1 // SPDX-License-Identifier: GPL-2.0
16 #include "map_symbol.h"
18 #include "mem-events.h"
29 #include <sys/types.h>
33 #include "linux/hash.h"
35 #include "bpf-event.h"
36 #include <internal/lib.h> // page_size
38 #include "arm64-frame-pointer-unwind-support.h"
40 #include <linux/ctype.h>
41 #include <symbol/kallsyms.h>
42 #include <linux/mman.h>
43 #include <linux/string.h>
44 #include <linux/zalloc.h>
46 static void __machine__remove_thread(struct machine *machine, struct thread_rb_node *nd,
47 struct thread *th, bool lock);
48 static int append_inlines(struct callchain_cursor *cursor, struct map_symbol *ms, u64 ip);
50 static struct dso *machine__kernel_dso(struct machine *machine)
52 return map__dso(machine->vmlinux_map);
55 static void dsos__init(struct dsos *dsos)
57 INIT_LIST_HEAD(&dsos->head);
59 init_rwsem(&dsos->lock);
62 static void machine__threads_init(struct machine *machine)
66 for (i = 0; i < THREADS__TABLE_SIZE; i++) {
67 struct threads *threads = &machine->threads[i];
68 threads->entries = RB_ROOT_CACHED;
69 init_rwsem(&threads->lock);
71 INIT_LIST_HEAD(&threads->dead);
72 threads->last_match = NULL;
76 static int thread_rb_node__cmp_tid(const void *key, const struct rb_node *nd)
78 int to_find = (int) *((pid_t *)key);
80 return to_find - (int)thread__tid(rb_entry(nd, struct thread_rb_node, rb_node)->thread);
83 static struct thread_rb_node *thread_rb_node__find(const struct thread *th,
86 pid_t to_find = thread__tid(th);
87 struct rb_node *nd = rb_find(&to_find, tree, thread_rb_node__cmp_tid);
89 return rb_entry(nd, struct thread_rb_node, rb_node);
92 static int machine__set_mmap_name(struct machine *machine)
94 if (machine__is_host(machine))
95 machine->mmap_name = strdup("[kernel.kallsyms]");
96 else if (machine__is_default_guest(machine))
97 machine->mmap_name = strdup("[guest.kernel.kallsyms]");
98 else if (asprintf(&machine->mmap_name, "[guest.kernel.kallsyms.%d]",
100 machine->mmap_name = NULL;
102 return machine->mmap_name ? 0 : -ENOMEM;
105 static void thread__set_guest_comm(struct thread *thread, pid_t pid)
109 snprintf(comm, sizeof(comm), "[guest/%d]", pid);
110 thread__set_comm(thread, comm, 0);
113 int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
117 memset(machine, 0, sizeof(*machine));
118 machine->kmaps = maps__new(machine);
119 if (machine->kmaps == NULL)
122 RB_CLEAR_NODE(&machine->rb_node);
123 dsos__init(&machine->dsos);
125 machine__threads_init(machine);
127 machine->vdso_info = NULL;
132 machine->id_hdr_size = 0;
133 machine->kptr_restrict_warned = false;
134 machine->comm_exec = false;
135 machine->kernel_start = 0;
136 machine->vmlinux_map = NULL;
138 machine->root_dir = strdup(root_dir);
139 if (machine->root_dir == NULL)
142 if (machine__set_mmap_name(machine))
145 if (pid != HOST_KERNEL_ID) {
146 struct thread *thread = machine__findnew_thread(machine, -1,
152 thread__set_guest_comm(thread, pid);
156 machine->current_tid = NULL;
161 zfree(&machine->kmaps);
162 zfree(&machine->root_dir);
163 zfree(&machine->mmap_name);
168 struct machine *machine__new_host(void)
170 struct machine *machine = malloc(sizeof(*machine));
172 if (machine != NULL) {
173 machine__init(machine, "", HOST_KERNEL_ID);
175 if (machine__create_kernel_maps(machine) < 0)
185 struct machine *machine__new_kallsyms(void)
187 struct machine *machine = machine__new_host();
190 * 1) We should switch to machine__load_kallsyms(), i.e. not explicitly
191 * ask for not using the kcore parsing code, once this one is fixed
192 * to create a map per module.
194 if (machine && machine__load_kallsyms(machine, "/proc/kallsyms") <= 0) {
195 machine__delete(machine);
202 static void dsos__purge(struct dsos *dsos)
206 down_write(&dsos->lock);
208 list_for_each_entry_safe(pos, n, &dsos->head, node) {
209 RB_CLEAR_NODE(&pos->rb_node);
211 list_del_init(&pos->node);
215 up_write(&dsos->lock);
218 static void dsos__exit(struct dsos *dsos)
221 exit_rwsem(&dsos->lock);
224 void machine__delete_threads(struct machine *machine)
229 for (i = 0; i < THREADS__TABLE_SIZE; i++) {
230 struct threads *threads = &machine->threads[i];
231 down_write(&threads->lock);
232 nd = rb_first_cached(&threads->entries);
234 struct thread_rb_node *trb = rb_entry(nd, struct thread_rb_node, rb_node);
237 __machine__remove_thread(machine, trb, trb->thread, false);
239 up_write(&threads->lock);
243 void machine__exit(struct machine *machine)
250 machine__destroy_kernel_maps(machine);
251 maps__zput(machine->kmaps);
252 dsos__exit(&machine->dsos);
253 machine__exit_vdso(machine);
254 zfree(&machine->root_dir);
255 zfree(&machine->mmap_name);
256 zfree(&machine->current_tid);
257 zfree(&machine->kallsyms_filename);
259 machine__delete_threads(machine);
260 for (i = 0; i < THREADS__TABLE_SIZE; i++) {
261 struct threads *threads = &machine->threads[i];
263 exit_rwsem(&threads->lock);
267 void machine__delete(struct machine *machine)
270 machine__exit(machine);
275 void machines__init(struct machines *machines)
277 machine__init(&machines->host, "", HOST_KERNEL_ID);
278 machines->guests = RB_ROOT_CACHED;
281 void machines__exit(struct machines *machines)
283 machine__exit(&machines->host);
287 struct machine *machines__add(struct machines *machines, pid_t pid,
288 const char *root_dir)
290 struct rb_node **p = &machines->guests.rb_root.rb_node;
291 struct rb_node *parent = NULL;
292 struct machine *pos, *machine = malloc(sizeof(*machine));
293 bool leftmost = true;
298 if (machine__init(machine, root_dir, pid) != 0) {
305 pos = rb_entry(parent, struct machine, rb_node);
314 rb_link_node(&machine->rb_node, parent, p);
315 rb_insert_color_cached(&machine->rb_node, &machines->guests, leftmost);
317 machine->machines = machines;
322 void machines__set_comm_exec(struct machines *machines, bool comm_exec)
326 machines->host.comm_exec = comm_exec;
328 for (nd = rb_first_cached(&machines->guests); nd; nd = rb_next(nd)) {
329 struct machine *machine = rb_entry(nd, struct machine, rb_node);
331 machine->comm_exec = comm_exec;
335 struct machine *machines__find(struct machines *machines, pid_t pid)
337 struct rb_node **p = &machines->guests.rb_root.rb_node;
338 struct rb_node *parent = NULL;
339 struct machine *machine;
340 struct machine *default_machine = NULL;
342 if (pid == HOST_KERNEL_ID)
343 return &machines->host;
347 machine = rb_entry(parent, struct machine, rb_node);
348 if (pid < machine->pid)
350 else if (pid > machine->pid)
355 default_machine = machine;
358 return default_machine;
361 struct machine *machines__findnew(struct machines *machines, pid_t pid)
364 const char *root_dir = "";
365 struct machine *machine = machines__find(machines, pid);
367 if (machine && (machine->pid == pid))
370 if ((pid != HOST_KERNEL_ID) &&
371 (pid != DEFAULT_GUEST_KERNEL_ID) &&
372 (symbol_conf.guestmount)) {
373 sprintf(path, "%s/%d", symbol_conf.guestmount, pid);
374 if (access(path, R_OK)) {
375 static struct strlist *seen;
378 seen = strlist__new(NULL, NULL);
380 if (!strlist__has_entry(seen, path)) {
381 pr_err("Can't access file %s\n", path);
382 strlist__add(seen, path);
390 machine = machines__add(machines, pid, root_dir);
395 struct machine *machines__find_guest(struct machines *machines, pid_t pid)
397 struct machine *machine = machines__find(machines, pid);
400 machine = machines__findnew(machines, DEFAULT_GUEST_KERNEL_ID);
405 * A common case for KVM test programs is that the test program acts as the
406 * hypervisor, creating, running and destroying the virtual machine, and
407 * providing the guest object code from its own object code. In this case,
408 * the VM is not running an OS, but only the functions loaded into it by the
409 * hypervisor test program, and conveniently, loaded at the same virtual
412 * Normally to resolve addresses, MMAP events are needed to map addresses
413 * back to the object code and debug symbols for that object code.
415 * Currently, there is no way to get such mapping information from guests
416 * but, in the scenario described above, the guest has the same mappings
417 * as the hypervisor, so support for that scenario can be achieved.
419 * To support that, copy the host thread's maps to the guest thread's maps.
420 * Note, we do not discover the guest until we encounter a guest event,
421 * which works well because it is not until then that we know that the host
422 * thread's maps have been set up.
424 * This function returns the guest thread. Apart from keeping the data
425 * structures sane, using a thread belonging to the guest machine, instead
426 * of the host thread, allows it to have its own comm (refer
427 * thread__set_guest_comm()).
429 static struct thread *findnew_guest_code(struct machine *machine,
430 struct machine *host_machine,
433 struct thread *host_thread;
434 struct thread *thread;
440 thread = machine__findnew_thread(machine, -1, pid);
444 /* Assume maps are set up if there are any */
445 if (maps__nr_maps(thread__maps(thread)))
448 host_thread = machine__find_thread(host_machine, -1, pid);
452 thread__set_guest_comm(thread, pid);
455 * Guest code can be found in hypervisor process at the same address
458 err = maps__clone(thread, thread__maps(host_thread));
459 thread__put(host_thread);
466 thread__zput(thread);
470 struct thread *machines__findnew_guest_code(struct machines *machines, pid_t pid)
472 struct machine *host_machine = machines__find(machines, HOST_KERNEL_ID);
473 struct machine *machine = machines__findnew(machines, pid);
475 return findnew_guest_code(machine, host_machine, pid);
478 struct thread *machine__findnew_guest_code(struct machine *machine, pid_t pid)
480 struct machines *machines = machine->machines;
481 struct machine *host_machine;
486 host_machine = machines__find(machines, HOST_KERNEL_ID);
488 return findnew_guest_code(machine, host_machine, pid);
491 void machines__process_guests(struct machines *machines,
492 machine__process_t process, void *data)
496 for (nd = rb_first_cached(&machines->guests); nd; nd = rb_next(nd)) {
497 struct machine *pos = rb_entry(nd, struct machine, rb_node);
502 void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size)
504 struct rb_node *node;
505 struct machine *machine;
507 machines->host.id_hdr_size = id_hdr_size;
509 for (node = rb_first_cached(&machines->guests); node;
510 node = rb_next(node)) {
511 machine = rb_entry(node, struct machine, rb_node);
512 machine->id_hdr_size = id_hdr_size;
518 static void machine__update_thread_pid(struct machine *machine,
519 struct thread *th, pid_t pid)
521 struct thread *leader;
523 if (pid == thread__pid(th) || pid == -1 || thread__pid(th) != -1)
526 thread__set_pid(th, pid);
528 if (thread__pid(th) == thread__tid(th))
531 leader = __machine__findnew_thread(machine, thread__pid(th), thread__pid(th));
535 if (!thread__maps(leader))
536 thread__set_maps(leader, maps__new(machine));
538 if (!thread__maps(leader))
541 if (thread__maps(th) == thread__maps(leader))
544 if (thread__maps(th)) {
546 * Maps are created from MMAP events which provide the pid and
547 * tid. Consequently there never should be any maps on a thread
548 * with an unknown pid. Just print an error if there are.
550 if (!maps__empty(thread__maps(th)))
551 pr_err("Discarding thread maps for %d:%d\n",
552 thread__pid(th), thread__tid(th));
553 maps__put(thread__maps(th));
556 thread__set_maps(th, maps__get(thread__maps(leader)));
561 pr_err("Failed to join map groups for %d:%d\n", thread__pid(th), thread__tid(th));
566 * Front-end cache - TID lookups come in blocks,
567 * so most of the time we dont have to look up
570 static struct thread*
571 __threads__get_last_match(struct threads *threads, struct machine *machine,
576 th = threads->last_match;
578 if (thread__tid(th) == tid) {
579 machine__update_thread_pid(machine, th, pid);
580 return thread__get(th);
582 thread__put(threads->last_match);
583 threads->last_match = NULL;
589 static struct thread*
590 threads__get_last_match(struct threads *threads, struct machine *machine,
593 struct thread *th = NULL;
595 if (perf_singlethreaded)
596 th = __threads__get_last_match(threads, machine, pid, tid);
602 __threads__set_last_match(struct threads *threads, struct thread *th)
604 thread__put(threads->last_match);
605 threads->last_match = thread__get(th);
609 threads__set_last_match(struct threads *threads, struct thread *th)
611 if (perf_singlethreaded)
612 __threads__set_last_match(threads, th);
616 * Caller must eventually drop thread->refcnt returned with a successful
617 * lookup/new thread inserted.
619 static struct thread *____machine__findnew_thread(struct machine *machine,
620 struct threads *threads,
621 pid_t pid, pid_t tid,
624 struct rb_node **p = &threads->entries.rb_root.rb_node;
625 struct rb_node *parent = NULL;
627 struct thread_rb_node *nd;
628 bool leftmost = true;
630 th = threads__get_last_match(threads, machine, pid, tid);
636 th = rb_entry(parent, struct thread_rb_node, rb_node)->thread;
638 if (thread__tid(th) == tid) {
639 threads__set_last_match(threads, th);
640 machine__update_thread_pid(machine, th, pid);
641 return thread__get(th);
644 if (tid < thread__tid(th))
655 th = thread__new(pid, tid);
659 nd = malloc(sizeof(*nd));
666 rb_link_node(&nd->rb_node, parent, p);
667 rb_insert_color_cached(&nd->rb_node, &threads->entries, leftmost);
669 * We have to initialize maps separately after rb tree is updated.
671 * The reason is that we call machine__findnew_thread within
672 * thread__init_maps to find the thread leader and that would screwed
675 if (thread__init_maps(th, machine)) {
676 pr_err("Thread init failed thread %d\n", pid);
677 rb_erase_cached(&nd->rb_node, &threads->entries);
678 RB_CLEAR_NODE(&nd->rb_node);
684 * It is now in the rbtree, get a ref
686 threads__set_last_match(threads, th);
689 return thread__get(th);
692 struct thread *__machine__findnew_thread(struct machine *machine, pid_t pid, pid_t tid)
694 return ____machine__findnew_thread(machine, machine__threads(machine, tid), pid, tid, true);
697 struct thread *machine__findnew_thread(struct machine *machine, pid_t pid,
700 struct threads *threads = machine__threads(machine, tid);
703 down_write(&threads->lock);
704 th = __machine__findnew_thread(machine, pid, tid);
705 up_write(&threads->lock);
709 struct thread *machine__find_thread(struct machine *machine, pid_t pid,
712 struct threads *threads = machine__threads(machine, tid);
715 down_read(&threads->lock);
716 th = ____machine__findnew_thread(machine, threads, pid, tid, false);
717 up_read(&threads->lock);
722 * Threads are identified by pid and tid, and the idle task has pid == tid == 0.
723 * So here a single thread is created for that, but actually there is a separate
724 * idle task per cpu, so there should be one 'struct thread' per cpu, but there
725 * is only 1. That causes problems for some tools, requiring workarounds. For
726 * example get_idle_thread() in builtin-sched.c, or thread_stack__per_cpu().
728 struct thread *machine__idle_thread(struct machine *machine)
730 struct thread *thread = machine__findnew_thread(machine, 0, 0);
732 if (!thread || thread__set_comm(thread, "swapper", 0) ||
733 thread__set_namespaces(thread, 0, NULL))
734 pr_err("problem inserting idle task for machine pid %d\n", machine->pid);
739 struct comm *machine__thread_exec_comm(struct machine *machine,
740 struct thread *thread)
742 if (machine->comm_exec)
743 return thread__exec_comm(thread);
745 return thread__comm(thread);
748 int machine__process_comm_event(struct machine *machine, union perf_event *event,
749 struct perf_sample *sample)
751 struct thread *thread = machine__findnew_thread(machine,
754 bool exec = event->header.misc & PERF_RECORD_MISC_COMM_EXEC;
758 machine->comm_exec = true;
761 perf_event__fprintf_comm(event, stdout);
763 if (thread == NULL ||
764 __thread__set_comm(thread, event->comm.comm, sample->time, exec)) {
765 dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n");
774 int machine__process_namespaces_event(struct machine *machine __maybe_unused,
775 union perf_event *event,
776 struct perf_sample *sample __maybe_unused)
778 struct thread *thread = machine__findnew_thread(machine,
779 event->namespaces.pid,
780 event->namespaces.tid);
783 WARN_ONCE(event->namespaces.nr_namespaces > NR_NAMESPACES,
784 "\nWARNING: kernel seems to support more namespaces than perf"
785 " tool.\nTry updating the perf tool..\n\n");
787 WARN_ONCE(event->namespaces.nr_namespaces < NR_NAMESPACES,
788 "\nWARNING: perf tool seems to support more namespaces than"
789 " the kernel.\nTry updating the kernel..\n\n");
792 perf_event__fprintf_namespaces(event, stdout);
794 if (thread == NULL ||
795 thread__set_namespaces(thread, sample->time, &event->namespaces)) {
796 dump_printf("problem processing PERF_RECORD_NAMESPACES, skipping event.\n");
805 int machine__process_cgroup_event(struct machine *machine,
806 union perf_event *event,
807 struct perf_sample *sample __maybe_unused)
812 perf_event__fprintf_cgroup(event, stdout);
814 cgrp = cgroup__findnew(machine->env, event->cgroup.id, event->cgroup.path);
821 int machine__process_lost_event(struct machine *machine __maybe_unused,
822 union perf_event *event, struct perf_sample *sample __maybe_unused)
824 dump_printf(": id:%" PRI_lu64 ": lost:%" PRI_lu64 "\n",
825 event->lost.id, event->lost.lost);
829 int machine__process_lost_samples_event(struct machine *machine __maybe_unused,
830 union perf_event *event, struct perf_sample *sample)
832 dump_printf(": id:%" PRIu64 ": lost samples :%" PRI_lu64 "\n",
833 sample->id, event->lost_samples.lost);
837 static struct dso *machine__findnew_module_dso(struct machine *machine,
839 const char *filename)
843 down_write(&machine->dsos.lock);
845 dso = __dsos__find(&machine->dsos, m->name, true);
847 dso = __dsos__addnew(&machine->dsos, m->name);
851 dso__set_module_info(dso, m, machine);
852 dso__set_long_name(dso, strdup(filename), true);
853 dso->kernel = DSO_SPACE__KERNEL;
858 up_write(&machine->dsos.lock);
862 int machine__process_aux_event(struct machine *machine __maybe_unused,
863 union perf_event *event)
866 perf_event__fprintf_aux(event, stdout);
870 int machine__process_itrace_start_event(struct machine *machine __maybe_unused,
871 union perf_event *event)
874 perf_event__fprintf_itrace_start(event, stdout);
878 int machine__process_aux_output_hw_id_event(struct machine *machine __maybe_unused,
879 union perf_event *event)
882 perf_event__fprintf_aux_output_hw_id(event, stdout);
886 int machine__process_switch_event(struct machine *machine __maybe_unused,
887 union perf_event *event)
890 perf_event__fprintf_switch(event, stdout);
894 static int machine__process_ksymbol_register(struct machine *machine,
895 union perf_event *event,
896 struct perf_sample *sample __maybe_unused)
900 struct map *map = maps__find(machine__kernel_maps(machine), event->ksymbol.addr);
901 bool put_map = false;
905 dso = dso__new(event->ksymbol.name);
911 dso->kernel = DSO_SPACE__KERNEL;
912 map = map__new2(0, dso);
919 * The inserted map has a get on it, we need to put to release
920 * the reference count here, but do it after all accesses are
924 if (event->ksymbol.ksym_type == PERF_RECORD_KSYMBOL_TYPE_OOL) {
925 dso->binary_type = DSO_BINARY_TYPE__OOL;
926 dso->data.file_size = event->ksymbol.len;
927 dso__set_loaded(dso);
930 map__set_start(map, event->ksymbol.addr);
931 map__set_end(map, map__start(map) + event->ksymbol.len);
932 err = maps__insert(machine__kernel_maps(machine), map);
938 dso__set_loaded(dso);
940 if (is_bpf_image(event->ksymbol.name)) {
941 dso->binary_type = DSO_BINARY_TYPE__BPF_IMAGE;
942 dso__set_long_name(dso, "", false);
948 sym = symbol__new(map__map_ip(map, map__start(map)),
950 0, 0, event->ksymbol.name);
955 dso__insert_symbol(dso, sym);
962 static int machine__process_ksymbol_unregister(struct machine *machine,
963 union perf_event *event,
964 struct perf_sample *sample __maybe_unused)
969 map = maps__find(machine__kernel_maps(machine), event->ksymbol.addr);
973 if (RC_CHK_ACCESS(map) != RC_CHK_ACCESS(machine->vmlinux_map))
974 maps__remove(machine__kernel_maps(machine), map);
976 struct dso *dso = map__dso(map);
978 sym = dso__find_symbol(dso, map__map_ip(map, map__start(map)));
980 dso__delete_symbol(dso, sym);
986 int machine__process_ksymbol(struct machine *machine __maybe_unused,
987 union perf_event *event,
988 struct perf_sample *sample)
991 perf_event__fprintf_ksymbol(event, stdout);
993 if (event->ksymbol.flags & PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER)
994 return machine__process_ksymbol_unregister(machine, event,
996 return machine__process_ksymbol_register(machine, event, sample);
999 int machine__process_text_poke(struct machine *machine, union perf_event *event,
1000 struct perf_sample *sample __maybe_unused)
1002 struct map *map = maps__find(machine__kernel_maps(machine), event->text_poke.addr);
1003 u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
1004 struct dso *dso = map ? map__dso(map) : NULL;
1007 perf_event__fprintf_text_poke(event, machine, stdout);
1009 if (!event->text_poke.new_len)
1012 if (cpumode != PERF_RECORD_MISC_KERNEL) {
1013 pr_debug("%s: unsupported cpumode - ignoring\n", __func__);
1018 u8 *new_bytes = event->text_poke.bytes + event->text_poke.old_len;
1022 * Kernel maps might be changed when loading symbols so loading
1023 * must be done prior to using kernel maps.
1026 ret = dso__data_write_cache_addr(dso, map, machine,
1027 event->text_poke.addr,
1029 event->text_poke.new_len);
1030 if (ret != event->text_poke.new_len)
1031 pr_debug("Failed to write kernel text poke at %#" PRI_lx64 "\n",
1032 event->text_poke.addr);
1034 pr_debug("Failed to find kernel text poke address map for %#" PRI_lx64 "\n",
1035 event->text_poke.addr);
1041 static struct map *machine__addnew_module_map(struct machine *machine, u64 start,
1042 const char *filename)
1044 struct map *map = NULL;
1049 if (kmod_path__parse_name(&m, filename))
1052 dso = machine__findnew_module_dso(machine, &m, filename);
1056 map = map__new2(start, dso);
1060 err = maps__insert(machine__kernel_maps(machine), map);
1061 /* If maps__insert failed, return NULL. */
1067 /* put the dso here, corresponding to machine__findnew_module_dso */
1073 size_t machines__fprintf_dsos(struct machines *machines, FILE *fp)
1076 size_t ret = __dsos__fprintf(&machines->host.dsos.head, fp);
1078 for (nd = rb_first_cached(&machines->guests); nd; nd = rb_next(nd)) {
1079 struct machine *pos = rb_entry(nd, struct machine, rb_node);
1080 ret += __dsos__fprintf(&pos->dsos.head, fp);
1086 size_t machine__fprintf_dsos_buildid(struct machine *m, FILE *fp,
1087 bool (skip)(struct dso *dso, int parm), int parm)
1089 return __dsos__fprintf_buildid(&m->dsos.head, fp, skip, parm);
1092 size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp,
1093 bool (skip)(struct dso *dso, int parm), int parm)
1096 size_t ret = machine__fprintf_dsos_buildid(&machines->host, fp, skip, parm);
1098 for (nd = rb_first_cached(&machines->guests); nd; nd = rb_next(nd)) {
1099 struct machine *pos = rb_entry(nd, struct machine, rb_node);
1100 ret += machine__fprintf_dsos_buildid(pos, fp, skip, parm);
1105 size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp)
1109 struct dso *kdso = machine__kernel_dso(machine);
1111 if (kdso->has_build_id) {
1112 char filename[PATH_MAX];
1113 if (dso__build_id_filename(kdso, filename, sizeof(filename),
1115 printed += fprintf(fp, "[0] %s\n", filename);
1118 for (i = 0; i < vmlinux_path__nr_entries; ++i)
1119 printed += fprintf(fp, "[%d] %s\n",
1120 i + kdso->has_build_id, vmlinux_path[i]);
1125 size_t machine__fprintf(struct machine *machine, FILE *fp)
1131 for (i = 0; i < THREADS__TABLE_SIZE; i++) {
1132 struct threads *threads = &machine->threads[i];
1134 down_read(&threads->lock);
1136 ret = fprintf(fp, "Threads: %u\n", threads->nr);
1138 for (nd = rb_first_cached(&threads->entries); nd;
1140 struct thread *pos = rb_entry(nd, struct thread_rb_node, rb_node)->thread;
1142 ret += thread__fprintf(pos, fp);
1145 up_read(&threads->lock);
1150 static struct dso *machine__get_kernel(struct machine *machine)
1152 const char *vmlinux_name = machine->mmap_name;
1155 if (machine__is_host(machine)) {
1156 if (symbol_conf.vmlinux_name)
1157 vmlinux_name = symbol_conf.vmlinux_name;
1159 kernel = machine__findnew_kernel(machine, vmlinux_name,
1160 "[kernel]", DSO_SPACE__KERNEL);
1162 if (symbol_conf.default_guest_vmlinux_name)
1163 vmlinux_name = symbol_conf.default_guest_vmlinux_name;
1165 kernel = machine__findnew_kernel(machine, vmlinux_name,
1167 DSO_SPACE__KERNEL_GUEST);
1170 if (kernel != NULL && (!kernel->has_build_id))
1171 dso__read_running_kernel_build_id(kernel, machine);
1176 void machine__get_kallsyms_filename(struct machine *machine, char *buf,
1179 if (machine__is_default_guest(machine))
1180 scnprintf(buf, bufsz, "%s", symbol_conf.default_guest_kallsyms);
1182 scnprintf(buf, bufsz, "%s/proc/kallsyms", machine->root_dir);
1185 const char *ref_reloc_sym_names[] = {"_text", "_stext", NULL};
1187 /* Figure out the start address of kernel map from /proc/kallsyms.
1188 * Returns the name of the start symbol in *symbol_name. Pass in NULL as
1189 * symbol_name if it's not that important.
1191 static int machine__get_running_kernel_start(struct machine *machine,
1192 const char **symbol_name,
1193 u64 *start, u64 *end)
1195 char filename[PATH_MAX];
1200 machine__get_kallsyms_filename(machine, filename, PATH_MAX);
1202 if (symbol__restricted_filename(filename, "/proc/kallsyms"))
1205 for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) {
1206 err = kallsyms__get_function_start(filename, name, &addr);
1215 *symbol_name = name;
1219 err = kallsyms__get_function_start(filename, "_etext", &addr);
1226 int machine__create_extra_kernel_map(struct machine *machine,
1228 struct extra_kernel_map *xm)
1234 map = map__new2(xm->start, kernel);
1238 map__set_end(map, xm->end);
1239 map__set_pgoff(map, xm->pgoff);
1241 kmap = map__kmap(map);
1243 strlcpy(kmap->name, xm->name, KMAP_NAME_LEN);
1245 err = maps__insert(machine__kernel_maps(machine), map);
1248 pr_debug2("Added extra kernel map %s %" PRIx64 "-%" PRIx64 "\n",
1249 kmap->name, map__start(map), map__end(map));
1257 static u64 find_entry_trampoline(struct dso *dso)
1259 /* Duplicates are removed so lookup all aliases */
1260 const char *syms[] = {
1261 "_entry_trampoline",
1262 "__entry_trampoline_start",
1263 "entry_SYSCALL_64_trampoline",
1265 struct symbol *sym = dso__first_symbol(dso);
1268 for (; sym; sym = dso__next_symbol(sym)) {
1269 if (sym->binding != STB_GLOBAL)
1271 for (i = 0; i < ARRAY_SIZE(syms); i++) {
1272 if (!strcmp(sym->name, syms[i]))
1281 * These values can be used for kernels that do not have symbols for the entry
1282 * trampolines in kallsyms.
1284 #define X86_64_CPU_ENTRY_AREA_PER_CPU 0xfffffe0000000000ULL
1285 #define X86_64_CPU_ENTRY_AREA_SIZE 0x2c000
1286 #define X86_64_ENTRY_TRAMPOLINE 0x6000
1288 /* Map x86_64 PTI entry trampolines */
1289 int machine__map_x86_64_entry_trampolines(struct machine *machine,
1292 struct maps *kmaps = machine__kernel_maps(machine);
1293 int nr_cpus_avail, cpu;
1295 struct map_rb_node *rb_node;
1299 * In the vmlinux case, pgoff is a virtual address which must now be
1300 * mapped to a vmlinux offset.
1302 maps__for_each_entry(kmaps, rb_node) {
1303 struct map *dest_map, *map = rb_node->map;
1304 struct kmap *kmap = __map__kmap(map);
1306 if (!kmap || !is_entry_trampoline(kmap->name))
1309 dest_map = maps__find(kmaps, map__pgoff(map));
1310 if (dest_map != map)
1311 map__set_pgoff(map, map__map_ip(dest_map, map__pgoff(map)));
1314 if (found || machine->trampolines_mapped)
1317 pgoff = find_entry_trampoline(kernel);
1321 nr_cpus_avail = machine__nr_cpus_avail(machine);
1323 /* Add a 1 page map for each CPU's entry trampoline */
1324 for (cpu = 0; cpu < nr_cpus_avail; cpu++) {
1325 u64 va = X86_64_CPU_ENTRY_AREA_PER_CPU +
1326 cpu * X86_64_CPU_ENTRY_AREA_SIZE +
1327 X86_64_ENTRY_TRAMPOLINE;
1328 struct extra_kernel_map xm = {
1330 .end = va + page_size,
1334 strlcpy(xm.name, ENTRY_TRAMPOLINE_NAME, KMAP_NAME_LEN);
1336 if (machine__create_extra_kernel_map(machine, kernel, &xm) < 0)
1340 machine->trampolines_mapped = nr_cpus_avail;
1345 int __weak machine__create_extra_kernel_maps(struct machine *machine __maybe_unused,
1346 struct dso *kernel __maybe_unused)
1352 __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
1354 /* In case of renewal the kernel map, destroy previous one */
1355 machine__destroy_kernel_maps(machine);
1357 map__put(machine->vmlinux_map);
1358 machine->vmlinux_map = map__new2(0, kernel);
1359 if (machine->vmlinux_map == NULL)
1362 map__set_map_ip(machine->vmlinux_map, identity__map_ip);
1363 map__set_unmap_ip(machine->vmlinux_map, identity__map_ip);
1364 return maps__insert(machine__kernel_maps(machine), machine->vmlinux_map);
1367 void machine__destroy_kernel_maps(struct machine *machine)
1370 struct map *map = machine__kernel_map(machine);
1375 kmap = map__kmap(map);
1376 maps__remove(machine__kernel_maps(machine), map);
1377 if (kmap && kmap->ref_reloc_sym) {
1378 zfree((char **)&kmap->ref_reloc_sym->name);
1379 zfree(&kmap->ref_reloc_sym);
1382 map__zput(machine->vmlinux_map);
1385 int machines__create_guest_kernel_maps(struct machines *machines)
1388 struct dirent **namelist = NULL;
1390 char path[PATH_MAX];
1394 if (symbol_conf.default_guest_vmlinux_name ||
1395 symbol_conf.default_guest_modules ||
1396 symbol_conf.default_guest_kallsyms) {
1397 machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID);
1400 if (symbol_conf.guestmount) {
1401 items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL);
1404 for (i = 0; i < items; i++) {
1405 if (!isdigit(namelist[i]->d_name[0])) {
1406 /* Filter out . and .. */
1409 pid = (pid_t)strtol(namelist[i]->d_name, &endp, 10);
1410 if ((*endp != '\0') ||
1411 (endp == namelist[i]->d_name) ||
1412 (errno == ERANGE)) {
1413 pr_debug("invalid directory (%s). Skipping.\n",
1414 namelist[i]->d_name);
1417 sprintf(path, "%s/%s/proc/kallsyms",
1418 symbol_conf.guestmount,
1419 namelist[i]->d_name);
1420 ret = access(path, R_OK);
1422 pr_debug("Can't access file %s\n", path);
1425 machines__create_kernel_maps(machines, pid);
1434 void machines__destroy_kernel_maps(struct machines *machines)
1436 struct rb_node *next = rb_first_cached(&machines->guests);
1438 machine__destroy_kernel_maps(&machines->host);
1441 struct machine *pos = rb_entry(next, struct machine, rb_node);
1443 next = rb_next(&pos->rb_node);
1444 rb_erase_cached(&pos->rb_node, &machines->guests);
1445 machine__delete(pos);
1449 int machines__create_kernel_maps(struct machines *machines, pid_t pid)
1451 struct machine *machine = machines__findnew(machines, pid);
1453 if (machine == NULL)
1456 return machine__create_kernel_maps(machine);
1459 int machine__load_kallsyms(struct machine *machine, const char *filename)
1461 struct map *map = machine__kernel_map(machine);
1462 struct dso *dso = map__dso(map);
1463 int ret = __dso__load_kallsyms(dso, filename, map, true);
1466 dso__set_loaded(dso);
1468 * Since /proc/kallsyms will have multiple sessions for the
1469 * kernel, with modules between them, fixup the end of all
1472 maps__fixup_end(machine__kernel_maps(machine));
1478 int machine__load_vmlinux_path(struct machine *machine)
1480 struct map *map = machine__kernel_map(machine);
1481 struct dso *dso = map__dso(map);
1482 int ret = dso__load_vmlinux_path(dso, map);
1485 dso__set_loaded(dso);
1490 static char *get_kernel_version(const char *root_dir)
1492 char version[PATH_MAX];
1495 const char *prefix = "Linux version ";
1497 sprintf(version, "%s/proc/version", root_dir);
1498 file = fopen(version, "r");
1502 tmp = fgets(version, sizeof(version), file);
1507 name = strstr(version, prefix);
1510 name += strlen(prefix);
1511 tmp = strchr(name, ' ');
1515 return strdup(name);
1518 static bool is_kmod_dso(struct dso *dso)
1520 return dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
1521 dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE;
1524 static int maps__set_module_path(struct maps *maps, const char *path, struct kmod_path *m)
1528 struct map *map = maps__find_by_name(maps, m->name);
1533 long_name = strdup(path);
1534 if (long_name == NULL)
1537 dso = map__dso(map);
1538 dso__set_long_name(dso, long_name, true);
1539 dso__kernel_module_get_build_id(dso, "");
1542 * Full name could reveal us kmod compression, so
1543 * we need to update the symtab_type if needed.
1545 if (m->comp && is_kmod_dso(dso)) {
1547 dso->comp = m->comp;
1553 static int maps__set_modules_path_dir(struct maps *maps, const char *dir_name, int depth)
1555 struct dirent *dent;
1556 DIR *dir = opendir(dir_name);
1560 pr_debug("%s: cannot open %s dir\n", __func__, dir_name);
1564 while ((dent = readdir(dir)) != NULL) {
1565 char path[PATH_MAX];
1568 /*sshfs might return bad dent->d_type, so we have to stat*/
1569 path__join(path, sizeof(path), dir_name, dent->d_name);
1570 if (stat(path, &st))
1573 if (S_ISDIR(st.st_mode)) {
1574 if (!strcmp(dent->d_name, ".") ||
1575 !strcmp(dent->d_name, ".."))
1578 /* Do not follow top-level source and build symlinks */
1580 if (!strcmp(dent->d_name, "source") ||
1581 !strcmp(dent->d_name, "build"))
1585 ret = maps__set_modules_path_dir(maps, path, depth + 1);
1591 ret = kmod_path__parse_name(&m, dent->d_name);
1596 ret = maps__set_module_path(maps, path, &m);
1610 static int machine__set_modules_path(struct machine *machine)
1613 char modules_path[PATH_MAX];
1615 version = get_kernel_version(machine->root_dir);
1619 snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s",
1620 machine->root_dir, version);
1623 return maps__set_modules_path_dir(machine__kernel_maps(machine), modules_path, 0);
1625 int __weak arch__fix_module_text_start(u64 *start __maybe_unused,
1626 u64 *size __maybe_unused,
1627 const char *name __maybe_unused)
1632 static int machine__create_module(void *arg, const char *name, u64 start,
1635 struct machine *machine = arg;
1638 if (arch__fix_module_text_start(&start, &size, name) < 0)
1641 map = machine__addnew_module_map(machine, start, name);
1644 map__set_end(map, start + size);
1646 dso__kernel_module_get_build_id(map__dso(map), machine->root_dir);
1651 static int machine__create_modules(struct machine *machine)
1653 const char *modules;
1654 char path[PATH_MAX];
1656 if (machine__is_default_guest(machine)) {
1657 modules = symbol_conf.default_guest_modules;
1659 snprintf(path, PATH_MAX, "%s/proc/modules", machine->root_dir);
1663 if (symbol__restricted_filename(modules, "/proc/modules"))
1666 if (modules__parse(modules, machine, machine__create_module))
1669 if (!machine__set_modules_path(machine))
1672 pr_debug("Problems setting modules path maps, continuing anyway...\n");
1677 static void machine__set_kernel_mmap(struct machine *machine,
1680 map__set_start(machine->vmlinux_map, start);
1681 map__set_end(machine->vmlinux_map, end);
1683 * Be a bit paranoid here, some perf.data file came with
1684 * a zero sized synthesized MMAP event for the kernel.
1686 if (start == 0 && end == 0)
1687 map__set_end(machine->vmlinux_map, ~0ULL);
1690 static int machine__update_kernel_mmap(struct machine *machine,
1693 struct map *orig, *updated;
1696 orig = machine->vmlinux_map;
1697 updated = map__get(orig);
1699 machine->vmlinux_map = updated;
1700 machine__set_kernel_mmap(machine, start, end);
1701 maps__remove(machine__kernel_maps(machine), orig);
1702 err = maps__insert(machine__kernel_maps(machine), updated);
1708 int machine__create_kernel_maps(struct machine *machine)
1710 struct dso *kernel = machine__get_kernel(machine);
1711 const char *name = NULL;
1712 u64 start = 0, end = ~0ULL;
1718 ret = __machine__create_kernel_maps(machine, kernel);
1722 if (symbol_conf.use_modules && machine__create_modules(machine) < 0) {
1723 if (machine__is_host(machine))
1724 pr_debug("Problems creating module maps, "
1725 "continuing anyway...\n");
1727 pr_debug("Problems creating module maps for guest %d, "
1728 "continuing anyway...\n", machine->pid);
1731 if (!machine__get_running_kernel_start(machine, &name, &start, &end)) {
1733 map__set_kallsyms_ref_reloc_sym(machine->vmlinux_map, name, start)) {
1734 machine__destroy_kernel_maps(machine);
1740 * we have a real start address now, so re-order the kmaps
1741 * assume it's the last in the kmaps
1743 ret = machine__update_kernel_mmap(machine, start, end);
1748 if (machine__create_extra_kernel_maps(machine, kernel))
1749 pr_debug("Problems creating extra kernel maps, continuing anyway...\n");
1752 /* update end address of the kernel map using adjacent module address */
1753 struct map_rb_node *rb_node = maps__find_node(machine__kernel_maps(machine),
1754 machine__kernel_map(machine));
1755 struct map_rb_node *next = map_rb_node__next(rb_node);
1758 machine__set_kernel_mmap(machine, start, map__start(next->map));
1766 static bool machine__uses_kcore(struct machine *machine)
1770 list_for_each_entry(dso, &machine->dsos.head, node) {
1771 if (dso__is_kcore(dso))
1778 static bool perf_event__is_extra_kernel_mmap(struct machine *machine,
1779 struct extra_kernel_map *xm)
1781 return machine__is(machine, "x86_64") &&
1782 is_entry_trampoline(xm->name);
1785 static int machine__process_extra_kernel_map(struct machine *machine,
1786 struct extra_kernel_map *xm)
1788 struct dso *kernel = machine__kernel_dso(machine);
1793 return machine__create_extra_kernel_map(machine, kernel, xm);
1796 static int machine__process_kernel_mmap_event(struct machine *machine,
1797 struct extra_kernel_map *xm,
1798 struct build_id *bid)
1800 enum dso_space_type dso_space;
1801 bool is_kernel_mmap;
1802 const char *mmap_name = machine->mmap_name;
1804 /* If we have maps from kcore then we do not need or want any others */
1805 if (machine__uses_kcore(machine))
1808 if (machine__is_host(machine))
1809 dso_space = DSO_SPACE__KERNEL;
1811 dso_space = DSO_SPACE__KERNEL_GUEST;
1813 is_kernel_mmap = memcmp(xm->name, mmap_name, strlen(mmap_name) - 1) == 0;
1814 if (!is_kernel_mmap && !machine__is_host(machine)) {
1816 * If the event was recorded inside the guest and injected into
1817 * the host perf.data file, then it will match a host mmap_name,
1818 * so try that - see machine__set_mmap_name().
1820 mmap_name = "[kernel.kallsyms]";
1821 is_kernel_mmap = memcmp(xm->name, mmap_name, strlen(mmap_name) - 1) == 0;
1823 if (xm->name[0] == '/' ||
1824 (!is_kernel_mmap && xm->name[0] == '[')) {
1825 struct map *map = machine__addnew_module_map(machine, xm->start, xm->name);
1830 map__set_end(map, map__start(map) + xm->end - xm->start);
1832 if (build_id__is_defined(bid))
1833 dso__set_build_id(map__dso(map), bid);
1836 } else if (is_kernel_mmap) {
1837 const char *symbol_name = xm->name + strlen(mmap_name);
1839 * Should be there already, from the build-id table in
1842 struct dso *kernel = NULL;
1845 down_read(&machine->dsos.lock);
1847 list_for_each_entry(dso, &machine->dsos.head, node) {
1850 * The cpumode passed to is_kernel_module is not the
1851 * cpumode of *this* event. If we insist on passing
1852 * correct cpumode to is_kernel_module, we should
1853 * record the cpumode when we adding this dso to the
1856 * However we don't really need passing correct
1857 * cpumode. We know the correct cpumode must be kernel
1858 * mode (if not, we should not link it onto kernel_dsos
1861 * Therefore, we pass PERF_RECORD_MISC_CPUMODE_UNKNOWN.
1862 * is_kernel_module() treats it as a kernel cpumode.
1866 is_kernel_module(dso->long_name,
1867 PERF_RECORD_MISC_CPUMODE_UNKNOWN))
1871 kernel = dso__get(dso);
1875 up_read(&machine->dsos.lock);
1878 kernel = machine__findnew_dso(machine, machine->mmap_name);
1882 kernel->kernel = dso_space;
1883 if (__machine__create_kernel_maps(machine, kernel) < 0) {
1888 if (strstr(kernel->long_name, "vmlinux"))
1889 dso__set_short_name(kernel, "[kernel.vmlinux]", false);
1891 if (machine__update_kernel_mmap(machine, xm->start, xm->end) < 0) {
1896 if (build_id__is_defined(bid))
1897 dso__set_build_id(kernel, bid);
1900 * Avoid using a zero address (kptr_restrict) for the ref reloc
1901 * symbol. Effectively having zero here means that at record
1902 * time /proc/sys/kernel/kptr_restrict was non zero.
1904 if (xm->pgoff != 0) {
1905 map__set_kallsyms_ref_reloc_sym(machine->vmlinux_map,
1910 if (machine__is_default_guest(machine)) {
1912 * preload dso of guest kernel and modules
1914 dso__load(kernel, machine__kernel_map(machine));
1917 } else if (perf_event__is_extra_kernel_mmap(machine, xm)) {
1918 return machine__process_extra_kernel_map(machine, xm);
1925 int machine__process_mmap2_event(struct machine *machine,
1926 union perf_event *event,
1927 struct perf_sample *sample)
1929 struct thread *thread;
1931 struct dso_id dso_id = {
1932 .maj = event->mmap2.maj,
1933 .min = event->mmap2.min,
1934 .ino = event->mmap2.ino,
1935 .ino_generation = event->mmap2.ino_generation,
1937 struct build_id __bid, *bid = NULL;
1941 perf_event__fprintf_mmap2(event, stdout);
1943 if (event->header.misc & PERF_RECORD_MISC_MMAP_BUILD_ID) {
1945 build_id__init(bid, event->mmap2.build_id, event->mmap2.build_id_size);
1948 if (sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
1949 sample->cpumode == PERF_RECORD_MISC_KERNEL) {
1950 struct extra_kernel_map xm = {
1951 .start = event->mmap2.start,
1952 .end = event->mmap2.start + event->mmap2.len,
1953 .pgoff = event->mmap2.pgoff,
1956 strlcpy(xm.name, event->mmap2.filename, KMAP_NAME_LEN);
1957 ret = machine__process_kernel_mmap_event(machine, &xm, bid);
1963 thread = machine__findnew_thread(machine, event->mmap2.pid,
1968 map = map__new(machine, event->mmap2.start,
1969 event->mmap2.len, event->mmap2.pgoff,
1970 &dso_id, event->mmap2.prot,
1971 event->mmap2.flags, bid,
1972 event->mmap2.filename, thread);
1975 goto out_problem_map;
1977 ret = thread__insert_map(thread, map);
1979 goto out_problem_insert;
1981 thread__put(thread);
1988 thread__put(thread);
1990 dump_printf("problem processing PERF_RECORD_MMAP2, skipping event.\n");
1994 int machine__process_mmap_event(struct machine *machine, union perf_event *event,
1995 struct perf_sample *sample)
1997 struct thread *thread;
2003 perf_event__fprintf_mmap(event, stdout);
2005 if (sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
2006 sample->cpumode == PERF_RECORD_MISC_KERNEL) {
2007 struct extra_kernel_map xm = {
2008 .start = event->mmap.start,
2009 .end = event->mmap.start + event->mmap.len,
2010 .pgoff = event->mmap.pgoff,
2013 strlcpy(xm.name, event->mmap.filename, KMAP_NAME_LEN);
2014 ret = machine__process_kernel_mmap_event(machine, &xm, NULL);
2020 thread = machine__findnew_thread(machine, event->mmap.pid,
2025 if (!(event->header.misc & PERF_RECORD_MISC_MMAP_DATA))
2028 map = map__new(machine, event->mmap.start,
2029 event->mmap.len, event->mmap.pgoff,
2030 NULL, prot, 0, NULL, event->mmap.filename, thread);
2033 goto out_problem_map;
2035 ret = thread__insert_map(thread, map);
2037 goto out_problem_insert;
2039 thread__put(thread);
2046 thread__put(thread);
2048 dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n");
2052 static void __machine__remove_thread(struct machine *machine, struct thread_rb_node *nd,
2053 struct thread *th, bool lock)
2055 struct threads *threads = machine__threads(machine, thread__tid(th));
2058 nd = thread_rb_node__find(th, &threads->entries.rb_root);
2060 if (threads->last_match && RC_CHK_ACCESS(threads->last_match) == RC_CHK_ACCESS(th))
2061 threads__set_last_match(threads, NULL);
2064 down_write(&threads->lock);
2066 BUG_ON(refcount_read(thread__refcnt(th)) == 0);
2068 thread__put(nd->thread);
2069 rb_erase_cached(&nd->rb_node, &threads->entries);
2070 RB_CLEAR_NODE(&nd->rb_node);
2076 up_write(&threads->lock);
2079 void machine__remove_thread(struct machine *machine, struct thread *th)
2081 return __machine__remove_thread(machine, NULL, th, true);
2084 int machine__process_fork_event(struct machine *machine, union perf_event *event,
2085 struct perf_sample *sample)
2087 struct thread *thread = machine__find_thread(machine,
2090 struct thread *parent = machine__findnew_thread(machine,
2093 bool do_maps_clone = true;
2097 perf_event__fprintf_task(event, stdout);
2100 * There may be an existing thread that is not actually the parent,
2101 * either because we are processing events out of order, or because the
2102 * (fork) event that would have removed the thread was lost. Assume the
2103 * latter case and continue on as best we can.
2105 if (thread__pid(parent) != (pid_t)event->fork.ppid) {
2106 dump_printf("removing erroneous parent thread %d/%d\n",
2107 thread__pid(parent), thread__tid(parent));
2108 machine__remove_thread(machine, parent);
2109 thread__put(parent);
2110 parent = machine__findnew_thread(machine, event->fork.ppid,
2114 /* if a thread currently exists for the thread id remove it */
2115 if (thread != NULL) {
2116 machine__remove_thread(machine, thread);
2117 thread__put(thread);
2120 thread = machine__findnew_thread(machine, event->fork.pid,
2123 * When synthesizing FORK events, we are trying to create thread
2124 * objects for the already running tasks on the machine.
2126 * Normally, for a kernel FORK event, we want to clone the parent's
2127 * maps because that is what the kernel just did.
2129 * But when synthesizing, this should not be done. If we do, we end up
2130 * with overlapping maps as we process the synthesized MMAP2 events that
2131 * get delivered shortly thereafter.
2133 * Use the FORK event misc flags in an internal way to signal this
2134 * situation, so we can elide the map clone when appropriate.
2136 if (event->fork.header.misc & PERF_RECORD_MISC_FORK_EXEC)
2137 do_maps_clone = false;
2139 if (thread == NULL || parent == NULL ||
2140 thread__fork(thread, parent, sample->time, do_maps_clone) < 0) {
2141 dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
2144 thread__put(thread);
2145 thread__put(parent);
2150 int machine__process_exit_event(struct machine *machine, union perf_event *event,
2151 struct perf_sample *sample __maybe_unused)
2153 struct thread *thread = machine__find_thread(machine,
2158 perf_event__fprintf_task(event, stdout);
2161 thread__put(thread);
2166 int machine__process_event(struct machine *machine, union perf_event *event,
2167 struct perf_sample *sample)
2171 switch (event->header.type) {
2172 case PERF_RECORD_COMM:
2173 ret = machine__process_comm_event(machine, event, sample); break;
2174 case PERF_RECORD_MMAP:
2175 ret = machine__process_mmap_event(machine, event, sample); break;
2176 case PERF_RECORD_NAMESPACES:
2177 ret = machine__process_namespaces_event(machine, event, sample); break;
2178 case PERF_RECORD_CGROUP:
2179 ret = machine__process_cgroup_event(machine, event, sample); break;
2180 case PERF_RECORD_MMAP2:
2181 ret = machine__process_mmap2_event(machine, event, sample); break;
2182 case PERF_RECORD_FORK:
2183 ret = machine__process_fork_event(machine, event, sample); break;
2184 case PERF_RECORD_EXIT:
2185 ret = machine__process_exit_event(machine, event, sample); break;
2186 case PERF_RECORD_LOST:
2187 ret = machine__process_lost_event(machine, event, sample); break;
2188 case PERF_RECORD_AUX:
2189 ret = machine__process_aux_event(machine, event); break;
2190 case PERF_RECORD_ITRACE_START:
2191 ret = machine__process_itrace_start_event(machine, event); break;
2192 case PERF_RECORD_LOST_SAMPLES:
2193 ret = machine__process_lost_samples_event(machine, event, sample); break;
2194 case PERF_RECORD_SWITCH:
2195 case PERF_RECORD_SWITCH_CPU_WIDE:
2196 ret = machine__process_switch_event(machine, event); break;
2197 case PERF_RECORD_KSYMBOL:
2198 ret = machine__process_ksymbol(machine, event, sample); break;
2199 case PERF_RECORD_BPF_EVENT:
2200 ret = machine__process_bpf(machine, event, sample); break;
2201 case PERF_RECORD_TEXT_POKE:
2202 ret = machine__process_text_poke(machine, event, sample); break;
2203 case PERF_RECORD_AUX_OUTPUT_HW_ID:
2204 ret = machine__process_aux_output_hw_id_event(machine, event); break;
2213 static bool symbol__match_regex(struct symbol *sym, regex_t *regex)
2215 if (!regexec(regex, sym->name, 0, NULL, 0))
2220 static void ip__resolve_ams(struct thread *thread,
2221 struct addr_map_symbol *ams,
2224 struct addr_location al;
2226 addr_location__init(&al);
2228 * We cannot use the header.misc hint to determine whether a
2229 * branch stack address is user, kernel, guest, hypervisor.
2230 * Branches may straddle the kernel/user/hypervisor boundaries.
2231 * Thus, we have to try consecutively until we find a match
2232 * or else, the symbol is unknown
2234 thread__find_cpumode_addr_location(thread, ip, &al);
2237 ams->al_addr = al.addr;
2238 ams->al_level = al.level;
2239 ams->ms.maps = maps__get(al.maps);
2240 ams->ms.sym = al.sym;
2241 ams->ms.map = map__get(al.map);
2243 ams->data_page_size = 0;
2244 addr_location__exit(&al);
2247 static void ip__resolve_data(struct thread *thread,
2248 u8 m, struct addr_map_symbol *ams,
2249 u64 addr, u64 phys_addr, u64 daddr_page_size)
2251 struct addr_location al;
2253 addr_location__init(&al);
2255 thread__find_symbol(thread, m, addr, &al);
2258 ams->al_addr = al.addr;
2259 ams->al_level = al.level;
2260 ams->ms.maps = maps__get(al.maps);
2261 ams->ms.sym = al.sym;
2262 ams->ms.map = map__get(al.map);
2263 ams->phys_addr = phys_addr;
2264 ams->data_page_size = daddr_page_size;
2265 addr_location__exit(&al);
2268 struct mem_info *sample__resolve_mem(struct perf_sample *sample,
2269 struct addr_location *al)
2271 struct mem_info *mi = mem_info__new();
2276 ip__resolve_ams(al->thread, &mi->iaddr, sample->ip);
2277 ip__resolve_data(al->thread, al->cpumode, &mi->daddr,
2278 sample->addr, sample->phys_addr,
2279 sample->data_page_size);
2280 mi->data_src.val = sample->data_src;
2285 static char *callchain_srcline(struct map_symbol *ms, u64 ip)
2287 struct map *map = ms->map;
2288 char *srcline = NULL;
2291 if (!map || callchain_param.key == CCKEY_FUNCTION)
2294 dso = map__dso(map);
2295 srcline = srcline__tree_find(&dso->srclines, ip);
2297 bool show_sym = false;
2298 bool show_addr = callchain_param.key == CCKEY_ADDRESS;
2300 srcline = get_srcline(dso, map__rip_2objdump(map, ip),
2301 ms->sym, show_sym, show_addr, ip);
2302 srcline__tree_insert(&dso->srclines, ip, srcline);
2313 static int add_callchain_ip(struct thread *thread,
2314 struct callchain_cursor *cursor,
2315 struct symbol **parent,
2316 struct addr_location *root_al,
2320 struct branch_flags *flags,
2321 struct iterations *iter,
2324 struct map_symbol ms = {};
2325 struct addr_location al;
2326 int nr_loop_iter = 0, err = 0;
2327 u64 iter_cycles = 0;
2328 const char *srcline = NULL;
2330 addr_location__init(&al);
2335 thread__find_cpumode_addr_location(thread, ip, &al);
2337 if (ip >= PERF_CONTEXT_MAX) {
2339 case PERF_CONTEXT_HV:
2340 *cpumode = PERF_RECORD_MISC_HYPERVISOR;
2342 case PERF_CONTEXT_KERNEL:
2343 *cpumode = PERF_RECORD_MISC_KERNEL;
2345 case PERF_CONTEXT_USER:
2346 *cpumode = PERF_RECORD_MISC_USER;
2349 pr_debug("invalid callchain context: "
2350 "%"PRId64"\n", (s64) ip);
2352 * It seems the callchain is corrupted.
2355 callchain_cursor_reset(cursor);
2361 thread__find_symbol(thread, *cpumode, ip, &al);
2364 if (al.sym != NULL) {
2365 if (perf_hpp_list.parent && !*parent &&
2366 symbol__match_regex(al.sym, &parent_regex))
2368 else if (have_ignore_callees && root_al &&
2369 symbol__match_regex(al.sym, &ignore_callees_regex)) {
2370 /* Treat this symbol as the root,
2371 forgetting its callees. */
2372 addr_location__copy(root_al, &al);
2373 callchain_cursor_reset(cursor);
2377 if (symbol_conf.hide_unresolved && al.sym == NULL)
2381 nr_loop_iter = iter->nr_loop_iter;
2382 iter_cycles = iter->cycles;
2385 ms.maps = maps__get(al.maps);
2386 ms.map = map__get(al.map);
2389 if (!branch && append_inlines(cursor, &ms, ip) == 0)
2392 srcline = callchain_srcline(&ms, al.addr);
2393 err = callchain_cursor_append(cursor, ip, &ms,
2394 branch, flags, nr_loop_iter,
2395 iter_cycles, branch_from, srcline);
2397 addr_location__exit(&al);
2403 struct branch_info *sample__resolve_bstack(struct perf_sample *sample,
2404 struct addr_location *al)
2407 const struct branch_stack *bs = sample->branch_stack;
2408 struct branch_entry *entries = perf_sample__branch_entries(sample);
2409 struct branch_info *bi = calloc(bs->nr, sizeof(struct branch_info));
2414 for (i = 0; i < bs->nr; i++) {
2415 ip__resolve_ams(al->thread, &bi[i].to, entries[i].to);
2416 ip__resolve_ams(al->thread, &bi[i].from, entries[i].from);
2417 bi[i].flags = entries[i].flags;
2422 static void save_iterations(struct iterations *iter,
2423 struct branch_entry *be, int nr)
2427 iter->nr_loop_iter++;
2430 for (i = 0; i < nr; i++)
2431 iter->cycles += be[i].flags.cycles;
2436 #define NO_ENTRY 0xff
2438 #define PERF_MAX_BRANCH_DEPTH 127
2441 static int remove_loops(struct branch_entry *l, int nr,
2442 struct iterations *iter)
2445 unsigned char chash[CHASHSZ];
2447 memset(chash, NO_ENTRY, sizeof(chash));
2449 BUG_ON(PERF_MAX_BRANCH_DEPTH > 255);
2451 for (i = 0; i < nr; i++) {
2452 int h = hash_64(l[i].from, CHASHBITS) % CHASHSZ;
2454 /* no collision handling for now */
2455 if (chash[h] == NO_ENTRY) {
2457 } else if (l[chash[h]].from == l[i].from) {
2458 bool is_loop = true;
2459 /* check if it is a real loop */
2461 for (j = chash[h]; j < i && i + off < nr; j++, off++)
2462 if (l[j].from != l[i + off].from) {
2469 save_iterations(iter + i + off,
2472 memmove(iter + i, iter + i + off,
2475 memmove(l + i, l + i + off,
2486 static int lbr_callchain_add_kernel_ip(struct thread *thread,
2487 struct callchain_cursor *cursor,
2488 struct perf_sample *sample,
2489 struct symbol **parent,
2490 struct addr_location *root_al,
2492 bool callee, int end)
2494 struct ip_callchain *chain = sample->callchain;
2495 u8 cpumode = PERF_RECORD_MISC_USER;
2499 for (i = 0; i < end + 1; i++) {
2500 err = add_callchain_ip(thread, cursor, parent,
2501 root_al, &cpumode, chain->ips[i],
2502 false, NULL, NULL, branch_from);
2509 for (i = end; i >= 0; i--) {
2510 err = add_callchain_ip(thread, cursor, parent,
2511 root_al, &cpumode, chain->ips[i],
2512 false, NULL, NULL, branch_from);
2520 static void save_lbr_cursor_node(struct thread *thread,
2521 struct callchain_cursor *cursor,
2524 struct lbr_stitch *lbr_stitch = thread__lbr_stitch(thread);
2529 if (cursor->pos == cursor->nr) {
2530 lbr_stitch->prev_lbr_cursor[idx].valid = false;
2535 cursor->curr = cursor->first;
2537 cursor->curr = cursor->curr->next;
2538 memcpy(&lbr_stitch->prev_lbr_cursor[idx], cursor->curr,
2539 sizeof(struct callchain_cursor_node));
2541 lbr_stitch->prev_lbr_cursor[idx].valid = true;
2545 static int lbr_callchain_add_lbr_ip(struct thread *thread,
2546 struct callchain_cursor *cursor,
2547 struct perf_sample *sample,
2548 struct symbol **parent,
2549 struct addr_location *root_al,
2553 struct branch_stack *lbr_stack = sample->branch_stack;
2554 struct branch_entry *entries = perf_sample__branch_entries(sample);
2555 u8 cpumode = PERF_RECORD_MISC_USER;
2556 int lbr_nr = lbr_stack->nr;
2557 struct branch_flags *flags;
2562 * The curr and pos are not used in writing session. They are cleared
2563 * in callchain_cursor_commit() when the writing session is closed.
2564 * Using curr and pos to track the current cursor node.
2566 if (thread__lbr_stitch(thread)) {
2567 cursor->curr = NULL;
2568 cursor->pos = cursor->nr;
2570 cursor->curr = cursor->first;
2571 for (i = 0; i < (int)(cursor->nr - 1); i++)
2572 cursor->curr = cursor->curr->next;
2577 /* Add LBR ip from first entries.to */
2579 flags = &entries[0].flags;
2580 *branch_from = entries[0].from;
2581 err = add_callchain_ip(thread, cursor, parent,
2582 root_al, &cpumode, ip,
2589 * The number of cursor node increases.
2590 * Move the current cursor node.
2591 * But does not need to save current cursor node for entry 0.
2592 * It's impossible to stitch the whole LBRs of previous sample.
2594 if (thread__lbr_stitch(thread) && (cursor->pos != cursor->nr)) {
2596 cursor->curr = cursor->first;
2598 cursor->curr = cursor->curr->next;
2602 /* Add LBR ip from entries.from one by one. */
2603 for (i = 0; i < lbr_nr; i++) {
2604 ip = entries[i].from;
2605 flags = &entries[i].flags;
2606 err = add_callchain_ip(thread, cursor, parent,
2607 root_al, &cpumode, ip,
2612 save_lbr_cursor_node(thread, cursor, i);
2617 /* Add LBR ip from entries.from one by one. */
2618 for (i = lbr_nr - 1; i >= 0; i--) {
2619 ip = entries[i].from;
2620 flags = &entries[i].flags;
2621 err = add_callchain_ip(thread, cursor, parent,
2622 root_al, &cpumode, ip,
2627 save_lbr_cursor_node(thread, cursor, i);
2630 /* Add LBR ip from first entries.to */
2632 flags = &entries[0].flags;
2633 *branch_from = entries[0].from;
2634 err = add_callchain_ip(thread, cursor, parent,
2635 root_al, &cpumode, ip,
2644 static int lbr_callchain_add_stitched_lbr_ip(struct thread *thread,
2645 struct callchain_cursor *cursor)
2647 struct lbr_stitch *lbr_stitch = thread__lbr_stitch(thread);
2648 struct callchain_cursor_node *cnode;
2649 struct stitch_list *stitch_node;
2652 list_for_each_entry(stitch_node, &lbr_stitch->lists, node) {
2653 cnode = &stitch_node->cursor;
2655 err = callchain_cursor_append(cursor, cnode->ip,
2658 &cnode->branch_flags,
2659 cnode->nr_loop_iter,
2669 static struct stitch_list *get_stitch_node(struct thread *thread)
2671 struct lbr_stitch *lbr_stitch = thread__lbr_stitch(thread);
2672 struct stitch_list *stitch_node;
2674 if (!list_empty(&lbr_stitch->free_lists)) {
2675 stitch_node = list_first_entry(&lbr_stitch->free_lists,
2676 struct stitch_list, node);
2677 list_del(&stitch_node->node);
2682 return malloc(sizeof(struct stitch_list));
2685 static bool has_stitched_lbr(struct thread *thread,
2686 struct perf_sample *cur,
2687 struct perf_sample *prev,
2688 unsigned int max_lbr,
2691 struct branch_stack *cur_stack = cur->branch_stack;
2692 struct branch_entry *cur_entries = perf_sample__branch_entries(cur);
2693 struct branch_stack *prev_stack = prev->branch_stack;
2694 struct branch_entry *prev_entries = perf_sample__branch_entries(prev);
2695 struct lbr_stitch *lbr_stitch = thread__lbr_stitch(thread);
2696 int i, j, nr_identical_branches = 0;
2697 struct stitch_list *stitch_node;
2698 u64 cur_base, distance;
2700 if (!cur_stack || !prev_stack)
2703 /* Find the physical index of the base-of-stack for current sample. */
2704 cur_base = max_lbr - cur_stack->nr + cur_stack->hw_idx + 1;
2706 distance = (prev_stack->hw_idx > cur_base) ? (prev_stack->hw_idx - cur_base) :
2707 (max_lbr + prev_stack->hw_idx - cur_base);
2708 /* Previous sample has shorter stack. Nothing can be stitched. */
2709 if (distance + 1 > prev_stack->nr)
2713 * Check if there are identical LBRs between two samples.
2714 * Identical LBRs must have same from, to and flags values. Also,
2715 * they have to be saved in the same LBR registers (same physical
2718 * Starts from the base-of-stack of current sample.
2720 for (i = distance, j = cur_stack->nr - 1; (i >= 0) && (j >= 0); i--, j--) {
2721 if ((prev_entries[i].from != cur_entries[j].from) ||
2722 (prev_entries[i].to != cur_entries[j].to) ||
2723 (prev_entries[i].flags.value != cur_entries[j].flags.value))
2725 nr_identical_branches++;
2728 if (!nr_identical_branches)
2732 * Save the LBRs between the base-of-stack of previous sample
2733 * and the base-of-stack of current sample into lbr_stitch->lists.
2734 * These LBRs will be stitched later.
2736 for (i = prev_stack->nr - 1; i > (int)distance; i--) {
2738 if (!lbr_stitch->prev_lbr_cursor[i].valid)
2741 stitch_node = get_stitch_node(thread);
2745 memcpy(&stitch_node->cursor, &lbr_stitch->prev_lbr_cursor[i],
2746 sizeof(struct callchain_cursor_node));
2749 list_add(&stitch_node->node, &lbr_stitch->lists);
2751 list_add_tail(&stitch_node->node, &lbr_stitch->lists);
2757 static bool alloc_lbr_stitch(struct thread *thread, unsigned int max_lbr)
2759 if (thread__lbr_stitch(thread))
2762 thread__set_lbr_stitch(thread, zalloc(sizeof(struct lbr_stitch)));
2763 if (!thread__lbr_stitch(thread))
2766 thread__lbr_stitch(thread)->prev_lbr_cursor =
2767 calloc(max_lbr + 1, sizeof(struct callchain_cursor_node));
2768 if (!thread__lbr_stitch(thread)->prev_lbr_cursor)
2769 goto free_lbr_stitch;
2771 INIT_LIST_HEAD(&thread__lbr_stitch(thread)->lists);
2772 INIT_LIST_HEAD(&thread__lbr_stitch(thread)->free_lists);
2777 free(thread__lbr_stitch(thread));
2778 thread__set_lbr_stitch(thread, NULL);
2780 pr_warning("Failed to allocate space for stitched LBRs. Disable LBR stitch\n");
2781 thread__set_lbr_stitch_enable(thread, false);
2786 * Resolve LBR callstack chain sample
2788 * 1 on success get LBR callchain information
2789 * 0 no available LBR callchain information, should try fp
2790 * negative error code on other errors.
2792 static int resolve_lbr_callchain_sample(struct thread *thread,
2793 struct callchain_cursor *cursor,
2794 struct perf_sample *sample,
2795 struct symbol **parent,
2796 struct addr_location *root_al,
2798 unsigned int max_lbr)
2800 bool callee = (callchain_param.order == ORDER_CALLEE);
2801 struct ip_callchain *chain = sample->callchain;
2802 int chain_nr = min(max_stack, (int)chain->nr), i;
2803 struct lbr_stitch *lbr_stitch;
2804 bool stitched_lbr = false;
2805 u64 branch_from = 0;
2808 for (i = 0; i < chain_nr; i++) {
2809 if (chain->ips[i] == PERF_CONTEXT_USER)
2813 /* LBR only affects the user callchain */
2817 if (thread__lbr_stitch_enable(thread) && !sample->no_hw_idx &&
2818 (max_lbr > 0) && alloc_lbr_stitch(thread, max_lbr)) {
2819 lbr_stitch = thread__lbr_stitch(thread);
2821 stitched_lbr = has_stitched_lbr(thread, sample,
2822 &lbr_stitch->prev_sample,
2825 if (!stitched_lbr && !list_empty(&lbr_stitch->lists)) {
2826 list_replace_init(&lbr_stitch->lists,
2827 &lbr_stitch->free_lists);
2829 memcpy(&lbr_stitch->prev_sample, sample, sizeof(*sample));
2834 err = lbr_callchain_add_kernel_ip(thread, cursor, sample,
2835 parent, root_al, branch_from,
2840 err = lbr_callchain_add_lbr_ip(thread, cursor, sample, parent,
2841 root_al, &branch_from, true);
2846 err = lbr_callchain_add_stitched_lbr_ip(thread, cursor);
2853 err = lbr_callchain_add_stitched_lbr_ip(thread, cursor);
2857 err = lbr_callchain_add_lbr_ip(thread, cursor, sample, parent,
2858 root_al, &branch_from, false);
2863 err = lbr_callchain_add_kernel_ip(thread, cursor, sample,
2864 parent, root_al, branch_from,
2872 return (err < 0) ? err : 0;
2875 static int find_prev_cpumode(struct ip_callchain *chain, struct thread *thread,
2876 struct callchain_cursor *cursor,
2877 struct symbol **parent,
2878 struct addr_location *root_al,
2879 u8 *cpumode, int ent)
2883 while (--ent >= 0) {
2884 u64 ip = chain->ips[ent];
2886 if (ip >= PERF_CONTEXT_MAX) {
2887 err = add_callchain_ip(thread, cursor, parent,
2888 root_al, cpumode, ip,
2889 false, NULL, NULL, 0);
2896 static u64 get_leaf_frame_caller(struct perf_sample *sample,
2897 struct thread *thread, int usr_idx)
2899 if (machine__normalized_is(maps__machine(thread__maps(thread)), "arm64"))
2900 return get_leaf_frame_caller_aarch64(sample, thread, usr_idx);
2905 static int thread__resolve_callchain_sample(struct thread *thread,
2906 struct callchain_cursor *cursor,
2907 struct evsel *evsel,
2908 struct perf_sample *sample,
2909 struct symbol **parent,
2910 struct addr_location *root_al,
2913 struct branch_stack *branch = sample->branch_stack;
2914 struct branch_entry *entries = perf_sample__branch_entries(sample);
2915 struct ip_callchain *chain = sample->callchain;
2917 u8 cpumode = PERF_RECORD_MISC_USER;
2918 int i, j, err, nr_entries, usr_idx;
2921 u64 leaf_frame_caller;
2924 chain_nr = chain->nr;
2926 if (evsel__has_branch_callstack(evsel)) {
2927 struct perf_env *env = evsel__env(evsel);
2929 err = resolve_lbr_callchain_sample(thread, cursor, sample, parent,
2931 !env ? 0 : env->max_branches);
2933 return (err < 0) ? err : 0;
2937 * Based on DWARF debug information, some architectures skip
2938 * a callchain entry saved by the kernel.
2940 skip_idx = arch_skip_callchain_idx(thread, chain);
2943 * Add branches to call stack for easier browsing. This gives
2944 * more context for a sample than just the callers.
2946 * This uses individual histograms of paths compared to the
2947 * aggregated histograms the normal LBR mode uses.
2949 * Limitations for now:
2950 * - No extra filters
2951 * - No annotations (should annotate somehow)
2954 if (branch && callchain_param.branch_callstack) {
2955 int nr = min(max_stack, (int)branch->nr);
2956 struct branch_entry be[nr];
2957 struct iterations iter[nr];
2959 if (branch->nr > PERF_MAX_BRANCH_DEPTH) {
2960 pr_warning("corrupted branch chain. skipping...\n");
2964 for (i = 0; i < nr; i++) {
2965 if (callchain_param.order == ORDER_CALLEE) {
2972 * Check for overlap into the callchain.
2973 * The return address is one off compared to
2974 * the branch entry. To adjust for this
2975 * assume the calling instruction is not longer
2978 if (i == skip_idx ||
2979 chain->ips[first_call] >= PERF_CONTEXT_MAX)
2981 else if (be[i].from < chain->ips[first_call] &&
2982 be[i].from >= chain->ips[first_call] - 8)
2985 be[i] = entries[branch->nr - i - 1];
2988 memset(iter, 0, sizeof(struct iterations) * nr);
2989 nr = remove_loops(be, nr, iter);
2991 for (i = 0; i < nr; i++) {
2992 err = add_callchain_ip(thread, cursor, parent,
2999 err = add_callchain_ip(thread, cursor, parent, root_al,
3016 if (chain && callchain_param.order != ORDER_CALLEE) {
3017 err = find_prev_cpumode(chain, thread, cursor, parent, root_al,
3018 &cpumode, chain->nr - first_call);
3020 return (err < 0) ? err : 0;
3022 for (i = first_call, nr_entries = 0;
3023 i < chain_nr && nr_entries < max_stack; i++) {
3026 if (callchain_param.order == ORDER_CALLEE)
3029 j = chain->nr - i - 1;
3031 #ifdef HAVE_SKIP_CALLCHAIN_IDX
3036 if (ip < PERF_CONTEXT_MAX)
3038 else if (callchain_param.order != ORDER_CALLEE) {
3039 err = find_prev_cpumode(chain, thread, cursor, parent,
3040 root_al, &cpumode, j);
3042 return (err < 0) ? err : 0;
3047 * PERF_CONTEXT_USER allows us to locate where the user stack ends.
3048 * Depending on callchain_param.order and the position of PERF_CONTEXT_USER,
3049 * the index will be different in order to add the missing frame
3050 * at the right place.
3053 usr_idx = callchain_param.order == ORDER_CALLEE ? j-2 : j-1;
3055 if (usr_idx >= 0 && chain->ips[usr_idx] == PERF_CONTEXT_USER) {
3057 leaf_frame_caller = get_leaf_frame_caller(sample, thread, usr_idx);
3060 * check if leaf_frame_Caller != ip to not add the same
3064 if (leaf_frame_caller && leaf_frame_caller != ip) {
3066 err = add_callchain_ip(thread, cursor, parent,
3067 root_al, &cpumode, leaf_frame_caller,
3068 false, NULL, NULL, 0);
3070 return (err < 0) ? err : 0;
3074 err = add_callchain_ip(thread, cursor, parent,
3075 root_al, &cpumode, ip,
3076 false, NULL, NULL, 0);
3079 return (err < 0) ? err : 0;
3085 static int append_inlines(struct callchain_cursor *cursor, struct map_symbol *ms, u64 ip)
3087 struct symbol *sym = ms->sym;
3088 struct map *map = ms->map;
3089 struct inline_node *inline_node;
3090 struct inline_list *ilist;
3094 struct map_symbol ilist_ms;
3096 if (!symbol_conf.inline_name || !map || !sym)
3099 addr = map__dso_map_ip(map, ip);
3100 addr = map__rip_2objdump(map, addr);
3101 dso = map__dso(map);
3103 inline_node = inlines__tree_find(&dso->inlined_nodes, addr);
3105 inline_node = dso__parse_addr_inlines(dso, addr, sym);
3108 inlines__tree_insert(&dso->inlined_nodes, inline_node);
3111 ilist_ms = (struct map_symbol) {
3112 .maps = maps__get(ms->maps),
3113 .map = map__get(map),
3115 list_for_each_entry(ilist, &inline_node->val, list) {
3116 ilist_ms.sym = ilist->symbol;
3117 ret = callchain_cursor_append(cursor, ip, &ilist_ms, false,
3118 NULL, 0, 0, 0, ilist->srcline);
3123 map__put(ilist_ms.map);
3124 maps__put(ilist_ms.maps);
3129 static int unwind_entry(struct unwind_entry *entry, void *arg)
3131 struct callchain_cursor *cursor = arg;
3132 const char *srcline = NULL;
3133 u64 addr = entry->ip;
3135 if (symbol_conf.hide_unresolved && entry->ms.sym == NULL)
3138 if (append_inlines(cursor, &entry->ms, entry->ip) == 0)
3142 * Convert entry->ip from a virtual address to an offset in
3143 * its corresponding binary.
3146 addr = map__dso_map_ip(entry->ms.map, entry->ip);
3148 srcline = callchain_srcline(&entry->ms, addr);
3149 return callchain_cursor_append(cursor, entry->ip, &entry->ms,
3150 false, NULL, 0, 0, 0, srcline);
3153 static int thread__resolve_callchain_unwind(struct thread *thread,
3154 struct callchain_cursor *cursor,
3155 struct evsel *evsel,
3156 struct perf_sample *sample,
3159 /* Can we do dwarf post unwind? */
3160 if (!((evsel->core.attr.sample_type & PERF_SAMPLE_REGS_USER) &&
3161 (evsel->core.attr.sample_type & PERF_SAMPLE_STACK_USER)))
3164 /* Bail out if nothing was captured. */
3165 if ((!sample->user_regs.regs) ||
3166 (!sample->user_stack.size))
3169 return unwind__get_entries(unwind_entry, cursor,
3170 thread, sample, max_stack, false);
3173 int thread__resolve_callchain(struct thread *thread,
3174 struct callchain_cursor *cursor,
3175 struct evsel *evsel,
3176 struct perf_sample *sample,
3177 struct symbol **parent,
3178 struct addr_location *root_al,
3186 callchain_cursor_reset(cursor);
3188 if (callchain_param.order == ORDER_CALLEE) {
3189 ret = thread__resolve_callchain_sample(thread, cursor,
3195 ret = thread__resolve_callchain_unwind(thread, cursor,
3199 ret = thread__resolve_callchain_unwind(thread, cursor,
3204 ret = thread__resolve_callchain_sample(thread, cursor,
3213 int machine__for_each_thread(struct machine *machine,
3214 int (*fn)(struct thread *thread, void *p),
3217 struct threads *threads;
3222 for (i = 0; i < THREADS__TABLE_SIZE; i++) {
3223 threads = &machine->threads[i];
3224 for (nd = rb_first_cached(&threads->entries); nd;
3226 struct thread_rb_node *trb = rb_entry(nd, struct thread_rb_node, rb_node);
3228 rc = fn(trb->thread, priv);
3236 int machines__for_each_thread(struct machines *machines,
3237 int (*fn)(struct thread *thread, void *p),
3243 rc = machine__for_each_thread(&machines->host, fn, priv);
3247 for (nd = rb_first_cached(&machines->guests); nd; nd = rb_next(nd)) {
3248 struct machine *machine = rb_entry(nd, struct machine, rb_node);
3250 rc = machine__for_each_thread(machine, fn, priv);
3257 pid_t machine__get_current_tid(struct machine *machine, int cpu)
3259 if (cpu < 0 || (size_t)cpu >= machine->current_tid_sz)
3262 return machine->current_tid[cpu];
3265 int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid,
3268 struct thread *thread;
3269 const pid_t init_val = -1;
3274 if (realloc_array_as_needed(machine->current_tid,
3275 machine->current_tid_sz,
3280 machine->current_tid[cpu] = tid;
3282 thread = machine__findnew_thread(machine, pid, tid);
3286 thread__set_cpu(thread, cpu);
3287 thread__put(thread);
3293 * Compares the raw arch string. N.B. see instead perf_env__arch() or
3294 * machine__normalized_is() if a normalized arch is needed.
3296 bool machine__is(struct machine *machine, const char *arch)
3298 return machine && !strcmp(perf_env__raw_arch(machine->env), arch);
3301 bool machine__normalized_is(struct machine *machine, const char *arch)
3303 return machine && !strcmp(perf_env__arch(machine->env), arch);
3306 int machine__nr_cpus_avail(struct machine *machine)
3308 return machine ? perf_env__nr_cpus_avail(machine->env) : 0;
3311 int machine__get_kernel_start(struct machine *machine)
3313 struct map *map = machine__kernel_map(machine);
3317 * The only addresses above 2^63 are kernel addresses of a 64-bit
3318 * kernel. Note that addresses are unsigned so that on a 32-bit system
3319 * all addresses including kernel addresses are less than 2^32. In
3320 * that case (32-bit system), if the kernel mapping is unknown, all
3321 * addresses will be assumed to be in user space - see
3322 * machine__kernel_ip().
3324 machine->kernel_start = 1ULL << 63;
3326 err = map__load(map);
3328 * On x86_64, PTI entry trampolines are less than the
3329 * start of kernel text, but still above 2^63. So leave
3330 * kernel_start = 1ULL << 63 for x86_64.
3332 if (!err && !machine__is(machine, "x86_64"))
3333 machine->kernel_start = map__start(map);
3338 u8 machine__addr_cpumode(struct machine *machine, u8 cpumode, u64 addr)
3340 u8 addr_cpumode = cpumode;
3343 if (!machine->single_address_space)
3346 kernel_ip = machine__kernel_ip(machine, addr);
3348 case PERF_RECORD_MISC_KERNEL:
3349 case PERF_RECORD_MISC_USER:
3350 addr_cpumode = kernel_ip ? PERF_RECORD_MISC_KERNEL :
3351 PERF_RECORD_MISC_USER;
3353 case PERF_RECORD_MISC_GUEST_KERNEL:
3354 case PERF_RECORD_MISC_GUEST_USER:
3355 addr_cpumode = kernel_ip ? PERF_RECORD_MISC_GUEST_KERNEL :
3356 PERF_RECORD_MISC_GUEST_USER;
3362 return addr_cpumode;
3365 struct dso *machine__findnew_dso_id(struct machine *machine, const char *filename, struct dso_id *id)
3367 return dsos__findnew_id(&machine->dsos, filename, id);
3370 struct dso *machine__findnew_dso(struct machine *machine, const char *filename)
3372 return machine__findnew_dso_id(machine, filename, NULL);
3375 char *machine__resolve_kernel_addr(void *vmachine, unsigned long long *addrp, char **modp)
3377 struct machine *machine = vmachine;
3379 struct symbol *sym = machine__find_kernel_symbol(machine, *addrp, &map);
3384 *modp = __map__is_kmodule(map) ? (char *)map__dso(map)->short_name : NULL;
3385 *addrp = map__unmap_ip(map, sym->start);
3389 int machine__for_each_dso(struct machine *machine, machine__dso_t fn, void *priv)
3394 list_for_each_entry(pos, &machine->dsos.head, node) {
3395 if (fn(pos, machine, priv))
3401 int machine__for_each_kernel_map(struct machine *machine, machine__map_t fn, void *priv)
3403 struct maps *maps = machine__kernel_maps(machine);
3404 struct map_rb_node *pos;
3407 maps__for_each_entry(maps, pos) {
3408 err = fn(pos->map, priv);
3416 bool machine__is_lock_function(struct machine *machine, u64 addr)
3418 if (!machine->sched.text_start) {
3420 struct symbol *sym = machine__find_kernel_symbol_by_name(machine, "__sched_text_start", &kmap);
3423 /* to avoid retry */
3424 machine->sched.text_start = 1;
3428 machine->sched.text_start = map__unmap_ip(kmap, sym->start);
3430 /* should not fail from here */
3431 sym = machine__find_kernel_symbol_by_name(machine, "__sched_text_end", &kmap);
3432 machine->sched.text_end = map__unmap_ip(kmap, sym->start);
3434 sym = machine__find_kernel_symbol_by_name(machine, "__lock_text_start", &kmap);
3435 machine->lock.text_start = map__unmap_ip(kmap, sym->start);
3437 sym = machine__find_kernel_symbol_by_name(machine, "__lock_text_end", &kmap);
3438 machine->lock.text_end = map__unmap_ip(kmap, sym->start);
3441 /* failed to get kernel symbols */
3442 if (machine->sched.text_start == 1)
3445 /* mutex and rwsem functions are in sched text section */
3446 if (machine->sched.text_start <= addr && addr < machine->sched.text_end)
3449 /* spinlock functions are in lock text section */
3450 if (machine->lock.text_start <= addr && addr < machine->lock.text_end)