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- // SPDX-License-Identifier: GPL-2.0
- #include <dirent.h>
- #include <errno.h>
- #include <inttypes.h>
- #include <regex.h>
- #include <stdlib.h>
- #include "callchain.h"
- #include "debug.h"
- #include "dso.h"
- #include "env.h"
- #include "event.h"
- #include "evsel.h"
- #include "hist.h"
- #include "machine.h"
- #include "map.h"
- #include "map_symbol.h"
- #include "branch.h"
- #include "mem-events.h"
- #include "srcline.h"
- #include "symbol.h"
- #include "sort.h"
- #include "strlist.h"
- #include "target.h"
- #include "thread.h"
- #include "util.h"
- #include "vdso.h"
- #include <stdbool.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <unistd.h>
- #include "unwind.h"
- #include "linux/hash.h"
- #include "asm/bug.h"
- #include "bpf-event.h"
- #include <internal/lib.h> // page_size
- #include "cgroup.h"
- #include <linux/ctype.h>
- #include <symbol/kallsyms.h>
- #include <linux/mman.h>
- #include <linux/string.h>
- #include <linux/zalloc.h>
- static void __machine__remove_thread(struct machine *machine, struct thread *th, bool lock);
- static struct dso *machine__kernel_dso(struct machine *machine)
- {
- return machine->vmlinux_map->dso;
- }
- static void dsos__init(struct dsos *dsos)
- {
- INIT_LIST_HEAD(&dsos->head);
- dsos->root = RB_ROOT;
- init_rwsem(&dsos->lock);
- }
- static void machine__threads_init(struct machine *machine)
- {
- int i;
- for (i = 0; i < THREADS__TABLE_SIZE; i++) {
- struct threads *threads = &machine->threads[i];
- threads->entries = RB_ROOT_CACHED;
- init_rwsem(&threads->lock);
- threads->nr = 0;
- INIT_LIST_HEAD(&threads->dead);
- threads->last_match = NULL;
- }
- }
- static int machine__set_mmap_name(struct machine *machine)
- {
- if (machine__is_host(machine))
- machine->mmap_name = strdup("[kernel.kallsyms]");
- else if (machine__is_default_guest(machine))
- machine->mmap_name = strdup("[guest.kernel.kallsyms]");
- else if (asprintf(&machine->mmap_name, "[guest.kernel.kallsyms.%d]",
- machine->pid) < 0)
- machine->mmap_name = NULL;
- return machine->mmap_name ? 0 : -ENOMEM;
- }
- int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
- {
- int err = -ENOMEM;
- memset(machine, 0, sizeof(*machine));
- maps__init(&machine->kmaps, machine);
- RB_CLEAR_NODE(&machine->rb_node);
- dsos__init(&machine->dsos);
- machine__threads_init(machine);
- machine->vdso_info = NULL;
- machine->env = NULL;
- machine->pid = pid;
- machine->id_hdr_size = 0;
- machine->kptr_restrict_warned = false;
- machine->comm_exec = false;
- machine->kernel_start = 0;
- machine->vmlinux_map = NULL;
- machine->root_dir = strdup(root_dir);
- if (machine->root_dir == NULL)
- return -ENOMEM;
- if (machine__set_mmap_name(machine))
- goto out;
- if (pid != HOST_KERNEL_ID) {
- struct thread *thread = machine__findnew_thread(machine, -1,
- pid);
- char comm[64];
- if (thread == NULL)
- goto out;
- snprintf(comm, sizeof(comm), "[guest/%d]", pid);
- thread__set_comm(thread, comm, 0);
- thread__put(thread);
- }
- machine->current_tid = NULL;
- err = 0;
- out:
- if (err) {
- zfree(&machine->root_dir);
- zfree(&machine->mmap_name);
- }
- 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;
- }
- struct machine *machine__new_kallsyms(void)
- {
- struct machine *machine = machine__new_host();
- /*
- * FIXME:
- * 1) We should switch to machine__load_kallsyms(), i.e. not explicitly
- * ask for not using the kcore parsing code, once this one is fixed
- * to create a map per module.
- */
- if (machine && machine__load_kallsyms(machine, "/proc/kallsyms") <= 0) {
- machine__delete(machine);
- machine = NULL;
- }
- return machine;
- }
- static void dsos__purge(struct dsos *dsos)
- {
- struct dso *pos, *n;
- down_write(&dsos->lock);
- list_for_each_entry_safe(pos, n, &dsos->head, node) {
- RB_CLEAR_NODE(&pos->rb_node);
- pos->root = NULL;
- list_del_init(&pos->node);
- dso__put(pos);
- }
- up_write(&dsos->lock);
- }
- static void dsos__exit(struct dsos *dsos)
- {
- dsos__purge(dsos);
- exit_rwsem(&dsos->lock);
- }
- void machine__delete_threads(struct machine *machine)
- {
- struct rb_node *nd;
- int i;
- for (i = 0; i < THREADS__TABLE_SIZE; i++) {
- struct threads *threads = &machine->threads[i];
- down_write(&threads->lock);
- nd = rb_first_cached(&threads->entries);
- while (nd) {
- struct thread *t = rb_entry(nd, struct thread, rb_node);
- nd = rb_next(nd);
- __machine__remove_thread(machine, t, false);
- }
- up_write(&threads->lock);
- }
- }
- void machine__exit(struct machine *machine)
- {
- int i;
- if (machine == NULL)
- return;
- machine__destroy_kernel_maps(machine);
- maps__exit(&machine->kmaps);
- dsos__exit(&machine->dsos);
- machine__exit_vdso(machine);
- zfree(&machine->root_dir);
- zfree(&machine->mmap_name);
- zfree(&machine->current_tid);
- for (i = 0; i < THREADS__TABLE_SIZE; i++) {
- struct threads *threads = &machine->threads[i];
- struct thread *thread, *n;
- /*
- * Forget about the dead, at this point whatever threads were
- * left in the dead lists better have a reference count taken
- * by who is using them, and then, when they drop those references
- * and it finally hits zero, thread__put() will check and see that
- * its not in the dead threads list and will not try to remove it
- * from there, just calling thread__delete() straight away.
- */
- list_for_each_entry_safe(thread, n, &threads->dead, node)
- list_del_init(&thread->node);
- exit_rwsem(&threads->lock);
- }
- }
- void machine__delete(struct machine *machine)
- {
- if (machine) {
- machine__exit(machine);
- free(machine);
- }
- }
- void machines__init(struct machines *machines)
- {
- machine__init(&machines->host, "", HOST_KERNEL_ID);
- machines->guests = RB_ROOT_CACHED;
- }
- 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_root.rb_node;
- struct rb_node *parent = NULL;
- struct machine *pos, *machine = malloc(sizeof(*machine));
- bool leftmost = true;
- if (machine == NULL)
- return NULL;
- if (machine__init(machine, root_dir, pid) != 0) {
- free(machine);
- return NULL;
- }
- 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;
- leftmost = false;
- }
- }
- rb_link_node(&machine->rb_node, parent, p);
- rb_insert_color_cached(&machine->rb_node, &machines->guests, leftmost);
- return machine;
- }
- 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_cached(&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_root.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(NULL, 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_cached(&machines->guests); nd; nd = rb_next(nd)) {
- struct machine *pos = rb_entry(nd, struct machine, rb_node);
- process(pos, data);
- }
- }
- 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_cached(&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->maps)
- leader->maps = maps__new(machine);
- if (!leader->maps)
- goto out_err;
- if (th->maps == leader->maps)
- return;
- if (th->maps) {
- /*
- * 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 (!maps__empty(th->maps))
- pr_err("Discarding thread maps for %d:%d\n",
- th->pid_, th->tid);
- maps__put(th->maps);
- }
- th->maps = maps__get(leader->maps);
- out_put:
- thread__put(leader);
- return;
- out_err:
- pr_err("Failed to join map groups for %d:%d\n", th->pid_, th->tid);
- goto out_put;
- }
- /*
- * Front-end cache - TID lookups come in blocks,
- * so most of the time we dont have to look up
- * the full rbtree:
- */
- static struct thread*
- __threads__get_last_match(struct threads *threads, struct machine *machine,
- int pid, int tid)
- {
- struct thread *th;
- th = threads->last_match;
- if (th != NULL) {
- if (th->tid == tid) {
- machine__update_thread_pid(machine, th, pid);
- return thread__get(th);
- }
- threads->last_match = NULL;
- }
- return NULL;
- }
- static struct thread*
- threads__get_last_match(struct threads *threads, struct machine *machine,
- int pid, int tid)
- {
- struct thread *th = NULL;
- if (perf_singlethreaded)
- th = __threads__get_last_match(threads, machine, pid, tid);
- return th;
- }
- static void
- __threads__set_last_match(struct threads *threads, struct thread *th)
- {
- threads->last_match = th;
- }
- static void
- threads__set_last_match(struct threads *threads, struct thread *th)
- {
- if (perf_singlethreaded)
- __threads__set_last_match(threads, th);
- }
- /*
- * Caller must eventually drop thread->refcnt returned with a successful
- * lookup/new thread inserted.
- */
- static struct thread *____machine__findnew_thread(struct machine *machine,
- struct threads *threads,
- pid_t pid, pid_t tid,
- bool create)
- {
- struct rb_node **p = &threads->entries.rb_root.rb_node;
- struct rb_node *parent = NULL;
- struct thread *th;
- bool leftmost = true;
- th = threads__get_last_match(threads, machine, pid, tid);
- if (th)
- return th;
- while (*p != NULL) {
- parent = *p;
- th = rb_entry(parent, struct thread, rb_node);
- if (th->tid == tid) {
- threads__set_last_match(threads, th);
- machine__update_thread_pid(machine, th, pid);
- return thread__get(th);
- }
- if (tid < th->tid)
- p = &(*p)->rb_left;
- else {
- p = &(*p)->rb_right;
- leftmost = false;
- }
- }
- if (!create)
- return NULL;
- th = thread__new(pid, tid);
- if (th != NULL) {
- rb_link_node(&th->rb_node, parent, p);
- rb_insert_color_cached(&th->rb_node, &threads->entries, leftmost);
- /*
- * We have to initialize maps separately after rb tree is updated.
- *
- * The reason is that we call machine__findnew_thread
- * within thread__init_maps to find the thread
- * leader and that would screwed the rb tree.
- */
- if (thread__init_maps(th, machine)) {
- rb_erase_cached(&th->rb_node, &threads->entries);
- RB_CLEAR_NODE(&th->rb_node);
- thread__put(th);
- return NULL;
- }
- /*
- * It is now in the rbtree, get a ref
- */
- thread__get(th);
- threads__set_last_match(threads, th);
- ++threads->nr;
- }
- return th;
- }
- struct thread *__machine__findnew_thread(struct machine *machine, pid_t pid, pid_t tid)
- {
- return ____machine__findnew_thread(machine, machine__threads(machine, tid), pid, tid, true);
- }
- struct thread *machine__findnew_thread(struct machine *machine, pid_t pid,
- pid_t tid)
- {
- struct threads *threads = machine__threads(machine, tid);
- struct thread *th;
- down_write(&threads->lock);
- th = __machine__findnew_thread(machine, pid, tid);
- up_write(&threads->lock);
- return th;
- }
- struct thread *machine__find_thread(struct machine *machine, pid_t pid,
- pid_t tid)
- {
- struct threads *threads = machine__threads(machine, tid);
- struct thread *th;
- down_read(&threads->lock);
- th = ____machine__findnew_thread(machine, threads, pid, tid, false);
- up_read(&threads->lock);
- return th;
- }
- 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;
- int err = 0;
- 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");
- err = -1;
- }
- thread__put(thread);
- return err;
- }
- int machine__process_namespaces_event(struct machine *machine __maybe_unused,
- union perf_event *event,
- struct perf_sample *sample __maybe_unused)
- {
- struct thread *thread = machine__findnew_thread(machine,
- event->namespaces.pid,
- event->namespaces.tid);
- int err = 0;
- WARN_ONCE(event->namespaces.nr_namespaces > NR_NAMESPACES,
- "\nWARNING: kernel seems to support more namespaces than perf"
- " tool.\nTry updating the perf tool..\n\n");
- WARN_ONCE(event->namespaces.nr_namespaces < NR_NAMESPACES,
- "\nWARNING: perf tool seems to support more namespaces than"
- " the kernel.\nTry updating the kernel..\n\n");
- if (dump_trace)
- perf_event__fprintf_namespaces(event, stdout);
- if (thread == NULL ||
- thread__set_namespaces(thread, sample->time, &event->namespaces)) {
- dump_printf("problem processing PERF_RECORD_NAMESPACES, skipping event.\n");
- err = -1;
- }
- thread__put(thread);
- return err;
- }
- int machine__process_cgroup_event(struct machine *machine,
- union perf_event *event,
- struct perf_sample *sample __maybe_unused)
- {
- struct cgroup *cgrp;
- if (dump_trace)
- perf_event__fprintf_cgroup(event, stdout);
- cgrp = cgroup__findnew(machine->env, event->cgroup.id, event->cgroup.path);
- if (cgrp == NULL)
- return -ENOMEM;
- 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:%" PRI_lu64 ": lost:%" PRI_lu64 "\n",
- event->lost.id, event->lost.lost);
- return 0;
- }
- int machine__process_lost_samples_event(struct machine *machine __maybe_unused,
- union perf_event *event, struct perf_sample *sample)
- {
- dump_printf(": id:%" PRIu64 ": lost samples :%" PRI_lu64 "\n",
- sample->id, event->lost_samples.lost);
- return 0;
- }
- static struct dso *machine__findnew_module_dso(struct machine *machine,
- struct kmod_path *m,
- const char *filename)
- {
- struct dso *dso;
- down_write(&machine->dsos.lock);
- dso = __dsos__find(&machine->dsos, m->name, true);
- if (!dso) {
- dso = __dsos__addnew(&machine->dsos, m->name);
- if (dso == NULL)
- goto out_unlock;
- dso__set_module_info(dso, m, machine);
- dso__set_long_name(dso, strdup(filename), true);
- dso->kernel = DSO_SPACE__KERNEL;
- }
- dso__get(dso);
- out_unlock:
- up_write(&machine->dsos.lock);
- return dso;
- }
- int machine__process_aux_event(struct machine *machine __maybe_unused,
- union perf_event *event)
- {
- if (dump_trace)
- perf_event__fprintf_aux(event, stdout);
- return 0;
- }
- int machine__process_itrace_start_event(struct machine *machine __maybe_unused,
- union perf_event *event)
- {
- if (dump_trace)
- perf_event__fprintf_itrace_start(event, stdout);
- return 0;
- }
- int machine__process_switch_event(struct machine *machine __maybe_unused,
- union perf_event *event)
- {
- if (dump_trace)
- perf_event__fprintf_switch(event, stdout);
- return 0;
- }
- static int machine__process_ksymbol_register(struct machine *machine,
- union perf_event *event,
- struct perf_sample *sample __maybe_unused)
- {
- struct symbol *sym;
- struct map *map = maps__find(&machine->kmaps, event->ksymbol.addr);
- if (!map) {
- struct dso *dso = dso__new(event->ksymbol.name);
- if (dso) {
- dso->kernel = DSO_SPACE__KERNEL;
- map = map__new2(0, dso);
- }
- if (!dso || !map) {
- dso__put(dso);
- return -ENOMEM;
- }
- if (event->ksymbol.ksym_type == PERF_RECORD_KSYMBOL_TYPE_OOL) {
- map->dso->binary_type = DSO_BINARY_TYPE__OOL;
- map->dso->data.file_size = event->ksymbol.len;
- dso__set_loaded(map->dso);
- }
- map->start = event->ksymbol.addr;
- map->end = map->start + event->ksymbol.len;
- maps__insert(&machine->kmaps, map);
- dso__set_loaded(dso);
- if (is_bpf_image(event->ksymbol.name)) {
- dso->binary_type = DSO_BINARY_TYPE__BPF_IMAGE;
- dso__set_long_name(dso, "", false);
- }
- }
- sym = symbol__new(map->map_ip(map, map->start),
- event->ksymbol.len,
- 0, 0, event->ksymbol.name);
- if (!sym)
- return -ENOMEM;
- dso__insert_symbol(map->dso, sym);
- return 0;
- }
- static int machine__process_ksymbol_unregister(struct machine *machine,
- union perf_event *event,
- struct perf_sample *sample __maybe_unused)
- {
- struct symbol *sym;
- struct map *map;
- map = maps__find(&machine->kmaps, event->ksymbol.addr);
- if (!map)
- return 0;
- if (map != machine->vmlinux_map)
- maps__remove(&machine->kmaps, map);
- else {
- sym = dso__find_symbol(map->dso, map->map_ip(map, map->start));
- if (sym)
- dso__delete_symbol(map->dso, sym);
- }
- return 0;
- }
- int machine__process_ksymbol(struct machine *machine __maybe_unused,
- union perf_event *event,
- struct perf_sample *sample)
- {
- if (dump_trace)
- perf_event__fprintf_ksymbol(event, stdout);
- if (event->ksymbol.flags & PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER)
- return machine__process_ksymbol_unregister(machine, event,
- sample);
- return machine__process_ksymbol_register(machine, event, sample);
- }
- int machine__process_text_poke(struct machine *machine, union perf_event *event,
- struct perf_sample *sample __maybe_unused)
- {
- struct map *map = maps__find(&machine->kmaps, event->text_poke.addr);
- u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
- if (dump_trace)
- perf_event__fprintf_text_poke(event, machine, stdout);
- if (!event->text_poke.new_len)
- return 0;
- if (cpumode != PERF_RECORD_MISC_KERNEL) {
- pr_debug("%s: unsupported cpumode - ignoring\n", __func__);
- return 0;
- }
- if (map && map->dso) {
- u8 *new_bytes = event->text_poke.bytes + event->text_poke.old_len;
- int ret;
- /*
- * Kernel maps might be changed when loading symbols so loading
- * must be done prior to using kernel maps.
- */
- map__load(map);
- ret = dso__data_write_cache_addr(map->dso, map, machine,
- event->text_poke.addr,
- new_bytes,
- event->text_poke.new_len);
- if (ret != event->text_poke.new_len)
- pr_debug("Failed to write kernel text poke at %#" PRI_lx64 "\n",
- event->text_poke.addr);
- } else {
- pr_debug("Failed to find kernel text poke address map for %#" PRI_lx64 "\n",
- event->text_poke.addr);
- }
- return 0;
- }
- static struct map *machine__addnew_module_map(struct machine *machine, u64 start,
- const char *filename)
- {
- struct map *map = NULL;
- struct kmod_path m;
- struct dso *dso;
- if (kmod_path__parse_name(&m, filename))
- return NULL;
- dso = machine__findnew_module_dso(machine, &m, filename);
- if (dso == NULL)
- goto out;
- map = map__new2(start, dso);
- if (map == NULL)
- goto out;
- maps__insert(&machine->kmaps, map);
- /* Put the map here because maps__insert alread got it */
- map__put(map);
- out:
- /* put the dso here, corresponding to machine__findnew_module_dso */
- dso__put(dso);
- zfree(&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.dsos.head, fp);
- for (nd = rb_first_cached(&machines->guests); nd; nd = rb_next(nd)) {
- struct machine *pos = rb_entry(nd, struct machine, rb_node);
- ret += __dsos__fprintf(&pos->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->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_cached(&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__kernel_dso(machine);
- if (kdso->has_build_id) {
- char filename[PATH_MAX];
- if (dso__build_id_filename(kdso, filename, sizeof(filename),
- false))
- 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)
- {
- struct rb_node *nd;
- size_t ret;
- int i;
- for (i = 0; i < THREADS__TABLE_SIZE; i++) {
- struct threads *threads = &machine->threads[i];
- down_read(&threads->lock);
- ret = fprintf(fp, "Threads: %u\n", threads->nr);
- for (nd = rb_first_cached(&threads->entries); nd;
- nd = rb_next(nd)) {
- struct thread *pos = rb_entry(nd, struct thread, rb_node);
- ret += thread__fprintf(pos, fp);
- }
- up_read(&threads->lock);
- }
- return ret;
- }
- static struct dso *machine__get_kernel(struct machine *machine)
- {
- const char *vmlinux_name = machine->mmap_name;
- struct dso *kernel;
- if (machine__is_host(machine)) {
- if (symbol_conf.vmlinux_name)
- vmlinux_name = symbol_conf.vmlinux_name;
- kernel = machine__findnew_kernel(machine, vmlinux_name,
- "[kernel]", DSO_SPACE__KERNEL);
- } else {
- if (symbol_conf.default_guest_vmlinux_name)
- vmlinux_name = symbol_conf.default_guest_vmlinux_name;
- kernel = machine__findnew_kernel(machine, vmlinux_name,
- "[guest.kernel]",
- DSO_SPACE__KERNEL_GUEST);
- }
- if (kernel != NULL && (!kernel->has_build_id))
- dso__read_running_kernel_build_id(kernel, machine);
- return kernel;
- }
- struct process_args {
- u64 start;
- };
- 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 int machine__get_running_kernel_start(struct machine *machine,
- const char **symbol_name,
- u64 *start, u64 *end)
- {
- char filename[PATH_MAX];
- int i, err = -1;
- 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++) {
- err = kallsyms__get_function_start(filename, name, &addr);
- if (!err)
- break;
- }
- if (err)
- return -1;
- if (symbol_name)
- *symbol_name = name;
- *start = addr;
- err = kallsyms__get_function_start(filename, "_etext", &addr);
- if (!err)
- *end = addr;
- return 0;
- }
- int machine__create_extra_kernel_map(struct machine *machine,
- struct dso *kernel,
- struct extra_kernel_map *xm)
- {
- struct kmap *kmap;
- struct map *map;
- map = map__new2(xm->start, kernel);
- if (!map)
- return -1;
- map->end = xm->end;
- map->pgoff = xm->pgoff;
- kmap = map__kmap(map);
- strlcpy(kmap->name, xm->name, KMAP_NAME_LEN);
- maps__insert(&machine->kmaps, map);
- pr_debug2("Added extra kernel map %s %" PRIx64 "-%" PRIx64 "\n",
- kmap->name, map->start, map->end);
- map__put(map);
- return 0;
- }
- static u64 find_entry_trampoline(struct dso *dso)
- {
- /* Duplicates are removed so lookup all aliases */
- const char *syms[] = {
- "_entry_trampoline",
- "__entry_trampoline_start",
- "entry_SYSCALL_64_trampoline",
- };
- struct symbol *sym = dso__first_symbol(dso);
- unsigned int i;
- for (; sym; sym = dso__next_symbol(sym)) {
- if (sym->binding != STB_GLOBAL)
- continue;
- for (i = 0; i < ARRAY_SIZE(syms); i++) {
- if (!strcmp(sym->name, syms[i]))
- return sym->start;
- }
- }
- return 0;
- }
- /*
- * These values can be used for kernels that do not have symbols for the entry
- * trampolines in kallsyms.
- */
- #define X86_64_CPU_ENTRY_AREA_PER_CPU 0xfffffe0000000000ULL
- #define X86_64_CPU_ENTRY_AREA_SIZE 0x2c000
- #define X86_64_ENTRY_TRAMPOLINE 0x6000
- /* Map x86_64 PTI entry trampolines */
- int machine__map_x86_64_entry_trampolines(struct machine *machine,
- struct dso *kernel)
- {
- struct maps *kmaps = &machine->kmaps;
- int nr_cpus_avail, cpu;
- bool found = false;
- struct map *map;
- u64 pgoff;
- /*
- * In the vmlinux case, pgoff is a virtual address which must now be
- * mapped to a vmlinux offset.
- */
- maps__for_each_entry(kmaps, map) {
- struct kmap *kmap = __map__kmap(map);
- struct map *dest_map;
- if (!kmap || !is_entry_trampoline(kmap->name))
- continue;
- dest_map = maps__find(kmaps, map->pgoff);
- if (dest_map != map)
- map->pgoff = dest_map->map_ip(dest_map, map->pgoff);
- found = true;
- }
- if (found || machine->trampolines_mapped)
- return 0;
- pgoff = find_entry_trampoline(kernel);
- if (!pgoff)
- return 0;
- nr_cpus_avail = machine__nr_cpus_avail(machine);
- /* Add a 1 page map for each CPU's entry trampoline */
- for (cpu = 0; cpu < nr_cpus_avail; cpu++) {
- u64 va = X86_64_CPU_ENTRY_AREA_PER_CPU +
- cpu * X86_64_CPU_ENTRY_AREA_SIZE +
- X86_64_ENTRY_TRAMPOLINE;
- struct extra_kernel_map xm = {
- .start = va,
- .end = va + page_size,
- .pgoff = pgoff,
- };
- strlcpy(xm.name, ENTRY_TRAMPOLINE_NAME, KMAP_NAME_LEN);
- if (machine__create_extra_kernel_map(machine, kernel, &xm) < 0)
- return -1;
- }
- machine->trampolines_mapped = nr_cpus_avail;
- return 0;
- }
- int __weak machine__create_extra_kernel_maps(struct machine *machine __maybe_unused,
- struct dso *kernel __maybe_unused)
- {
- return 0;
- }
- static int
- __machine__create_kernel_maps(struct machine *machine, struct dso *kernel)
- {
- /* In case of renewal the kernel map, destroy previous one */
- machine__destroy_kernel_maps(machine);
- machine->vmlinux_map = map__new2(0, kernel);
- if (machine->vmlinux_map == NULL)
- return -1;
- machine->vmlinux_map->map_ip = machine->vmlinux_map->unmap_ip = identity__map_ip;
- maps__insert(&machine->kmaps, machine->vmlinux_map);
- return 0;
- }
- void machine__destroy_kernel_maps(struct machine *machine)
- {
- struct kmap *kmap;
- struct map *map = machine__kernel_map(machine);
- if (map == NULL)
- return;
- kmap = map__kmap(map);
- maps__remove(&machine->kmaps, map);
- if (kmap && kmap->ref_reloc_sym) {
- zfree((char **)&kmap->ref_reloc_sym->name);
- zfree(&kmap->ref_reloc_sym);
- }
- map__zput(machine->vmlinux_map);
- }
- 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_cached(&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_cached(&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)
- {
- struct map *map = machine__kernel_map(machine);
- int ret = __dso__load_kallsyms(map->dso, filename, map, true);
- if (ret > 0) {
- dso__set_loaded(map->dso);
- /*
- * Since /proc/kallsyms will have multiple sessions for the
- * kernel, with modules between them, fixup the end of all
- * sections.
- */
- maps__fixup_end(&machine->kmaps);
- }
- return ret;
- }
- int machine__load_vmlinux_path(struct machine *machine)
- {
- struct map *map = machine__kernel_map(machine);
- int ret = dso__load_vmlinux_path(map->dso, map);
- if (ret > 0)
- dso__set_loaded(map->dso);
- return ret;
- }
- 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;
- tmp = fgets(version, sizeof(version), file);
- fclose(file);
- if (!tmp)
- return NULL;
- 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 maps__set_module_path(struct maps *maps, const char *path, struct kmod_path *m)
- {
- char *long_name;
- struct map *map = maps__find_by_name(maps, 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++;
- map->dso->comp = m->comp;
- }
- return 0;
- }
- static int maps__set_modules_path_dir(struct maps *maps, 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 = maps__set_modules_path_dir(maps, 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 = maps__set_module_path(maps, path, &m);
- zfree(&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 maps__set_modules_path_dir(&machine->kmaps, modules_path, 0);
- }
- int __weak arch__fix_module_text_start(u64 *start __maybe_unused,
- u64 *size __maybe_unused,
- const char *name __maybe_unused)
- {
- return 0;
- }
- static int machine__create_module(void *arg, const char *name, u64 start,
- u64 size)
- {
- struct machine *machine = arg;
- struct map *map;
- if (arch__fix_module_text_start(&start, &size, name) < 0)
- return -1;
- map = machine__addnew_module_map(machine, start, name);
- if (map == NULL)
- return -1;
- map->end = start + size;
- 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;
- }
- static void machine__set_kernel_mmap(struct machine *machine,
- u64 start, u64 end)
- {
- machine->vmlinux_map->start = start;
- machine->vmlinux_map->end = end;
- /*
- * Be a bit paranoid here, some perf.data file came with
- * a zero sized synthesized MMAP event for the kernel.
- */
- if (start == 0 && end == 0)
- machine->vmlinux_map->end = ~0ULL;
- }
- static void machine__update_kernel_mmap(struct machine *machine,
- u64 start, u64 end)
- {
- struct map *map = machine__kernel_map(machine);
- map__get(map);
- maps__remove(&machine->kmaps, map);
- machine__set_kernel_mmap(machine, start, end);
- maps__insert(&machine->kmaps, map);
- map__put(map);
- }
- int machine__create_kernel_maps(struct machine *machine)
- {
- struct dso *kernel = machine__get_kernel(machine);
- const char *name = NULL;
- struct map *map;
- u64 start = 0, end = ~0ULL;
- int ret;
- if (kernel == NULL)
- return -1;
- ret = __machine__create_kernel_maps(machine, kernel);
- if (ret < 0)
- goto out_put;
- 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);
- }
- if (!machine__get_running_kernel_start(machine, &name, &start, &end)) {
- if (name &&
- map__set_kallsyms_ref_reloc_sym(machine->vmlinux_map, name, start)) {
- machine__destroy_kernel_maps(machine);
- ret = -1;
- goto out_put;
- }
- /*
- * we have a real start address now, so re-order the kmaps
- * assume it's the last in the kmaps
- */
- machine__update_kernel_mmap(machine, start, end);
- }
- if (machine__create_extra_kernel_maps(machine, kernel))
- pr_debug("Problems creating extra kernel maps, continuing anyway...\n");
- if (end == ~0ULL) {
- /* update end address of the kernel map using adjacent module address */
- map = map__next(machine__kernel_map(machine));
- if (map)
- machine__set_kernel_mmap(machine, start, map->start);
- }
- out_put:
- dso__put(kernel);
- return ret;
- }
- static bool machine__uses_kcore(struct machine *machine)
- {
- struct dso *dso;
- list_for_each_entry(dso, &machine->dsos.head, node) {
- if (dso__is_kcore(dso))
- return true;
- }
- return false;
- }
- static bool perf_event__is_extra_kernel_mmap(struct machine *machine,
- union perf_event *event)
- {
- return machine__is(machine, "x86_64") &&
- is_entry_trampoline(event->mmap.filename);
- }
- static int machine__process_extra_kernel_map(struct machine *machine,
- union perf_event *event)
- {
- struct dso *kernel = machine__kernel_dso(machine);
- struct extra_kernel_map xm = {
- .start = event->mmap.start,
- .end = event->mmap.start + event->mmap.len,
- .pgoff = event->mmap.pgoff,
- };
- if (kernel == NULL)
- return -1;
- strlcpy(xm.name, event->mmap.filename, KMAP_NAME_LEN);
- return machine__create_extra_kernel_map(machine, kernel, &xm);
- }
- static int machine__process_kernel_mmap_event(struct machine *machine,
- union perf_event *event)
- {
- struct map *map;
- enum dso_space_type dso_space;
- 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;
- if (machine__is_host(machine))
- dso_space = DSO_SPACE__KERNEL;
- else
- dso_space = DSO_SPACE__KERNEL_GUEST;
- is_kernel_mmap = memcmp(event->mmap.filename,
- machine->mmap_name,
- strlen(machine->mmap_name) - 1) == 0;
- if (event->mmap.filename[0] == '/' ||
- (!is_kernel_mmap && event->mmap.filename[0] == '[')) {
- map = machine__addnew_module_map(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(machine->mmap_name));
- /*
- * Should be there already, from the build-id table in
- * the header.
- */
- struct dso *kernel = NULL;
- struct dso *dso;
- down_read(&machine->dsos.lock);
- list_for_each_entry(dso, &machine->dsos.head, node) {
- /*
- * The cpumode passed to is_kernel_module is not the
- * cpumode of *this* event. If we insist on passing
- * correct cpumode to is_kernel_module, we should
- * record the cpumode when we adding this dso to the
- * linked list.
- *
- * However we don't really need passing correct
- * cpumode. We know the correct cpumode must be kernel
- * mode (if not, we should not link it onto kernel_dsos
- * list).
- *
- * Therefore, we pass PERF_RECORD_MISC_CPUMODE_UNKNOWN.
- * is_kernel_module() treats it as a kernel cpumode.
- */
- if (!dso->kernel ||
- is_kernel_module(dso->long_name,
- PERF_RECORD_MISC_CPUMODE_UNKNOWN))
- continue;
- kernel = dso;
- break;
- }
- up_read(&machine->dsos.lock);
- if (kernel == NULL)
- kernel = machine__findnew_dso(machine, machine->mmap_name);
- if (kernel == NULL)
- goto out_problem;
- kernel->kernel = dso_space;
- if (__machine__create_kernel_maps(machine, kernel) < 0) {
- dso__put(kernel);
- goto out_problem;
- }
- if (strstr(kernel->long_name, "vmlinux"))
- dso__set_short_name(kernel, "[kernel.vmlinux]", false);
- machine__update_kernel_mmap(machine, event->mmap.start,
- event->mmap.start + event->mmap.len);
- /*
- * 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) {
- map__set_kallsyms_ref_reloc_sym(machine->vmlinux_map,
- symbol_name,
- event->mmap.pgoff);
- }
- if (machine__is_default_guest(machine)) {
- /*
- * preload dso of guest kernel and modules
- */
- dso__load(kernel, machine__kernel_map(machine));
- }
- } else if (perf_event__is_extra_kernel_mmap(machine, event)) {
- return machine__process_extra_kernel_map(machine, event);
- }
- return 0;
- out_problem:
- return -1;
- }
- int machine__process_mmap2_event(struct machine *machine,
- union perf_event *event,
- struct perf_sample *sample)
- {
- struct thread *thread;
- struct map *map;
- struct dso_id dso_id = {
- .maj = event->mmap2.maj,
- .min = event->mmap2.min,
- .ino = event->mmap2.ino,
- .ino_generation = event->mmap2.ino_generation,
- };
- int ret = 0;
- if (dump_trace)
- perf_event__fprintf_mmap2(event, stdout);
- if (sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
- sample->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;
- map = map__new(machine, event->mmap2.start,
- event->mmap2.len, event->mmap2.pgoff,
- &dso_id, event->mmap2.prot,
- event->mmap2.flags,
- event->mmap2.filename, thread);
- if (map == NULL)
- goto out_problem_map;
- ret = thread__insert_map(thread, map);
- if (ret)
- goto out_problem_insert;
- thread__put(thread);
- map__put(map);
- return 0;
- out_problem_insert:
- map__put(map);
- out_problem_map:
- thread__put(thread);
- 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)
- {
- struct thread *thread;
- struct map *map;
- u32 prot = 0;
- int ret = 0;
- if (dump_trace)
- perf_event__fprintf_mmap(event, stdout);
- if (sample->cpumode == PERF_RECORD_MISC_GUEST_KERNEL ||
- sample->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))
- prot = PROT_EXEC;
- map = map__new(machine, event->mmap.start,
- event->mmap.len, event->mmap.pgoff,
- NULL, prot, 0, event->mmap.filename, thread);
- if (map == NULL)
- goto out_problem_map;
- ret = thread__insert_map(thread, map);
- if (ret)
- goto out_problem_insert;
- thread__put(thread);
- map__put(map);
- return 0;
- out_problem_insert:
- map__put(map);
- out_problem_map:
- thread__put(thread);
- 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, bool lock)
- {
- struct threads *threads = machine__threads(machine, th->tid);
- if (threads->last_match == th)
- threads__set_last_match(threads, NULL);
- if (lock)
- down_write(&threads->lock);
- BUG_ON(refcount_read(&th->refcnt) == 0);
- rb_erase_cached(&th->rb_node, &threads->entries);
- RB_CLEAR_NODE(&th->rb_node);
- --threads->nr;
- /*
- * 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, &threads->dead);
- /*
- * We need to do the put here because if this is the last refcount,
- * then we will be touching the threads->dead head when removing the
- * thread.
- */
- thread__put(th);
- if (lock)
- up_write(&threads->lock);
- }
- void machine__remove_thread(struct machine *machine, struct thread *th)
- {
- return __machine__remove_thread(machine, th, true);
- }
- 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);
- bool do_maps_clone = true;
- int err = 0;
- if (dump_trace)
- perf_event__fprintf_task(event, stdout);
- /*
- * There may be an existing thread that is not actually the parent,
- * either because we are processing events out of order, or because the
- * (fork) event that would have removed the thread was lost. Assume the
- * latter case and continue on as best we can.
- */
- if (parent->pid_ != (pid_t)event->fork.ppid) {
- dump_printf("removing erroneous parent thread %d/%d\n",
- parent->pid_, parent->tid);
- machine__remove_thread(machine, parent);
- thread__put(parent);
- 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__put(thread);
- }
- thread = machine__findnew_thread(machine, event->fork.pid,
- event->fork.tid);
- /*
- * When synthesizing FORK events, we are trying to create thread
- * objects for the already running tasks on the machine.
- *
- * Normally, for a kernel FORK event, we want to clone the parent's
- * maps because that is what the kernel just did.
- *
- * But when synthesizing, this should not be done. If we do, we end up
- * with overlapping maps as we process the sythesized MMAP2 events that
- * get delivered shortly thereafter.
- *
- * Use the FORK event misc flags in an internal way to signal this
- * situation, so we can elide the map clone when appropriate.
- */
- if (event->fork.header.misc & PERF_RECORD_MISC_FORK_EXEC)
- do_maps_clone = false;
- if (thread == NULL || parent == NULL ||
- thread__fork(thread, parent, sample->time, do_maps_clone) < 0) {
- dump_printf("problem processing PERF_RECORD_FORK, skipping event.\n");
- err = -1;
- }
- thread__put(thread);
- thread__put(parent);
- return err;
- }
- 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);
- thread__put(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_NAMESPACES:
- ret = machine__process_namespaces_event(machine, event, sample); break;
- case PERF_RECORD_CGROUP:
- ret = machine__process_cgroup_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;
- case PERF_RECORD_AUX:
- ret = machine__process_aux_event(machine, event); break;
- case PERF_RECORD_ITRACE_START:
- ret = machine__process_itrace_start_event(machine, event); break;
- case PERF_RECORD_LOST_SAMPLES:
- ret = machine__process_lost_samples_event(machine, event, sample); break;
- case PERF_RECORD_SWITCH:
- case PERF_RECORD_SWITCH_CPU_WIDE:
- ret = machine__process_switch_event(machine, event); break;
- case PERF_RECORD_KSYMBOL:
- ret = machine__process_ksymbol(machine, event, sample); break;
- case PERF_RECORD_BPF_EVENT:
- ret = machine__process_bpf(machine, event, sample); break;
- case PERF_RECORD_TEXT_POKE:
- ret = machine__process_text_poke(machine, event, sample); break;
- default:
- ret = -1;
- break;
- }
- return ret;
- }
- static bool symbol__match_regex(struct symbol *sym, regex_t *regex)
- {
- if (!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, ip, &al);
- ams->addr = ip;
- ams->al_addr = al.addr;
- ams->ms.maps = al.maps;
- ams->ms.sym = al.sym;
- ams->ms.map = al.map;
- ams->phys_addr = 0;
- }
- static void ip__resolve_data(struct thread *thread,
- u8 m, struct addr_map_symbol *ams,
- u64 addr, u64 phys_addr)
- {
- struct addr_location al;
- memset(&al, 0, sizeof(al));
- thread__find_symbol(thread, m, addr, &al);
- ams->addr = addr;
- ams->al_addr = al.addr;
- ams->ms.maps = al.maps;
- ams->ms.sym = al.sym;
- ams->ms.map = al.map;
- ams->phys_addr = phys_addr;
- }
- struct mem_info *sample__resolve_mem(struct perf_sample *sample,
- struct addr_location *al)
- {
- struct mem_info *mi = mem_info__new();
- if (!mi)
- return NULL;
- ip__resolve_ams(al->thread, &mi->iaddr, sample->ip);
- ip__resolve_data(al->thread, al->cpumode, &mi->daddr,
- sample->addr, sample->phys_addr);
- mi->data_src.val = sample->data_src;
- return mi;
- }
- static char *callchain_srcline(struct map_symbol *ms, u64 ip)
- {
- struct map *map = ms->map;
- char *srcline = NULL;
- if (!map || callchain_param.key == CCKEY_FUNCTION)
- return srcline;
- srcline = srcline__tree_find(&map->dso->srclines, ip);
- if (!srcline) {
- bool show_sym = false;
- bool show_addr = callchain_param.key == CCKEY_ADDRESS;
- srcline = get_srcline(map->dso, map__rip_2objdump(map, ip),
- ms->sym, show_sym, show_addr, ip);
- srcline__tree_insert(&map->dso->srclines, ip, srcline);
- }
- return srcline;
- }
- struct iterations {
- int nr_loop_iter;
- u64 cycles;
- };
- static int add_callchain_ip(struct thread *thread,
- struct callchain_cursor *cursor,
- struct symbol **parent,
- struct addr_location *root_al,
- u8 *cpumode,
- u64 ip,
- bool branch,
- struct branch_flags *flags,
- struct iterations *iter,
- u64 branch_from)
- {
- struct map_symbol ms;
- struct addr_location al;
- int nr_loop_iter = 0;
- u64 iter_cycles = 0;
- const char *srcline = NULL;
- al.filtered = 0;
- al.sym = NULL;
- al.srcline = NULL;
- if (!cpumode) {
- thread__find_cpumode_addr_location(thread, ip, &al);
- } else {
- 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(cursor);
- return 1;
- }
- return 0;
- }
- thread__find_symbol(thread, *cpumode, ip, &al);
- }
- if (al.sym != NULL) {
- if (perf_hpp_list.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(cursor);
- }
- }
- if (symbol_conf.hide_unresolved && al.sym == NULL)
- return 0;
- if (iter) {
- nr_loop_iter = iter->nr_loop_iter;
- iter_cycles = iter->cycles;
- }
- ms.maps = al.maps;
- ms.map = al.map;
- ms.sym = al.sym;
- srcline = callchain_srcline(&ms, al.addr);
- return callchain_cursor_append(cursor, ip, &ms,
- branch, flags, nr_loop_iter,
- iter_cycles, branch_from, srcline);
- }
- 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_entry *entries = perf_sample__branch_entries(sample);
- 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, entries[i].to);
- ip__resolve_ams(al->thread, &bi[i].from, entries[i].from);
- bi[i].flags = entries[i].flags;
- }
- return bi;
- }
- static void save_iterations(struct iterations *iter,
- struct branch_entry *be, int nr)
- {
- int i;
- iter->nr_loop_iter++;
- iter->cycles = 0;
- for (i = 0; i < nr; i++)
- iter->cycles += be[i].flags.cycles;
- }
- #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,
- struct iterations *iter)
- {
- 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) {
- j = nr - (i + off);
- if (j > 0) {
- save_iterations(iter + i + off,
- l + i, off);
- memmove(iter + i, iter + i + off,
- j * sizeof(*iter));
- memmove(l + i, l + i + off,
- j * sizeof(*l));
- }
- nr -= off;
- }
- }
- }
- return nr;
- }
- static int lbr_callchain_add_kernel_ip(struct thread *thread,
- struct callchain_cursor *cursor,
- struct perf_sample *sample,
- struct symbol **parent,
- struct addr_location *root_al,
- u64 branch_from,
- bool callee, int end)
- {
- struct ip_callchain *chain = sample->callchain;
- u8 cpumode = PERF_RECORD_MISC_USER;
- int err, i;
- if (callee) {
- for (i = 0; i < end + 1; i++) {
- err = add_callchain_ip(thread, cursor, parent,
- root_al, &cpumode, chain->ips[i],
- false, NULL, NULL, branch_from);
- if (err)
- return err;
- }
- return 0;
- }
- for (i = end; i >= 0; i--) {
- err = add_callchain_ip(thread, cursor, parent,
- root_al, &cpumode, chain->ips[i],
- false, NULL, NULL, branch_from);
- if (err)
- return err;
- }
- return 0;
- }
- static void save_lbr_cursor_node(struct thread *thread,
- struct callchain_cursor *cursor,
- int idx)
- {
- struct lbr_stitch *lbr_stitch = thread->lbr_stitch;
- if (!lbr_stitch)
- return;
- if (cursor->pos == cursor->nr) {
- lbr_stitch->prev_lbr_cursor[idx].valid = false;
- return;
- }
- if (!cursor->curr)
- cursor->curr = cursor->first;
- else
- cursor->curr = cursor->curr->next;
- memcpy(&lbr_stitch->prev_lbr_cursor[idx], cursor->curr,
- sizeof(struct callchain_cursor_node));
- lbr_stitch->prev_lbr_cursor[idx].valid = true;
- cursor->pos++;
- }
- static int lbr_callchain_add_lbr_ip(struct thread *thread,
- struct callchain_cursor *cursor,
- struct perf_sample *sample,
- struct symbol **parent,
- struct addr_location *root_al,
- u64 *branch_from,
- bool callee)
- {
- struct branch_stack *lbr_stack = sample->branch_stack;
- struct branch_entry *entries = perf_sample__branch_entries(sample);
- u8 cpumode = PERF_RECORD_MISC_USER;
- int lbr_nr = lbr_stack->nr;
- struct branch_flags *flags;
- int err, i;
- u64 ip;
- /*
- * The curr and pos are not used in writing session. They are cleared
- * in callchain_cursor_commit() when the writing session is closed.
- * Using curr and pos to track the current cursor node.
- */
- if (thread->lbr_stitch) {
- cursor->curr = NULL;
- cursor->pos = cursor->nr;
- if (cursor->nr) {
- cursor->curr = cursor->first;
- for (i = 0; i < (int)(cursor->nr - 1); i++)
- cursor->curr = cursor->curr->next;
- }
- }
- if (callee) {
- /* Add LBR ip from first entries.to */
- ip = entries[0].to;
- flags = &entries[0].flags;
- *branch_from = entries[0].from;
- err = add_callchain_ip(thread, cursor, parent,
- root_al, &cpumode, ip,
- true, flags, NULL,
- *branch_from);
- if (err)
- return err;
- /*
- * The number of cursor node increases.
- * Move the current cursor node.
- * But does not need to save current cursor node for entry 0.
- * It's impossible to stitch the whole LBRs of previous sample.
- */
- if (thread->lbr_stitch && (cursor->pos != cursor->nr)) {
- if (!cursor->curr)
- cursor->curr = cursor->first;
- else
- cursor->curr = cursor->curr->next;
- cursor->pos++;
- }
- /* Add LBR ip from entries.from one by one. */
- for (i = 0; i < lbr_nr; i++) {
- ip = entries[i].from;
- flags = &entries[i].flags;
- err = add_callchain_ip(thread, cursor, parent,
- root_al, &cpumode, ip,
- true, flags, NULL,
- *branch_from);
- if (err)
- return err;
- save_lbr_cursor_node(thread, cursor, i);
- }
- return 0;
- }
- /* Add LBR ip from entries.from one by one. */
- for (i = lbr_nr - 1; i >= 0; i--) {
- ip = entries[i].from;
- flags = &entries[i].flags;
- err = add_callchain_ip(thread, cursor, parent,
- root_al, &cpumode, ip,
- true, flags, NULL,
- *branch_from);
- if (err)
- return err;
- save_lbr_cursor_node(thread, cursor, i);
- }
- /* Add LBR ip from first entries.to */
- ip = entries[0].to;
- flags = &entries[0].flags;
- *branch_from = entries[0].from;
- err = add_callchain_ip(thread, cursor, parent,
- root_al, &cpumode, ip,
- true, flags, NULL,
- *branch_from);
- if (err)
- return err;
- return 0;
- }
- static int lbr_callchain_add_stitched_lbr_ip(struct thread *thread,
- struct callchain_cursor *cursor)
- {
- struct lbr_stitch *lbr_stitch = thread->lbr_stitch;
- struct callchain_cursor_node *cnode;
- struct stitch_list *stitch_node;
- int err;
- list_for_each_entry(stitch_node, &lbr_stitch->lists, node) {
- cnode = &stitch_node->cursor;
- err = callchain_cursor_append(cursor, cnode->ip,
- &cnode->ms,
- cnode->branch,
- &cnode->branch_flags,
- cnode->nr_loop_iter,
- cnode->iter_cycles,
- cnode->branch_from,
- cnode->srcline);
- if (err)
- return err;
- }
- return 0;
- }
- static struct stitch_list *get_stitch_node(struct thread *thread)
- {
- struct lbr_stitch *lbr_stitch = thread->lbr_stitch;
- struct stitch_list *stitch_node;
- if (!list_empty(&lbr_stitch->free_lists)) {
- stitch_node = list_first_entry(&lbr_stitch->free_lists,
- struct stitch_list, node);
- list_del(&stitch_node->node);
- return stitch_node;
- }
- return malloc(sizeof(struct stitch_list));
- }
- static bool has_stitched_lbr(struct thread *thread,
- struct perf_sample *cur,
- struct perf_sample *prev,
- unsigned int max_lbr,
- bool callee)
- {
- struct branch_stack *cur_stack = cur->branch_stack;
- struct branch_entry *cur_entries = perf_sample__branch_entries(cur);
- struct branch_stack *prev_stack = prev->branch_stack;
- struct branch_entry *prev_entries = perf_sample__branch_entries(prev);
- struct lbr_stitch *lbr_stitch = thread->lbr_stitch;
- int i, j, nr_identical_branches = 0;
- struct stitch_list *stitch_node;
- u64 cur_base, distance;
- if (!cur_stack || !prev_stack)
- return false;
- /* Find the physical index of the base-of-stack for current sample. */
- cur_base = max_lbr - cur_stack->nr + cur_stack->hw_idx + 1;
- distance = (prev_stack->hw_idx > cur_base) ? (prev_stack->hw_idx - cur_base) :
- (max_lbr + prev_stack->hw_idx - cur_base);
- /* Previous sample has shorter stack. Nothing can be stitched. */
- if (distance + 1 > prev_stack->nr)
- return false;
- /*
- * Check if there are identical LBRs between two samples.
- * Identicall LBRs must have same from, to and flags values. Also,
- * they have to be saved in the same LBR registers (same physical
- * index).
- *
- * Starts from the base-of-stack of current sample.
- */
- for (i = distance, j = cur_stack->nr - 1; (i >= 0) && (j >= 0); i--, j--) {
- if ((prev_entries[i].from != cur_entries[j].from) ||
- (prev_entries[i].to != cur_entries[j].to) ||
- (prev_entries[i].flags.value != cur_entries[j].flags.value))
- break;
- nr_identical_branches++;
- }
- if (!nr_identical_branches)
- return false;
- /*
- * Save the LBRs between the base-of-stack of previous sample
- * and the base-of-stack of current sample into lbr_stitch->lists.
- * These LBRs will be stitched later.
- */
- for (i = prev_stack->nr - 1; i > (int)distance; i--) {
- if (!lbr_stitch->prev_lbr_cursor[i].valid)
- continue;
- stitch_node = get_stitch_node(thread);
- if (!stitch_node)
- return false;
- memcpy(&stitch_node->cursor, &lbr_stitch->prev_lbr_cursor[i],
- sizeof(struct callchain_cursor_node));
- if (callee)
- list_add(&stitch_node->node, &lbr_stitch->lists);
- else
- list_add_tail(&stitch_node->node, &lbr_stitch->lists);
- }
- return true;
- }
- static bool alloc_lbr_stitch(struct thread *thread, unsigned int max_lbr)
- {
- if (thread->lbr_stitch)
- return true;
- thread->lbr_stitch = zalloc(sizeof(*thread->lbr_stitch));
- if (!thread->lbr_stitch)
- goto err;
- thread->lbr_stitch->prev_lbr_cursor = calloc(max_lbr + 1, sizeof(struct callchain_cursor_node));
- if (!thread->lbr_stitch->prev_lbr_cursor)
- goto free_lbr_stitch;
- INIT_LIST_HEAD(&thread->lbr_stitch->lists);
- INIT_LIST_HEAD(&thread->lbr_stitch->free_lists);
- return true;
- free_lbr_stitch:
- zfree(&thread->lbr_stitch);
- err:
- pr_warning("Failed to allocate space for stitched LBRs. Disable LBR stitch\n");
- thread->lbr_stitch_enable = false;
- return false;
- }
- /*
- * 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 callchain_cursor *cursor,
- struct perf_sample *sample,
- struct symbol **parent,
- struct addr_location *root_al,
- int max_stack,
- unsigned int max_lbr)
- {
- bool callee = (callchain_param.order == ORDER_CALLEE);
- struct ip_callchain *chain = sample->callchain;
- int chain_nr = min(max_stack, (int)chain->nr), i;
- struct lbr_stitch *lbr_stitch;
- bool stitched_lbr = false;
- u64 branch_from = 0;
- int err;
- 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)
- return 0;
- if (thread->lbr_stitch_enable && !sample->no_hw_idx &&
- (max_lbr > 0) && alloc_lbr_stitch(thread, max_lbr)) {
- lbr_stitch = thread->lbr_stitch;
- stitched_lbr = has_stitched_lbr(thread, sample,
- &lbr_stitch->prev_sample,
- max_lbr, callee);
- if (!stitched_lbr && !list_empty(&lbr_stitch->lists)) {
- list_replace_init(&lbr_stitch->lists,
- &lbr_stitch->free_lists);
- }
- memcpy(&lbr_stitch->prev_sample, sample, sizeof(*sample));
- }
- if (callee) {
- /* Add kernel ip */
- err = lbr_callchain_add_kernel_ip(thread, cursor, sample,
- parent, root_al, branch_from,
- true, i);
- if (err)
- goto error;
- err = lbr_callchain_add_lbr_ip(thread, cursor, sample, parent,
- root_al, &branch_from, true);
- if (err)
- goto error;
- if (stitched_lbr) {
- err = lbr_callchain_add_stitched_lbr_ip(thread, cursor);
- if (err)
- goto error;
- }
- } else {
- if (stitched_lbr) {
- err = lbr_callchain_add_stitched_lbr_ip(thread, cursor);
- if (err)
- goto error;
- }
- err = lbr_callchain_add_lbr_ip(thread, cursor, sample, parent,
- root_al, &branch_from, false);
- if (err)
- goto error;
- /* Add kernel ip */
- err = lbr_callchain_add_kernel_ip(thread, cursor, sample,
- parent, root_al, branch_from,
- false, i);
- if (err)
- goto error;
- }
- return 1;
- error:
- return (err < 0) ? err : 0;
- }
- static int find_prev_cpumode(struct ip_callchain *chain, struct thread *thread,
- struct callchain_cursor *cursor,
- struct symbol **parent,
- struct addr_location *root_al,
- u8 *cpumode, int ent)
- {
- int err = 0;
- while (--ent >= 0) {
- u64 ip = chain->ips[ent];
- if (ip >= PERF_CONTEXT_MAX) {
- err = add_callchain_ip(thread, cursor, parent,
- root_al, cpumode, ip,
- false, NULL, NULL, 0);
- break;
- }
- }
- return err;
- }
- static int thread__resolve_callchain_sample(struct thread *thread,
- struct callchain_cursor *cursor,
- struct 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 branch_entry *entries = perf_sample__branch_entries(sample);
- struct ip_callchain *chain = sample->callchain;
- int chain_nr = 0;
- u8 cpumode = PERF_RECORD_MISC_USER;
- int i, j, err, nr_entries;
- int skip_idx = -1;
- int first_call = 0;
- if (chain)
- chain_nr = chain->nr;
- if (evsel__has_branch_callstack(evsel)) {
- struct perf_env *env = evsel__env(evsel);
- err = resolve_lbr_callchain_sample(thread, cursor, sample, parent,
- root_al, max_stack,
- !env ? 0 : env->max_branches);
- if (err)
- return (err < 0) ? err : 0;
- }
- /*
- * Based on DWARF debug information, some architectures skip
- * a callchain entry saved by the kernel.
- */
- 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];
- struct iterations iter[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] = entries[i];
- if (chain == NULL)
- continue;
- /*
- * 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] = entries[branch->nr - i - 1];
- }
- memset(iter, 0, sizeof(struct iterations) * nr);
- nr = remove_loops(be, nr, iter);
- for (i = 0; i < nr; i++) {
- err = add_callchain_ip(thread, cursor, parent,
- root_al,
- NULL, be[i].to,
- true, &be[i].flags,
- NULL, be[i].from);
- if (!err)
- err = add_callchain_ip(thread, cursor, parent, root_al,
- NULL, be[i].from,
- true, &be[i].flags,
- &iter[i], 0);
- if (err == -EINVAL)
- break;
- if (err)
- return err;
- }
- if (chain_nr == 0)
- return 0;
- chain_nr -= nr;
- }
- check_calls:
- if (chain && callchain_param.order != ORDER_CALLEE) {
- err = find_prev_cpumode(chain, thread, cursor, parent, root_al,
- &cpumode, chain->nr - first_call);
- if (err)
- return (err < 0) ? err : 0;
- }
- for (i = first_call, nr_entries = 0;
- i < chain_nr && nr_entries < max_stack; 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];
- if (ip < PERF_CONTEXT_MAX)
- ++nr_entries;
- else if (callchain_param.order != ORDER_CALLEE) {
- err = find_prev_cpumode(chain, thread, cursor, parent,
- root_al, &cpumode, j);
- if (err)
- return (err < 0) ? err : 0;
- continue;
- }
- err = add_callchain_ip(thread, cursor, parent,
- root_al, &cpumode, ip,
- false, NULL, NULL, 0);
- if (err)
- return (err < 0) ? err : 0;
- }
- return 0;
- }
- static int append_inlines(struct callchain_cursor *cursor, struct map_symbol *ms, u64 ip)
- {
- struct symbol *sym = ms->sym;
- struct map *map = ms->map;
- struct inline_node *inline_node;
- struct inline_list *ilist;
- u64 addr;
- int ret = 1;
- if (!symbol_conf.inline_name || !map || !sym)
- return ret;
- addr = map__map_ip(map, ip);
- addr = map__rip_2objdump(map, addr);
- inline_node = inlines__tree_find(&map->dso->inlined_nodes, addr);
- if (!inline_node) {
- inline_node = dso__parse_addr_inlines(map->dso, addr, sym);
- if (!inline_node)
- return ret;
- inlines__tree_insert(&map->dso->inlined_nodes, inline_node);
- }
- list_for_each_entry(ilist, &inline_node->val, list) {
- struct map_symbol ilist_ms = {
- .maps = ms->maps,
- .map = map,
- .sym = ilist->symbol,
- };
- ret = callchain_cursor_append(cursor, ip, &ilist_ms, false,
- NULL, 0, 0, 0, ilist->srcline);
- if (ret != 0)
- return ret;
- }
- return ret;
- }
- static int unwind_entry(struct unwind_entry *entry, void *arg)
- {
- struct callchain_cursor *cursor = arg;
- const char *srcline = NULL;
- u64 addr = entry->ip;
- if (symbol_conf.hide_unresolved && entry->ms.sym == NULL)
- return 0;
- if (append_inlines(cursor, &entry->ms, entry->ip) == 0)
- return 0;
- /*
- * Convert entry->ip from a virtual address to an offset in
- * its corresponding binary.
- */
- if (entry->ms.map)
- addr = map__map_ip(entry->ms.map, entry->ip);
- srcline = callchain_srcline(&entry->ms, addr);
- return callchain_cursor_append(cursor, entry->ip, &entry->ms,
- false, NULL, 0, 0, 0, srcline);
- }
- static int thread__resolve_callchain_unwind(struct thread *thread,
- struct callchain_cursor *cursor,
- struct evsel *evsel,
- struct perf_sample *sample,
- int max_stack)
- {
- /* Can we do dwarf post unwind? */
- if (!((evsel->core.attr.sample_type & PERF_SAMPLE_REGS_USER) &&
- (evsel->core.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, cursor,
- thread, sample, max_stack);
- }
- int thread__resolve_callchain(struct thread *thread,
- struct callchain_cursor *cursor,
- struct evsel *evsel,
- struct perf_sample *sample,
- struct symbol **parent,
- struct addr_location *root_al,
- int max_stack)
- {
- int ret = 0;
- callchain_cursor_reset(cursor);
- if (callchain_param.order == ORDER_CALLEE) {
- ret = thread__resolve_callchain_sample(thread, cursor,
- evsel, sample,
- parent, root_al,
- max_stack);
- if (ret)
- return ret;
- ret = thread__resolve_callchain_unwind(thread, cursor,
- evsel, sample,
- max_stack);
- } else {
- ret = thread__resolve_callchain_unwind(thread, cursor,
- evsel, sample,
- max_stack);
- if (ret)
- return ret;
- ret = thread__resolve_callchain_sample(thread, cursor,
- evsel, sample,
- parent, root_al,
- max_stack);
- }
- return ret;
- }
- int machine__for_each_thread(struct machine *machine,
- int (*fn)(struct thread *thread, void *p),
- void *priv)
- {
- struct threads *threads;
- struct rb_node *nd;
- struct thread *thread;
- int rc = 0;
- int i;
- for (i = 0; i < THREADS__TABLE_SIZE; i++) {
- threads = &machine->threads[i];
- for (nd = rb_first_cached(&threads->entries); 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, &threads->dead, node) {
- rc = fn(thread, priv);
- if (rc != 0)
- return rc;
- }
- }
- return rc;
- }
- int machines__for_each_thread(struct machines *machines,
- int (*fn)(struct thread *thread, void *p),
- void *priv)
- {
- struct rb_node *nd;
- int rc = 0;
- rc = machine__for_each_thread(&machines->host, fn, priv);
- if (rc != 0)
- return rc;
- for (nd = rb_first_cached(&machines->guests); nd; nd = rb_next(nd)) {
- struct machine *machine = rb_entry(nd, struct machine, rb_node);
- rc = machine__for_each_thread(machine, fn, priv);
- if (rc != 0)
- return rc;
- }
- return rc;
- }
- pid_t machine__get_current_tid(struct machine *machine, int cpu)
- {
- int nr_cpus = min(machine->env->nr_cpus_avail, MAX_NR_CPUS);
- if (cpu < 0 || cpu >= 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;
- int nr_cpus = min(machine->env->nr_cpus_avail, MAX_NR_CPUS);
- if (cpu < 0)
- return -EINVAL;
- if (!machine->current_tid) {
- int i;
- machine->current_tid = calloc(nr_cpus, sizeof(pid_t));
- if (!machine->current_tid)
- return -ENOMEM;
- for (i = 0; i < nr_cpus; i++)
- machine->current_tid[i] = -1;
- }
- if (cpu >= 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;
- thread__put(thread);
- return 0;
- }
- /*
- * Compares the raw arch string. N.B. see instead perf_env__arch() if a
- * normalized arch is needed.
- */
- bool machine__is(struct machine *machine, const char *arch)
- {
- return machine && !strcmp(perf_env__raw_arch(machine->env), arch);
- }
- int machine__nr_cpus_avail(struct machine *machine)
- {
- return machine ? perf_env__nr_cpus_avail(machine->env) : 0;
- }
- int machine__get_kernel_start(struct machine *machine)
- {
- struct map *map = machine__kernel_map(machine);
- 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);
- /*
- * On x86_64, PTI entry trampolines are less than the
- * start of kernel text, but still above 2^63. So leave
- * kernel_start = 1ULL << 63 for x86_64.
- */
- if (!err && !machine__is(machine, "x86_64"))
- machine->kernel_start = map->start;
- }
- return err;
- }
- u8 machine__addr_cpumode(struct machine *machine, u8 cpumode, u64 addr)
- {
- u8 addr_cpumode = cpumode;
- bool kernel_ip;
- if (!machine->single_address_space)
- goto out;
- kernel_ip = machine__kernel_ip(machine, addr);
- switch (cpumode) {
- case PERF_RECORD_MISC_KERNEL:
- case PERF_RECORD_MISC_USER:
- addr_cpumode = kernel_ip ? PERF_RECORD_MISC_KERNEL :
- PERF_RECORD_MISC_USER;
- break;
- case PERF_RECORD_MISC_GUEST_KERNEL:
- case PERF_RECORD_MISC_GUEST_USER:
- addr_cpumode = kernel_ip ? PERF_RECORD_MISC_GUEST_KERNEL :
- PERF_RECORD_MISC_GUEST_USER;
- break;
- default:
- break;
- }
- out:
- return addr_cpumode;
- }
- struct dso *machine__findnew_dso_id(struct machine *machine, const char *filename, struct dso_id *id)
- {
- return dsos__findnew_id(&machine->dsos, filename, id);
- }
- struct dso *machine__findnew_dso(struct machine *machine, const char *filename)
- {
- return machine__findnew_dso_id(machine, filename, NULL);
- }
- char *machine__resolve_kernel_addr(void *vmachine, unsigned long long *addrp, char **modp)
- {
- struct machine *machine = vmachine;
- struct map *map;
- struct symbol *sym = machine__find_kernel_symbol(machine, *addrp, &map);
- if (sym == NULL)
- return NULL;
- *modp = __map__is_kmodule(map) ? (char *)map->dso->short_name : NULL;
- *addrp = map->unmap_ip(map, sym->start);
- return sym->name;
- }
- int machine__for_each_dso(struct machine *machine, machine__dso_t fn, void *priv)
- {
- struct dso *pos;
- int err = 0;
- list_for_each_entry(pos, &machine->dsos.head, node) {
- if (fn(pos, machine, priv))
- err = -1;
- }
- return err;
- }
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