| // SPDX-License-Identifier: GPL-2.0 |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <linux/kernel.h> |
| #include <linux/zalloc.h> |
| #include "dso.h" |
| #include "session.h" |
| #include "thread.h" |
| #include "thread-stack.h" |
| #include "debug.h" |
| #include "namespaces.h" |
| #include "comm.h" |
| #include "map.h" |
| #include "symbol.h" |
| #include "unwind.h" |
| #include "callchain.h" |
| |
| #include <api/fs/fs.h> |
| |
| int thread__init_maps(struct thread *thread, struct machine *machine) |
| { |
| pid_t pid = thread__pid(thread); |
| |
| if (pid == thread__tid(thread) || pid == -1) { |
| thread__set_maps(thread, maps__new(machine)); |
| } else { |
| struct thread *leader = machine__findnew_thread(machine, pid, pid); |
| |
| if (leader) { |
| thread__set_maps(thread, maps__get(thread__maps(leader))); |
| thread__put(leader); |
| } |
| } |
| |
| return thread__maps(thread) ? 0 : -1; |
| } |
| |
| struct thread *thread__new(pid_t pid, pid_t tid) |
| { |
| RC_STRUCT(thread) *_thread = zalloc(sizeof(*_thread)); |
| struct thread *thread; |
| |
| if (ADD_RC_CHK(thread, _thread) != NULL) { |
| struct comm *comm; |
| char comm_str[32]; |
| |
| thread__set_pid(thread, pid); |
| thread__set_tid(thread, tid); |
| thread__set_ppid(thread, -1); |
| thread__set_cpu(thread, -1); |
| thread__set_guest_cpu(thread, -1); |
| thread__set_lbr_stitch_enable(thread, false); |
| INIT_LIST_HEAD(thread__namespaces_list(thread)); |
| INIT_LIST_HEAD(thread__comm_list(thread)); |
| init_rwsem(thread__namespaces_lock(thread)); |
| init_rwsem(thread__comm_lock(thread)); |
| |
| snprintf(comm_str, sizeof(comm_str), ":%d", tid); |
| comm = comm__new(comm_str, 0, false); |
| if (!comm) |
| goto err_thread; |
| |
| list_add(&comm->list, thread__comm_list(thread)); |
| refcount_set(thread__refcnt(thread), 1); |
| /* Thread holds first ref to nsdata. */ |
| RC_CHK_ACCESS(thread)->nsinfo = nsinfo__new(pid); |
| srccode_state_init(thread__srccode_state(thread)); |
| } |
| |
| return thread; |
| |
| err_thread: |
| thread__delete(thread); |
| return NULL; |
| } |
| |
| static void (*thread__priv_destructor)(void *priv); |
| |
| void thread__set_priv_destructor(void (*destructor)(void *priv)) |
| { |
| assert(thread__priv_destructor == NULL); |
| |
| thread__priv_destructor = destructor; |
| } |
| |
| void thread__delete(struct thread *thread) |
| { |
| struct namespaces *namespaces, *tmp_namespaces; |
| struct comm *comm, *tmp_comm; |
| |
| thread_stack__free(thread); |
| |
| if (thread__maps(thread)) { |
| maps__put(thread__maps(thread)); |
| thread__set_maps(thread, NULL); |
| } |
| down_write(thread__namespaces_lock(thread)); |
| list_for_each_entry_safe(namespaces, tmp_namespaces, |
| thread__namespaces_list(thread), list) { |
| list_del_init(&namespaces->list); |
| namespaces__free(namespaces); |
| } |
| up_write(thread__namespaces_lock(thread)); |
| |
| down_write(thread__comm_lock(thread)); |
| list_for_each_entry_safe(comm, tmp_comm, thread__comm_list(thread), list) { |
| list_del_init(&comm->list); |
| comm__free(comm); |
| } |
| up_write(thread__comm_lock(thread)); |
| |
| nsinfo__zput(RC_CHK_ACCESS(thread)->nsinfo); |
| srccode_state_free(thread__srccode_state(thread)); |
| |
| exit_rwsem(thread__namespaces_lock(thread)); |
| exit_rwsem(thread__comm_lock(thread)); |
| thread__free_stitch_list(thread); |
| |
| if (thread__priv_destructor) |
| thread__priv_destructor(thread__priv(thread)); |
| |
| RC_CHK_FREE(thread); |
| } |
| |
| struct thread *thread__get(struct thread *thread) |
| { |
| struct thread *result; |
| |
| if (RC_CHK_GET(result, thread)) |
| refcount_inc(thread__refcnt(thread)); |
| |
| return result; |
| } |
| |
| void thread__put(struct thread *thread) |
| { |
| if (thread && refcount_dec_and_test(thread__refcnt(thread))) |
| thread__delete(thread); |
| else |
| RC_CHK_PUT(thread); |
| } |
| |
| static struct namespaces *__thread__namespaces(struct thread *thread) |
| { |
| if (list_empty(thread__namespaces_list(thread))) |
| return NULL; |
| |
| return list_first_entry(thread__namespaces_list(thread), struct namespaces, list); |
| } |
| |
| struct namespaces *thread__namespaces(struct thread *thread) |
| { |
| struct namespaces *ns; |
| |
| down_read(thread__namespaces_lock(thread)); |
| ns = __thread__namespaces(thread); |
| up_read(thread__namespaces_lock(thread)); |
| |
| return ns; |
| } |
| |
| static int __thread__set_namespaces(struct thread *thread, u64 timestamp, |
| struct perf_record_namespaces *event) |
| { |
| struct namespaces *new, *curr = __thread__namespaces(thread); |
| |
| new = namespaces__new(event); |
| if (!new) |
| return -ENOMEM; |
| |
| list_add(&new->list, thread__namespaces_list(thread)); |
| |
| if (timestamp && curr) { |
| /* |
| * setns syscall must have changed few or all the namespaces |
| * of this thread. Update end time for the namespaces |
| * previously used. |
| */ |
| curr = list_next_entry(new, list); |
| curr->end_time = timestamp; |
| } |
| |
| return 0; |
| } |
| |
| int thread__set_namespaces(struct thread *thread, u64 timestamp, |
| struct perf_record_namespaces *event) |
| { |
| int ret; |
| |
| down_write(thread__namespaces_lock(thread)); |
| ret = __thread__set_namespaces(thread, timestamp, event); |
| up_write(thread__namespaces_lock(thread)); |
| return ret; |
| } |
| |
| struct comm *thread__comm(struct thread *thread) |
| { |
| if (list_empty(thread__comm_list(thread))) |
| return NULL; |
| |
| return list_first_entry(thread__comm_list(thread), struct comm, list); |
| } |
| |
| struct comm *thread__exec_comm(struct thread *thread) |
| { |
| struct comm *comm, *last = NULL, *second_last = NULL; |
| |
| list_for_each_entry(comm, thread__comm_list(thread), list) { |
| if (comm->exec) |
| return comm; |
| second_last = last; |
| last = comm; |
| } |
| |
| /* |
| * 'last' with no start time might be the parent's comm of a synthesized |
| * thread (created by processing a synthesized fork event). For a main |
| * thread, that is very probably wrong. Prefer a later comm to avoid |
| * that case. |
| */ |
| if (second_last && !last->start && thread__pid(thread) == thread__tid(thread)) |
| return second_last; |
| |
| return last; |
| } |
| |
| static int ____thread__set_comm(struct thread *thread, const char *str, |
| u64 timestamp, bool exec) |
| { |
| struct comm *new, *curr = thread__comm(thread); |
| |
| /* Override the default :tid entry */ |
| if (!thread__comm_set(thread)) { |
| int err = comm__override(curr, str, timestamp, exec); |
| if (err) |
| return err; |
| } else { |
| new = comm__new(str, timestamp, exec); |
| if (!new) |
| return -ENOMEM; |
| list_add(&new->list, thread__comm_list(thread)); |
| |
| if (exec) |
| unwind__flush_access(thread__maps(thread)); |
| } |
| |
| thread__set_comm_set(thread, true); |
| |
| return 0; |
| } |
| |
| int __thread__set_comm(struct thread *thread, const char *str, u64 timestamp, |
| bool exec) |
| { |
| int ret; |
| |
| down_write(thread__comm_lock(thread)); |
| ret = ____thread__set_comm(thread, str, timestamp, exec); |
| up_write(thread__comm_lock(thread)); |
| return ret; |
| } |
| |
| int thread__set_comm_from_proc(struct thread *thread) |
| { |
| char path[64]; |
| char *comm = NULL; |
| size_t sz; |
| int err = -1; |
| |
| if (!(snprintf(path, sizeof(path), "%d/task/%d/comm", |
| thread__pid(thread), thread__tid(thread)) >= (int)sizeof(path)) && |
| procfs__read_str(path, &comm, &sz) == 0) { |
| comm[sz - 1] = '\0'; |
| err = thread__set_comm(thread, comm, 0); |
| } |
| |
| return err; |
| } |
| |
| static const char *__thread__comm_str(struct thread *thread) |
| { |
| const struct comm *comm = thread__comm(thread); |
| |
| if (!comm) |
| return NULL; |
| |
| return comm__str(comm); |
| } |
| |
| const char *thread__comm_str(struct thread *thread) |
| { |
| const char *str; |
| |
| down_read(thread__comm_lock(thread)); |
| str = __thread__comm_str(thread); |
| up_read(thread__comm_lock(thread)); |
| |
| return str; |
| } |
| |
| static int __thread__comm_len(struct thread *thread, const char *comm) |
| { |
| if (!comm) |
| return 0; |
| thread__set_comm_len(thread, strlen(comm)); |
| |
| return thread__var_comm_len(thread); |
| } |
| |
| /* CHECKME: it should probably better return the max comm len from its comm list */ |
| int thread__comm_len(struct thread *thread) |
| { |
| int comm_len = thread__var_comm_len(thread); |
| |
| if (!comm_len) { |
| const char *comm; |
| |
| down_read(thread__comm_lock(thread)); |
| comm = __thread__comm_str(thread); |
| comm_len = __thread__comm_len(thread, comm); |
| up_read(thread__comm_lock(thread)); |
| } |
| |
| return comm_len; |
| } |
| |
| size_t thread__fprintf(struct thread *thread, FILE *fp) |
| { |
| return fprintf(fp, "Thread %d %s\n", thread__tid(thread), thread__comm_str(thread)) + |
| maps__fprintf(thread__maps(thread), fp); |
| } |
| |
| int thread__insert_map(struct thread *thread, struct map *map) |
| { |
| int ret; |
| |
| ret = unwind__prepare_access(thread__maps(thread), map, NULL); |
| if (ret) |
| return ret; |
| |
| return maps__fixup_overlap_and_insert(thread__maps(thread), map); |
| } |
| |
| struct thread__prepare_access_maps_cb_args { |
| int err; |
| struct maps *maps; |
| }; |
| |
| static int thread__prepare_access_maps_cb(struct map *map, void *data) |
| { |
| bool initialized = false; |
| struct thread__prepare_access_maps_cb_args *args = data; |
| |
| args->err = unwind__prepare_access(args->maps, map, &initialized); |
| |
| return (args->err || initialized) ? 1 : 0; |
| } |
| |
| static int thread__prepare_access(struct thread *thread) |
| { |
| struct thread__prepare_access_maps_cb_args args = { |
| .err = 0, |
| }; |
| |
| if (dwarf_callchain_users) { |
| args.maps = thread__maps(thread); |
| maps__for_each_map(thread__maps(thread), thread__prepare_access_maps_cb, &args); |
| } |
| |
| return args.err; |
| } |
| |
| static int thread__clone_maps(struct thread *thread, struct thread *parent, bool do_maps_clone) |
| { |
| /* This is new thread, we share map groups for process. */ |
| if (thread__pid(thread) == thread__pid(parent)) |
| return thread__prepare_access(thread); |
| |
| if (maps__equal(thread__maps(thread), thread__maps(parent))) { |
| pr_debug("broken map groups on thread %d/%d parent %d/%d\n", |
| thread__pid(thread), thread__tid(thread), |
| thread__pid(parent), thread__tid(parent)); |
| return 0; |
| } |
| /* But this one is new process, copy maps. */ |
| return do_maps_clone ? maps__copy_from(thread__maps(thread), thread__maps(parent)) : 0; |
| } |
| |
| int thread__fork(struct thread *thread, struct thread *parent, u64 timestamp, bool do_maps_clone) |
| { |
| if (thread__comm_set(parent)) { |
| const char *comm = thread__comm_str(parent); |
| int err; |
| if (!comm) |
| return -ENOMEM; |
| err = thread__set_comm(thread, comm, timestamp); |
| if (err) |
| return err; |
| } |
| |
| thread__set_ppid(thread, thread__tid(parent)); |
| return thread__clone_maps(thread, parent, do_maps_clone); |
| } |
| |
| void thread__find_cpumode_addr_location(struct thread *thread, u64 addr, |
| struct addr_location *al) |
| { |
| size_t i; |
| const u8 cpumodes[] = { |
| PERF_RECORD_MISC_USER, |
| PERF_RECORD_MISC_KERNEL, |
| PERF_RECORD_MISC_GUEST_USER, |
| PERF_RECORD_MISC_GUEST_KERNEL |
| }; |
| |
| for (i = 0; i < ARRAY_SIZE(cpumodes); i++) { |
| thread__find_symbol(thread, cpumodes[i], addr, al); |
| if (al->map) |
| break; |
| } |
| } |
| |
| struct thread *thread__main_thread(struct machine *machine, struct thread *thread) |
| { |
| if (thread__pid(thread) == thread__tid(thread)) |
| return thread__get(thread); |
| |
| if (thread__pid(thread) == -1) |
| return NULL; |
| |
| return machine__find_thread(machine, thread__pid(thread), thread__pid(thread)); |
| } |
| |
| int thread__memcpy(struct thread *thread, struct machine *machine, |
| void *buf, u64 ip, int len, bool *is64bit) |
| { |
| u8 cpumode = PERF_RECORD_MISC_USER; |
| struct addr_location al; |
| struct dso *dso; |
| long offset; |
| |
| if (machine__kernel_ip(machine, ip)) |
| cpumode = PERF_RECORD_MISC_KERNEL; |
| |
| addr_location__init(&al); |
| if (!thread__find_map(thread, cpumode, ip, &al)) { |
| addr_location__exit(&al); |
| return -1; |
| } |
| |
| dso = map__dso(al.map); |
| |
| if (!dso || dso__data(dso)->status == DSO_DATA_STATUS_ERROR || map__load(al.map) < 0) { |
| addr_location__exit(&al); |
| return -1; |
| } |
| |
| offset = map__map_ip(al.map, ip); |
| if (is64bit) |
| *is64bit = dso__is_64_bit(dso); |
| |
| addr_location__exit(&al); |
| |
| return dso__data_read_offset(dso, machine, offset, buf, len); |
| } |
| |
| void thread__free_stitch_list(struct thread *thread) |
| { |
| struct lbr_stitch *lbr_stitch = thread__lbr_stitch(thread); |
| struct stitch_list *pos, *tmp; |
| |
| if (!lbr_stitch) |
| return; |
| |
| list_for_each_entry_safe(pos, tmp, &lbr_stitch->lists, node) { |
| list_del_init(&pos->node); |
| free(pos); |
| } |
| |
| list_for_each_entry_safe(pos, tmp, &lbr_stitch->free_lists, node) { |
| list_del_init(&pos->node); |
| free(pos); |
| } |
| |
| zfree(&lbr_stitch->prev_lbr_cursor); |
| free(thread__lbr_stitch(thread)); |
| thread__set_lbr_stitch(thread, NULL); |
| } |