mirror of
https://github.com/torvalds/linux.git
synced 2024-12-06 02:52:22 +00:00
977c7a6d1e
Since commit1fb87b8e95
("perf machine: Don't search for active kernel start in __machine__create_kernel_maps"), the __machine__create_kernel_maps() just create a map what start and end are both zero. Though the address will be updated later, the order of map in the rbtree may be incorrect. The commitee05d21791
("perf machine: Set main kernel end address properly") fixed the logic in machine__create_kernel_maps(), but it's still wrong in function machine__process_kernel_mmap_event(). To reproduce this issue, we need an environment which the module address is before the kernel text segment. I tested it on an aarch64 machine with kernel 4.19.25: [root@localhost hulk]# grep _stext /proc/kallsyms ffff000008081000 T _stext [root@localhost hulk]# grep _etext /proc/kallsyms ffff000009780000 R _etext [root@localhost hulk]# tail /proc/modules hisi_sas_v2_hw 77824 0 - Live 0xffff00000191d000 nvme_core 126976 7 nvme, Live 0xffff0000018b6000 mdio 20480 1 ixgbe, Live 0xffff0000018ab000 hisi_sas_main 106496 1 hisi_sas_v2_hw, Live 0xffff000001861000 hns_mdio 20480 2 - Live 0xffff000001822000 hnae 28672 3 hns_dsaf,hns_enet_drv, Live 0xffff000001815000 dm_mirror 40960 0 - Live 0xffff000001804000 dm_region_hash 32768 1 dm_mirror, Live 0xffff0000017f5000 dm_log 32768 2 dm_mirror,dm_region_hash, Live 0xffff0000017e7000 dm_mod 315392 17 dm_mirror,dm_log, Live 0xffff000001780000 [root@localhost hulk]# Before fix: [root@localhost bin]# perf record sleep 3 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.011 MB perf.data (9 samples) ] [root@localhost bin]# perf buildid-list -i perf.data 4c4e46c971ca935f781e603a09b52a92e8bdfee8 [vdso] [root@localhost bin]# perf buildid-list -i perf.data -H 0000000000000000000000000000000000000000 /proc/kcore [root@localhost bin]# After fix: [root@localhost tools]# ./perf/perf record sleep 3 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.011 MB perf.data (9 samples) ] [root@localhost tools]# ./perf/perf buildid-list -i perf.data 28a6c690262896dbd1b5e1011ed81623e6db0610 [kernel.kallsyms] 106c14ce6e4acea3453e484dc604d66666f08a2f [vdso] [root@localhost tools]# ./perf/perf buildid-list -i perf.data -H 28a6c690262896dbd1b5e1011ed81623e6db0610 /proc/kcore Signed-off-by: Wei Li <liwei391@huawei.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Hanjun Guo <guohanjun@huawei.com> Cc: Kim Phillips <kim.phillips@arm.com> Cc: Li Bin <huawei.libin@huawei.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20190228092003.34071-1-liwei391@huawei.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2714 lines
64 KiB
C
2714 lines
64 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <dirent.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <regex.h>
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#include "callchain.h"
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#include "debug.h"
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#include "event.h"
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#include "evsel.h"
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#include "hist.h"
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#include "machine.h"
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#include "map.h"
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#include "symbol.h"
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#include "sort.h"
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#include "strlist.h"
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#include "thread.h"
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#include "vdso.h"
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#include <stdbool.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "unwind.h"
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#include "linux/hash.h"
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#include "asm/bug.h"
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#include "bpf-event.h"
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#include "sane_ctype.h"
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#include <symbol/kallsyms.h>
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#include <linux/mman.h>
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static void __machine__remove_thread(struct machine *machine, struct thread *th, bool lock);
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static void dsos__init(struct dsos *dsos)
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{
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INIT_LIST_HEAD(&dsos->head);
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dsos->root = RB_ROOT;
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init_rwsem(&dsos->lock);
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}
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static void machine__threads_init(struct machine *machine)
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{
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int i;
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for (i = 0; i < THREADS__TABLE_SIZE; i++) {
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struct threads *threads = &machine->threads[i];
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threads->entries = RB_ROOT_CACHED;
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init_rwsem(&threads->lock);
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threads->nr = 0;
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INIT_LIST_HEAD(&threads->dead);
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threads->last_match = NULL;
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}
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}
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static int machine__set_mmap_name(struct machine *machine)
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{
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if (machine__is_host(machine))
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machine->mmap_name = strdup("[kernel.kallsyms]");
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else if (machine__is_default_guest(machine))
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machine->mmap_name = strdup("[guest.kernel.kallsyms]");
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else if (asprintf(&machine->mmap_name, "[guest.kernel.kallsyms.%d]",
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machine->pid) < 0)
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machine->mmap_name = NULL;
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return machine->mmap_name ? 0 : -ENOMEM;
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}
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int machine__init(struct machine *machine, const char *root_dir, pid_t pid)
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{
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int err = -ENOMEM;
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memset(machine, 0, sizeof(*machine));
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map_groups__init(&machine->kmaps, machine);
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RB_CLEAR_NODE(&machine->rb_node);
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dsos__init(&machine->dsos);
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machine__threads_init(machine);
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machine->vdso_info = NULL;
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machine->env = NULL;
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machine->pid = pid;
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machine->id_hdr_size = 0;
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machine->kptr_restrict_warned = false;
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machine->comm_exec = false;
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machine->kernel_start = 0;
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machine->vmlinux_map = NULL;
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machine->root_dir = strdup(root_dir);
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if (machine->root_dir == NULL)
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return -ENOMEM;
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if (machine__set_mmap_name(machine))
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goto out;
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if (pid != HOST_KERNEL_ID) {
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struct thread *thread = machine__findnew_thread(machine, -1,
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pid);
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char comm[64];
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if (thread == NULL)
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goto out;
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snprintf(comm, sizeof(comm), "[guest/%d]", pid);
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thread__set_comm(thread, comm, 0);
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thread__put(thread);
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}
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machine->current_tid = NULL;
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err = 0;
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out:
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if (err) {
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zfree(&machine->root_dir);
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zfree(&machine->mmap_name);
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}
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return 0;
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}
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struct machine *machine__new_host(void)
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{
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struct machine *machine = malloc(sizeof(*machine));
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if (machine != NULL) {
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machine__init(machine, "", HOST_KERNEL_ID);
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if (machine__create_kernel_maps(machine) < 0)
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goto out_delete;
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}
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return machine;
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out_delete:
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free(machine);
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return NULL;
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}
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struct machine *machine__new_kallsyms(void)
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{
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struct machine *machine = machine__new_host();
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/*
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* FIXME:
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* 1) We should switch to machine__load_kallsyms(), i.e. not explicitly
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* ask for not using the kcore parsing code, once this one is fixed
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* to create a map per module.
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*/
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if (machine && machine__load_kallsyms(machine, "/proc/kallsyms") <= 0) {
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machine__delete(machine);
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machine = NULL;
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}
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return machine;
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}
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static void dsos__purge(struct dsos *dsos)
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{
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struct dso *pos, *n;
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down_write(&dsos->lock);
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list_for_each_entry_safe(pos, n, &dsos->head, node) {
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RB_CLEAR_NODE(&pos->rb_node);
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pos->root = NULL;
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list_del_init(&pos->node);
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dso__put(pos);
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}
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up_write(&dsos->lock);
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}
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static void dsos__exit(struct dsos *dsos)
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{
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dsos__purge(dsos);
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exit_rwsem(&dsos->lock);
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}
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void machine__delete_threads(struct machine *machine)
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{
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struct rb_node *nd;
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int i;
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for (i = 0; i < THREADS__TABLE_SIZE; i++) {
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struct threads *threads = &machine->threads[i];
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down_write(&threads->lock);
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nd = rb_first_cached(&threads->entries);
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while (nd) {
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struct thread *t = rb_entry(nd, struct thread, rb_node);
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nd = rb_next(nd);
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__machine__remove_thread(machine, t, false);
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}
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up_write(&threads->lock);
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}
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}
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void machine__exit(struct machine *machine)
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{
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int i;
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if (machine == NULL)
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return;
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machine__destroy_kernel_maps(machine);
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map_groups__exit(&machine->kmaps);
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dsos__exit(&machine->dsos);
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machine__exit_vdso(machine);
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zfree(&machine->root_dir);
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zfree(&machine->mmap_name);
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zfree(&machine->current_tid);
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for (i = 0; i < THREADS__TABLE_SIZE; i++) {
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struct threads *threads = &machine->threads[i];
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exit_rwsem(&threads->lock);
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}
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}
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void machine__delete(struct machine *machine)
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{
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if (machine) {
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machine__exit(machine);
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free(machine);
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}
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}
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void machines__init(struct machines *machines)
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{
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machine__init(&machines->host, "", HOST_KERNEL_ID);
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machines->guests = RB_ROOT_CACHED;
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}
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void machines__exit(struct machines *machines)
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{
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machine__exit(&machines->host);
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/* XXX exit guest */
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}
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struct machine *machines__add(struct machines *machines, pid_t pid,
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const char *root_dir)
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{
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struct rb_node **p = &machines->guests.rb_root.rb_node;
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struct rb_node *parent = NULL;
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struct machine *pos, *machine = malloc(sizeof(*machine));
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bool leftmost = true;
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if (machine == NULL)
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return NULL;
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if (machine__init(machine, root_dir, pid) != 0) {
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free(machine);
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return NULL;
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}
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while (*p != NULL) {
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parent = *p;
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pos = rb_entry(parent, struct machine, rb_node);
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if (pid < pos->pid)
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p = &(*p)->rb_left;
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else {
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p = &(*p)->rb_right;
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leftmost = false;
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}
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}
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rb_link_node(&machine->rb_node, parent, p);
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rb_insert_color_cached(&machine->rb_node, &machines->guests, leftmost);
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return machine;
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}
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void machines__set_comm_exec(struct machines *machines, bool comm_exec)
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{
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struct rb_node *nd;
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machines->host.comm_exec = comm_exec;
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for (nd = rb_first_cached(&machines->guests); nd; nd = rb_next(nd)) {
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struct machine *machine = rb_entry(nd, struct machine, rb_node);
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machine->comm_exec = comm_exec;
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}
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}
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struct machine *machines__find(struct machines *machines, pid_t pid)
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{
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struct rb_node **p = &machines->guests.rb_root.rb_node;
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struct rb_node *parent = NULL;
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struct machine *machine;
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struct machine *default_machine = NULL;
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if (pid == HOST_KERNEL_ID)
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return &machines->host;
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while (*p != NULL) {
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parent = *p;
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machine = rb_entry(parent, struct machine, rb_node);
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if (pid < machine->pid)
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p = &(*p)->rb_left;
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else if (pid > machine->pid)
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p = &(*p)->rb_right;
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else
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return machine;
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if (!machine->pid)
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default_machine = machine;
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}
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return default_machine;
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}
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struct machine *machines__findnew(struct machines *machines, pid_t pid)
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{
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char path[PATH_MAX];
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const char *root_dir = "";
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struct machine *machine = machines__find(machines, pid);
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if (machine && (machine->pid == pid))
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goto out;
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if ((pid != HOST_KERNEL_ID) &&
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(pid != DEFAULT_GUEST_KERNEL_ID) &&
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(symbol_conf.guestmount)) {
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sprintf(path, "%s/%d", symbol_conf.guestmount, pid);
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if (access(path, R_OK)) {
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static struct strlist *seen;
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if (!seen)
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seen = strlist__new(NULL, NULL);
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if (!strlist__has_entry(seen, path)) {
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pr_err("Can't access file %s\n", path);
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strlist__add(seen, path);
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}
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machine = NULL;
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goto out;
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}
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root_dir = path;
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}
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machine = machines__add(machines, pid, root_dir);
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out:
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return machine;
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}
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void machines__process_guests(struct machines *machines,
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machine__process_t process, void *data)
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{
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struct rb_node *nd;
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for (nd = rb_first_cached(&machines->guests); nd; nd = rb_next(nd)) {
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struct machine *pos = rb_entry(nd, struct machine, rb_node);
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process(pos, data);
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}
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}
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void machines__set_id_hdr_size(struct machines *machines, u16 id_hdr_size)
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{
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struct rb_node *node;
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struct machine *machine;
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machines->host.id_hdr_size = id_hdr_size;
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for (node = rb_first_cached(&machines->guests); node;
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node = rb_next(node)) {
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machine = rb_entry(node, struct machine, rb_node);
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machine->id_hdr_size = id_hdr_size;
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}
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return;
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}
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static void machine__update_thread_pid(struct machine *machine,
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struct thread *th, pid_t pid)
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{
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struct thread *leader;
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if (pid == th->pid_ || pid == -1 || th->pid_ != -1)
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return;
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th->pid_ = pid;
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if (th->pid_ == th->tid)
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return;
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leader = __machine__findnew_thread(machine, th->pid_, th->pid_);
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if (!leader)
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goto out_err;
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if (!leader->mg)
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leader->mg = map_groups__new(machine);
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if (!leader->mg)
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goto out_err;
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if (th->mg == leader->mg)
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return;
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if (th->mg) {
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/*
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* Maps are created from MMAP events which provide the pid and
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* tid. Consequently there never should be any maps on a thread
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* with an unknown pid. Just print an error if there are.
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*/
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if (!map_groups__empty(th->mg))
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pr_err("Discarding thread maps for %d:%d\n",
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th->pid_, th->tid);
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map_groups__put(th->mg);
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}
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th->mg = map_groups__get(leader->mg);
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out_put:
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thread__put(leader);
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return;
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out_err:
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pr_err("Failed to join map groups for %d:%d\n", th->pid_, th->tid);
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goto out_put;
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}
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|
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/*
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* Front-end cache - TID lookups come in blocks,
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* so most of the time we dont have to look up
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* the full rbtree:
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*/
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static struct thread*
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__threads__get_last_match(struct threads *threads, struct machine *machine,
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int pid, int tid)
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{
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struct thread *th;
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th = threads->last_match;
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if (th != NULL) {
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if (th->tid == tid) {
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machine__update_thread_pid(machine, th, pid);
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return thread__get(th);
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}
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threads->last_match = NULL;
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}
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return NULL;
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}
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static struct thread*
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threads__get_last_match(struct threads *threads, struct machine *machine,
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int pid, int tid)
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{
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struct thread *th = NULL;
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|
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if (perf_singlethreaded)
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th = __threads__get_last_match(threads, machine, pid, tid);
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return th;
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}
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static void
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__threads__set_last_match(struct threads *threads, struct thread *th)
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{
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threads->last_match = th;
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}
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|
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static void
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threads__set_last_match(struct threads *threads, struct thread *th)
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{
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if (perf_singlethreaded)
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__threads__set_last_match(threads, th);
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}
|
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|
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/*
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* Caller must eventually drop thread->refcnt returned with a successful
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* lookup/new thread inserted.
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*/
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static struct thread *____machine__findnew_thread(struct machine *machine,
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struct threads *threads,
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pid_t pid, pid_t tid,
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bool create)
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{
|
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struct rb_node **p = &threads->entries.rb_root.rb_node;
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struct rb_node *parent = NULL;
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struct thread *th;
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bool leftmost = true;
|
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|
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th = threads__get_last_match(threads, machine, pid, tid);
|
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if (th)
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return th;
|
|
|
|
while (*p != NULL) {
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parent = *p;
|
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th = rb_entry(parent, struct thread, rb_node);
|
|
|
|
if (th->tid == tid) {
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|
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 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_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_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;
|
|
}
|
|
|
|
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 :%" PRIu64 "\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__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;
|
|
|
|
map = map_groups__find(&machine->kmaps, event->ksymbol_event.addr);
|
|
if (!map) {
|
|
map = dso__new_map(event->ksymbol_event.name);
|
|
if (!map)
|
|
return -ENOMEM;
|
|
|
|
map->start = event->ksymbol_event.addr;
|
|
map->pgoff = map->start;
|
|
map->end = map->start + event->ksymbol_event.len;
|
|
map_groups__insert(&machine->kmaps, map);
|
|
}
|
|
|
|
sym = symbol__new(event->ksymbol_event.addr, event->ksymbol_event.len,
|
|
0, 0, event->ksymbol_event.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 map *map;
|
|
|
|
map = map_groups__find(&machine->kmaps, event->ksymbol_event.addr);
|
|
if (map)
|
|
map_groups__remove(&machine->kmaps, map);
|
|
|
|
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_event.flags & PERF_RECORD_KSYMBOL_FLAGS_UNREGISTER)
|
|
return machine__process_ksymbol_unregister(machine, event,
|
|
sample);
|
|
return machine__process_ksymbol_register(machine, event, sample);
|
|
}
|
|
|
|
static void dso__adjust_kmod_long_name(struct dso *dso, const char *filename)
|
|
{
|
|
const char *dup_filename;
|
|
|
|
if (!filename || !dso || !dso->long_name)
|
|
return;
|
|
if (dso->long_name[0] != '[')
|
|
return;
|
|
if (!strchr(filename, '/'))
|
|
return;
|
|
|
|
dup_filename = strdup(filename);
|
|
if (!dup_filename)
|
|
return;
|
|
|
|
dso__set_long_name(dso, dup_filename, true);
|
|
}
|
|
|
|
struct map *machine__findnew_module_map(struct machine *machine, u64 start,
|
|
const char *filename)
|
|
{
|
|
struct map *map = NULL;
|
|
struct dso *dso = NULL;
|
|
struct kmod_path m;
|
|
|
|
if (kmod_path__parse_name(&m, filename))
|
|
return NULL;
|
|
|
|
map = map_groups__find_by_name(&machine->kmaps, m.name);
|
|
if (map) {
|
|
/*
|
|
* If the map's dso is an offline module, give dso__load()
|
|
* a chance to find the file path of that module by fixing
|
|
* long_name.
|
|
*/
|
|
dso__adjust_kmod_long_name(map->dso, filename);
|
|
goto out;
|
|
}
|
|
|
|
dso = machine__findnew_module_dso(machine, &m, filename);
|
|
if (dso == NULL)
|
|
goto out;
|
|
|
|
map = map__new2(start, dso);
|
|
if (map == NULL)
|
|
goto out;
|
|
|
|
map_groups__insert(&machine->kmaps, map);
|
|
|
|
/* Put the map here because map_groups__insert alread got it */
|
|
map__put(map);
|
|
out:
|
|
/* put the dso here, corresponding to machine__findnew_module_dso */
|
|
dso__put(dso);
|
|
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.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_map(machine)->dso;
|
|
|
|
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_TYPE_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_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;
|
|
};
|
|
|
|
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)
|
|
{
|
|
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;
|
|
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);
|
|
|
|
kmap->kmaps = &machine->kmaps;
|
|
strlcpy(kmap->name, xm->name, KMAP_NAME_LEN);
|
|
|
|
map_groups__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 map_groups *kmaps = &machine->kmaps;
|
|
struct maps *maps = &kmaps->maps;
|
|
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.
|
|
*/
|
|
for (map = maps__first(maps); map; map = map__next(map)) {
|
|
struct kmap *kmap = __map__kmap(map);
|
|
struct map *dest_map;
|
|
|
|
if (!kmap || !is_entry_trampoline(kmap->name))
|
|
continue;
|
|
|
|
dest_map = map_groups__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)
|
|
{
|
|
struct kmap *kmap;
|
|
struct map *map;
|
|
|
|
/* 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;
|
|
map = machine__kernel_map(machine);
|
|
kmap = map__kmap(map);
|
|
if (!kmap)
|
|
return -1;
|
|
|
|
kmap->kmaps = &machine->kmaps;
|
|
map_groups__insert(&machine->kmaps, 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);
|
|
map_groups__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.
|
|
*/
|
|
map_groups__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;
|
|
|
|
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)
|
|
{
|
|
char *long_name;
|
|
struct map *map = map_groups__find_by_name(mg, 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 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);
|
|
}
|
|
int __weak arch__fix_module_text_start(u64 *start __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, name) < 0)
|
|
return -1;
|
|
|
|
map = machine__findnew_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);
|
|
map_groups__remove(&machine->kmaps, map);
|
|
|
|
machine__set_kernel_mmap(machine, start, end);
|
|
|
|
map_groups__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 addr = 0;
|
|
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, &addr)) {
|
|
if (name &&
|
|
map__set_kallsyms_ref_reloc_sym(machine->vmlinux_map, name, addr)) {
|
|
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, addr, ~0ULL);
|
|
}
|
|
|
|
if (machine__create_extra_kernel_maps(machine, kernel))
|
|
pr_debug("Problems creating extra kernel maps, continuing anyway...\n");
|
|
|
|
/* 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, addr, 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 map *kernel_map = machine__kernel_map(machine);
|
|
struct dso *kernel = kernel_map ? kernel_map->dso : NULL;
|
|
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_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;
|
|
|
|
if (machine__is_host(machine))
|
|
kernel_type = DSO_TYPE_KERNEL;
|
|
else
|
|
kernel_type = DSO_TYPE_GUEST_KERNEL;
|
|
|
|
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__findnew_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 = kernel_type;
|
|
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;
|
|
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,
|
|
event->mmap2.maj,
|
|
event->mmap2.min, event->mmap2.ino,
|
|
event->mmap2.ino_generation,
|
|
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,
|
|
0, 0, 0, 0, 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);
|
|
|
|
BUG_ON(refcount_read(&th->refcnt) == 0);
|
|
if (lock)
|
|
down_write(&threads->lock);
|
|
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);
|
|
if (lock)
|
|
up_write(&threads->lock);
|
|
thread__put(th);
|
|
}
|
|
|
|
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_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_event(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->sym = al.sym;
|
|
ams->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->sym = al.sym;
|
|
ams->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 *map, struct symbol *sym, u64 ip)
|
|
{
|
|
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),
|
|
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 addr_location al;
|
|
int nr_loop_iter = 0;
|
|
u64 iter_cycles = 0;
|
|
const char *srcline = NULL;
|
|
|
|
al.filtered = 0;
|
|
al.sym = 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;
|
|
}
|
|
|
|
srcline = callchain_srcline(al.map, al.sym, al.addr);
|
|
return callchain_cursor_append(cursor, ip, al.map, al.sym,
|
|
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_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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
{
|
|
struct ip_callchain *chain = sample->callchain;
|
|
int chain_nr = min(max_stack, (int)chain->nr), i;
|
|
u8 cpumode = PERF_RECORD_MISC_USER;
|
|
u64 ip, branch_from = 0;
|
|
|
|
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, j, k;
|
|
bool branch;
|
|
struct branch_flags *flags;
|
|
/*
|
|
* 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;
|
|
|
|
for (j = 0; j < mix_chain_nr; j++) {
|
|
int err;
|
|
branch = false;
|
|
flags = NULL;
|
|
|
|
if (callchain_param.order == ORDER_CALLEE) {
|
|
if (j < i + 1)
|
|
ip = chain->ips[j];
|
|
else if (j > i + 1) {
|
|
k = j - i - 2;
|
|
ip = lbr_stack->entries[k].from;
|
|
branch = true;
|
|
flags = &lbr_stack->entries[k].flags;
|
|
} else {
|
|
ip = lbr_stack->entries[0].to;
|
|
branch = true;
|
|
flags = &lbr_stack->entries[0].flags;
|
|
branch_from =
|
|
lbr_stack->entries[0].from;
|
|
}
|
|
} else {
|
|
if (j < lbr_nr) {
|
|
k = lbr_nr - j - 1;
|
|
ip = lbr_stack->entries[k].from;
|
|
branch = true;
|
|
flags = &lbr_stack->entries[k].flags;
|
|
}
|
|
else if (j > lbr_nr)
|
|
ip = chain->ips[i + 1 - (j - lbr_nr)];
|
|
else {
|
|
ip = lbr_stack->entries[0].to;
|
|
branch = true;
|
|
flags = &lbr_stack->entries[0].flags;
|
|
branch_from =
|
|
lbr_stack->entries[0].from;
|
|
}
|
|
}
|
|
|
|
err = add_callchain_ip(thread, cursor, parent,
|
|
root_al, &cpumode, ip,
|
|
branch, flags, NULL,
|
|
branch_from);
|
|
if (err)
|
|
return (err < 0) ? err : 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
return 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 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 = 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 (perf_evsel__has_branch_callstack(evsel)) {
|
|
err = resolve_lbr_callchain_sample(thread, cursor, 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.
|
|
*/
|
|
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] = branch->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] = branch->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 (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 *map, struct symbol *sym, u64 ip)
|
|
{
|
|
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) {
|
|
ret = callchain_cursor_append(cursor, ip, map,
|
|
ilist->symbol, 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->sym == NULL)
|
|
return 0;
|
|
|
|
if (append_inlines(cursor, entry->map, entry->sym, entry->ip) == 0)
|
|
return 0;
|
|
|
|
/*
|
|
* Convert entry->ip from a virtual address to an offset in
|
|
* its corresponding binary.
|
|
*/
|
|
if (entry->map)
|
|
addr = map__map_ip(entry->map, entry->ip);
|
|
|
|
srcline = callchain_srcline(entry->map, entry->sym, addr);
|
|
return callchain_cursor_append(cursor, entry->ip,
|
|
entry->map, entry->sym,
|
|
false, NULL, 0, 0, 0, srcline);
|
|
}
|
|
|
|
static int thread__resolve_callchain_unwind(struct thread *thread,
|
|
struct callchain_cursor *cursor,
|
|
struct perf_evsel *evsel,
|
|
struct perf_sample *sample,
|
|
int max_stack)
|
|
{
|
|
/* 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, cursor,
|
|
thread, sample, max_stack);
|
|
}
|
|
|
|
int thread__resolve_callchain(struct thread *thread,
|
|
struct callchain_cursor *cursor,
|
|
struct perf_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;
|
|
}
|
|
|
|
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,
|
|
unsigned int nr_threads_synthesize)
|
|
{
|
|
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,
|
|
nr_threads_synthesize);
|
|
/* 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;
|
|
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(struct machine *machine, const char *filename)
|
|
{
|
|
return dsos__findnew(&machine->dsos, filename);
|
|
}
|
|
|
|
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;
|
|
}
|