| #include "callchain.h" |
| #include "debug.h" |
| #include "event.h" |
| #include "evsel.h" |
| #include "hist.h" |
| #include "machine.h" |
| #include "map.h" |
| #include "sort.h" |
| #include "strlist.h" |
| #include "thread.h" |
| #include "vdso.h" |
| #include <stdbool.h> |
| #include <symbol/kallsyms.h> |
| #include "unwind.h" |
| #include "linux/hash.h" |
| |
| static void machine__remove_thread(struct machine *machine, struct thread *th); |
| |
| static void dsos__init(struct dsos *dsos) |
| { |
| INIT_LIST_HEAD(&dsos->head); |
| dsos->root = RB_ROOT; |
| } |
| |
| int machine__init(struct machine *machine, const char *root_dir, pid_t pid) |
| { |
| map_groups__init(&machine->kmaps, machine); |
| RB_CLEAR_NODE(&machine->rb_node); |
| dsos__init(&machine->user_dsos); |
| dsos__init(&machine->kernel_dsos); |
| |
| machine->threads = RB_ROOT; |
| INIT_LIST_HEAD(&machine->dead_threads); |
| machine->last_match = NULL; |
| |
| machine->vdso_info = NULL; |
| |
| machine->pid = pid; |
| |
| machine->symbol_filter = NULL; |
| machine->id_hdr_size = 0; |
| machine->comm_exec = false; |
| machine->kernel_start = 0; |
| |
| machine->root_dir = strdup(root_dir); |
| if (machine->root_dir == NULL) |
| return -ENOMEM; |
| |
| if (pid != HOST_KERNEL_ID) { |
| struct thread *thread = machine__findnew_thread(machine, -1, |
| pid); |
| char comm[64]; |
| |
| if (thread == NULL) |
| return -ENOMEM; |
| |
| snprintf(comm, sizeof(comm), "[guest/%d]", pid); |
| thread__set_comm(thread, comm, 0); |
| } |
| |
| machine->current_tid = NULL; |
| |
| return 0; |
| } |
| |
| struct machine *machine__new_host(void) |
| { |
| struct machine *machine = malloc(sizeof(*machine)); |
| |
| if (machine != NULL) { |
| machine__init(machine, "", HOST_KERNEL_ID); |
| |
| if (machine__create_kernel_maps(machine) < 0) |
| goto out_delete; |
| } |
| |
| return machine; |
| out_delete: |
| free(machine); |
| return NULL; |
| } |
| |
| static void dsos__delete(struct dsos *dsos) |
| { |
| struct dso *pos, *n; |
| |
| list_for_each_entry_safe(pos, n, &dsos->head, node) { |
| RB_CLEAR_NODE(&pos->rb_node); |
| list_del(&pos->node); |
| dso__delete(pos); |
| } |
| } |
| |
| void machine__delete_threads(struct machine *machine) |
| { |
| struct rb_node *nd = rb_first(&machine->threads); |
| |
| while (nd) { |
| struct thread *t = rb_entry(nd, struct thread, rb_node); |
| |
| nd = rb_next(nd); |
| machine__remove_thread(machine, t); |
| } |
| } |
| |
| void machine__exit(struct machine *machine) |
| { |
| map_groups__exit(&machine->kmaps); |
| dsos__delete(&machine->user_dsos); |
| dsos__delete(&machine->kernel_dsos); |
| vdso__exit(machine); |
| zfree(&machine->root_dir); |
| zfree(&machine->current_tid); |
| } |
| |
| void machine__delete(struct machine *machine) |
| { |
| machine__exit(machine); |
| free(machine); |
| } |
| |
| void machines__init(struct machines *machines) |
| { |
| machine__init(&machines->host, "", HOST_KERNEL_ID); |
| machines->guests = RB_ROOT; |
| machines->symbol_filter = NULL; |
| } |
| |
| void machines__exit(struct machines *machines) |
| { |
| machine__exit(&machines->host); |
| /* XXX exit guest */ |
| } |
| |
| struct machine *machines__add(struct machines *machines, pid_t pid, |
| const char *root_dir) |
| { |
| struct rb_node **p = &machines->guests.rb_node; |
| struct rb_node *parent = NULL; |
| struct machine *pos, *machine = malloc(sizeof(*machine)); |
| |
| if (machine == NULL) |
| return NULL; |
| |
| if (machine__init(machine, root_dir, pid) != 0) { |
| free(machine); |
| return NULL; |
| } |
| |
| machine->symbol_filter = machines->symbol_filter; |
| |
| while (*p != NULL) { |
| parent = *p; |
| pos = rb_entry(parent, struct machine, rb_node); |
| if (pid < pos->pid) |
| p = &(*p)->rb_left; |
| else |
| p = &(*p)->rb_right; |
| } |
| |
| rb_link_node(&machine->rb_node, parent, p); |
| rb_insert_color(&machine->rb_node, &machines->guests); |
| |
| return machine; |
| } |
| |
| void machines__set_symbol_filter(struct machines *machines, |
| symbol_filter_t symbol_filter) |
| { |
| struct rb_node *nd; |
| |
| machines->symbol_filter = symbol_filter; |
| machines->host.symbol_filter = symbol_filter; |
| |
| for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) { |
| struct machine *machine = rb_entry(nd, struct machine, rb_node); |
| |
| machine->symbol_filter = symbol_filter; |
| } |
| } |
| |
| void machines__set_comm_exec(struct machines *machines, bool comm_exec) |
| { |
| struct rb_node *nd; |
| |
| machines->host.comm_exec = comm_exec; |
| |
| for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) { |
| struct machine *machine = rb_entry(nd, struct machine, rb_node); |
| |
| machine->comm_exec = comm_exec; |
| } |
| } |
| |
| struct machine *machines__find(struct machines *machines, pid_t pid) |
| { |
| struct rb_node **p = &machines->guests.rb_node; |
| struct rb_node *parent = NULL; |
| struct machine *machine; |
| struct machine *default_machine = NULL; |
| |
| if (pid == HOST_KERNEL_ID) |
| return &machines->host; |
| |
| while (*p != NULL) { |
| parent = *p; |
| machine = rb_entry(parent, struct machine, rb_node); |
| if (pid < machine->pid) |
| p = &(*p)->rb_left; |
| else if (pid > machine->pid) |
| p = &(*p)->rb_right; |
| else |
| return machine; |
| if (!machine->pid) |
| default_machine = machine; |
| } |
| |
| return default_machine; |
| } |
| |
| struct machine *machines__findnew(struct machines *machines, pid_t pid) |
| { |
| char path[PATH_MAX]; |
| const char *root_dir = ""; |
| struct machine *machine = machines__find(machines, pid); |
| |
| if (machine && (machine->pid == pid)) |
| goto out; |
| |
| if ((pid != HOST_KERNEL_ID) && |
| (pid != DEFAULT_GUEST_KERNEL_ID) && |
| (symbol_conf.guestmount)) { |
| sprintf(path, "%s/%d", symbol_conf.guestmount, pid); |
| if (access(path, R_OK)) { |
| static struct strlist *seen; |
| |
| if (!seen) |
| seen = strlist__new(true, NULL); |
| |
| if (!strlist__has_entry(seen, path)) { |
| pr_err("Can't access file %s\n", path); |
| strlist__add(seen, path); |
| } |
| machine = NULL; |
| goto out; |
| } |
| root_dir = path; |
| } |
| |
| machine = machines__add(machines, pid, root_dir); |
| out: |
| return machine; |
| } |
| |
| void machines__process_guests(struct machines *machines, |
| machine__process_t process, void *data) |
| { |
| struct rb_node *nd; |
| |
| for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) { |
| struct machine *pos = rb_entry(nd, struct machine, rb_node); |
| process(pos, data); |
| } |
| } |
| |
| char *machine__mmap_name(struct machine *machine, char *bf, size_t size) |
| { |
| if (machine__is_host(machine)) |
| snprintf(bf, size, "[%s]", "kernel.kallsyms"); |
| else if (machine__is_default_guest(machine)) |
| snprintf(bf, size, "[%s]", "guest.kernel.kallsyms"); |
| else { |
| snprintf(bf, size, "[%s.%d]", "guest.kernel.kallsyms", |
| machine->pid); |
| } |
| |
| return bf; |
| } |
| |
| void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size) |
| { |
| struct rb_node *node; |
| struct machine *machine; |
| |
| machines->host.id_hdr_size = id_hdr_size; |
| |
| for (node = rb_first(&machines->guests); node; node = rb_next(node)) { |
| machine = rb_entry(node, struct machine, rb_node); |
| machine->id_hdr_size = id_hdr_size; |
| } |
| |
| return; |
| } |
| |
| static void machine__update_thread_pid(struct machine *machine, |
| struct thread *th, pid_t pid) |
| { |
| struct thread *leader; |
| |
| if (pid == th->pid_ || pid == -1 || th->pid_ != -1) |
| return; |
| |
| th->pid_ = pid; |
| |
| if (th->pid_ == th->tid) |
| return; |
| |
| leader = machine__findnew_thread(machine, th->pid_, th->pid_); |
| if (!leader) |
| goto out_err; |
| |
| if (!leader->mg) |
| leader->mg = map_groups__new(machine); |
| |
| if (!leader->mg) |
| goto out_err; |
| |
| if (th->mg == leader->mg) |
| return; |
| |
| if (th->mg) { |
| /* |
| * Maps are created from MMAP events which provide the pid and |
| * tid. Consequently there never should be any maps on a thread |
| * with an unknown pid. Just print an error if there are. |
| */ |
| if (!map_groups__empty(th->mg)) |
| pr_err("Discarding thread maps for %d:%d\n", |
| th->pid_, th->tid); |
| map_groups__delete(th->mg); |
| } |
| |
| th->mg = map_groups__get(leader->mg); |
| |
| return; |
| |
| out_err: |
| pr_err("Failed to join map groups for %d:%d\n", th->pid_, th->tid); |
| } |
| |
| static struct thread *__machine__findnew_thread(struct machine *machine, |
| pid_t pid, pid_t tid, |
| bool create) |
| { |
| struct rb_node **p = &machine->threads.rb_node; |
| struct rb_node *parent = NULL; |
| struct thread *th; |
| |
| /* |
| * Front-end cache - TID lookups come in blocks, |
| * so most of the time we dont have to look up |
| * the full rbtree: |
| */ |
| th = machine->last_match; |
| if (th != NULL) { |
| if (th->tid == tid) { |
| machine__update_thread_pid(machine, th, pid); |
| return th; |
| } |
| |
| thread__zput(machine->last_match); |
| } |
| |
| while (*p != NULL) { |
| parent = *p; |
| th = rb_entry(parent, struct thread, rb_node); |
| |
| if (th->tid == tid) { |
| machine->last_match = thread__get(th); |
| machine__update_thread_pid(machine, th, pid); |
| return th; |
| } |
| |
| if (tid < th->tid) |
| p = &(*p)->rb_left; |
| else |
| p = &(*p)->rb_right; |
| } |
| |
| if (!create) |
| return NULL; |
| |
| th = thread__new(pid, tid); |
| if (th != NULL) { |
| rb_link_node(&th->rb_node, parent, p); |
| rb_insert_color(&th->rb_node, &machine->threads); |
| |
| /* |
| * We have to initialize map_groups separately |
| * after rb tree is updated. |
| * |
| * The reason is that we call machine__findnew_thread |
| * within thread__init_map_groups to find the thread |
| * leader and that would screwed the rb tree. |
| */ |
| if (thread__init_map_groups(th, machine)) { |
| rb_erase(&th->rb_node, &machine->threads); |
| thread__delete(th); |
| return NULL; |
| } |
| /* |
| * It is now in the rbtree, get a ref |
| */ |
| thread__get(th); |
| machine->last_match = thread__get(th); |
| } |
| |
| return th; |
| } |
| |
| struct thread *machine__findnew_thread(struct machine *machine, pid_t pid, |
| pid_t tid) |
| { |
| return __machine__findnew_thread(machine, pid, tid, true); |
| } |
| |
| struct thread *machine__find_thread(struct machine *machine, pid_t pid, |
| pid_t tid) |
| { |
| return __machine__findnew_thread(machine, pid, tid, false); |
| } |
| |
| struct comm *machine__thread_exec_comm(struct machine *machine, |
| struct thread *thread) |
| { |
| if (machine->comm_exec) |
| return thread__exec_comm(thread); |
| else |
| return thread__comm(thread); |
| } |
| |
| int machine__process_comm_event(struct machine *machine, union perf_event *event, |
| struct perf_sample *sample) |
| { |
| struct thread *thread = machine__findnew_thread(machine, |
| event->comm.pid, |
| event->comm.tid); |
| bool exec = event->header.misc & PERF_RECORD_MISC_COMM_EXEC; |
| |
| if (exec) |
| machine->comm_exec = true; |
| |
| if (dump_trace) |
| perf_event__fprintf_comm(event, stdout); |
| |
| if (thread == NULL || |
| __thread__set_comm(thread, event->comm.comm, sample->time, exec)) { |
| dump_printf("problem processing PERF_RECORD_COMM, skipping event.\n"); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| int machine__process_lost_event(struct machine *machine __maybe_unused, |
| union perf_event *event, struct perf_sample *sample __maybe_unused) |
| { |
| dump_printf(": id:%" PRIu64 ": lost:%" PRIu64 "\n", |
| event->lost.id, event->lost.lost); |
| return 0; |
| } |
| |
| static struct dso* |
| machine__module_dso(struct machine *machine, struct kmod_path *m, |
| const char *filename) |
| { |
| struct dso *dso; |
| |
| dso = dsos__find(&machine->kernel_dsos, m->name, true); |
| if (!dso) { |
| dso = dsos__addnew(&machine->kernel_dsos, m->name); |
| if (dso == NULL) |
| return NULL; |
| |
| if (machine__is_host(machine)) |
| dso->symtab_type = DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE; |
| else |
| dso->symtab_type = DSO_BINARY_TYPE__GUEST_KMODULE; |
| |
| /* _KMODULE_COMP should be next to _KMODULE */ |
| if (m->kmod && m->comp) |
| dso->symtab_type++; |
| |
| dso__set_short_name(dso, strdup(m->name), true); |
| dso__set_long_name(dso, strdup(filename), true); |
| } |
| |
| return dso; |
| } |
| |
| struct map *machine__new_module(struct machine *machine, u64 start, |
| const char *filename) |
| { |
| struct map *map = NULL; |
| struct dso *dso; |
| struct kmod_path m; |
| |
| if (kmod_path__parse_name(&m, filename)) |
| return NULL; |
| |
| dso = machine__module_dso(machine, &m, filename); |
| if (dso == NULL) |
| goto out; |
| |
| map = map__new2(start, dso, MAP__FUNCTION); |
| if (map == NULL) |
| goto out; |
| |
| map_groups__insert(&machine->kmaps, map); |
| |
| out: |
| free(m.name); |
| return map; |
| } |
| |
| size_t machines__fprintf_dsos(struct machines *machines, FILE *fp) |
| { |
| struct rb_node *nd; |
| size_t ret = __dsos__fprintf(&machines->host.kernel_dsos.head, fp) + |
| __dsos__fprintf(&machines->host.user_dsos.head, fp); |
| |
| for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) { |
| struct machine *pos = rb_entry(nd, struct machine, rb_node); |
| ret += __dsos__fprintf(&pos->kernel_dsos.head, fp); |
| ret += __dsos__fprintf(&pos->user_dsos.head, fp); |
| } |
| |
| return ret; |
| } |
| |
| size_t machine__fprintf_dsos_buildid(struct machine *m, FILE *fp, |
| bool (skip)(struct dso *dso, int parm), int parm) |
| { |
| return __dsos__fprintf_buildid(&m->kernel_dsos.head, fp, skip, parm) + |
| __dsos__fprintf_buildid(&m->user_dsos.head, fp, skip, parm); |
| } |
| |
| size_t machines__fprintf_dsos_buildid(struct machines *machines, FILE *fp, |
| bool (skip)(struct dso *dso, int parm), int parm) |
| { |
| struct rb_node *nd; |
| size_t ret = machine__fprintf_dsos_buildid(&machines->host, fp, skip, parm); |
| |
| for (nd = rb_first(&machines->guests); nd; nd = rb_next(nd)) { |
| struct machine *pos = rb_entry(nd, struct machine, rb_node); |
| ret += machine__fprintf_dsos_buildid(pos, fp, skip, parm); |
| } |
| return ret; |
| } |
| |
| size_t machine__fprintf_vmlinux_path(struct machine *machine, FILE *fp) |
| { |
| int i; |
| size_t printed = 0; |
| struct dso *kdso = machine->vmlinux_maps[MAP__FUNCTION]->dso; |
| |
| if (kdso->has_build_id) { |
| char filename[PATH_MAX]; |
| if (dso__build_id_filename(kdso, filename, sizeof(filename))) |
| printed += fprintf(fp, "[0] %s\n", filename); |
| } |
| |
| for (i = 0; i < vmlinux_path__nr_entries; ++i) |
| printed += fprintf(fp, "[%d] %s\n", |
| i + kdso->has_build_id, vmlinux_path[i]); |
| |
| return printed; |
| } |
| |
| size_t machine__fprintf(struct machine *machine, FILE *fp) |
| { |
| size_t ret = 0; |
| struct rb_node *nd; |
| |
| for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) { |
| struct thread *pos = rb_entry(nd, struct thread, rb_node); |
| |
| ret += thread__fprintf(pos, fp); |
| } |
| |
| return ret; |
| } |
| |
| static struct dso *machine__get_kernel(struct machine *machine) |
| { |
| const char *vmlinux_name = NULL; |
| struct dso *kernel; |
| |
| if (machine__is_host(machine)) { |
| vmlinux_name = symbol_conf.vmlinux_name; |
| if (!vmlinux_name) |
| vmlinux_name = "[kernel.kallsyms]"; |
| |
| kernel = dso__kernel_findnew(machine, vmlinux_name, |
| "[kernel]", |
| DSO_TYPE_KERNEL); |
| } else { |
| char bf[PATH_MAX]; |
| |
| if (machine__is_default_guest(machine)) |
| vmlinux_name = symbol_conf.default_guest_vmlinux_name; |
| if (!vmlinux_name) |
| vmlinux_name = machine__mmap_name(machine, bf, |
| sizeof(bf)); |
| |
| kernel = dso__kernel_findnew(machine, vmlinux_name, |
| "[guest.kernel]", |
| DSO_TYPE_GUEST_KERNEL); |
| } |
| |
| if (kernel != NULL && (!kernel->has_build_id)) |
| dso__read_running_kernel_build_id(kernel, machine); |
| |
| return kernel; |
| } |
| |
| struct process_args { |
| u64 start; |
| }; |
| |
| static void machine__get_kallsyms_filename(struct machine *machine, char *buf, |
| size_t bufsz) |
| { |
| if (machine__is_default_guest(machine)) |
| scnprintf(buf, bufsz, "%s", symbol_conf.default_guest_kallsyms); |
| else |
| scnprintf(buf, bufsz, "%s/proc/kallsyms", machine->root_dir); |
| } |
| |
| const char *ref_reloc_sym_names[] = {"_text", "_stext", NULL}; |
| |
| /* Figure out the start address of kernel map from /proc/kallsyms. |
| * Returns the name of the start symbol in *symbol_name. Pass in NULL as |
| * symbol_name if it's not that important. |
| */ |
| static u64 machine__get_running_kernel_start(struct machine *machine, |
| const char **symbol_name) |
| { |
| char filename[PATH_MAX]; |
| int i; |
| const char *name; |
| u64 addr = 0; |
| |
| machine__get_kallsyms_filename(machine, filename, PATH_MAX); |
| |
| if (symbol__restricted_filename(filename, "/proc/kallsyms")) |
| return 0; |
| |
| for (i = 0; (name = ref_reloc_sym_names[i]) != NULL; i++) { |
| addr = kallsyms__get_function_start(filename, name); |
| if (addr) |
| break; |
| } |
| |
| if (symbol_name) |
| *symbol_name = name; |
| |
| return addr; |
| } |
| |
| int __machine__create_kernel_maps(struct machine *machine, struct dso *kernel) |
| { |
| enum map_type type; |
| u64 start = machine__get_running_kernel_start(machine, NULL); |
| |
| for (type = 0; type < MAP__NR_TYPES; ++type) { |
| struct kmap *kmap; |
| |
| machine->vmlinux_maps[type] = map__new2(start, kernel, type); |
| if (machine->vmlinux_maps[type] == NULL) |
| return -1; |
| |
| machine->vmlinux_maps[type]->map_ip = |
| machine->vmlinux_maps[type]->unmap_ip = |
| identity__map_ip; |
| kmap = map__kmap(machine->vmlinux_maps[type]); |
| kmap->kmaps = &machine->kmaps; |
| map_groups__insert(&machine->kmaps, |
| machine->vmlinux_maps[type]); |
| } |
| |
| return 0; |
| } |
| |
| void machine__destroy_kernel_maps(struct machine *machine) |
| { |
| enum map_type type; |
| |
| for (type = 0; type < MAP__NR_TYPES; ++type) { |
| struct kmap *kmap; |
| |
| if (machine->vmlinux_maps[type] == NULL) |
| continue; |
| |
| kmap = map__kmap(machine->vmlinux_maps[type]); |
| map_groups__remove(&machine->kmaps, |
| machine->vmlinux_maps[type]); |
| if (kmap->ref_reloc_sym) { |
| /* |
| * ref_reloc_sym is shared among all maps, so free just |
| * on one of them. |
| */ |
| if (type == MAP__FUNCTION) { |
| zfree((char **)&kmap->ref_reloc_sym->name); |
| zfree(&kmap->ref_reloc_sym); |
| } else |
| kmap->ref_reloc_sym = NULL; |
| } |
| |
| map__delete(machine->vmlinux_maps[type]); |
| machine->vmlinux_maps[type] = NULL; |
| } |
| } |
| |
| int machines__create_guest_kernel_maps(struct machines *machines) |
| { |
| int ret = 0; |
| struct dirent **namelist = NULL; |
| int i, items = 0; |
| char path[PATH_MAX]; |
| pid_t pid; |
| char *endp; |
| |
| if (symbol_conf.default_guest_vmlinux_name || |
| symbol_conf.default_guest_modules || |
| symbol_conf.default_guest_kallsyms) { |
| machines__create_kernel_maps(machines, DEFAULT_GUEST_KERNEL_ID); |
| } |
| |
| if (symbol_conf.guestmount) { |
| items = scandir(symbol_conf.guestmount, &namelist, NULL, NULL); |
| if (items <= 0) |
| return -ENOENT; |
| for (i = 0; i < items; i++) { |
| if (!isdigit(namelist[i]->d_name[0])) { |
| /* Filter out . and .. */ |
| continue; |
| } |
| pid = (pid_t)strtol(namelist[i]->d_name, &endp, 10); |
| if ((*endp != '\0') || |
| (endp == namelist[i]->d_name) || |
| (errno == ERANGE)) { |
| pr_debug("invalid directory (%s). Skipping.\n", |
| namelist[i]->d_name); |
| continue; |
| } |
| sprintf(path, "%s/%s/proc/kallsyms", |
| symbol_conf.guestmount, |
| namelist[i]->d_name); |
| ret = access(path, R_OK); |
| if (ret) { |
| pr_debug("Can't access file %s\n", path); |
| goto failure; |
| } |
| machines__create_kernel_maps(machines, pid); |
| } |
| failure: |
| free(namelist); |
| } |
| |
| return ret; |
| } |
| |
| void machines__destroy_kernel_maps(struct machines *machines) |
| { |
| struct rb_node *next = rb_first(&machines->guests); |
| |
| machine__destroy_kernel_maps(&machines->host); |
| |
| while (next) { |
| struct machine *pos = rb_entry(next, struct machine, rb_node); |
| |
| next = rb_next(&pos->rb_node); |
| rb_erase(&pos->rb_node, &machines->guests); |
| machine__delete(pos); |
| } |
| } |
| |
| int machines__create_kernel_maps(struct machines *machines, pid_t pid) |
| { |
| struct machine *machine = machines__findnew(machines, pid); |
| |
| if (machine == NULL) |
| return -1; |
| |
| return machine__create_kernel_maps(machine); |
| } |
| |
| int machine__load_kallsyms(struct machine *machine, const char *filename, |
| enum map_type type, symbol_filter_t filter) |
| { |
| struct map *map = machine->vmlinux_maps[type]; |
| int ret = dso__load_kallsyms(map->dso, filename, map, filter); |
| |
| if (ret > 0) { |
| dso__set_loaded(map->dso, type); |
| /* |
| * Since /proc/kallsyms will have multiple sessions for the |
| * kernel, with modules between them, fixup the end of all |
| * sections. |
| */ |
| __map_groups__fixup_end(&machine->kmaps, type); |
| } |
| |
| return ret; |
| } |
| |
| int machine__load_vmlinux_path(struct machine *machine, enum map_type type, |
| symbol_filter_t filter) |
| { |
| struct map *map = machine->vmlinux_maps[type]; |
| int ret = dso__load_vmlinux_path(map->dso, map, filter); |
| |
| if (ret > 0) |
| dso__set_loaded(map->dso, type); |
| |
| return ret; |
| } |
| |
| static void map_groups__fixup_end(struct map_groups *mg) |
| { |
| int i; |
| for (i = 0; i < MAP__NR_TYPES; ++i) |
| __map_groups__fixup_end(mg, i); |
| } |
| |
| static char *get_kernel_version(const char *root_dir) |
| { |
| char version[PATH_MAX]; |
| FILE *file; |
| char *name, *tmp; |
| const char *prefix = "Linux version "; |
| |
| sprintf(version, "%s/proc/version", root_dir); |
| file = fopen(version, "r"); |
| if (!file) |
| return NULL; |
| |
| version[0] = '\0'; |
| tmp = fgets(version, sizeof(version), file); |
| fclose(file); |
| |
| name = strstr(version, prefix); |
| if (!name) |
| return NULL; |
| name += strlen(prefix); |
| tmp = strchr(name, ' '); |
| if (tmp) |
| *tmp = '\0'; |
| |
| return strdup(name); |
| } |
| |
| static bool is_kmod_dso(struct dso *dso) |
| { |
| return dso->symtab_type == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE || |
| dso->symtab_type == DSO_BINARY_TYPE__GUEST_KMODULE; |
| } |
| |
| static int map_groups__set_module_path(struct map_groups *mg, const char *path, |
| struct kmod_path *m) |
| { |
| struct map *map; |
| char *long_name; |
| |
| map = map_groups__find_by_name(mg, MAP__FUNCTION, m->name); |
| if (map == NULL) |
| return 0; |
| |
| long_name = strdup(path); |
| if (long_name == NULL) |
| return -ENOMEM; |
| |
| dso__set_long_name(map->dso, long_name, true); |
| dso__kernel_module_get_build_id(map->dso, ""); |
| |
| /* |
| * Full name could reveal us kmod compression, so |
| * we need to update the symtab_type if needed. |
| */ |
| if (m->comp && is_kmod_dso(map->dso)) |
| map->dso->symtab_type++; |
| |
| return 0; |
| } |
| |
| static int map_groups__set_modules_path_dir(struct map_groups *mg, |
| const char *dir_name, int depth) |
| { |
| struct dirent *dent; |
| DIR *dir = opendir(dir_name); |
| int ret = 0; |
| |
| if (!dir) { |
| pr_debug("%s: cannot open %s dir\n", __func__, dir_name); |
| return -1; |
| } |
| |
| while ((dent = readdir(dir)) != NULL) { |
| char path[PATH_MAX]; |
| struct stat st; |
| |
| /*sshfs might return bad dent->d_type, so we have to stat*/ |
| snprintf(path, sizeof(path), "%s/%s", dir_name, dent->d_name); |
| if (stat(path, &st)) |
| continue; |
| |
| if (S_ISDIR(st.st_mode)) { |
| if (!strcmp(dent->d_name, ".") || |
| !strcmp(dent->d_name, "..")) |
| continue; |
| |
| /* Do not follow top-level source and build symlinks */ |
| if (depth == 0) { |
| if (!strcmp(dent->d_name, "source") || |
| !strcmp(dent->d_name, "build")) |
| continue; |
| } |
| |
| ret = map_groups__set_modules_path_dir(mg, path, |
| depth + 1); |
| if (ret < 0) |
| goto out; |
| } else { |
| struct kmod_path m; |
| |
| ret = kmod_path__parse_name(&m, dent->d_name); |
| if (ret) |
| goto out; |
| |
| if (m.kmod) |
| ret = map_groups__set_module_path(mg, path, &m); |
| |
| free(m.name); |
| |
| if (ret) |
| goto out; |
| } |
| } |
| |
| out: |
| closedir(dir); |
| return ret; |
| } |
| |
| static int machine__set_modules_path(struct machine *machine) |
| { |
| char *version; |
| char modules_path[PATH_MAX]; |
| |
| version = get_kernel_version(machine->root_dir); |
| if (!version) |
| return -1; |
| |
| snprintf(modules_path, sizeof(modules_path), "%s/lib/modules/%s", |
| machine->root_dir, version); |
| free(version); |
| |
| return map_groups__set_modules_path_dir(&machine->kmaps, modules_path, 0); |
| } |
| |
| static int machine__create_module(void *arg, const char *name, u64 start) |
| { |
| struct machine *machine = arg; |
| struct map *map; |
| |
| map = machine__new_module(machine, start, name); |
| if (map == NULL) |
| return -1; |
| |
| dso__kernel_module_get_build_id(map->dso, machine->root_dir); |
| |
| return 0; |
| } |
| |
| static int machine__create_modules(struct machine *machine) |
| { |
| const char *modules; |
| char path[PATH_MAX]; |
| |
| if (machine__is_default_guest(machine)) { |
| modules = symbol_conf.default_guest_modules; |
| } else { |
| snprintf(path, PATH_MAX, "%s/proc/modules", machine->root_dir); |
| modules = path; |
| } |
| |
| if (symbol__restricted_filename(modules, "/proc/modules")) |
| return -1; |
| |
| if (modules__parse(modules, machine, machine__create_module)) |
| return -1; |
| |
| if (!machine__set_modules_path(machine)) |
| return 0; |
| |
| pr_debug("Problems setting modules path maps, continuing anyway...\n"); |
| |
| return 0; |
| } |
| |
| int machine__create_kernel_maps(struct machine *machine) |
| { |
| struct dso *kernel = machine__get_kernel(machine); |
| const char *name; |
| u64 addr = machine__get_running_kernel_start(machine, &name); |
| if (!addr) |
| return -1; |
| |
| if (kernel == NULL || |
| __machine__create_kernel_maps(machine, kernel) < 0) |
| return -1; |
| |
| if (symbol_conf.use_modules && machine__create_modules(machine) < 0) { |
| if (machine__is_host(machine)) |
| pr_debug("Problems creating module maps, " |
| "continuing anyway...\n"); |
| else |
| pr_debug("Problems creating module maps for guest %d, " |
| "continuing anyway...\n", machine->pid); |
| } |
| |
| /* |
| * Now that we have all the maps created, just set the ->end of them: |
| */ |
| map_groups__fixup_end(&machine->kmaps); |
| |
| if (maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, name, |
| addr)) { |
| machine__destroy_kernel_maps(machine); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static void machine__set_kernel_mmap_len(struct machine *machine, |
| union perf_event *event) |
| { |
| int i; |
| |
| for (i = 0; i < MAP__NR_TYPES; i++) { |
| machine->vmlinux_maps[i]->start = event->mmap.start; |
| machine->vmlinux_maps[i]->end = (event->mmap.start + |
| event->mmap.len); |
| /* |
| * Be a bit paranoid here, some perf.data file came with |
| * a zero sized synthesized MMAP event for the kernel. |
| */ |
| if (machine->vmlinux_maps[i]->end == 0) |
| machine->vmlinux_maps[i]->end = ~0ULL; |
| } |
| } |
| |
| static bool machine__uses_kcore(struct machine *machine) |
| { |
| struct dso *dso; |
| |
| list_for_each_entry(dso, &machine->kernel_dsos.head, node) { |
| if (dso__is_kcore(dso)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static int machine__process_kernel_mmap_event(struct machine *machine, |
| union perf_event *event) |
| { |
| struct map *map; |
| char kmmap_prefix[PATH_MAX]; |
| enum dso_kernel_type kernel_type; |
| bool is_kernel_mmap; |
| |
| /* If we have maps from kcore then we do not need or want any others */ |
| if (machine__uses_kcore(machine)) |
| return 0; |
| |
| machine__mmap_name(machine, kmmap_prefix, sizeof(kmmap_prefix)); |
| if (machine__is_host(machine)) |
| kernel_type = DSO_TYPE_KERNEL; |
| else |
| kernel_type = DSO_TYPE_GUEST_KERNEL; |
| |
| is_kernel_mmap = memcmp(event->mmap.filename, |
| kmmap_prefix, |
| strlen(kmmap_prefix) - 1) == 0; |
| if (event->mmap.filename[0] == '/' || |
| (!is_kernel_mmap && event->mmap.filename[0] == '[')) { |
| map = machine__new_module(machine, event->mmap.start, |
| event->mmap.filename); |
| if (map == NULL) |
| goto out_problem; |
| |
| map->end = map->start + event->mmap.len; |
| } else if (is_kernel_mmap) { |
| const char *symbol_name = (event->mmap.filename + |
| strlen(kmmap_prefix)); |
| /* |
| * Should be there already, from the build-id table in |
| * the header. |
| */ |
| struct dso *kernel = NULL; |
| struct dso *dso; |
| |
| list_for_each_entry(dso, &machine->kernel_dsos.head, node) { |
| if (is_kernel_module(dso->long_name, NULL)) |
| continue; |
| |
| kernel = dso; |
| break; |
| } |
| |
| if (kernel == NULL) |
| kernel = __dsos__findnew(&machine->kernel_dsos, |
| kmmap_prefix); |
| if (kernel == NULL) |
| goto out_problem; |
| |
| kernel->kernel = kernel_type; |
| if (__machine__create_kernel_maps(machine, kernel) < 0) |
| goto out_problem; |
| |
| if (strstr(kernel->long_name, "vmlinux")) |
| dso__set_short_name(kernel, "[kernel.vmlinux]", false); |
| |
| machine__set_kernel_mmap_len(machine, event); |
| |
| /* |
| * Avoid using a zero address (kptr_restrict) for the ref reloc |
| * symbol. Effectively having zero here means that at record |
| * time /proc/sys/kernel/kptr_restrict was non zero. |
| */ |
| if (event->mmap.pgoff != 0) { |
| maps__set_kallsyms_ref_reloc_sym(machine->vmlinux_maps, |
| symbol_name, |
| event->mmap.pgoff); |
| } |
| |
| if (machine__is_default_guest(machine)) { |
| /* |
| * preload dso of guest kernel and modules |
| */ |
| dso__load(kernel, machine->vmlinux_maps[MAP__FUNCTION], |
| NULL); |
| } |
| } |
| return 0; |
| out_problem: |
| return -1; |
| } |
| |
| int machine__process_mmap2_event(struct machine *machine, |
| union perf_event *event, |
| struct perf_sample *sample __maybe_unused) |
| { |
| u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; |
| struct thread *thread; |
| struct map *map; |
| enum map_type type; |
| int ret = 0; |
| |
| if (dump_trace) |
| perf_event__fprintf_mmap2(event, stdout); |
| |
| if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL || |
| cpumode == PERF_RECORD_MISC_KERNEL) { |
| ret = machine__process_kernel_mmap_event(machine, event); |
| if (ret < 0) |
| goto out_problem; |
| return 0; |
| } |
| |
| thread = machine__findnew_thread(machine, event->mmap2.pid, |
| event->mmap2.tid); |
| if (thread == NULL) |
| goto out_problem; |
| |
| if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) |
| type = MAP__VARIABLE; |
| else |
| type = MAP__FUNCTION; |
| |
| map = map__new(machine, event->mmap2.start, |
| event->mmap2.len, event->mmap2.pgoff, |
| event->mmap2.pid, event->mmap2.maj, |
| event->mmap2.min, event->mmap2.ino, |
| event->mmap2.ino_generation, |
| event->mmap2.prot, |
| event->mmap2.flags, |
| event->mmap2.filename, type, thread); |
| |
| if (map == NULL) |
| goto out_problem; |
| |
| thread__insert_map(thread, map); |
| return 0; |
| |
| out_problem: |
| dump_printf("problem processing PERF_RECORD_MMAP2, skipping event.\n"); |
| return 0; |
| } |
| |
| int machine__process_mmap_event(struct machine *machine, union perf_event *event, |
| struct perf_sample *sample __maybe_unused) |
| { |
| u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK; |
| struct thread *thread; |
| struct map *map; |
| enum map_type type; |
| int ret = 0; |
| |
| if (dump_trace) |
| perf_event__fprintf_mmap(event, stdout); |
| |
| if (cpumode == PERF_RECORD_MISC_GUEST_KERNEL || |
| cpumode == PERF_RECORD_MISC_KERNEL) { |
| ret = machine__process_kernel_mmap_event(machine, event); |
| if (ret < 0) |
| goto out_problem; |
| return 0; |
| } |
| |
| thread = machine__findnew_thread(machine, event->mmap.pid, |
| event->mmap.tid); |
| if (thread == NULL) |
| goto out_problem; |
| |
| if (event->header.misc & PERF_RECORD_MISC_MMAP_DATA) |
| type = MAP__VARIABLE; |
| else |
| type = MAP__FUNCTION; |
| |
| map = map__new(machine, event->mmap.start, |
| event->mmap.len, event->mmap.pgoff, |
| event->mmap.pid, 0, 0, 0, 0, 0, 0, |
| event->mmap.filename, |
| type, thread); |
| |
| if (map == NULL) |
| goto out_problem; |
| |
| thread__insert_map(thread, map); |
| return 0; |
| |
| out_problem: |
| dump_printf("problem processing PERF_RECORD_MMAP, skipping event.\n"); |
| return 0; |
| } |
| |
| static void machine__remove_thread(struct machine *machine, struct thread *th) |
| { |
| if (machine->last_match == th) |
| thread__zput(machine->last_match); |
| |
| rb_erase(&th->rb_node, &machine->threads); |
| /* |
| * Move it first to the dead_threads list, then drop the reference, |
| * if this is the last reference, then the thread__delete destructor |
| * will be called and we will remove it from the dead_threads list. |
| */ |
| list_add_tail(&th->node, &machine->dead_threads); |
| thread__put(th); |
| } |
| |
| int machine__process_fork_event(struct machine *machine, union perf_event *event, |
| struct perf_sample *sample) |
| { |
| struct thread *thread = machine__find_thread(machine, |
| event->fork.pid, |
| event->fork.tid); |
| struct thread *parent = machine__findnew_thread(machine, |
| event->fork.ppid, |
| event->fork.ptid); |
| |
| /* if a thread currently exists for the thread id remove it */ |
| if (thread != NULL) |
| machine__remove_thread(machine, thread); |
| |
| thread = machine__findnew_thread(machine, event->fork.pid, |
| event->fork.tid); |
| if (dump_trace) |
| perf_event__fprintf_task(event, stdout); |
| |
| if (thread == NULL || parent == NULL || |
| thread__fork(thread, parent, sample->time) < 0) { |
| dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n"); |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| int machine__process_exit_event(struct machine *machine, union perf_event *event, |
| struct perf_sample *sample __maybe_unused) |
| { |
| struct thread *thread = machine__find_thread(machine, |
| event->fork.pid, |
| event->fork.tid); |
| |
| if (dump_trace) |
| perf_event__fprintf_task(event, stdout); |
| |
| if (thread != NULL) |
| thread__exited(thread); |
| |
| return 0; |
| } |
| |
| int machine__process_event(struct machine *machine, union perf_event *event, |
| struct perf_sample *sample) |
| { |
| int ret; |
| |
| switch (event->header.type) { |
| case PERF_RECORD_COMM: |
| ret = machine__process_comm_event(machine, event, sample); break; |
| case PERF_RECORD_MMAP: |
| ret = machine__process_mmap_event(machine, event, sample); break; |
| case PERF_RECORD_MMAP2: |
| ret = machine__process_mmap2_event(machine, event, sample); break; |
| case PERF_RECORD_FORK: |
| ret = machine__process_fork_event(machine, event, sample); break; |
| case PERF_RECORD_EXIT: |
| ret = machine__process_exit_event(machine, event, sample); break; |
| case PERF_RECORD_LOST: |
| ret = machine__process_lost_event(machine, event, sample); break; |
| default: |
| ret = -1; |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static bool symbol__match_regex(struct symbol *sym, regex_t *regex) |
| { |
| if (sym->name && !regexec(regex, sym->name, 0, NULL, 0)) |
| return 1; |
| return 0; |
| } |
| |
| static void ip__resolve_ams(struct thread *thread, |
| struct addr_map_symbol *ams, |
| u64 ip) |
| { |
| struct addr_location al; |
| |
| memset(&al, 0, sizeof(al)); |
| /* |
| * We cannot use the header.misc hint to determine whether a |
| * branch stack address is user, kernel, guest, hypervisor. |
| * Branches may straddle the kernel/user/hypervisor boundaries. |
| * Thus, we have to try consecutively until we find a match |
| * or else, the symbol is unknown |
| */ |
| thread__find_cpumode_addr_location(thread, MAP__FUNCTION, ip, &al); |
| |
| ams->addr = ip; |
| ams->al_addr = al.addr; |
| ams->sym = al.sym; |
| ams->map = al.map; |
| } |
| |
| static void ip__resolve_data(struct thread *thread, |
| u8 m, struct addr_map_symbol *ams, u64 addr) |
| { |
| struct addr_location al; |
| |
| memset(&al, 0, sizeof(al)); |
| |
| thread__find_addr_location(thread, m, MAP__VARIABLE, addr, &al); |
| if (al.map == NULL) { |
| /* |
| * some shared data regions have execute bit set which puts |
| * their mapping in the MAP__FUNCTION type array. |
| * Check there as a fallback option before dropping the sample. |
| */ |
| thread__find_addr_location(thread, m, MAP__FUNCTION, addr, &al); |
| } |
| |
| ams->addr = addr; |
| ams->al_addr = al.addr; |
| ams->sym = al.sym; |
| ams->map = al.map; |
| } |
| |
| struct mem_info *sample__resolve_mem(struct perf_sample *sample, |
| struct addr_location *al) |
| { |
| struct mem_info *mi = zalloc(sizeof(*mi)); |
| |
| if (!mi) |
| return NULL; |
| |
| ip__resolve_ams(al->thread, &mi->iaddr, sample->ip); |
| ip__resolve_data(al->thread, al->cpumode, &mi->daddr, sample->addr); |
| mi->data_src.val = sample->data_src; |
| |
| return mi; |
| } |
| |
| static int add_callchain_ip(struct thread *thread, |
| struct symbol **parent, |
| struct addr_location *root_al, |
| bool branch_history, |
| u64 ip) |
| { |
| struct addr_location al; |
| |
| al.filtered = 0; |
| al.sym = NULL; |
| if (branch_history) |
| thread__find_cpumode_addr_location(thread, MAP__FUNCTION, |
| ip, &al); |
| else { |
| u8 cpumode = PERF_RECORD_MISC_USER; |
| |
| if (ip >= PERF_CONTEXT_MAX) { |
| switch (ip) { |
| case PERF_CONTEXT_HV: |
| cpumode = PERF_RECORD_MISC_HYPERVISOR; |
| break; |
| case PERF_CONTEXT_KERNEL: |
| cpumode = PERF_RECORD_MISC_KERNEL; |
| break; |
| case PERF_CONTEXT_USER: |
| cpumode = PERF_RECORD_MISC_USER; |
| break; |
| default: |
| pr_debug("invalid callchain context: " |
| "%"PRId64"\n", (s64) ip); |
| /* |
| * It seems the callchain is corrupted. |
| * Discard all. |
| */ |
| callchain_cursor_reset(&callchain_cursor); |
| return 1; |
| } |
| return 0; |
| } |
| thread__find_addr_location(thread, cpumode, MAP__FUNCTION, |
| ip, &al); |
| } |
| |
| if (al.sym != NULL) { |
| if (sort__has_parent && !*parent && |
| symbol__match_regex(al.sym, &parent_regex)) |
| *parent = al.sym; |
| else if (have_ignore_callees && root_al && |
| symbol__match_regex(al.sym, &ignore_callees_regex)) { |
| /* Treat this symbol as the root, |
| forgetting its callees. */ |
| *root_al = al; |
| callchain_cursor_reset(&callchain_cursor); |
| } |
| } |
| |
| return callchain_cursor_append(&callchain_cursor, al.addr, al.map, al.sym); |
| } |
| |
| struct branch_info *sample__resolve_bstack(struct perf_sample *sample, |
| struct addr_location *al) |
| { |
| unsigned int i; |
| const struct branch_stack *bs = sample->branch_stack; |
| struct branch_info *bi = calloc(bs->nr, sizeof(struct branch_info)); |
| |
| if (!bi) |
| return NULL; |
| |
| for (i = 0; i < bs->nr; i++) { |
| ip__resolve_ams(al->thread, &bi[i].to, bs->entries[i].to); |
| ip__resolve_ams(al->thread, &bi[i].from, bs->entries[i].from); |
| bi[i].flags = bs->entries[i].flags; |
| } |
| return bi; |
| } |
| |
| #define CHASHSZ 127 |
| #define CHASHBITS 7 |
| #define NO_ENTRY 0xff |
| |
| #define PERF_MAX_BRANCH_DEPTH 127 |
| |
| /* Remove loops. */ |
| static int remove_loops(struct branch_entry *l, int nr) |
| { |
| int i, j, off; |
| unsigned char chash[CHASHSZ]; |
| |
| memset(chash, NO_ENTRY, sizeof(chash)); |
| |
| BUG_ON(PERF_MAX_BRANCH_DEPTH > 255); |
| |
| for (i = 0; i < nr; i++) { |
| int h = hash_64(l[i].from, CHASHBITS) % CHASHSZ; |
| |
| /* no collision handling for now */ |
| if (chash[h] == NO_ENTRY) { |
| chash[h] = i; |
| } else if (l[chash[h]].from == l[i].from) { |
| bool is_loop = true; |
| /* check if it is a real loop */ |
| off = 0; |
| for (j = chash[h]; j < i && i + off < nr; j++, off++) |
| if (l[j].from != l[i + off].from) { |
| is_loop = false; |
| break; |
| } |
| if (is_loop) { |
| memmove(l + i, l + i + off, |
| (nr - (i + off)) * sizeof(*l)); |
| nr -= off; |
| } |
| } |
| } |
| return nr; |
| } |
| |
| /* |
| * Recolve LBR callstack chain sample |
| * Return: |
| * 1 on success get LBR callchain information |
| * 0 no available LBR callchain information, should try fp |
| * negative error code on other errors. |
| */ |
| static int resolve_lbr_callchain_sample(struct thread *thread, |
| struct perf_sample *sample, |
| struct symbol **parent, |
| struct addr_location *root_al, |
| int max_stack) |
| { |
| struct ip_callchain *chain = sample->callchain; |
| int chain_nr = min(max_stack, (int)chain->nr); |
| int i, j, err; |
| u64 ip; |
| |
| for (i = 0; i < chain_nr; i++) { |
| if (chain->ips[i] == PERF_CONTEXT_USER) |
| break; |
| } |
| |
| /* LBR only affects the user callchain */ |
| if (i != chain_nr) { |
| struct branch_stack *lbr_stack = sample->branch_stack; |
| int lbr_nr = lbr_stack->nr; |
| /* |
| * LBR callstack can only get user call chain. |
| * The mix_chain_nr is kernel call chain |
| * number plus LBR user call chain number. |
| * i is kernel call chain number, |
| * 1 is PERF_CONTEXT_USER, |
| * lbr_nr + 1 is the user call chain number. |
| * For details, please refer to the comments |
| * in callchain__printf |
| */ |
| int mix_chain_nr = i + 1 + lbr_nr + 1; |
| |
| if (mix_chain_nr > PERF_MAX_STACK_DEPTH + PERF_MAX_BRANCH_DEPTH) { |
| pr_warning("corrupted callchain. skipping...\n"); |
| return 0; |
| } |
| |
| for (j = 0; j < mix_chain_nr; j++) { |
| if (callchain_param.order == ORDER_CALLEE) { |
| if (j < i + 1) |
| ip = chain->ips[j]; |
| else if (j > i + 1) |
| ip = lbr_stack->entries[j - i - 2].from; |
| else |
| ip = lbr_stack->entries[0].to; |
| } else { |
| if (j < lbr_nr) |
| ip = lbr_stack->entries[lbr_nr - j - 1].from; |
| else if (j > lbr_nr) |
| ip = chain->ips[i + 1 - (j - lbr_nr)]; |
| else |
| ip = lbr_stack->entries[0].to; |
| } |
| |
| err = add_callchain_ip(thread, parent, root_al, false, ip); |
| if (err) |
| return (err < 0) ? err : 0; |
| } |
| return 1; |
| } |
| |
| return 0; |
| } |
| |
| static int thread__resolve_callchain_sample(struct thread *thread, |
| struct perf_evsel *evsel, |
| struct perf_sample *sample, |
| struct symbol **parent, |
| struct addr_location *root_al, |
| int max_stack) |
| { |
| struct branch_stack *branch = sample->branch_stack; |
| struct ip_callchain *chain = sample->callchain; |
| int chain_nr = min(max_stack, (int)chain->nr); |
| int i, j, err; |
| int skip_idx = -1; |
| int first_call = 0; |
| |
| callchain_cursor_reset(&callchain_cursor); |
| |
| if (has_branch_callstack(evsel)) { |
| err = resolve_lbr_callchain_sample(thread, sample, parent, |
| root_al, max_stack); |
| if (err) |
| return (err < 0) ? err : 0; |
| } |
| |
| /* |
| * Based on DWARF debug information, some architectures skip |
| * a callchain entry saved by the kernel. |
| */ |
| if (chain->nr < PERF_MAX_STACK_DEPTH) |
| skip_idx = arch_skip_callchain_idx(thread, chain); |
| |
| /* |
| * Add branches to call stack for easier browsing. This gives |
| * more context for a sample than just the callers. |
| * |
| * This uses individual histograms of paths compared to the |
| * aggregated histograms the normal LBR mode uses. |
| * |
| * Limitations for now: |
| * - No extra filters |
| * - No annotations (should annotate somehow) |
| */ |
| |
| if (branch && callchain_param.branch_callstack) { |
| int nr = min(max_stack, (int)branch->nr); |
| struct branch_entry be[nr]; |
| |
| if (branch->nr > PERF_MAX_BRANCH_DEPTH) { |
| pr_warning("corrupted branch chain. skipping...\n"); |
| goto check_calls; |
| } |
| |
| for (i = 0; i < nr; i++) { |
| if (callchain_param.order == ORDER_CALLEE) { |
| be[i] = branch->entries[i]; |
| /* |
| * Check for overlap into the callchain. |
| * The return address is one off compared to |
| * the branch entry. To adjust for this |
| * assume the calling instruction is not longer |
| * than 8 bytes. |
| */ |
| if (i == skip_idx || |
| chain->ips[first_call] >= PERF_CONTEXT_MAX) |
| first_call++; |
| else if (be[i].from < chain->ips[first_call] && |
| be[i].from >= chain->ips[first_call] - 8) |
| first_call++; |
| } else |
| be[i] = branch->entries[branch->nr - i - 1]; |
| } |
| |
| nr = remove_loops(be, nr); |
| |
| for (i = 0; i < nr; i++) { |
| err = add_callchain_ip(thread, parent, root_al, |
| true, be[i].to); |
| if (!err) |
| err = add_callchain_ip(thread, parent, root_al, |
| true, be[i].from); |
| if (err == -EINVAL) |
| break; |
| if (err) |
| return err; |
| } |
| chain_nr -= nr; |
| } |
| |
| check_calls: |
| if (chain->nr > PERF_MAX_STACK_DEPTH) { |
| pr_warning("corrupted callchain. skipping...\n"); |
| return 0; |
| } |
| |
| for (i = first_call; i < chain_nr; i++) { |
| u64 ip; |
| |
| if (callchain_param.order == ORDER_CALLEE) |
| j = i; |
| else |
| j = chain->nr - i - 1; |
| |
| #ifdef HAVE_SKIP_CALLCHAIN_IDX |
| if (j == skip_idx) |
| continue; |
| #endif |
| ip = chain->ips[j]; |
| |
| err = add_callchain_ip(thread, parent, root_al, false, ip); |
| |
| if (err) |
| return (err < 0) ? err : 0; |
| } |
| |
| return 0; |
| } |
| |
| static int unwind_entry(struct unwind_entry *entry, void *arg) |
| { |
| struct callchain_cursor *cursor = arg; |
| return callchain_cursor_append(cursor, entry->ip, |
| entry->map, entry->sym); |
| } |
| |
| int thread__resolve_callchain(struct thread *thread, |
| struct perf_evsel *evsel, |
| struct perf_sample *sample, |
| struct symbol **parent, |
| struct addr_location *root_al, |
| int max_stack) |
| { |
| int ret = thread__resolve_callchain_sample(thread, evsel, |
| sample, parent, |
| root_al, max_stack); |
| if (ret) |
| return ret; |
| |
| /* Can we do dwarf post unwind? */ |
| if (!((evsel->attr.sample_type & PERF_SAMPLE_REGS_USER) && |
| (evsel->attr.sample_type & PERF_SAMPLE_STACK_USER))) |
| return 0; |
| |
| /* Bail out if nothing was captured. */ |
| if ((!sample->user_regs.regs) || |
| (!sample->user_stack.size)) |
| return 0; |
| |
| return unwind__get_entries(unwind_entry, &callchain_cursor, |
| thread, sample, max_stack); |
| |
| } |
| |
| int machine__for_each_thread(struct machine *machine, |
| int (*fn)(struct thread *thread, void *p), |
| void *priv) |
| { |
| struct rb_node *nd; |
| struct thread *thread; |
| int rc = 0; |
| |
| for (nd = rb_first(&machine->threads); nd; nd = rb_next(nd)) { |
| thread = rb_entry(nd, struct thread, rb_node); |
| rc = fn(thread, priv); |
| if (rc != 0) |
| return rc; |
| } |
| |
| list_for_each_entry(thread, &machine->dead_threads, node) { |
| rc = fn(thread, priv); |
| if (rc != 0) |
| return rc; |
| } |
| return rc; |
| } |
| |
| int __machine__synthesize_threads(struct machine *machine, struct perf_tool *tool, |
| struct target *target, struct thread_map *threads, |
| perf_event__handler_t process, bool data_mmap) |
| { |
| if (target__has_task(target)) |
| return perf_event__synthesize_thread_map(tool, threads, process, machine, data_mmap); |
| else if (target__has_cpu(target)) |
| return perf_event__synthesize_threads(tool, process, machine, data_mmap); |
| /* command specified */ |
| return 0; |
| } |
| |
| pid_t machine__get_current_tid(struct machine *machine, int cpu) |
| { |
| if (cpu < 0 || cpu >= MAX_NR_CPUS || !machine->current_tid) |
| return -1; |
| |
| return machine->current_tid[cpu]; |
| } |
| |
| int machine__set_current_tid(struct machine *machine, int cpu, pid_t pid, |
| pid_t tid) |
| { |
| struct thread *thread; |
| |
| if (cpu < 0) |
| return -EINVAL; |
| |
| if (!machine->current_tid) { |
| int i; |
| |
| machine->current_tid = calloc(MAX_NR_CPUS, sizeof(pid_t)); |
| if (!machine->current_tid) |
| return -ENOMEM; |
| for (i = 0; i < MAX_NR_CPUS; i++) |
| machine->current_tid[i] = -1; |
| } |
| |
| if (cpu >= MAX_NR_CPUS) { |
| pr_err("Requested CPU %d too large. ", cpu); |
| pr_err("Consider raising MAX_NR_CPUS\n"); |
| return -EINVAL; |
| } |
| |
| machine->current_tid[cpu] = tid; |
| |
| thread = machine__findnew_thread(machine, pid, tid); |
| if (!thread) |
| return -ENOMEM; |
| |
| thread->cpu = cpu; |
| |
| return 0; |
| } |
| |
| int machine__get_kernel_start(struct machine *machine) |
| { |
| struct map *map = machine__kernel_map(machine, MAP__FUNCTION); |
| int err = 0; |
| |
| /* |
| * The only addresses above 2^63 are kernel addresses of a 64-bit |
| * kernel. Note that addresses are unsigned so that on a 32-bit system |
| * all addresses including kernel addresses are less than 2^32. In |
| * that case (32-bit system), if the kernel mapping is unknown, all |
| * addresses will be assumed to be in user space - see |
| * machine__kernel_ip(). |
| */ |
| machine->kernel_start = 1ULL << 63; |
| if (map) { |
| err = map__load(map, machine->symbol_filter); |
| if (map->start) |
| machine->kernel_start = map->start; |
| } |
| return err; |
| } |