful
491 * lookup/new thread inserted.
493 static struct thread *____machine__findnew_thread(struct machine *machine,
494 struct threads *threads,
495 pid_t pid, pid_t tid,
498 struct rb_node **p = &threads->entries.rb_root.rb_node;
499 struct rb_node *parent = NULL;
501 bool leftmost = true;
503 th = threads__get_last_match(threads, machine, pid, tid);
509 th = rb_entry(parent, struct thread, rb_node);
511 if (th->tid == tid) {
512 threads__set_last_match(threads, th);
513 machine__update_thread_pid(machine, th, pid);
514 return thread__get(th);
528 th = thread__new(pid, tid);
530 rb_link_node(&th->rb_node, parent, p);
531 rb_insert_color_cached(&th->rb_node, &threads->entries, leftmost);
534 * We have to initialize map_groups separately
535 * after rb tree is updated.
537 * The reason is that we call machine__findnew_thread
538 * within thread__init_map_groups to find the thread
539 * leader and that would screwed the rb tree.
541 if (thread__init_map_groups(th, machine)) {
542 rb_erase_cached(&th->rb_node, &threads->entries);
543 RB_CLEAR_NODE(&th->rb_node);
548 * It is now in the rbtree, get a ref
551 threads__set_last_match(threads, th);
558 struct thread *__machine__findnew_thread(struct machine *machine, pid_t pid, pid_t tid)
560 return ____machine__findnew_thread(machine, machine__threads(machine, tid), pid, tid, true);
563 struct thread *machine__findnew_thread(struct machine *machine, pid_t pid,
566 struct threads *threads = machine__threads(machine, tid);
569 down_write(&threads->lock);
570 th = __machine__findnew_thread(machine, pid, tid);
571 up_write(&threads->lock);
575 struct thread *machine__find_thread(struct machine *machine, pid_t pid,
578 struct threads *threads = machine__threads(machine, tid);
581 down_read(&threads->lock);
582 th = ____machine__findnew_thread(machine, threads, pid, tid, false);
583 up_read(&threads->lock);
587 struct comm *machine__thread_exec_comm(struct machine *machine,
588 struct thread *thread)
590 if (machine->comm_exec)
591 return thread__exec_comm(thread);
593 return thread__comm(thread);
596 int machine__process_comm_event(struct machine *machine, union perf_event *event,
597 struct perf_sample *sample)
599 struct thread *thread = machine__findnew_thread(machine,
602 bool exec = event->header.misc & PERF_RECORD_MISC_COMM_EXEC;
606 machine->comm_exec = true;
609 perf_event__fprintf_comm(event, stdout);
611 if (thread == NULL ||
612 __thread__set_comm(thread, event->comm.comm, sample->time, exec)) {
613 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
622 int machine__process_namespaces_event(struct machine *machine __maybe_unused,
623 union perf_event *event,
624 struct perf_sample *sample __maybe_unused)
626 struct thread *thread = machine__findnew_thread(machine,
627 event->namespaces.pid,
628 event->namespaces.tid);
631 WARN_ONCE(event->namespaces.nr_namespaces > NR_NAMESPACES,
632 "\nWARNING: kernel seems to support more namespaces than perf"
633 " tool.\nTry updating the perf tool..\n\n");
635 WARN_ONCE(event->namespaces.nr_namespaces < NR_NAMESPACES,
636 "\nWARNING: perf tool seems to support more namespaces than"
637 " the kernel.\nTry updating the kernel..\n\n");
640 perf_event__fprintf_namespaces(event, stdout);
642 if (thread == NULL ||
643 thread__set_namespaces(thread, sample->time, &event->namespaces)) {
644 dump_printf("problem processing PERF_RECORD_NAMESPACES, skipping event.\n");
653 int machine__process_lost_event(struct machine *machine __maybe_unused,
654 union perf_event *event, struct perf_sample *sample __maybe_unused)
656 dump_printf(": id:%" PRI_lu64 ": lost:%" PRI_lu64 "\n",
657 event->lost.id, event->lost.lost);
661 int machine__process_lost_samples_event(struct machine *machine __maybe_unused,
662 union perf_event *event, struct perf_sample *sample)
664 dump_printf(": id:%" PRIu64 ": lost samples :%" PRI_lu64 "\n",
665 sample->id, event->lost_samples.lost);
669 static struct dso *machine__findnew_module_dso(struct machine *machine,
671 const char *filename)
675 down_write(&machine->dsos.lock);
677 dso = __dsos__find(&machine->dsos, m->name, true);
679 dso = __dsos__addnew(&machine->dsos, m->name);
683 dso__set_module_info(dso, m, machine);
684 dso__set_long_name(dso, strdup(filename), true);
689 up_write(&machine->dsos.lock);
693 int machine__process_aux_event(struct machine *machine __maybe_unused,
694 union perf_event *event)
697 perf_event__fprintf_aux(event, stdout);
701 int machine__process_itrace_start_event(struct machine *machine __maybe_unused,
702 union perf_event *event)
705 perf_event__fprintf_itrace_start(event, stdout);
709 int machine__process_switch_event(struct machine *machine __maybe_unused,
710 union perf_event *event)
713 perf_event__fprintf_switch(event, stdout);
717 static int machine__process_ksymbol_register(struct machine *machine,
718 union perf_event *event,
719 struct perf_sample *sample __maybe_unused)
724 map = map_groups__find(&machine->kmaps, event->ksymbol.addr);
726 map = dso__new_map(event->ksymbol.name);
730 map->start = event->ksymbol.addr;
731 map->end = map->start + event->ksymbol.len;
732 map_groups__insert(&machine->kmaps, map);
735 sym = symbol__new(map->map_ip(map, map->start),
737 0, 0, event->ksymbol.name);
740 dso__insert_symbol(map->dso, sym);
744 static int machine__process_ksymbol_unregister(struct machine *machine,
745 union perf_event *event,
746 struct perf_sample *sample __maybe_unused)
750 map = map_groups__find(&machine->kmaps, event->ksymbol.addr);
752 map_groups__remove(&machine->kmaps, map);
757 int machine__process_ksymbol(struct machine *machine __maybe_unused,
758 union perf_event *event,
759 struct perf_sample *sample)
762 perf_event__fprintf_ksymbol(event, stdout);
764 if (event->ksymbol.flags & PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER)
765 return machine__process_ksymbol_unregister(machine, event,
767 return machine__process_ksymbol_register(machine, event, sample);
770 static void dso__adjust_kmod_long_name(struct dso *dso, const char *filename)
772 const char *dup_filename;
774 if (!filename || !dso || !dso->long_name)
776 if (dso->long_name[0] != '[')
778 if (!strchr(filename, '/'))
781 dup_filename = strdup(filename);
785 dso__set_long_name(dso, dup_filename, true);
788 struct map *machine__findnew_module_map(struct machine *machine, u64 start,
789 const char *filename)
791 struct map *map = NULL;
792 struct dso *dso = NULL;
795 if (kmod_path__parse_name(&m, filename))
798 map = map_groups__find_by_name(&machine->kmaps, m.name);
801 * If the map's dso is an offline module, give dso__load()
802 * a chance to find the file path of that module by fixing
805 dso__adjust_kmod_long_name(map->dso, filename);
809 dso = machine__findnew_module_dso(machine, &m, filename);
813 map = map__new2(start, dso);
817 map_groups__insert(&machine->kmaps, map);
819 /* Put the map here because map_groups__insert alread got it */
822 /* put the dso here, corresponding to machine__findnew_module_dso */
828 size_t machines__fprintf_dsos(struct machines *machines, FILE *fp)
831 size_t ret = __dsos__fprintf(&machines->host.dsos.head, fp);
833 for (nd = rb_first_cached(&machines->guests); nd; nd = rb_next(nd)) {
834 struct machine *pos = rb_entry(nd, struct machine, rb_node);
835 ret += __dsos__fprintf(&pos->dsos.head, fp);
841 size_t machine__fprintf_dsos_buildid(struct machine *m, FILE *fp,
842 bool (skip)(struct dso *dso, int parm), int parm)
844 return __dsos__fprintf_buildid(&m->dsos.head, fp, skip, parm);
847 size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp,
848 bool (skip)(struct dso *dso, int parm), int parm)
851 size_t ret = machine__fprintf_dsos_buildid(&machines->host, fp, skip, parm);
853 for (nd = rb_first_cached(&machines->guests); nd; nd = rb_next(nd)) {
854 struct machine *pos = rb_entry(nd, struct machine, rb_node);
855 ret += machine__fprintf_dsos_buildid(pos, fp, skip, parm);
860 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
864 struct dso *kdso = machine__kernel_map(machine)->dso;
866 if (kdso->has_build_id) {
867 char filename[PATH_MAX];
868 if (dso__build_id_filename(kdso, filename, sizeof(filename),
870 printed += fprintf(fp, "[0] %s\n", filename);
873 for (i = 0; i < vmlinux_path__nr_entries; ++i)
874 printed += fprintf(fp, "[%d] %s\n",
875 i + kdso->has_build_id, vmlinux_path[i]);
880 size_t machine__fprintf(struct machine *machine, FILE *fp)
886 for (i = 0; i < THREADS__TABLE_SIZE; i++) {
887 struct threads *threads = &machine->threads[i];
889 down_read(&threads->lock);
891 ret = fprintf(fp, "Threads: %u\n", threads->nr);
893 for (nd = rb_first_cached(&threads->entries); nd;
895 struct thread *pos = rb_entry(nd, struct thread, rb_node);
897 ret += thread__fprintf(pos, fp);
900 up_read(&threads->lock);
905 static struct dso *machine__get_kernel(struct machine *machine)
907 const char *vmlinux_name = machine->mmap_name;
910 if (machine__is_host(machine)) {
911 if (symbol_conf.vmlinux_name)
912 vmlinux_name = symbol_conf.vmlinux_name;
914 kernel = machine__findnew_kernel(machine, vmlinux_name,
915 "[kernel]", DSO_TYPE_KERNEL);
917 if (symbol_conf.default_guest_vmlinux_name)
918 vmlinux_name = symbol_conf.default_guest_vmlinux_name;
920 kernel = machine__findnew_kernel(machine, vmlinux_name,
922 DSO_TYPE_GUEST_KERNEL);
925 if (kernel != NULL && (!kernel->has_build_id))
926 dso__read_running_kernel_build_id(kernel, machine);
931 struct process_args {
935 void machine__get_kallsyms_filename(struct machine *machine, char *buf,
938 if (machine__is_default_guest(machine))
939 scnprintf(buf, bufsz, "%s", symbol_conf.default_guest_kallsyms);
941 scnprintf(buf, bufsz, "%s/proc/kallsyms", machine->root_dir);
944 const char *ref_reloc_sym_names[] = {"_text", "_stext", NULL};
946 /* Figure out the start address of kernel map from /proc/kallsyms.
947 * Returns the name of the start symbol in *symbol_name. Pass in NULL as
948 * symbol_name if it's not that important.
950 static int machine__get_running_kernel_start(struct machine *machine,
951 const char **symbol_name,
952 u64 *start, u64 *end)
954 char filename[PATH_MAX];
959 machine__get_kallsyms_filename(machine, filename, PATH_MAX);
961 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
964 for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) {
965 err = kallsyms__get_function_start(filename, name, &addr);
978 err = kallsyms__get_function_start(filename, "_etext", &addr);
985 int machine__create_extra_kernel_map(struct machine *machine,
987 struct extra_kernel_map *xm)
992 map = map__new2(xm->start, kernel);
997 map->pgoff = xm->pgoff;
999 kmap = map__kmap(map);
1001 kmap->kmaps = &machine->kmaps;
1002 strlcpy(kmap->name, xm->name, KMAP_NAME_LEN);
1004 map_groups__insert(&machine->kmaps, map);
1006 pr_debug2("Added extra kernel map %s %" PRIx64 "-%" PRIx64 "\n",
1007 kmap->name, map->start, map->end);
1014 static u64 find_entry_trampoline(struct dso *dso)
1016 /* Duplicates are removed so lookup all aliases */
1017 const char *syms[] = {
1018 "_entry_trampoline",
1019 "__entry_trampoline_start",
1020 "entry_SYSCALL_64_trampoline",
1022 struct symbol *sym = dso__first_symbol(dso);
1025 for (; sym; sym = dso__next_symbol(sym)) {
1026 if (sym->binding != STB_GLOBAL)
1028 for (i = 0; i < ARRAY_SIZE(syms); i++) {
1029 if (!strcmp(sym->name, syms[i]))
1038 * These values can be used for kernels that do not have symbols for the entry
1039 * trampolines in kallsyms.
1041 #define X86_64_CPU_ENTRY_AREA_PER_CPU 0xfffffe0000000000ULL
1042 #define X86_64_CPU_ENTRY_AREA_SIZE 0x2c000
1043 #define X86_64_ENTRY_TRAMPOLINE 0x6000
1045 /* Map x86_64 PTI entry trampolines */
1046 int machine__map_x86_64_entry_trampolines(struct machine *machine,
1049 struct map_groups *kmaps = &machine->kmaps;
1050 struct maps *maps = &kmaps->maps;
1051 int nr_cpus_avail, cpu;
1057 * In the vmlinux case, pgoff is a virtual address which must now be
1058 * mapped to a vmlinux offset.
1060 for (map = maps__first(maps); map; map = map__next(map)) {
1061 struct kmap *kmap = __map__kmap(map);
1062 struct map *dest_map;
1064 if (!kmap || !is_entry_trampoline(kmap->name))
1067 dest_map = map_groups__find(kmaps, map->pgoff);
1068 if (dest_map != map)
1069 map->pgoff = dest_map->map_ip(dest_map, map->pgoff);
1072 if (found || machine->trampolines_mapped)
1075 pgoff = find_entry_trampoline(kernel);
1079 nr_cpus_avail = machine__nr_cpus_avail(machine);
1081 /* Add a 1 page map for each CPU's entry trampoline */
1082 for (cpu = 0; cpu < nr_cpus_avail; cpu++) {
1083 u64 va = X86_64_CPU_ENTRY_AREA_PER_CPU +
1084 cpu * X86_64_CPU_ENTRY_AREA_SIZE +
1085 X86_64_ENTRY_TRAMPOLINE;
1086 struct extra_kernel_map xm = {
1088 .end = va + page_size,
1092 strlcpy(xm.name, ENTRY_TRAMPOLINE_NAME, KMAP_NAME_LEN);
1094 if (machine__create_extra_kernel_map(machine, kernel, &xm) < 0)
1098 machine->trampolines_mapped = nr_cpus_avail;
1103 int __weak machine__create_extra_kernel_maps(struct machine *machine __maybe_unused,
1104 struct dso *kernel __maybe_unused)
1110 __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
1115 /* In case of renewal the kernel map, destroy previous one */
1116 machine__destroy_kernel_maps(machine);
1118 machine->vmlinux_map = map__new2(0, kernel);
1119 if (machine->vmlinux_map == NULL)
1122 machine->vmlinux_map->map_ip = machine->vmlinux_map->unmap_ip = identity__map_ip;
1123 map = machine__kernel_map(machine);
1124 kmap = map__kmap(map);
1128 kmap->kmaps = &machine->kmaps;
1129 map_groups__insert(&machine->kmaps, map);
1134 void machine__destroy_kernel_maps(struct machine *machine)
1137 struct map *map = machine__kernel_map(machine);
1142 kmap = map__kmap(map);
1143 map_groups__remove(&machine->kmaps, map);
1144 if (kmap && kmap->ref_reloc_sym) {
1145 zfree((char **)&kmap->ref_reloc_sym->name);
1146 zfree(&kmap->ref_reloc_sym);
1149 map__zput(machine->vmlinux_map);
1152 int machines__create_guest_kernel_maps(struct machines *machines)
1155 struct dirent **namelist = NULL;
1157 char path[PATH_MAX];
1161 if (symbol_conf.default_guest_vmlinux_name ||
1162 symbol_conf.default_guest_modules ||
1163 symbol_conf.default_guest_kallsyms) {
1164 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
1167 if (symbol_conf.guestmount) {
1168 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
1171 for (i = 0; i < items; i++) {
1172 if (!isdigit(namelist[i]->d_name[0])) {
1173 /* Filter out . and .. */
1176 pid = (pid_t)strtol(namelist[i]->d_name, &endp, 10);
1177 if ((*endp != '\0') ||
1178 (endp == namelist[i]->d_name) ||
1179 (errno == ERANGE)) {
1180 pr_debug("invalid directory (%s). Skipping.\n",
1181 namelist[i]->d_name);
1184 sprintf(path, "%s/%s/proc/kallsyms",
1185 symbol_conf.guestmount,
1186 namelist[i]->d_name);
1187 ret = access(path, R_OK);
1189 pr_debug("Can't access file %s\n", path);
1192 machines__create_kernel_maps(machines, pid);
1201 void machines__destroy_kernel_maps(struct machines *machines)
1203 struct rb_node *next = rb_first_cached(&machines->guests);
1205 machine__destroy_kernel_maps(&machines->host);
1208 struct machine *pos = rb_entry(next, struct machine, rb_node);
1210 next = rb_next(&pos->rb_node);
1211 rb_erase_cached(&pos->rb_node, &machines->guests);
1212 machine__delete(pos);
1216 int machines__create_kernel_maps(struct machines *machines, pid_t pid)
1218 struct machine *machine = machines__findnew(machines, pid);
1220 if (machine == NULL)
1223 return machine__create_kernel_maps(machine);
1226 int machine__load_kallsyms(struct machine *machine, const char *filename)
1228 struct map *map = machine__kernel_map(machine);
1229 int ret = __dso__load_kallsyms(map->dso, filename, map, true);
1232 dso__set_loaded(map->dso);
1234 * Since /proc/kallsyms will have multiple sessions for the
1235 * kernel, with modules between them, fixup the end of all
1238 map_groups__fixup_end(&machine->kmaps);
1244 int machine__load_vmlinux_path(struct machine *machine)
1246 struct map *map = machine__kernel_map(machine);
1247 int ret = dso__load_vmlinux_path(map->dso, map);
1250 dso__set_loaded(map->dso);
1255 static char *get_kernel_version(const char *root_dir)
1257 char version[PATH_MAX];
1260 const char *prefix = "Linux version ";
1262 sprintf(version, "%s/proc/version", root_dir);
1263 file = fopen(version, "r");
1267 tmp = fgets(version, sizeof(version), file);
1272 name = strstr(version, prefix);
1275 name += strlen(prefix);
1276 tmp = strchr(name, ' ');
1280 return strdup(name);
1283 static bool is_kmod_dso(struct dso *dso)
1285 return dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1286 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE;
1289 static int map_groups__set_module_path(struct map_groups *mg, const char *path,
1290 struct kmod_path *m)
1293 struct map *map = map_groups__find_by_name(mg, m->name);
1298 long_name = strdup(path);
1299 if (long_name == NULL)
1302 dso__set_long_name(map->dso, long_name, true);
1303 dso__kernel_module_get_build_id(map->dso, "");
1306 * Full name could reveal us kmod compression, so
1307 * we need to update the symtab_type if needed.
1309 if (m->comp && is_kmod_dso(map->dso)) {
1310 map->dso->symtab_type++;
1311 map->dso->comp = m->comp;
1317 static int map_groups__set_modules_path_dir(struct map_groups *mg,
1318 const char *dir_name, int depth)
1320 struct dirent *dent;
1321 DIR *dir = opendir(dir_name);
1325 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1329 while ((dent = readdir(dir)) != NULL) {
1330 char path[PATH_MAX];
1333 /*sshfs might return bad dent->d_type, so we have to stat*/
1334 snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name);
1335 if (stat(path, &st))
1338 if (S_ISDIR(st.st_mode)) {
1339 if (!strcmp(dent->d_name, ".") ||
1340 !strcmp(dent->d_name, ".."))
1343 /* Do not follow top-level source and build symlinks */
1345 if (!strcmp(dent->d_name, "source") ||
1346 !strcmp(dent->d_name, "build"))
1350 ret = map_groups__set_modules_path_dir(mg, path,
1357 ret = kmod_path__parse_name(&m, dent->d_name);
1362 ret = map_groups__set_module_path(mg, path, &m);
1376 static int machine__set_modules_path(struct machine *machine)
1379 char modules_path[PATH_MAX];
1381 version = get_kernel_version(machine->root_dir);
1385 snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s",
1386 machine->root_dir, version);
1389 return map_groups__set_modules_path_dir(&machine->kmaps, modules_path, 0);
1391 int __weak arch__fix_module_text_start(u64 *start __maybe_unused,
1392 u64 *size __maybe_unused,
1393 const char *name __maybe_unused)
1398 static int machine__create_module(void *arg, const char *name, u64 start,
1401 struct machine *machine = arg;
1404 if (arch__fix_module_text_start(&start, &size, name) < 0)
1407 map = machine__findnew_module_map(machine, start, name);
1410 map->end = start + size;
1412 dso__kernel_module_get_build_id(map->dso, machine->root_dir);
1417 static int machine__create_modules(struct machine *machine)
1419 const char *modules;
1420 char path[PATH_MAX];
1422 if (machine__is_default_guest(machine)) {
1423 modules = symbol_conf.default_guest_modules;
1425 snprintf(path, PATH_MAX, "%s/proc/modules", machine->root_dir);
1429 if (symbol__restricted_filename(modules, "/proc/modules"))
1432 if (modules__parse(modules, machine, machine__create_module))
1435 if (!machine__set_modules_path(machine))
1438 pr_debug("Problems setting modules path maps, continuing anyway...\n");
1443 static void machine__set_kernel_mmap(struct machine *machine,
1446 machine->vmlinux_map->start = start;
1447 machine->vmlinux_map->end = end;
1449 * Be a bit paranoid here, some perf.data file came with
1450 * a zero sized synthesized MMAP event for the kernel.
1452 if (start == 0 && end == 0)
1453 machine->vmlinux_map->end = ~0ULL;
1456 static void machine__update_kernel_mmap(struct machine *machine,
1459 struct map *map = machine__kernel_map(machine);
1462 map_groups__remove(&machine->kmaps, map);
1464 machine__set_kernel_mmap(machine, start, end);
1466 map_groups__insert(&machine->kmaps, map);
1470 int machine__create_kernel_maps(struct machine *machine)
1472 struct dso *kernel = machine__get_kernel(machine);
1473 const char *name = NULL;
1475 u64 start = 0, end = ~0ULL;
1481 ret = __machine__create_kernel_maps(machine, kernel);
1485 if (symbol_conf.use_modules && machine__create_modules(machine) < 0) {
1486 if (machine__is_host(machine))
1487 pr_debug("Problems creating module maps, "
1488 "continuing anyway...\n");
1490 pr_debug("Problems creating module maps for guest %d, "
1491 "continuing anyway...\n", machine->pid);
1494 if (!machine__get_running_kernel_start(machine, &name, &start, &end)) {
1496 map__set_kallsyms_ref_reloc_sym(machine->vmlinux_map, name, start)) {
1497 machine__destroy_kernel_maps(machine);
1503 * we have a real start address now, so re-order the kmaps
1504 * assume it's the last in the kmaps
1506 machine__update_kernel_mmap(machine, start, end);
1509 if (machine__create_extra_kernel_maps(machine, kernel))
1510 pr_debug("Problems creating extra kernel maps, continuing anyway...\n");
1513 /* update end address of the kernel map using adjacent module address */
1514 map = map__next(machine__kernel_map(machine));
1516 machine__set_kernel_mmap(machine, start, map->start);
1524 static bool machine__uses_kcore(struct machine *machine)
1528 list_for_each_entry(dso, &machine->dsos.head, node) {
1529 if (dso__is_kcore(dso))
1536 static bool perf_event__is_extra_kernel_mmap(struct machine *machine,
1537 union perf_event *event)
1539 return machine__is(machine, "x86_64") &&
1540 is_entry_trampoline(event->mmap.filename);
1543 static int machine__process_extra_kernel_map(struct machine *machine,
1544 union perf_event *event)
1546 struct map *kernel_map = machine__kernel_map(machine);
1547 struct dso *kernel = kernel_map ? kernel_map->dso : NULL;
1548 struct extra_kernel_map xm = {
1549 .start = event->mmap.start,
1550 .end = event->mmap.start + event->mmap.len,
1551 .pgoff = event->mmap.pgoff,
1557 strlcpy(xm.name, event->mmap.filename, KMAP_NAME_LEN);
1559 return machine__create_extra_kernel_map(machine, kernel, &xm);
1562 static int machine__process_kernel_mmap_event(struct machine *machine,
1563 union perf_event *event)
1566 enum dso_kernel_type kernel_type;
1567 bool is_kernel_mmap;
1569 /* If we have maps from kcore then we do not need or want any others */
1570 if (machine__uses_kcore(machine))
1573 if (machine__is_host(machine))
1574 kernel_type = DSO_TYPE_KERNEL;
1576 kernel_type = DSO_TYPE_GUEST_KERNEL;
1578 is_kernel_mmap = memcmp(event->mmap.filename,
1580 strlen(machine->mmap_name) - 1) == 0;
1581 if (event->mmap.filename[0] == '/' ||
1582 (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
1583 map = machine__findnew_module_map(machine, event->mmap.start,
1584 event->mmap.filename);
1588 map->end = map->start + event->mmap.len;
1589 } else if (is_kernel_mmap) {
1590 const char *symbol_name = (event->mmap.filename +
1591 strlen(machine->mmap_name));
1593 * Should be there already, from the build-id table in
1596 struct dso *kernel = NULL;
1599 down_read(&machine->dsos.lock);
1601 list_for_each_entry(dso, &machine->dsos.head, node) {
1604 * The cpumode passed to is_kernel_module is not the
1605 * cpumode of *this* event. If we insist on passing
1606 * correct cpumode to is_kernel_module, we should
1607 * record the cpumode when we adding this dso to the
1610 * However we don't really need passing correct
1611 * cpumode. We know the correct cpumode must be kernel
1612 * mode (if not, we should not link it onto kernel_dsos
1615 * Therefore, we pass PERF_RECORD_MISC_CPUMODE_UNKNOWN.
1616 * is_kernel_module() treats it as a kernel cpumode.
1620 is_kernel_module(dso->long_name,
1621 PERF_RECORD_MISC_CPUMODE_UNKNOWN))
1629 up_read(&machine->dsos.lock);
1632 kernel = machine__findnew_dso(machine, machine->mmap_name);
1636 kernel->kernel = kernel_type;
1637 if (__machine__create_kernel_maps(machine, kernel) < 0) {
1642 if (strstr(kernel->long_name, "vmlinux"))
1643 dso__set_short_name(kernel, "[kernel.vmlinux]", false);
1645 machine__update_kernel_mmap(machine, event->mmap.start,
1646 event->mmap.start + event->mmap.len);
1649 * Avoid using a zero address (kptr_restrict) for the ref reloc
1650 * symbol. Effectively having zero here means that at record
1651 * time /proc/sys/kernel/kptr_restrict was non zero.
1653 if (event->mmap.pgoff != 0) {
1654 map__set_kallsyms_ref_reloc_sym(machine->vmlinux_map,
1659 if (machine__is_default_guest(machine)) {
1661 * preload dso of guest kernel and modules
1663 dso__load(kernel, machine__kernel_map(machine));
1665 } else if (perf_event__is_extra_kernel_mmap(machine, event)) {
1666 return machine__process_extra_kernel_map(machine, event);
1673 int machine__process_mmap2_event(struct machine *machine,
1674 union perf_event *event,
1675 struct perf_sample *sample)
1677 struct thread *thread;
1682 perf_event__fprintf_mmap2(event, stdout);
1684 if (sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1685 sample->cpumode == PERF_RECORD_MISC_KERNEL) {
1686 ret = machine__process_kernel_mmap_event(machine, event);
1692 thread = machine__findnew_thread(machine, event->mmap2.pid,
1697 map = map__new(machine, event->mmap2.start,
1698 event->mmap2.len, event->mmap2.pgoff,
1700 event->mmap2.min, event->mmap2.ino,
1701 event->mmap2.ino_generation,
1704 event->mmap2.filename, thread);
1707 goto out_problem_map;
1709 ret = thread__insert_map(thread, map);
1711 goto out_problem_insert;
1713 thread__put(thread);
1720 thread__put(thread);
1722 dump_printf("problem processing PERF_RECORD_MMAP2, skipping event.\n");
1726 int machine__process_mmap_event(struct machine *machine, union perf_event *event,
1727 struct perf_sample *sample)
1729 struct thread *thread;
1735 perf_event__fprintf_mmap(event, stdout);
1737 if (sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1738 sample->cpumode == PERF_RECORD_MISC_KERNEL) {
1739 ret = machine__process_kernel_mmap_event(machine, event);
1745 thread = machine__findnew_thread(machine, event->mmap.pid,
1750 if (!(event->header.misc & PERF_RECORD_MISC_MMAP_DATA))
1753 map = map__new(machine, event->mmap.start,
1754 event->mmap.len, event->mmap.pgoff,
1755 0, 0, 0, 0, prot, 0,
1756 event->mmap.filename,
1760 goto out_problem_map;
1762 ret = thread__insert_map(thread, map);
1764 goto out_problem_insert;
1766 thread__put(thread);
1773 thread__put(thread);
1775 dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
1779 static void __machine__remove_thread(struct machine *machine, struct thread *th, bool lock)
1781 struct threads *threads = machine__threads(machine, th->tid);
1783 if (threads->last_match == th)
1784 threads__set_last_match(threads, NULL);
1787 down_write(&threads->lock);
1789 BUG_ON(refcount_read(&th->refcnt) == 0);
1791 rb_erase_cached(&th->rb_node, &threads->entries);
1792 RB_CLEAR_NODE(&th->rb_node);
1795 * Move it first to the dead_threads list, then drop the reference,
1796 * if this is the last reference, then the thread__delete destructor
1797 * will be called and we will remove it from the dead_threads list.
1799 list_add_tail(&th->node, &threads->dead);
1802 * We need to do the put here because if this is the last refcount,
1803 * then we will be touching the threads->dead head when removing the
1809 up_write(&threads->lock);
1812 void machine__remove_thread(struct machine *machine, struct thread *th)
1814 return __machine__remove_thread(machine, th, true);
1817 int machine__process_fork_event(struct machine *machine, union perf_event *event,
1818 struct perf_sample *sample)
1820 struct thread *thread = machine__find_thread(machine,
1823 struct thread *parent = machine__findnew_thread(machine,
1826 bool do_maps_clone = true;
1830 perf_event__fprintf_task(event, stdout);
1833 * There may be an existing thread that is not actually the parent,
1834 * either because we are processing events out of order, or because the
1835 * (fork) event that would have removed the thread was lost. Assume the
1836 * latter case and continue on as best we can.
1838 if (parent->pid_ != (pid_t)event->fork.ppid) {
1839 dump_printf("removing erroneous parent thread %d/%d\n",
1840 parent->pid_, parent->tid);
1841 machine__remove_thread(machine, parent);
1842 thread__put(parent);
1843 parent = machine__findnew_thread(machine, event->fork.ppid,
1847 /* if a thread currently exists for the thread id remove it */
1848 if (thread != NULL) {
1849 machine__remove_thread(machine, thread);
1850 thread__put(thread);
1853 thread = machine__findnew_thread(machine, event->fork.pid,
1856 * When synthesizing FORK events, we are trying to create thread
1857 * objects for the already running tasks on the machine.
1859 * Normally, for a kernel FORK event, we want to clone the parent's
1860 * maps because that is what the kernel just did.
1862 * But when synthesizing, this should not be done. If we do, we end up
1863 * with overlapping maps as we process the sythesized MMAP2 events that
1864 * get delivered shortly thereafter.
1866 * Use the FORK event misc flags in an internal way to signal this
1867 * situation, so we can elide the map clone when appropriate.
1869 if (event->fork.header.misc & PERF_RECORD_MISC_FORK_EXEC)
1870 do_maps_clone = false;
1872 if (thread == NULL || parent == NULL ||
1873 thread__fork(thread, parent, sample->time, do_maps_clone) < 0) {
1874 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
1877 thread__put(thread);
1878 thread__put(parent);
1883 int machine__process_exit_event(struct machine *machine, union perf_event *event,
1884 struct perf_sample *sample __maybe_unused)
1886 struct thread *thread = machine__find_thread(machine,
1891 perf_event__fprintf_task(event, stdout);
1893 if (thread != NULL) {
1894 thread__exited(thread);
1895 thread__put(thread);
1901 int machine__process_event(struct machine *machine, union perf_event *event,
1902 struct perf_sample *sample)
1906 switch (event->header.type) {
1907 case PERF_RECORD_COMM:
1908 ret = machine__process_comm_event(machine, event, sample); break;
1909 case PERF_RECORD_MMAP:
1910 ret = machine__process_mmap_event(machine, event, sample); break;
1911 case PERF_RECORD_NAMESPACES:
1912 ret = machine__process_namespaces_event(machine, event, sample); break;
1913 case PERF_RECORD_MMAP2:
1914 ret = machine__process_mmap2_event(machine, event, sample); break;
1915 case PERF_RECORD_FORK:
1916 ret = machine__process_fork_event(machine, event, sample); break;
1917 case PERF_RECORD_EXIT:
1918 ret = machine__process_exit_event(machine, event, sample); break;
1919 case PERF_RECORD_LOST:
1920 ret = machine__process_lost_event(machine, event, sample); break;
1921 case PERF_RECORD_AUX:
1922 ret = machine__process_aux_event(machine, event); break;
1923 case PERF_RECORD_ITRACE_START:
1924 ret = machine__process_itrace_start_event(machine, event); break;
1925 case PERF_RECORD_LOST_SAMPLES:
1926 ret = machine__process_lost_samples_event(machine, event, sample); break;
1927 case PERF_RECORD_SWITCH:
1928 case PERF_RECORD_SWITCH_CPU_WIDE:
1929 ret = machine__process_switch_event(machine, event); break;
1930 case PERF_RECORD_KSYMBOL:
1931 ret = machine__process_ksymbol(machine, event, sample); break;
1932 case PERF_RECORD_BPF_EVENT:
1933 ret = machine__process_bpf(machine, event, sample); break;
1942 static bool symbol__match_regex(struct symbol *sym, regex_t *regex)
1944 if (!regexec(regex, sym->name, 0, NULL, 0))
1949 static void ip__resolve_ams(struct thread *thread,
1950 struct addr_map_symbol *ams,
1953 struct addr_location al;
1955 memset(&al, 0, sizeof(al));
1957 * We cannot use the header.misc hint to determine whether a
1958 * branch stack address is user, kernel, guest, hypervisor.
1959 * Branches may straddle the kernel/user/hypervisor boundaries.
1960 * Thus, we have to try consecutively until we find a match
1961 * or else, the symbol is unknown
1963 thread__find_cpumode_addr_location(thread, ip, &al);
1966 ams->al_addr = al.addr;
1972 static void ip__resolve_data(struct thread *thread,
1973 u8 m, struct addr_map_symbol *ams,
1974 u64 addr, u64 phys_addr)
1976 struct addr_location al;
1978 memset(&al, 0, sizeof(al));
1980 thread__find_symbol(thread, m, addr, &al);
1983 ams->al_addr = al.addr;
1986 ams->phys_addr = phys_addr;
1989 struct mem_info *sample__resolve_mem(struct perf_sample *sample,
1990 struct addr_location *al)
1992 struct mem_info *mi = mem_info__new();
1997 ip__resolve_ams(al->thread, &mi->iaddr, sample->ip);
1998 ip__resolve_data(al->thread, al->cpumode, &mi->daddr,
1999 sample->addr, sample->phys_addr);
2000 mi->data_src.val = sample->data_src;
2005 static char *callchain_srcline(struct map *map, struct symbol *sym, u64 ip)
2007 char *srcline = NULL;
2009 if (!map || callchain_param.key == CCKEY_FUNCTION)
2012 srcline = srcline__tree_find(&map->dso->srclines, ip);
2014 bool show_sym = false;
2015 bool show_addr = callchain_param.key == CCKEY_ADDRESS;
2017 srcline = get_srcline(map->dso, map__rip_2objdump(map, ip),
2018 sym, show_sym, show_addr, ip);
2019 srcline__tree_insert(&map->dso->srclines, ip, srcline);
2030 static int add_callchain_ip(struct thread *thread,
2031 struct callchain_cursor *cursor,
2032 struct symbol **parent,
2033 struct addr_location *root_al,
2037 struct branch_flags *flags,
2038 struct iterations *iter,
2041 struct addr_location al;
2042 int nr_loop_iter = 0;
2043 u64 iter_cycles = 0;
2044 const char *srcline = NULL;
2049 thread__find_cpumode_addr_location(thread, ip, &al);
2051 if (ip >= PERF_CONTEXT_MAX) {
2053 case PERF_CONTEXT_HV:
2054 *cpumode = PERF_RECORD_MISC_HYPERVISOR;
2056 case PERF_CONTEXT_KERNEL:
2057 *cpumode = PERF_RECORD_MISC_KERNEL;
2059 case PERF_CONTEXT_USER:
2060 *cpumode = PERF_RECORD_MISC_USER;
2063 pr_debug("invalid callchain context: "
2064 "%"PRId64"\n", (s64) ip);
2066 * It seems the callchain is corrupted.
2069 callchain_cursor_reset(cursor);
2074 thread__find_symbol(thread, *cpumode, ip, &al);
2077 if (al.sym != NULL) {
2078 if (perf_hpp_list.parent && !*parent &&
2079 symbol__match_regex(al.sym, &parent_regex))
2081 else if (have_ignore_callees && root_al &&
2082 symbol__match_regex(al.sym, &ignore_callees_regex)) {
2083 /* Treat this symbol as the root,
2084 forgetting its callees. */
2086 callchain_cursor_reset(cursor);
2090 if (symbol_conf.hide_unresolved && al.sym == NULL)
2094 nr_loop_iter = iter->nr_loop_iter;
2095 iter_cycles = iter->cycles;
2098 srcline = callchain_srcline(al.map, al.sym, al.addr);
2099 return callchain_cursor_append(cursor, ip, al.map, al.sym,
2100 branch, flags, nr_loop_iter,
2101 iter_cycles, branch_from, srcline);
2104 struct branch_info *sample__resolve_bstack(struct perf_sample *sample,
2105 struct addr_location *al)
2108 const struct branch_stack *bs = sample->branch_stack;
2109 struct branch_info *bi = calloc(bs->nr, sizeof(struct branch_info));
2114 for (i = 0; i < bs->nr; i++) {
2115 ip__resolve_ams(al->thread, &bi[i].to, bs->entries[i].to);
2116 ip__resolve_ams(al->thread, &bi[i].from, bs->entries[i].from);
2117 bi[i].flags = bs->entries[i].flags;
2122 static void save_iterations(struct iterations *iter,
2123 struct branch_entry *be, int nr)
2127 iter->nr_loop_iter++;
2130 for (i = 0; i < nr; i++)
2131 iter->cycles += be[i].flags.cycles;
2136 #define NO_ENTRY 0xff
2138 #define PERF_MAX_BRANCH_DEPTH 127
2141 static int remove_loops(struct branch_entry *l, int nr,
2142 struct iterations *iter)
2145 unsigned char chash[CHASHSZ];
2147 memset(chash, NO_ENTRY, sizeof(chash));
2149 BUG_ON(PERF_MAX_BRANCH_DEPTH > 255);
2151 for (i = 0; i < nr; i++) {
2152 int h = hash_64(l[i].from, CHASHBITS) % CHASHSZ;
2154 /* no collision handling for now */
2155 if (chash[h] == NO_ENTRY) {
2157 } else if (l[chash[h]].from == l[i].from) {
2158 bool is_loop = true;
2159 /* check if it is a real loop */
2161 for (j = chash[h]; j < i && i + off < nr; j++, off++)
2162 if (l[j].from != l[i + off].from) {
2169 save_iterations(iter + i + off,
2172 memmove(iter + i, iter + i + off,
2175 memmove(l + i, l + i + off,
2187 * Recolve LBR callstack chain sample
2189 * 1 on success get LBR callchain information
2190 * 0 no available LBR callchain information, should try fp
2191 * negative error code on other errors.
2193 static int resolve_lbr_callchain_sample(struct thread *thread,
2194 struct callchain_cursor *cursor,
2195 struct perf_sample *sample,
2196 struct symbol **parent,
2197 struct addr_location *root_al,
2200 struct ip_callchain *chain = sample->callchain;
2201 int chain_nr = min(max_stack, (int)chain->nr), i;
2202 u8 cpumode = PERF_RECORD_MISC_USER;
2203 u64 ip, branch_from = 0;
2205 for (i = 0; i < chain_nr; i++) {
2206 if (chain->ips[i] == PERF_CONTEXT_USER)
2210 /* LBR only affects the user callchain */
2211 if (i != chain_nr) {
2212 struct branch_stack *lbr_stack = sample->branch_stack;
2213 int lbr_nr = lbr_stack->nr, j, k;
2215 struct branch_flags *flags;
2217 * LBR callstack can only get user call chain.
2218 * The mix_chain_nr is kernel call chain
2219 * number plus LBR user call chain number.
2220 * i is kernel call chain number,
2221 * 1 is PERF_CONTEXT_USER,
2222 * lbr_nr + 1 is the user call chain number.
2223 * For details, please refer to the comments
2224 * in callchain__printf
2226 int mix_chain_nr = i + 1 + lbr_nr + 1;
2228 for (j = 0; j < mix_chain_nr; j++) {
2233 if (callchain_param.order == ORDER_CALLEE) {
2236 else if (j > i + 1) {
2238 ip = lbr_stack->entries[k].from;
2240 flags = &lbr_stack->entries[k].flags;
2242 ip = lbr_stack->entries[0].to;
2244 flags = &lbr_stack->entries[0].flags;
2246 lbr_stack->entries[0].from;
2251 ip = lbr_stack->entries[k].from;
2253 flags = &lbr_stack->entries[k].flags;
2255 else if (j > lbr_nr)
2256 ip = chain->ips[i + 1 - (j - lbr_nr)];
2258 ip = lbr_stack->entries[0].to;
2260 flags = &lbr_stack->entries[0].flags;
2262 lbr_stack->entries[0].from;
2266 err = add_callchain_ip(thread, cursor, parent,
2267 root_al, &cpumode, ip,
2268 branch, flags, NULL,
2271 return (err < 0) ? err : 0;
2279 static int find_prev_cpumode(struct ip_callchain *chain, struct thread *thread,
2280 struct callchain_cursor *cursor,
2281 struct symbol **parent,
2282 struct addr_location *root_al,
2283 u8 *cpumode, int ent)
2287 while (--ent >= 0) {
2288 u64 ip = chain->ips[ent];
2290 if (ip >= PERF_CONTEXT_MAX) {
2291 err = add_callchain_ip(thread, cursor, parent,
2292 root_al, cpumode, ip,
2293 false, NULL, NULL, 0);
2300 static int thread__resolve_callchain_sample(struct thread *thread,
2301 struct callchain_cursor *cursor,
2302 struct evsel *evsel,
2303 struct perf_sample *sample,
2304 struct symbol **parent,
2305 struct addr_location *root_al,
2308 struct branch_stack *branch = sample->branch_stack;
2309 struct ip_callchain *chain = sample->callchain;
2311 u8 cpumode = PERF_RECORD_MISC_USER;
2312 int i, j, err, nr_entries;
2317 chain_nr = chain->nr;
2319 if (perf_evsel__has_branch_callstack(evsel)) {
2320 err = resolve_lbr_callchain_sample(thread, cursor, sample, parent,
2321 root_al, max_stack);
2323 return (err < 0) ? err : 0;
2327 * Based on DWARF debug information, some architectures skip
2328 * a callchain entry saved by the kernel.
2330 skip_idx = arch_skip_callchain_idx(thread, chain);
2333 * Add branches to call stack for easier browsing. This gives
2334 * more context for a sample than just the callers.
2336 * This uses individual histograms of paths compared to the
2337 * aggregated histograms the normal LBR mode uses.
2339 * Limitations for now:
2340 * - No extra filters
2341 * - No annotations (should annotate somehow)
2344 if (branch && callchain_param.branch_callstack) {
2345 int nr = min(max_stack, (int)branch->nr);
2346 struct branch_entry be[nr];
2347 struct iterations iter[nr];
2349 if (branch->nr > PERF_MAX_BRANCH_DEPTH) {
2350 pr_warning("corrupted branch chain. skipping...\n");
2354 for (i = 0; i < nr; i++) {
2355 if (callchain_param.order == ORDER_CALLEE) {
2356 be[i] = branch->entries[i];
2362 * Check for overlap into the callchain.
2363 * The return address is one off compared to
2364 * the branch entry. To adjust for this
2365 * assume the calling instruction is not longer
2368 if (i == skip_idx ||
2369 chain->ips[first_call] >= PERF_CONTEXT_MAX)
2371 else if (be[i].from < chain->ips[first_call] &&
2372 be[i].from >= chain->ips[first_call] - 8)
2375 be[i] = branch->entries[branch->nr - i - 1];
2378 memset(iter, 0, sizeof(struct iterations) * nr);
2379 nr = remove_loops(be, nr, iter);
2381 for (i = 0; i < nr; i++) {
2382 err = add_callchain_ip(thread, cursor, parent,
2389 err = add_callchain_ip(thread, cursor, parent, root_al,
2406 if (callchain_param.order != ORDER_CALLEE) {
2407 err = find_prev_cpumode(chain, thread, cursor, parent, root_al,
2408 &cpumode, chain->nr - first_call);
2410 return (err < 0) ? err : 0;
2412 for (i = first_call, nr_entries = 0;
2413 i < chain_nr && nr_entries < max_stack; i++) {
2416 if (callchain_param.order == ORDER_CALLEE)
2419 j = chain->nr - i - 1;
2421 #ifdef HAVE_SKIP_CALLCHAIN_IDX
2426 if (ip < PERF_CONTEXT_MAX)
2428 else if (callchain_param.order != ORDER_CALLEE) {
2429 err = find_prev_cpumode(chain, thread, cursor, parent,
2430 root_al, &cpumode, j);
2432 return (err < 0) ? err : 0;
2436 err = add_callchain_ip(thread, cursor, parent,
2437 root_al, &cpumode, ip,
2438 false, NULL, NULL, 0);
2441 return (err < 0) ? err : 0;
2447 static int append_inlines(struct callchain_cursor *cursor,
2448 struct map *map, struct symbol *sym, u64 ip)
2450 struct inline_node *inline_node;
2451 struct inline_list *ilist;
2455 if (!symbol_conf.inline_name || !map || !sym)
2458 addr = map__map_ip(map, ip);
2459 addr = map__rip_2objdump(map, addr);
2461 inline_node = inlines__tree_find(&map->dso->inlined_nodes, addr);
2463 inline_node = dso__parse_addr_inlines(map->dso, addr, sym);
2466 inlines__tree_insert(&map->dso->inlined_nodes, inline_node);
2469 list_for_each_entry(ilist, &inline_node->val, list) {
2470 ret = callchain_cursor_append(cursor, ip, map,
2471 ilist->symbol, false,
2472 NULL, 0, 0, 0, ilist->srcline);
2481 static int unwind_entry(struct unwind_entry *entry, void *arg)
2483 struct callchain_cursor *cursor = arg;
2484 const char *srcline = NULL;
2485 u64 addr = entry->ip;
2487 if (symbol_conf.hide_unresolved && entry->sym == NULL)
2490 if (append_inlines(cursor, entry->map, entry->sym, entry->ip) == 0)
2494 * Convert entry->ip from a virtual address to an offset in
2495 * its corresponding binary.
2498 addr = map__map_ip(entry->map, entry->ip);
2500 srcline = callchain_srcline(entry->map, entry->sym, addr);
2501 return callchain_cursor_append(cursor, entry->ip,
2502 entry->map, entry->sym,
2503 false, NULL, 0, 0, 0, srcline);
2506 static int thread__resolve_callchain_unwind(struct thread *thread,
2507 struct callchain_cursor *cursor,
2508 struct evsel *evsel,
2509 struct perf_sample *sample,
2512 /* Can we do dwarf post unwind? */
2513 if (!((evsel->core.attr.sample_type & PERF_SAMPLE_REGS_USER) &&
2514 (evsel->core.attr.sample_type & PERF_SAMPLE_STACK_USER)))
2517 /* Bail out if nothing was captured. */
2518 if ((!sample->user_regs.regs) ||
2519 (!sample->user_stack.size))
2522 return unwind__get_entries(unwind_entry, cursor,
2523 thread, sample, max_stack);
2526 int thread__resolve_callchain(struct thread *thread,
2527 struct callchain_cursor *cursor,
2528 struct evsel *evsel,
2529 struct perf_sample *sample,
2530 struct symbol **parent,
2531 struct addr_location *root_al,
2536 callchain_cursor_reset(cursor);
2538 if (callchain_param.order == ORDER_CALLEE) {
2539 ret = thread__resolve_callchain_sample(thread, cursor,
2545 ret = thread__resolve_callchain_unwind(thread, cursor,
2549 ret = thread__resolve_callchain_unwind(thread, cursor,
2554 ret = thread__resolve_callchain_sample(thread, cursor,
2563 int machine__for_each_thread(struct machine *machine,
2564 int (*fn)(struct thread *thread, void *p),
2567 struct threads *threads;
2569 struct thread *thread;
2573 for (i = 0; i < THREADS__TABLE_SIZE; i++) {
2574 threads = &machine->threads[i];
2575 for (nd = rb_first_cached(&threads->entries); nd;
2577 thread = rb_entry(nd, struct thread, rb_node);
2578 rc = fn(thread, priv);
2583 list_for_each_entry(thread, &threads->dead, node) {
2584 rc = fn(thread, priv);
2592 int machines__for_each_thread(struct machines *machines,
2593 int (*fn)(struct thread *thread, void *p),
2599 rc = machine__for_each_thread(&machines->host, fn, priv);
2603 for (nd = rb_first_cached(&machines->guests); nd; nd = rb_next(nd)) {
2604 struct machine *machine = rb_entry(nd, struct machine, rb_node);
2606 rc = machine__for_each_thread(machine, fn, priv);
2613 pid_t machine__get_current_tid(struct machine *machine, int cpu)
2615 int nr_cpus = min(machine->env->nr_cpus_online, MAX_NR_CPUS);
2617 if (cpu < 0 || cpu >= nr_cpus || !machine->current_tid)
2620 return machine->current_tid[cpu];
2623 int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid,
2626 struct thread *thread;
2627 int nr_cpus = min(machine->env->nr_cpus_online, MAX_NR_CPUS);
2632 if (!machine->current_tid) {
2635 machine->current_tid = calloc(nr_cpus, sizeof(pid_t));
2636 if (!machine->current_tid)
2638 for (i = 0; i < nr_cpus; i++)
2639 machine->current_tid[i] = -1;
2642 if (cpu >= nr_cpus) {
2643 pr_err("Requested CPU %d too large. ", cpu);
2644 pr_err("Consider raising MAX_NR_CPUS\n");
2648 machine->current_tid[cpu] = tid;
2650 thread = machine__findnew_thread(machine, pid, tid);
2655 thread__put(thread);
2661 * Compares the raw arch string. N.B. see instead perf_env__arch() if a
2662 * normalized arch is needed.
2664 bool machine__is(struct machine *machine, const char *arch)
2666 return machine && !strcmp(perf_env__raw_arch(machine->env), arch);
2669 int machine__nr_cpus_avail(struct machine *machine)
2671 return machine ? perf_env__nr_cpus_avail(machine->env) : 0;
2674 int machine__get_kernel_start(struct machine *machine)
2676 struct map *map = machine__kernel_map(machine);
2680 * The only addresses above 2^63 are kernel addresses of a 64-bit
2681 * kernel. Note that addresses are unsigned so that on a 32-bit system
2682 * all addresses including kernel addresses are less than 2^32. In
2683 * that case (32-bit system), if the kernel mapping is unknown, all
2684 * addresses will be assumed to be in user space - see
2685 * machine__kernel_ip().
2687 machine->kernel_start = 1ULL << 63;
2689 err = map__load(map);
2691 * On x86_64, PTI entry trampolines are less than the
2692 * start of kernel text, but still above 2^63. So leave
2693 * kernel_start = 1ULL << 63 for x86_64.
2695 if (!err && !machine__is(machine, "x86_64"))
2696 machine->kernel_start = map->start;
2701 u8 machine__addr_cpumode(struct machine *machine, u8 cpumode, u64 addr)
2703 u8 addr_cpumode = cpumode;
2706 if (!machine->single_address_space)
2709 kernel_ip = machine__kernel_ip(machine, addr);
2711 case PERF_RECORD_MISC_KERNEL:
2712 case PERF_RECORD_MISC_USER:
2713 addr_cpumode = kernel_ip ? PERF_RECORD_MISC_KERNEL :
2714 PERF_RECORD_MISC_USER;
2716 case PERF_RECORD_MISC_GUEST_KERNEL:
2717 case PERF_RECORD_MISC_GUEST_USER:
2718 addr_cpumode = kernel_ip ? PERF_RECORD_MISC_GUEST_KERNEL :
2719 PERF_RECORD_MISC_GUEST_USER;
2725 return addr_cpumode;
2728 struct dso *machine__findnew_dso(struct machine *machine, const char *filename)
2730 return dsos__findnew(&machine->dsos, filename);
2733 char *machine__resolve_kernel_addr(void *vmachine, unsigned long long *addrp, char **modp)
2735 struct machine *machine = vmachine;
2737 struct symbol *sym = machine__find_kernel_symbol(machine, *addrp, &map);
2742 *modp = __map__is_kmodule(map) ? (char *)map->dso->short_name : NULL;
2743 *addrp = map->unmap_ip(map, sym->start);