481 lines
12 KiB
C
481 lines
12 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
#include <errno.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <bpf/bpf.h>
|
||
|
|
#include <bpf/btf.h>
|
||
|
|
#include <bpf/libbpf.h>
|
||
|
|
#include <linux/btf.h>
|
||
|
|
#include <linux/err.h>
|
||
|
|
#include "bpf-event.h"
|
||
|
|
#include "debug.h"
|
||
|
|
#include "dso.h"
|
||
|
|
#include "symbol.h"
|
||
|
|
#include "machine.h"
|
||
|
|
#include "env.h"
|
||
|
|
#include "session.h"
|
||
|
|
#include "map.h"
|
||
|
|
#include "evlist.h"
|
||
|
|
#include "record.h"
|
||
|
|
#include "util/synthetic-events.h"
|
||
|
|
|
||
|
|
#define ptr_to_u64(ptr) ((__u64)(unsigned long)(ptr))
|
||
|
|
|
||
|
|
static int snprintf_hex(char *buf, size_t size, unsigned char *data, size_t len)
|
||
|
|
{
|
||
|
|
int ret = 0;
|
||
|
|
size_t i;
|
||
|
|
|
||
|
|
for (i = 0; i < len; i++)
|
||
|
|
ret += snprintf(buf + ret, size - ret, "%02x", data[i]);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int machine__process_bpf_event_load(struct machine *machine,
|
||
|
|
union perf_event *event,
|
||
|
|
struct perf_sample *sample __maybe_unused)
|
||
|
|
{
|
||
|
|
struct bpf_prog_info_linear *info_linear;
|
||
|
|
struct bpf_prog_info_node *info_node;
|
||
|
|
struct perf_env *env = machine->env;
|
||
|
|
int id = event->bpf.id;
|
||
|
|
unsigned int i;
|
||
|
|
|
||
|
|
/* perf-record, no need to handle bpf-event */
|
||
|
|
if (env == NULL)
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
info_node = perf_env__find_bpf_prog_info(env, id);
|
||
|
|
if (!info_node)
|
||
|
|
return 0;
|
||
|
|
info_linear = info_node->info_linear;
|
||
|
|
|
||
|
|
for (i = 0; i < info_linear->info.nr_jited_ksyms; i++) {
|
||
|
|
u64 *addrs = (u64 *)(uintptr_t)(info_linear->info.jited_ksyms);
|
||
|
|
u64 addr = addrs[i];
|
||
|
|
struct map *map;
|
||
|
|
|
||
|
|
map = map_groups__find(&machine->kmaps, addr);
|
||
|
|
|
||
|
|
if (map) {
|
||
|
|
map->dso->binary_type = DSO_BINARY_TYPE__BPF_PROG_INFO;
|
||
|
|
map->dso->bpf_prog.id = id;
|
||
|
|
map->dso->bpf_prog.sub_id = i;
|
||
|
|
map->dso->bpf_prog.env = env;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int machine__process_bpf(struct machine *machine, union perf_event *event,
|
||
|
|
struct perf_sample *sample)
|
||
|
|
{
|
||
|
|
if (dump_trace)
|
||
|
|
perf_event__fprintf_bpf(event, stdout);
|
||
|
|
|
||
|
|
switch (event->bpf.type) {
|
||
|
|
case PERF_BPF_EVENT_PROG_LOAD:
|
||
|
|
return machine__process_bpf_event_load(machine, event, sample);
|
||
|
|
|
||
|
|
case PERF_BPF_EVENT_PROG_UNLOAD:
|
||
|
|
/*
|
||
|
|
* Do not free bpf_prog_info and btf of the program here,
|
||
|
|
* as annotation still need them. They will be freed at
|
||
|
|
* the end of the session.
|
||
|
|
*/
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
pr_debug("unexpected bpf event type of %d\n", event->bpf.type);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int perf_env__fetch_btf(struct perf_env *env,
|
||
|
|
u32 btf_id,
|
||
|
|
struct btf *btf)
|
||
|
|
{
|
||
|
|
struct btf_node *node;
|
||
|
|
u32 data_size;
|
||
|
|
const void *data;
|
||
|
|
|
||
|
|
data = btf__get_raw_data(btf, &data_size);
|
||
|
|
|
||
|
|
node = malloc(data_size + sizeof(struct btf_node));
|
||
|
|
if (!node)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
node->id = btf_id;
|
||
|
|
node->data_size = data_size;
|
||
|
|
memcpy(node->data, data, data_size);
|
||
|
|
|
||
|
|
perf_env__insert_btf(env, node);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int synthesize_bpf_prog_name(char *buf, int size,
|
||
|
|
struct bpf_prog_info *info,
|
||
|
|
struct btf *btf,
|
||
|
|
u32 sub_id)
|
||
|
|
{
|
||
|
|
u8 (*prog_tags)[BPF_TAG_SIZE] = (void *)(uintptr_t)(info->prog_tags);
|
||
|
|
void *func_infos = (void *)(uintptr_t)(info->func_info);
|
||
|
|
u32 sub_prog_cnt = info->nr_jited_ksyms;
|
||
|
|
const struct bpf_func_info *finfo;
|
||
|
|
const char *short_name = NULL;
|
||
|
|
const struct btf_type *t;
|
||
|
|
int name_len;
|
||
|
|
|
||
|
|
name_len = snprintf(buf, size, "bpf_prog_");
|
||
|
|
name_len += snprintf_hex(buf + name_len, size - name_len,
|
||
|
|
prog_tags[sub_id], BPF_TAG_SIZE);
|
||
|
|
if (btf) {
|
||
|
|
finfo = func_infos + sub_id * info->func_info_rec_size;
|
||
|
|
t = btf__type_by_id(btf, finfo->type_id);
|
||
|
|
short_name = btf__name_by_offset(btf, t->name_off);
|
||
|
|
} else if (sub_id == 0 && sub_prog_cnt == 1) {
|
||
|
|
/* no subprog */
|
||
|
|
if (info->name[0])
|
||
|
|
short_name = info->name;
|
||
|
|
} else
|
||
|
|
short_name = "F";
|
||
|
|
if (short_name)
|
||
|
|
name_len += snprintf(buf + name_len, size - name_len,
|
||
|
|
"_%s", short_name);
|
||
|
|
return name_len;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Synthesize PERF_RECORD_KSYMBOL and PERF_RECORD_BPF_EVENT for one bpf
|
||
|
|
* program. One PERF_RECORD_BPF_EVENT is generated for the program. And
|
||
|
|
* one PERF_RECORD_KSYMBOL is generated for each sub program.
|
||
|
|
*
|
||
|
|
* Returns:
|
||
|
|
* 0 for success;
|
||
|
|
* -1 for failures;
|
||
|
|
* -2 for lack of kernel support.
|
||
|
|
*/
|
||
|
|
static int perf_event__synthesize_one_bpf_prog(struct perf_session *session,
|
||
|
|
perf_event__handler_t process,
|
||
|
|
struct machine *machine,
|
||
|
|
int fd,
|
||
|
|
union perf_event *event,
|
||
|
|
struct record_opts *opts)
|
||
|
|
{
|
||
|
|
struct perf_record_ksymbol *ksymbol_event = &event->ksymbol;
|
||
|
|
struct perf_record_bpf_event *bpf_event = &event->bpf;
|
||
|
|
struct bpf_prog_info_linear *info_linear;
|
||
|
|
struct perf_tool *tool = session->tool;
|
||
|
|
struct bpf_prog_info_node *info_node;
|
||
|
|
struct bpf_prog_info *info;
|
||
|
|
struct btf *btf = NULL;
|
||
|
|
struct perf_env *env;
|
||
|
|
u32 sub_prog_cnt, i;
|
||
|
|
int err = 0;
|
||
|
|
u64 arrays;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* for perf-record and perf-report use header.env;
|
||
|
|
* otherwise, use global perf_env.
|
||
|
|
*/
|
||
|
|
env = session->data ? &session->header.env : &perf_env;
|
||
|
|
|
||
|
|
arrays = 1UL << BPF_PROG_INFO_JITED_KSYMS;
|
||
|
|
arrays |= 1UL << BPF_PROG_INFO_JITED_FUNC_LENS;
|
||
|
|
arrays |= 1UL << BPF_PROG_INFO_FUNC_INFO;
|
||
|
|
arrays |= 1UL << BPF_PROG_INFO_PROG_TAGS;
|
||
|
|
arrays |= 1UL << BPF_PROG_INFO_JITED_INSNS;
|
||
|
|
arrays |= 1UL << BPF_PROG_INFO_LINE_INFO;
|
||
|
|
arrays |= 1UL << BPF_PROG_INFO_JITED_LINE_INFO;
|
||
|
|
|
||
|
|
info_linear = bpf_program__get_prog_info_linear(fd, arrays);
|
||
|
|
if (IS_ERR_OR_NULL(info_linear)) {
|
||
|
|
info_linear = NULL;
|
||
|
|
pr_debug("%s: failed to get BPF program info. aborting\n", __func__);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (info_linear->info_len < offsetof(struct bpf_prog_info, prog_tags)) {
|
||
|
|
pr_debug("%s: the kernel is too old, aborting\n", __func__);
|
||
|
|
return -2;
|
||
|
|
}
|
||
|
|
|
||
|
|
info = &info_linear->info;
|
||
|
|
|
||
|
|
/* number of ksyms, func_lengths, and tags should match */
|
||
|
|
sub_prog_cnt = info->nr_jited_ksyms;
|
||
|
|
if (sub_prog_cnt != info->nr_prog_tags ||
|
||
|
|
sub_prog_cnt != info->nr_jited_func_lens)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
/* check BTF func info support */
|
||
|
|
if (info->btf_id && info->nr_func_info && info->func_info_rec_size) {
|
||
|
|
/* btf func info number should be same as sub_prog_cnt */
|
||
|
|
if (sub_prog_cnt != info->nr_func_info) {
|
||
|
|
pr_debug("%s: mismatch in BPF sub program count and BTF function info count, aborting\n", __func__);
|
||
|
|
err = -1;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
if (btf__get_from_id(info->btf_id, &btf)) {
|
||
|
|
pr_debug("%s: failed to get BTF of id %u, aborting\n", __func__, info->btf_id);
|
||
|
|
err = -1;
|
||
|
|
btf = NULL;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
perf_env__fetch_btf(env, info->btf_id, btf);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Synthesize PERF_RECORD_KSYMBOL */
|
||
|
|
for (i = 0; i < sub_prog_cnt; i++) {
|
||
|
|
__u32 *prog_lens = (__u32 *)(uintptr_t)(info->jited_func_lens);
|
||
|
|
__u64 *prog_addrs = (__u64 *)(uintptr_t)(info->jited_ksyms);
|
||
|
|
int name_len;
|
||
|
|
|
||
|
|
*ksymbol_event = (struct perf_record_ksymbol) {
|
||
|
|
.header = {
|
||
|
|
.type = PERF_RECORD_KSYMBOL,
|
||
|
|
.size = offsetof(struct perf_record_ksymbol, name),
|
||
|
|
},
|
||
|
|
.addr = prog_addrs[i],
|
||
|
|
.len = prog_lens[i],
|
||
|
|
.ksym_type = PERF_RECORD_KSYMBOL_TYPE_BPF,
|
||
|
|
.flags = 0,
|
||
|
|
};
|
||
|
|
|
||
|
|
name_len = synthesize_bpf_prog_name(ksymbol_event->name,
|
||
|
|
KSYM_NAME_LEN, info, btf, i);
|
||
|
|
ksymbol_event->header.size += PERF_ALIGN(name_len + 1,
|
||
|
|
sizeof(u64));
|
||
|
|
|
||
|
|
memset((void *)event + event->header.size, 0, machine->id_hdr_size);
|
||
|
|
event->header.size += machine->id_hdr_size;
|
||
|
|
err = perf_tool__process_synth_event(tool, event,
|
||
|
|
machine, process);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!opts->no_bpf_event) {
|
||
|
|
/* Synthesize PERF_RECORD_BPF_EVENT */
|
||
|
|
*bpf_event = (struct perf_record_bpf_event) {
|
||
|
|
.header = {
|
||
|
|
.type = PERF_RECORD_BPF_EVENT,
|
||
|
|
.size = sizeof(struct perf_record_bpf_event),
|
||
|
|
},
|
||
|
|
.type = PERF_BPF_EVENT_PROG_LOAD,
|
||
|
|
.flags = 0,
|
||
|
|
.id = info->id,
|
||
|
|
};
|
||
|
|
memcpy(bpf_event->tag, info->tag, BPF_TAG_SIZE);
|
||
|
|
memset((void *)event + event->header.size, 0, machine->id_hdr_size);
|
||
|
|
event->header.size += machine->id_hdr_size;
|
||
|
|
|
||
|
|
/* save bpf_prog_info to env */
|
||
|
|
info_node = malloc(sizeof(struct bpf_prog_info_node));
|
||
|
|
if (!info_node) {
|
||
|
|
err = -1;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
info_node->info_linear = info_linear;
|
||
|
|
perf_env__insert_bpf_prog_info(env, info_node);
|
||
|
|
info_linear = NULL;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* process after saving bpf_prog_info to env, so that
|
||
|
|
* required information is ready for look up
|
||
|
|
*/
|
||
|
|
err = perf_tool__process_synth_event(tool, event,
|
||
|
|
machine, process);
|
||
|
|
}
|
||
|
|
|
||
|
|
out:
|
||
|
|
free(info_linear);
|
||
|
|
free(btf);
|
||
|
|
return err ? -1 : 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int perf_event__synthesize_bpf_events(struct perf_session *session,
|
||
|
|
perf_event__handler_t process,
|
||
|
|
struct machine *machine,
|
||
|
|
struct record_opts *opts)
|
||
|
|
{
|
||
|
|
union perf_event *event;
|
||
|
|
__u32 id = 0;
|
||
|
|
int err;
|
||
|
|
int fd;
|
||
|
|
|
||
|
|
event = malloc(sizeof(event->bpf) + KSYM_NAME_LEN + machine->id_hdr_size);
|
||
|
|
if (!event)
|
||
|
|
return -1;
|
||
|
|
while (true) {
|
||
|
|
err = bpf_prog_get_next_id(id, &id);
|
||
|
|
if (err) {
|
||
|
|
if (errno == ENOENT) {
|
||
|
|
err = 0;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
pr_debug("%s: can't get next program: %s%s\n",
|
||
|
|
__func__, strerror(errno),
|
||
|
|
errno == EINVAL ? " -- kernel too old?" : "");
|
||
|
|
/* don't report error on old kernel or EPERM */
|
||
|
|
err = (errno == EINVAL || errno == EPERM) ? 0 : -1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
fd = bpf_prog_get_fd_by_id(id);
|
||
|
|
if (fd < 0) {
|
||
|
|
pr_debug("%s: failed to get fd for prog_id %u\n",
|
||
|
|
__func__, id);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
err = perf_event__synthesize_one_bpf_prog(session, process,
|
||
|
|
machine, fd,
|
||
|
|
event, opts);
|
||
|
|
close(fd);
|
||
|
|
if (err) {
|
||
|
|
/* do not return error for old kernel */
|
||
|
|
if (err == -2)
|
||
|
|
err = 0;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
free(event);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void perf_env__add_bpf_info(struct perf_env *env, u32 id)
|
||
|
|
{
|
||
|
|
struct bpf_prog_info_linear *info_linear;
|
||
|
|
struct bpf_prog_info_node *info_node;
|
||
|
|
struct btf *btf = NULL;
|
||
|
|
u64 arrays;
|
||
|
|
u32 btf_id;
|
||
|
|
int fd;
|
||
|
|
|
||
|
|
fd = bpf_prog_get_fd_by_id(id);
|
||
|
|
if (fd < 0)
|
||
|
|
return;
|
||
|
|
|
||
|
|
arrays = 1UL << BPF_PROG_INFO_JITED_KSYMS;
|
||
|
|
arrays |= 1UL << BPF_PROG_INFO_JITED_FUNC_LENS;
|
||
|
|
arrays |= 1UL << BPF_PROG_INFO_FUNC_INFO;
|
||
|
|
arrays |= 1UL << BPF_PROG_INFO_PROG_TAGS;
|
||
|
|
arrays |= 1UL << BPF_PROG_INFO_JITED_INSNS;
|
||
|
|
arrays |= 1UL << BPF_PROG_INFO_LINE_INFO;
|
||
|
|
arrays |= 1UL << BPF_PROG_INFO_JITED_LINE_INFO;
|
||
|
|
|
||
|
|
info_linear = bpf_program__get_prog_info_linear(fd, arrays);
|
||
|
|
if (IS_ERR_OR_NULL(info_linear)) {
|
||
|
|
pr_debug("%s: failed to get BPF program info. aborting\n", __func__);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
btf_id = info_linear->info.btf_id;
|
||
|
|
|
||
|
|
info_node = malloc(sizeof(struct bpf_prog_info_node));
|
||
|
|
if (info_node) {
|
||
|
|
info_node->info_linear = info_linear;
|
||
|
|
perf_env__insert_bpf_prog_info(env, info_node);
|
||
|
|
} else
|
||
|
|
free(info_linear);
|
||
|
|
|
||
|
|
if (btf_id == 0)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
if (btf__get_from_id(btf_id, &btf)) {
|
||
|
|
pr_debug("%s: failed to get BTF of id %u, aborting\n",
|
||
|
|
__func__, btf_id);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
perf_env__fetch_btf(env, btf_id, btf);
|
||
|
|
|
||
|
|
out:
|
||
|
|
free(btf);
|
||
|
|
close(fd);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int bpf_event__sb_cb(union perf_event *event, void *data)
|
||
|
|
{
|
||
|
|
struct perf_env *env = data;
|
||
|
|
|
||
|
|
if (event->header.type != PERF_RECORD_BPF_EVENT)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
switch (event->bpf.type) {
|
||
|
|
case PERF_BPF_EVENT_PROG_LOAD:
|
||
|
|
perf_env__add_bpf_info(env, event->bpf.id);
|
||
|
|
|
||
|
|
case PERF_BPF_EVENT_PROG_UNLOAD:
|
||
|
|
/*
|
||
|
|
* Do not free bpf_prog_info and btf of the program here,
|
||
|
|
* as annotation still need them. They will be freed at
|
||
|
|
* the end of the session.
|
||
|
|
*/
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
pr_debug("unexpected bpf event type of %d\n", event->bpf.type);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int bpf_event__add_sb_event(struct evlist **evlist,
|
||
|
|
struct perf_env *env)
|
||
|
|
{
|
||
|
|
struct perf_event_attr attr = {
|
||
|
|
.type = PERF_TYPE_SOFTWARE,
|
||
|
|
.config = PERF_COUNT_SW_DUMMY,
|
||
|
|
.sample_id_all = 1,
|
||
|
|
.watermark = 1,
|
||
|
|
.bpf_event = 1,
|
||
|
|
.size = sizeof(attr), /* to capture ABI version */
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Older gcc versions don't support designated initializers, like above,
|
||
|
|
* for unnamed union members, such as the following:
|
||
|
|
*/
|
||
|
|
attr.wakeup_watermark = 1;
|
||
|
|
|
||
|
|
return perf_evlist__add_sb_event(evlist, &attr, bpf_event__sb_cb, env);
|
||
|
|
}
|
||
|
|
|
||
|
|
void bpf_event__print_bpf_prog_info(struct bpf_prog_info *info,
|
||
|
|
struct perf_env *env,
|
||
|
|
FILE *fp)
|
||
|
|
{
|
||
|
|
__u32 *prog_lens = (__u32 *)(uintptr_t)(info->jited_func_lens);
|
||
|
|
__u64 *prog_addrs = (__u64 *)(uintptr_t)(info->jited_ksyms);
|
||
|
|
char name[KSYM_NAME_LEN];
|
||
|
|
struct btf *btf = NULL;
|
||
|
|
u32 sub_prog_cnt, i;
|
||
|
|
|
||
|
|
sub_prog_cnt = info->nr_jited_ksyms;
|
||
|
|
if (sub_prog_cnt != info->nr_prog_tags ||
|
||
|
|
sub_prog_cnt != info->nr_jited_func_lens)
|
||
|
|
return;
|
||
|
|
|
||
|
|
if (info->btf_id) {
|
||
|
|
struct btf_node *node;
|
||
|
|
|
||
|
|
node = perf_env__find_btf(env, info->btf_id);
|
||
|
|
if (node)
|
||
|
|
btf = btf__new((__u8 *)(node->data),
|
||
|
|
node->data_size);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (sub_prog_cnt == 1) {
|
||
|
|
synthesize_bpf_prog_name(name, KSYM_NAME_LEN, info, btf, 0);
|
||
|
|
fprintf(fp, "# bpf_prog_info %u: %s addr 0x%llx size %u\n",
|
||
|
|
info->id, name, prog_addrs[0], prog_lens[0]);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
fprintf(fp, "# bpf_prog_info %u:\n", info->id);
|
||
|
|
for (i = 0; i < sub_prog_cnt; i++) {
|
||
|
|
synthesize_bpf_prog_name(name, KSYM_NAME_LEN, info, btf, i);
|
||
|
|
|
||
|
|
fprintf(fp, "# \tsub_prog %u: %s addr 0x%llx size %u\n",
|
||
|
|
i, name, prog_addrs[i], prog_lens[i]);
|
||
|
|
}
|
||
|
|
}
|