![Wang Nan](/assets/img/avatar_default.png)
To support 98b5c2c65c
("perf, bpf: allow bpf programs attach to
tracepoints"), this patch allows BPF scripts to select tracepoints in
their section name.
Example:
# cat test_tracepoint.c
/*********************************************/
#include <uapi/linux/bpf.h>
#define SEC(NAME) __attribute__((section(NAME), used))
SEC("raw_syscalls:sys_enter")
int func(void *ctx)
{
/*
* /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/format:
* ...
* field:long id; offset:8; size:8; signed:1;
* ...
* ctx + 8 select 'id'
*/
u64 id = *((u64 *)(ctx + 8));
if (id == 1)
return 1;
return 0;
}
SEC("_write=sys_write")
int _write(void *ctx)
{
return 1;
}
char _license[] SEC("license") = "GPL";
int _version SEC("version") = LINUX_VERSION_CODE;
/*********************************************/
# perf record -e ./test_tracepoint.c dd if=/dev/zero of=/dev/null count=5
5+0 records in
5+0 records out
2560 bytes (2.6 kB) copied, 6.2281e-05 s, 41.1 MB/s
[ perf record: Woken up 1 times to write data ]
# perf script
dd 13436 [005] 1596.490869: raw_syscalls:sys_enter: NR 1 (1, 178d000, 200, 7ffe82470d60, ffffffffffffe020, fffff
dd 13436 [005] 1596.490871: perf_bpf_probe:_write: (ffffffff812351e0)
dd 13436 [005] 1596.490873: raw_syscalls:sys_enter: NR 1 (1, 178d000, 200, ffffffffffffe000, ffffffffffffe020, f
dd 13436 [005] 1596.490874: perf_bpf_probe:_write: (ffffffff812351e0)
dd 13436 [005] 1596.490876: raw_syscalls:sys_enter: NR 1 (1, 178d000, 200, ffffffffffffe000, ffffffffffffe020, f
dd 13436 [005] 1596.490876: perf_bpf_probe:_write: (ffffffff812351e0)
dd 13436 [005] 1596.490878: raw_syscalls:sys_enter: NR 1 (1, 178d000, 200, ffffffffffffe000, ffffffffffffe020, f
dd 13436 [005] 1596.490879: perf_bpf_probe:_write: (ffffffff812351e0)
dd 13436 [005] 1596.490881: raw_syscalls:sys_enter: NR 1 (1, 178d000, 200, ffffffffffffe000, ffffffffffffe020, f
dd 13436 [005] 1596.490882: perf_bpf_probe:_write: (ffffffff812351e0)
dd 13436 [005] 1596.490900: raw_syscalls:sys_enter: NR 1 (2, 7ffe8246e640, 1f, 40acb8, 7f44bac74700, 7f44baa4fba
dd 13436 [005] 1596.490901: perf_bpf_probe:_write: (ffffffff812351e0)
dd 13436 [005] 1596.490917: raw_syscalls:sys_enter: NR 1 (2, 7ffe8246e640, 1a, fffffffa, 7f44bac74700, 7f44baa4f
dd 13436 [005] 1596.490918: perf_bpf_probe:_write: (ffffffff812351e0)
dd 13436 [005] 1596.490932: raw_syscalls:sys_enter: NR 1 (2, 7ffe8246e640, 1a, fffffff9, 7f44bac74700, 7f44baa4f
dd 13436 [005] 1596.490933: perf_bpf_probe:_write: (ffffffff812351e0)
Committer note:
Further testing:
# trace --no-sys --event /home/acme/bpf/tracepoint.c cat /etc/passwd > /dev/null
0.000 raw_syscalls:sys_enter:NR 1 (1, 7f0490504000, c48, 7f0490503010, ffffffffffffffff, 0))
0.006 perf_bpf_probe:_write:(ffffffff81241bc0))
#
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1468406646-21642-6-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1773 lines
40 KiB
C
1773 lines
40 KiB
C
/*
|
|
* bpf-loader.c
|
|
*
|
|
* Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
|
|
* Copyright (C) 2015 Huawei Inc.
|
|
*/
|
|
|
|
#include <linux/bpf.h>
|
|
#include <bpf/libbpf.h>
|
|
#include <bpf/bpf.h>
|
|
#include <linux/err.h>
|
|
#include <linux/string.h>
|
|
#include "perf.h"
|
|
#include "debug.h"
|
|
#include "bpf-loader.h"
|
|
#include "bpf-prologue.h"
|
|
#include "llvm-utils.h"
|
|
#include "probe-event.h"
|
|
#include "probe-finder.h" // for MAX_PROBES
|
|
#include "parse-events.h"
|
|
#include "llvm-utils.h"
|
|
|
|
#define DEFINE_PRINT_FN(name, level) \
|
|
static int libbpf_##name(const char *fmt, ...) \
|
|
{ \
|
|
va_list args; \
|
|
int ret; \
|
|
\
|
|
va_start(args, fmt); \
|
|
ret = veprintf(level, verbose, pr_fmt(fmt), args);\
|
|
va_end(args); \
|
|
return ret; \
|
|
}
|
|
|
|
DEFINE_PRINT_FN(warning, 1)
|
|
DEFINE_PRINT_FN(info, 1)
|
|
DEFINE_PRINT_FN(debug, 1)
|
|
|
|
struct bpf_prog_priv {
|
|
bool is_tp;
|
|
char *sys_name;
|
|
char *evt_name;
|
|
struct perf_probe_event pev;
|
|
bool need_prologue;
|
|
struct bpf_insn *insns_buf;
|
|
int nr_types;
|
|
int *type_mapping;
|
|
};
|
|
|
|
static bool libbpf_initialized;
|
|
|
|
struct bpf_object *
|
|
bpf__prepare_load_buffer(void *obj_buf, size_t obj_buf_sz, const char *name)
|
|
{
|
|
struct bpf_object *obj;
|
|
|
|
if (!libbpf_initialized) {
|
|
libbpf_set_print(libbpf_warning,
|
|
libbpf_info,
|
|
libbpf_debug);
|
|
libbpf_initialized = true;
|
|
}
|
|
|
|
obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, name);
|
|
if (IS_ERR(obj)) {
|
|
pr_debug("bpf: failed to load buffer\n");
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
return obj;
|
|
}
|
|
|
|
struct bpf_object *bpf__prepare_load(const char *filename, bool source)
|
|
{
|
|
struct bpf_object *obj;
|
|
|
|
if (!libbpf_initialized) {
|
|
libbpf_set_print(libbpf_warning,
|
|
libbpf_info,
|
|
libbpf_debug);
|
|
libbpf_initialized = true;
|
|
}
|
|
|
|
if (source) {
|
|
int err;
|
|
void *obj_buf;
|
|
size_t obj_buf_sz;
|
|
|
|
err = llvm__compile_bpf(filename, &obj_buf, &obj_buf_sz);
|
|
if (err)
|
|
return ERR_PTR(-BPF_LOADER_ERRNO__COMPILE);
|
|
obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, filename);
|
|
free(obj_buf);
|
|
} else
|
|
obj = bpf_object__open(filename);
|
|
|
|
if (IS_ERR(obj)) {
|
|
pr_debug("bpf: failed to load %s\n", filename);
|
|
return obj;
|
|
}
|
|
|
|
return obj;
|
|
}
|
|
|
|
void bpf__clear(void)
|
|
{
|
|
struct bpf_object *obj, *tmp;
|
|
|
|
bpf_object__for_each_safe(obj, tmp) {
|
|
bpf__unprobe(obj);
|
|
bpf_object__close(obj);
|
|
}
|
|
}
|
|
|
|
static void
|
|
clear_prog_priv(struct bpf_program *prog __maybe_unused,
|
|
void *_priv)
|
|
{
|
|
struct bpf_prog_priv *priv = _priv;
|
|
|
|
cleanup_perf_probe_events(&priv->pev, 1);
|
|
zfree(&priv->insns_buf);
|
|
zfree(&priv->type_mapping);
|
|
zfree(&priv->sys_name);
|
|
zfree(&priv->evt_name);
|
|
free(priv);
|
|
}
|
|
|
|
static int
|
|
prog_config__exec(const char *value, struct perf_probe_event *pev)
|
|
{
|
|
pev->uprobes = true;
|
|
pev->target = strdup(value);
|
|
if (!pev->target)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
prog_config__module(const char *value, struct perf_probe_event *pev)
|
|
{
|
|
pev->uprobes = false;
|
|
pev->target = strdup(value);
|
|
if (!pev->target)
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
prog_config__bool(const char *value, bool *pbool, bool invert)
|
|
{
|
|
int err;
|
|
bool bool_value;
|
|
|
|
if (!pbool)
|
|
return -EINVAL;
|
|
|
|
err = strtobool(value, &bool_value);
|
|
if (err)
|
|
return err;
|
|
|
|
*pbool = invert ? !bool_value : bool_value;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
prog_config__inlines(const char *value,
|
|
struct perf_probe_event *pev __maybe_unused)
|
|
{
|
|
return prog_config__bool(value, &probe_conf.no_inlines, true);
|
|
}
|
|
|
|
static int
|
|
prog_config__force(const char *value,
|
|
struct perf_probe_event *pev __maybe_unused)
|
|
{
|
|
return prog_config__bool(value, &probe_conf.force_add, false);
|
|
}
|
|
|
|
static struct {
|
|
const char *key;
|
|
const char *usage;
|
|
const char *desc;
|
|
int (*func)(const char *, struct perf_probe_event *);
|
|
} bpf_prog_config_terms[] = {
|
|
{
|
|
.key = "exec",
|
|
.usage = "exec=<full path of file>",
|
|
.desc = "Set uprobe target",
|
|
.func = prog_config__exec,
|
|
},
|
|
{
|
|
.key = "module",
|
|
.usage = "module=<module name> ",
|
|
.desc = "Set kprobe module",
|
|
.func = prog_config__module,
|
|
},
|
|
{
|
|
.key = "inlines",
|
|
.usage = "inlines=[yes|no] ",
|
|
.desc = "Probe at inline symbol",
|
|
.func = prog_config__inlines,
|
|
},
|
|
{
|
|
.key = "force",
|
|
.usage = "force=[yes|no] ",
|
|
.desc = "Forcibly add events with existing name",
|
|
.func = prog_config__force,
|
|
},
|
|
};
|
|
|
|
static int
|
|
do_prog_config(const char *key, const char *value,
|
|
struct perf_probe_event *pev)
|
|
{
|
|
unsigned int i;
|
|
|
|
pr_debug("config bpf program: %s=%s\n", key, value);
|
|
for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
|
|
if (strcmp(key, bpf_prog_config_terms[i].key) == 0)
|
|
return bpf_prog_config_terms[i].func(value, pev);
|
|
|
|
pr_debug("BPF: ERROR: invalid program config option: %s=%s\n",
|
|
key, value);
|
|
|
|
pr_debug("\nHint: Valid options are:\n");
|
|
for (i = 0; i < ARRAY_SIZE(bpf_prog_config_terms); i++)
|
|
pr_debug("\t%s:\t%s\n", bpf_prog_config_terms[i].usage,
|
|
bpf_prog_config_terms[i].desc);
|
|
pr_debug("\n");
|
|
|
|
return -BPF_LOADER_ERRNO__PROGCONF_TERM;
|
|
}
|
|
|
|
static const char *
|
|
parse_prog_config_kvpair(const char *config_str, struct perf_probe_event *pev)
|
|
{
|
|
char *text = strdup(config_str);
|
|
char *sep, *line;
|
|
const char *main_str = NULL;
|
|
int err = 0;
|
|
|
|
if (!text) {
|
|
pr_debug("No enough memory: dup config_str failed\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
line = text;
|
|
while ((sep = strchr(line, ';'))) {
|
|
char *equ;
|
|
|
|
*sep = '\0';
|
|
equ = strchr(line, '=');
|
|
if (!equ) {
|
|
pr_warning("WARNING: invalid config in BPF object: %s\n",
|
|
line);
|
|
pr_warning("\tShould be 'key=value'.\n");
|
|
goto nextline;
|
|
}
|
|
*equ = '\0';
|
|
|
|
err = do_prog_config(line, equ + 1, pev);
|
|
if (err)
|
|
break;
|
|
nextline:
|
|
line = sep + 1;
|
|
}
|
|
|
|
if (!err)
|
|
main_str = config_str + (line - text);
|
|
free(text);
|
|
|
|
return err ? ERR_PTR(err) : main_str;
|
|
}
|
|
|
|
static int
|
|
parse_prog_config(const char *config_str, const char **p_main_str,
|
|
bool *is_tp, struct perf_probe_event *pev)
|
|
{
|
|
int err;
|
|
const char *main_str = parse_prog_config_kvpair(config_str, pev);
|
|
|
|
if (IS_ERR(main_str))
|
|
return PTR_ERR(main_str);
|
|
|
|
*p_main_str = main_str;
|
|
if (!strchr(main_str, '=')) {
|
|
/* Is a tracepoint event? */
|
|
const char *s = strchr(main_str, ':');
|
|
|
|
if (!s) {
|
|
pr_debug("bpf: '%s' is not a valid tracepoint\n",
|
|
config_str);
|
|
return -BPF_LOADER_ERRNO__CONFIG;
|
|
}
|
|
|
|
*is_tp = true;
|
|
return 0;
|
|
}
|
|
|
|
*is_tp = false;
|
|
err = parse_perf_probe_command(main_str, pev);
|
|
if (err < 0) {
|
|
pr_debug("bpf: '%s' is not a valid config string\n",
|
|
config_str);
|
|
/* parse failed, don't need clear pev. */
|
|
return -BPF_LOADER_ERRNO__CONFIG;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
config_bpf_program(struct bpf_program *prog)
|
|
{
|
|
struct perf_probe_event *pev = NULL;
|
|
struct bpf_prog_priv *priv = NULL;
|
|
const char *config_str, *main_str;
|
|
bool is_tp = false;
|
|
int err;
|
|
|
|
/* Initialize per-program probing setting */
|
|
probe_conf.no_inlines = false;
|
|
probe_conf.force_add = false;
|
|
|
|
config_str = bpf_program__title(prog, false);
|
|
if (IS_ERR(config_str)) {
|
|
pr_debug("bpf: unable to get title for program\n");
|
|
return PTR_ERR(config_str);
|
|
}
|
|
|
|
priv = calloc(sizeof(*priv), 1);
|
|
if (!priv) {
|
|
pr_debug("bpf: failed to alloc priv\n");
|
|
return -ENOMEM;
|
|
}
|
|
pev = &priv->pev;
|
|
|
|
pr_debug("bpf: config program '%s'\n", config_str);
|
|
err = parse_prog_config(config_str, &main_str, &is_tp, pev);
|
|
if (err)
|
|
goto errout;
|
|
|
|
if (is_tp) {
|
|
char *s = strchr(main_str, ':');
|
|
|
|
priv->is_tp = true;
|
|
priv->sys_name = strndup(main_str, s - main_str);
|
|
priv->evt_name = strdup(s + 1);
|
|
goto set_priv;
|
|
}
|
|
|
|
if (pev->group && strcmp(pev->group, PERF_BPF_PROBE_GROUP)) {
|
|
pr_debug("bpf: '%s': group for event is set and not '%s'.\n",
|
|
config_str, PERF_BPF_PROBE_GROUP);
|
|
err = -BPF_LOADER_ERRNO__GROUP;
|
|
goto errout;
|
|
} else if (!pev->group)
|
|
pev->group = strdup(PERF_BPF_PROBE_GROUP);
|
|
|
|
if (!pev->group) {
|
|
pr_debug("bpf: strdup failed\n");
|
|
err = -ENOMEM;
|
|
goto errout;
|
|
}
|
|
|
|
if (!pev->event) {
|
|
pr_debug("bpf: '%s': event name is missing. Section name should be 'key=value'\n",
|
|
config_str);
|
|
err = -BPF_LOADER_ERRNO__EVENTNAME;
|
|
goto errout;
|
|
}
|
|
pr_debug("bpf: config '%s' is ok\n", config_str);
|
|
|
|
set_priv:
|
|
err = bpf_program__set_priv(prog, priv, clear_prog_priv);
|
|
if (err) {
|
|
pr_debug("Failed to set priv for program '%s'\n", config_str);
|
|
goto errout;
|
|
}
|
|
|
|
return 0;
|
|
|
|
errout:
|
|
if (pev)
|
|
clear_perf_probe_event(pev);
|
|
free(priv);
|
|
return err;
|
|
}
|
|
|
|
static int bpf__prepare_probe(void)
|
|
{
|
|
static int err = 0;
|
|
static bool initialized = false;
|
|
|
|
/*
|
|
* Make err static, so if init failed the first, bpf__prepare_probe()
|
|
* fails each time without calling init_probe_symbol_maps multiple
|
|
* times.
|
|
*/
|
|
if (initialized)
|
|
return err;
|
|
|
|
initialized = true;
|
|
err = init_probe_symbol_maps(false);
|
|
if (err < 0)
|
|
pr_debug("Failed to init_probe_symbol_maps\n");
|
|
probe_conf.max_probes = MAX_PROBES;
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
preproc_gen_prologue(struct bpf_program *prog, int n,
|
|
struct bpf_insn *orig_insns, int orig_insns_cnt,
|
|
struct bpf_prog_prep_result *res)
|
|
{
|
|
struct bpf_prog_priv *priv = bpf_program__priv(prog);
|
|
struct probe_trace_event *tev;
|
|
struct perf_probe_event *pev;
|
|
struct bpf_insn *buf;
|
|
size_t prologue_cnt = 0;
|
|
int i, err;
|
|
|
|
if (IS_ERR(priv) || !priv || priv->is_tp)
|
|
goto errout;
|
|
|
|
pev = &priv->pev;
|
|
|
|
if (n < 0 || n >= priv->nr_types)
|
|
goto errout;
|
|
|
|
/* Find a tev belongs to that type */
|
|
for (i = 0; i < pev->ntevs; i++) {
|
|
if (priv->type_mapping[i] == n)
|
|
break;
|
|
}
|
|
|
|
if (i >= pev->ntevs) {
|
|
pr_debug("Internal error: prologue type %d not found\n", n);
|
|
return -BPF_LOADER_ERRNO__PROLOGUE;
|
|
}
|
|
|
|
tev = &pev->tevs[i];
|
|
|
|
buf = priv->insns_buf;
|
|
err = bpf__gen_prologue(tev->args, tev->nargs,
|
|
buf, &prologue_cnt,
|
|
BPF_MAXINSNS - orig_insns_cnt);
|
|
if (err) {
|
|
const char *title;
|
|
|
|
title = bpf_program__title(prog, false);
|
|
if (!title)
|
|
title = "[unknown]";
|
|
|
|
pr_debug("Failed to generate prologue for program %s\n",
|
|
title);
|
|
return err;
|
|
}
|
|
|
|
memcpy(&buf[prologue_cnt], orig_insns,
|
|
sizeof(struct bpf_insn) * orig_insns_cnt);
|
|
|
|
res->new_insn_ptr = buf;
|
|
res->new_insn_cnt = prologue_cnt + orig_insns_cnt;
|
|
res->pfd = NULL;
|
|
return 0;
|
|
|
|
errout:
|
|
pr_debug("Internal error in preproc_gen_prologue\n");
|
|
return -BPF_LOADER_ERRNO__PROLOGUE;
|
|
}
|
|
|
|
/*
|
|
* compare_tev_args is reflexive, transitive and antisymmetric.
|
|
* I can proof it but this margin is too narrow to contain.
|
|
*/
|
|
static int compare_tev_args(const void *ptev1, const void *ptev2)
|
|
{
|
|
int i, ret;
|
|
const struct probe_trace_event *tev1 =
|
|
*(const struct probe_trace_event **)ptev1;
|
|
const struct probe_trace_event *tev2 =
|
|
*(const struct probe_trace_event **)ptev2;
|
|
|
|
ret = tev2->nargs - tev1->nargs;
|
|
if (ret)
|
|
return ret;
|
|
|
|
for (i = 0; i < tev1->nargs; i++) {
|
|
struct probe_trace_arg *arg1, *arg2;
|
|
struct probe_trace_arg_ref *ref1, *ref2;
|
|
|
|
arg1 = &tev1->args[i];
|
|
arg2 = &tev2->args[i];
|
|
|
|
ret = strcmp(arg1->value, arg2->value);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ref1 = arg1->ref;
|
|
ref2 = arg2->ref;
|
|
|
|
while (ref1 && ref2) {
|
|
ret = ref2->offset - ref1->offset;
|
|
if (ret)
|
|
return ret;
|
|
|
|
ref1 = ref1->next;
|
|
ref2 = ref2->next;
|
|
}
|
|
|
|
if (ref1 || ref2)
|
|
return ref2 ? 1 : -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Assign a type number to each tevs in a pev.
|
|
* mapping is an array with same slots as tevs in that pev.
|
|
* nr_types will be set to number of types.
|
|
*/
|
|
static int map_prologue(struct perf_probe_event *pev, int *mapping,
|
|
int *nr_types)
|
|
{
|
|
int i, type = 0;
|
|
struct probe_trace_event **ptevs;
|
|
|
|
size_t array_sz = sizeof(*ptevs) * pev->ntevs;
|
|
|
|
ptevs = malloc(array_sz);
|
|
if (!ptevs) {
|
|
pr_debug("No ehough memory: alloc ptevs failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pr_debug("In map_prologue, ntevs=%d\n", pev->ntevs);
|
|
for (i = 0; i < pev->ntevs; i++)
|
|
ptevs[i] = &pev->tevs[i];
|
|
|
|
qsort(ptevs, pev->ntevs, sizeof(*ptevs),
|
|
compare_tev_args);
|
|
|
|
for (i = 0; i < pev->ntevs; i++) {
|
|
int n;
|
|
|
|
n = ptevs[i] - pev->tevs;
|
|
if (i == 0) {
|
|
mapping[n] = type;
|
|
pr_debug("mapping[%d]=%d\n", n, type);
|
|
continue;
|
|
}
|
|
|
|
if (compare_tev_args(ptevs + i, ptevs + i - 1) == 0)
|
|
mapping[n] = type;
|
|
else
|
|
mapping[n] = ++type;
|
|
|
|
pr_debug("mapping[%d]=%d\n", n, mapping[n]);
|
|
}
|
|
free(ptevs);
|
|
*nr_types = type + 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hook_load_preprocessor(struct bpf_program *prog)
|
|
{
|
|
struct bpf_prog_priv *priv = bpf_program__priv(prog);
|
|
struct perf_probe_event *pev;
|
|
bool need_prologue = false;
|
|
int err, i;
|
|
|
|
if (IS_ERR(priv) || !priv) {
|
|
pr_debug("Internal error when hook preprocessor\n");
|
|
return -BPF_LOADER_ERRNO__INTERNAL;
|
|
}
|
|
|
|
if (priv->is_tp) {
|
|
priv->need_prologue = false;
|
|
return 0;
|
|
}
|
|
|
|
pev = &priv->pev;
|
|
for (i = 0; i < pev->ntevs; i++) {
|
|
struct probe_trace_event *tev = &pev->tevs[i];
|
|
|
|
if (tev->nargs > 0) {
|
|
need_prologue = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Since all tevs don't have argument, we don't need generate
|
|
* prologue.
|
|
*/
|
|
if (!need_prologue) {
|
|
priv->need_prologue = false;
|
|
return 0;
|
|
}
|
|
|
|
priv->need_prologue = true;
|
|
priv->insns_buf = malloc(sizeof(struct bpf_insn) * BPF_MAXINSNS);
|
|
if (!priv->insns_buf) {
|
|
pr_debug("No enough memory: alloc insns_buf failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
priv->type_mapping = malloc(sizeof(int) * pev->ntevs);
|
|
if (!priv->type_mapping) {
|
|
pr_debug("No enough memory: alloc type_mapping failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
memset(priv->type_mapping, -1,
|
|
sizeof(int) * pev->ntevs);
|
|
|
|
err = map_prologue(pev, priv->type_mapping, &priv->nr_types);
|
|
if (err)
|
|
return err;
|
|
|
|
err = bpf_program__set_prep(prog, priv->nr_types,
|
|
preproc_gen_prologue);
|
|
return err;
|
|
}
|
|
|
|
int bpf__probe(struct bpf_object *obj)
|
|
{
|
|
int err = 0;
|
|
struct bpf_program *prog;
|
|
struct bpf_prog_priv *priv;
|
|
struct perf_probe_event *pev;
|
|
|
|
err = bpf__prepare_probe();
|
|
if (err) {
|
|
pr_debug("bpf__prepare_probe failed\n");
|
|
return err;
|
|
}
|
|
|
|
bpf_object__for_each_program(prog, obj) {
|
|
err = config_bpf_program(prog);
|
|
if (err)
|
|
goto out;
|
|
|
|
priv = bpf_program__priv(prog);
|
|
if (IS_ERR(priv) || !priv) {
|
|
err = PTR_ERR(priv);
|
|
goto out;
|
|
}
|
|
|
|
if (priv->is_tp) {
|
|
bpf_program__set_tracepoint(prog);
|
|
continue;
|
|
}
|
|
|
|
bpf_program__set_kprobe(prog);
|
|
pev = &priv->pev;
|
|
|
|
err = convert_perf_probe_events(pev, 1);
|
|
if (err < 0) {
|
|
pr_debug("bpf_probe: failed to convert perf probe events");
|
|
goto out;
|
|
}
|
|
|
|
err = apply_perf_probe_events(pev, 1);
|
|
if (err < 0) {
|
|
pr_debug("bpf_probe: failed to apply perf probe events");
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* After probing, let's consider prologue, which
|
|
* adds program fetcher to BPF programs.
|
|
*
|
|
* hook_load_preprocessorr() hooks pre-processor
|
|
* to bpf_program, let it generate prologue
|
|
* dynamically during loading.
|
|
*/
|
|
err = hook_load_preprocessor(prog);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
out:
|
|
return err < 0 ? err : 0;
|
|
}
|
|
|
|
#define EVENTS_WRITE_BUFSIZE 4096
|
|
int bpf__unprobe(struct bpf_object *obj)
|
|
{
|
|
int err, ret = 0;
|
|
struct bpf_program *prog;
|
|
|
|
bpf_object__for_each_program(prog, obj) {
|
|
struct bpf_prog_priv *priv = bpf_program__priv(prog);
|
|
int i;
|
|
|
|
if (IS_ERR(priv) || !priv || priv->is_tp)
|
|
continue;
|
|
|
|
for (i = 0; i < priv->pev.ntevs; i++) {
|
|
struct probe_trace_event *tev = &priv->pev.tevs[i];
|
|
char name_buf[EVENTS_WRITE_BUFSIZE];
|
|
struct strfilter *delfilter;
|
|
|
|
snprintf(name_buf, EVENTS_WRITE_BUFSIZE,
|
|
"%s:%s", tev->group, tev->event);
|
|
name_buf[EVENTS_WRITE_BUFSIZE - 1] = '\0';
|
|
|
|
delfilter = strfilter__new(name_buf, NULL);
|
|
if (!delfilter) {
|
|
pr_debug("Failed to create filter for unprobing\n");
|
|
ret = -ENOMEM;
|
|
continue;
|
|
}
|
|
|
|
err = del_perf_probe_events(delfilter);
|
|
strfilter__delete(delfilter);
|
|
if (err) {
|
|
pr_debug("Failed to delete %s\n", name_buf);
|
|
ret = err;
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int bpf__load(struct bpf_object *obj)
|
|
{
|
|
int err;
|
|
|
|
err = bpf_object__load(obj);
|
|
if (err) {
|
|
pr_debug("bpf: load objects failed\n");
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int bpf__foreach_event(struct bpf_object *obj,
|
|
bpf_prog_iter_callback_t func,
|
|
void *arg)
|
|
{
|
|
struct bpf_program *prog;
|
|
int err;
|
|
|
|
bpf_object__for_each_program(prog, obj) {
|
|
struct bpf_prog_priv *priv = bpf_program__priv(prog);
|
|
struct probe_trace_event *tev;
|
|
struct perf_probe_event *pev;
|
|
int i, fd;
|
|
|
|
if (IS_ERR(priv) || !priv) {
|
|
pr_debug("bpf: failed to get private field\n");
|
|
return -BPF_LOADER_ERRNO__INTERNAL;
|
|
}
|
|
|
|
if (priv->is_tp) {
|
|
fd = bpf_program__fd(prog);
|
|
err = (*func)(priv->sys_name, priv->evt_name, fd, arg);
|
|
if (err) {
|
|
pr_debug("bpf: tracepoint call back failed, stop iterate\n");
|
|
return err;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
pev = &priv->pev;
|
|
for (i = 0; i < pev->ntevs; i++) {
|
|
tev = &pev->tevs[i];
|
|
|
|
if (priv->need_prologue) {
|
|
int type = priv->type_mapping[i];
|
|
|
|
fd = bpf_program__nth_fd(prog, type);
|
|
} else {
|
|
fd = bpf_program__fd(prog);
|
|
}
|
|
|
|
if (fd < 0) {
|
|
pr_debug("bpf: failed to get file descriptor\n");
|
|
return fd;
|
|
}
|
|
|
|
err = (*func)(tev->group, tev->event, fd, arg);
|
|
if (err) {
|
|
pr_debug("bpf: call back failed, stop iterate\n");
|
|
return err;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
enum bpf_map_op_type {
|
|
BPF_MAP_OP_SET_VALUE,
|
|
BPF_MAP_OP_SET_EVSEL,
|
|
};
|
|
|
|
enum bpf_map_key_type {
|
|
BPF_MAP_KEY_ALL,
|
|
BPF_MAP_KEY_RANGES,
|
|
};
|
|
|
|
struct bpf_map_op {
|
|
struct list_head list;
|
|
enum bpf_map_op_type op_type;
|
|
enum bpf_map_key_type key_type;
|
|
union {
|
|
struct parse_events_array array;
|
|
} k;
|
|
union {
|
|
u64 value;
|
|
struct perf_evsel *evsel;
|
|
} v;
|
|
};
|
|
|
|
struct bpf_map_priv {
|
|
struct list_head ops_list;
|
|
};
|
|
|
|
static void
|
|
bpf_map_op__delete(struct bpf_map_op *op)
|
|
{
|
|
if (!list_empty(&op->list))
|
|
list_del(&op->list);
|
|
if (op->key_type == BPF_MAP_KEY_RANGES)
|
|
parse_events__clear_array(&op->k.array);
|
|
free(op);
|
|
}
|
|
|
|
static void
|
|
bpf_map_priv__purge(struct bpf_map_priv *priv)
|
|
{
|
|
struct bpf_map_op *pos, *n;
|
|
|
|
list_for_each_entry_safe(pos, n, &priv->ops_list, list) {
|
|
list_del_init(&pos->list);
|
|
bpf_map_op__delete(pos);
|
|
}
|
|
}
|
|
|
|
static void
|
|
bpf_map_priv__clear(struct bpf_map *map __maybe_unused,
|
|
void *_priv)
|
|
{
|
|
struct bpf_map_priv *priv = _priv;
|
|
|
|
bpf_map_priv__purge(priv);
|
|
free(priv);
|
|
}
|
|
|
|
static int
|
|
bpf_map_op_setkey(struct bpf_map_op *op, struct parse_events_term *term)
|
|
{
|
|
op->key_type = BPF_MAP_KEY_ALL;
|
|
if (!term)
|
|
return 0;
|
|
|
|
if (term->array.nr_ranges) {
|
|
size_t memsz = term->array.nr_ranges *
|
|
sizeof(op->k.array.ranges[0]);
|
|
|
|
op->k.array.ranges = memdup(term->array.ranges, memsz);
|
|
if (!op->k.array.ranges) {
|
|
pr_debug("No enough memory to alloc indices for map\n");
|
|
return -ENOMEM;
|
|
}
|
|
op->key_type = BPF_MAP_KEY_RANGES;
|
|
op->k.array.nr_ranges = term->array.nr_ranges;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct bpf_map_op *
|
|
bpf_map_op__new(struct parse_events_term *term)
|
|
{
|
|
struct bpf_map_op *op;
|
|
int err;
|
|
|
|
op = zalloc(sizeof(*op));
|
|
if (!op) {
|
|
pr_debug("Failed to alloc bpf_map_op\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
INIT_LIST_HEAD(&op->list);
|
|
|
|
err = bpf_map_op_setkey(op, term);
|
|
if (err) {
|
|
free(op);
|
|
return ERR_PTR(err);
|
|
}
|
|
return op;
|
|
}
|
|
|
|
static struct bpf_map_op *
|
|
bpf_map_op__clone(struct bpf_map_op *op)
|
|
{
|
|
struct bpf_map_op *newop;
|
|
|
|
newop = memdup(op, sizeof(*op));
|
|
if (!newop) {
|
|
pr_debug("Failed to alloc bpf_map_op\n");
|
|
return NULL;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&newop->list);
|
|
if (op->key_type == BPF_MAP_KEY_RANGES) {
|
|
size_t memsz = op->k.array.nr_ranges *
|
|
sizeof(op->k.array.ranges[0]);
|
|
|
|
newop->k.array.ranges = memdup(op->k.array.ranges, memsz);
|
|
if (!newop->k.array.ranges) {
|
|
pr_debug("Failed to alloc indices for map\n");
|
|
free(newop);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
return newop;
|
|
}
|
|
|
|
static struct bpf_map_priv *
|
|
bpf_map_priv__clone(struct bpf_map_priv *priv)
|
|
{
|
|
struct bpf_map_priv *newpriv;
|
|
struct bpf_map_op *pos, *newop;
|
|
|
|
newpriv = zalloc(sizeof(*newpriv));
|
|
if (!newpriv) {
|
|
pr_debug("No enough memory to alloc map private\n");
|
|
return NULL;
|
|
}
|
|
INIT_LIST_HEAD(&newpriv->ops_list);
|
|
|
|
list_for_each_entry(pos, &priv->ops_list, list) {
|
|
newop = bpf_map_op__clone(pos);
|
|
if (!newop) {
|
|
bpf_map_priv__purge(newpriv);
|
|
return NULL;
|
|
}
|
|
list_add_tail(&newop->list, &newpriv->ops_list);
|
|
}
|
|
|
|
return newpriv;
|
|
}
|
|
|
|
static int
|
|
bpf_map__add_op(struct bpf_map *map, struct bpf_map_op *op)
|
|
{
|
|
const char *map_name = bpf_map__name(map);
|
|
struct bpf_map_priv *priv = bpf_map__priv(map);
|
|
|
|
if (IS_ERR(priv)) {
|
|
pr_debug("Failed to get private from map %s\n", map_name);
|
|
return PTR_ERR(priv);
|
|
}
|
|
|
|
if (!priv) {
|
|
priv = zalloc(sizeof(*priv));
|
|
if (!priv) {
|
|
pr_debug("No enough memory to alloc map private\n");
|
|
return -ENOMEM;
|
|
}
|
|
INIT_LIST_HEAD(&priv->ops_list);
|
|
|
|
if (bpf_map__set_priv(map, priv, bpf_map_priv__clear)) {
|
|
free(priv);
|
|
return -BPF_LOADER_ERRNO__INTERNAL;
|
|
}
|
|
}
|
|
|
|
list_add_tail(&op->list, &priv->ops_list);
|
|
return 0;
|
|
}
|
|
|
|
static struct bpf_map_op *
|
|
bpf_map__add_newop(struct bpf_map *map, struct parse_events_term *term)
|
|
{
|
|
struct bpf_map_op *op;
|
|
int err;
|
|
|
|
op = bpf_map_op__new(term);
|
|
if (IS_ERR(op))
|
|
return op;
|
|
|
|
err = bpf_map__add_op(map, op);
|
|
if (err) {
|
|
bpf_map_op__delete(op);
|
|
return ERR_PTR(err);
|
|
}
|
|
return op;
|
|
}
|
|
|
|
static int
|
|
__bpf_map__config_value(struct bpf_map *map,
|
|
struct parse_events_term *term)
|
|
{
|
|
struct bpf_map_op *op;
|
|
const char *map_name = bpf_map__name(map);
|
|
const struct bpf_map_def *def = bpf_map__def(map);
|
|
|
|
if (IS_ERR(def)) {
|
|
pr_debug("Unable to get map definition from '%s'\n",
|
|
map_name);
|
|
return -BPF_LOADER_ERRNO__INTERNAL;
|
|
}
|
|
|
|
if (def->type != BPF_MAP_TYPE_ARRAY) {
|
|
pr_debug("Map %s type is not BPF_MAP_TYPE_ARRAY\n",
|
|
map_name);
|
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
|
|
}
|
|
if (def->key_size < sizeof(unsigned int)) {
|
|
pr_debug("Map %s has incorrect key size\n", map_name);
|
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_KEYSIZE;
|
|
}
|
|
switch (def->value_size) {
|
|
case 1:
|
|
case 2:
|
|
case 4:
|
|
case 8:
|
|
break;
|
|
default:
|
|
pr_debug("Map %s has incorrect value size\n", map_name);
|
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
|
|
}
|
|
|
|
op = bpf_map__add_newop(map, term);
|
|
if (IS_ERR(op))
|
|
return PTR_ERR(op);
|
|
op->op_type = BPF_MAP_OP_SET_VALUE;
|
|
op->v.value = term->val.num;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
bpf_map__config_value(struct bpf_map *map,
|
|
struct parse_events_term *term,
|
|
struct perf_evlist *evlist __maybe_unused)
|
|
{
|
|
if (!term->err_val) {
|
|
pr_debug("Config value not set\n");
|
|
return -BPF_LOADER_ERRNO__OBJCONF_CONF;
|
|
}
|
|
|
|
if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM) {
|
|
pr_debug("ERROR: wrong value type for 'value'\n");
|
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
|
|
}
|
|
|
|
return __bpf_map__config_value(map, term);
|
|
}
|
|
|
|
static int
|
|
__bpf_map__config_event(struct bpf_map *map,
|
|
struct parse_events_term *term,
|
|
struct perf_evlist *evlist)
|
|
{
|
|
struct perf_evsel *evsel;
|
|
const struct bpf_map_def *def;
|
|
struct bpf_map_op *op;
|
|
const char *map_name = bpf_map__name(map);
|
|
|
|
evsel = perf_evlist__find_evsel_by_str(evlist, term->val.str);
|
|
if (!evsel) {
|
|
pr_debug("Event (for '%s') '%s' doesn't exist\n",
|
|
map_name, term->val.str);
|
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_NOEVT;
|
|
}
|
|
|
|
def = bpf_map__def(map);
|
|
if (IS_ERR(def)) {
|
|
pr_debug("Unable to get map definition from '%s'\n",
|
|
map_name);
|
|
return PTR_ERR(def);
|
|
}
|
|
|
|
/*
|
|
* No need to check key_size and value_size:
|
|
* kernel has already checked them.
|
|
*/
|
|
if (def->type != BPF_MAP_TYPE_PERF_EVENT_ARRAY) {
|
|
pr_debug("Map %s type is not BPF_MAP_TYPE_PERF_EVENT_ARRAY\n",
|
|
map_name);
|
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
|
|
}
|
|
|
|
op = bpf_map__add_newop(map, term);
|
|
if (IS_ERR(op))
|
|
return PTR_ERR(op);
|
|
op->op_type = BPF_MAP_OP_SET_EVSEL;
|
|
op->v.evsel = evsel;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
bpf_map__config_event(struct bpf_map *map,
|
|
struct parse_events_term *term,
|
|
struct perf_evlist *evlist)
|
|
{
|
|
if (!term->err_val) {
|
|
pr_debug("Config value not set\n");
|
|
return -BPF_LOADER_ERRNO__OBJCONF_CONF;
|
|
}
|
|
|
|
if (term->type_val != PARSE_EVENTS__TERM_TYPE_STR) {
|
|
pr_debug("ERROR: wrong value type for 'event'\n");
|
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUE;
|
|
}
|
|
|
|
return __bpf_map__config_event(map, term, evlist);
|
|
}
|
|
|
|
struct bpf_obj_config__map_func {
|
|
const char *config_opt;
|
|
int (*config_func)(struct bpf_map *, struct parse_events_term *,
|
|
struct perf_evlist *);
|
|
};
|
|
|
|
struct bpf_obj_config__map_func bpf_obj_config__map_funcs[] = {
|
|
{"value", bpf_map__config_value},
|
|
{"event", bpf_map__config_event},
|
|
};
|
|
|
|
static int
|
|
config_map_indices_range_check(struct parse_events_term *term,
|
|
struct bpf_map *map,
|
|
const char *map_name)
|
|
{
|
|
struct parse_events_array *array = &term->array;
|
|
const struct bpf_map_def *def;
|
|
unsigned int i;
|
|
|
|
if (!array->nr_ranges)
|
|
return 0;
|
|
if (!array->ranges) {
|
|
pr_debug("ERROR: map %s: array->nr_ranges is %d but range array is NULL\n",
|
|
map_name, (int)array->nr_ranges);
|
|
return -BPF_LOADER_ERRNO__INTERNAL;
|
|
}
|
|
|
|
def = bpf_map__def(map);
|
|
if (IS_ERR(def)) {
|
|
pr_debug("ERROR: Unable to get map definition from '%s'\n",
|
|
map_name);
|
|
return -BPF_LOADER_ERRNO__INTERNAL;
|
|
}
|
|
|
|
for (i = 0; i < array->nr_ranges; i++) {
|
|
unsigned int start = array->ranges[i].start;
|
|
size_t length = array->ranges[i].length;
|
|
unsigned int idx = start + length - 1;
|
|
|
|
if (idx >= def->max_entries) {
|
|
pr_debug("ERROR: index %d too large\n", idx);
|
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_IDX2BIG;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
bpf__obj_config_map(struct bpf_object *obj,
|
|
struct parse_events_term *term,
|
|
struct perf_evlist *evlist,
|
|
int *key_scan_pos)
|
|
{
|
|
/* key is "map:<mapname>.<config opt>" */
|
|
char *map_name = strdup(term->config + sizeof("map:") - 1);
|
|
struct bpf_map *map;
|
|
int err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
|
|
char *map_opt;
|
|
size_t i;
|
|
|
|
if (!map_name)
|
|
return -ENOMEM;
|
|
|
|
map_opt = strchr(map_name, '.');
|
|
if (!map_opt) {
|
|
pr_debug("ERROR: Invalid map config: %s\n", map_name);
|
|
goto out;
|
|
}
|
|
|
|
*map_opt++ = '\0';
|
|
if (*map_opt == '\0') {
|
|
pr_debug("ERROR: Invalid map option: %s\n", term->config);
|
|
goto out;
|
|
}
|
|
|
|
map = bpf_object__find_map_by_name(obj, map_name);
|
|
if (!map) {
|
|
pr_debug("ERROR: Map %s doesn't exist\n", map_name);
|
|
err = -BPF_LOADER_ERRNO__OBJCONF_MAP_NOTEXIST;
|
|
goto out;
|
|
}
|
|
|
|
*key_scan_pos += strlen(map_opt);
|
|
err = config_map_indices_range_check(term, map, map_name);
|
|
if (err)
|
|
goto out;
|
|
*key_scan_pos -= strlen(map_opt);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(bpf_obj_config__map_funcs); i++) {
|
|
struct bpf_obj_config__map_func *func =
|
|
&bpf_obj_config__map_funcs[i];
|
|
|
|
if (strcmp(map_opt, func->config_opt) == 0) {
|
|
err = func->config_func(map, term, evlist);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
pr_debug("ERROR: Invalid map config option '%s'\n", map_opt);
|
|
err = -BPF_LOADER_ERRNO__OBJCONF_MAP_OPT;
|
|
out:
|
|
free(map_name);
|
|
if (!err)
|
|
key_scan_pos += strlen(map_opt);
|
|
return err;
|
|
}
|
|
|
|
int bpf__config_obj(struct bpf_object *obj,
|
|
struct parse_events_term *term,
|
|
struct perf_evlist *evlist,
|
|
int *error_pos)
|
|
{
|
|
int key_scan_pos = 0;
|
|
int err;
|
|
|
|
if (!obj || !term || !term->config)
|
|
return -EINVAL;
|
|
|
|
if (!prefixcmp(term->config, "map:")) {
|
|
key_scan_pos = sizeof("map:") - 1;
|
|
err = bpf__obj_config_map(obj, term, evlist, &key_scan_pos);
|
|
goto out;
|
|
}
|
|
err = -BPF_LOADER_ERRNO__OBJCONF_OPT;
|
|
out:
|
|
if (error_pos)
|
|
*error_pos = key_scan_pos;
|
|
return err;
|
|
|
|
}
|
|
|
|
typedef int (*map_config_func_t)(const char *name, int map_fd,
|
|
const struct bpf_map_def *pdef,
|
|
struct bpf_map_op *op,
|
|
void *pkey, void *arg);
|
|
|
|
static int
|
|
foreach_key_array_all(map_config_func_t func,
|
|
void *arg, const char *name,
|
|
int map_fd, const struct bpf_map_def *pdef,
|
|
struct bpf_map_op *op)
|
|
{
|
|
unsigned int i;
|
|
int err;
|
|
|
|
for (i = 0; i < pdef->max_entries; i++) {
|
|
err = func(name, map_fd, pdef, op, &i, arg);
|
|
if (err) {
|
|
pr_debug("ERROR: failed to insert value to %s[%u]\n",
|
|
name, i);
|
|
return err;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
foreach_key_array_ranges(map_config_func_t func, void *arg,
|
|
const char *name, int map_fd,
|
|
const struct bpf_map_def *pdef,
|
|
struct bpf_map_op *op)
|
|
{
|
|
unsigned int i, j;
|
|
int err;
|
|
|
|
for (i = 0; i < op->k.array.nr_ranges; i++) {
|
|
unsigned int start = op->k.array.ranges[i].start;
|
|
size_t length = op->k.array.ranges[i].length;
|
|
|
|
for (j = 0; j < length; j++) {
|
|
unsigned int idx = start + j;
|
|
|
|
err = func(name, map_fd, pdef, op, &idx, arg);
|
|
if (err) {
|
|
pr_debug("ERROR: failed to insert value to %s[%u]\n",
|
|
name, idx);
|
|
return err;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
bpf_map_config_foreach_key(struct bpf_map *map,
|
|
map_config_func_t func,
|
|
void *arg)
|
|
{
|
|
int err, map_fd;
|
|
struct bpf_map_op *op;
|
|
const struct bpf_map_def *def;
|
|
const char *name = bpf_map__name(map);
|
|
struct bpf_map_priv *priv = bpf_map__priv(map);
|
|
|
|
if (IS_ERR(priv)) {
|
|
pr_debug("ERROR: failed to get private from map %s\n", name);
|
|
return -BPF_LOADER_ERRNO__INTERNAL;
|
|
}
|
|
if (!priv || list_empty(&priv->ops_list)) {
|
|
pr_debug("INFO: nothing to config for map %s\n", name);
|
|
return 0;
|
|
}
|
|
|
|
def = bpf_map__def(map);
|
|
if (IS_ERR(def)) {
|
|
pr_debug("ERROR: failed to get definition from map %s\n", name);
|
|
return -BPF_LOADER_ERRNO__INTERNAL;
|
|
}
|
|
map_fd = bpf_map__fd(map);
|
|
if (map_fd < 0) {
|
|
pr_debug("ERROR: failed to get fd from map %s\n", name);
|
|
return map_fd;
|
|
}
|
|
|
|
list_for_each_entry(op, &priv->ops_list, list) {
|
|
switch (def->type) {
|
|
case BPF_MAP_TYPE_ARRAY:
|
|
case BPF_MAP_TYPE_PERF_EVENT_ARRAY:
|
|
switch (op->key_type) {
|
|
case BPF_MAP_KEY_ALL:
|
|
err = foreach_key_array_all(func, arg, name,
|
|
map_fd, def, op);
|
|
break;
|
|
case BPF_MAP_KEY_RANGES:
|
|
err = foreach_key_array_ranges(func, arg, name,
|
|
map_fd, def,
|
|
op);
|
|
break;
|
|
default:
|
|
pr_debug("ERROR: keytype for map '%s' invalid\n",
|
|
name);
|
|
return -BPF_LOADER_ERRNO__INTERNAL;
|
|
}
|
|
if (err)
|
|
return err;
|
|
break;
|
|
default:
|
|
pr_debug("ERROR: type of '%s' incorrect\n", name);
|
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
apply_config_value_for_key(int map_fd, void *pkey,
|
|
size_t val_size, u64 val)
|
|
{
|
|
int err = 0;
|
|
|
|
switch (val_size) {
|
|
case 1: {
|
|
u8 _val = (u8)(val);
|
|
err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
|
|
break;
|
|
}
|
|
case 2: {
|
|
u16 _val = (u16)(val);
|
|
err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
|
|
break;
|
|
}
|
|
case 4: {
|
|
u32 _val = (u32)(val);
|
|
err = bpf_map_update_elem(map_fd, pkey, &_val, BPF_ANY);
|
|
break;
|
|
}
|
|
case 8: {
|
|
err = bpf_map_update_elem(map_fd, pkey, &val, BPF_ANY);
|
|
break;
|
|
}
|
|
default:
|
|
pr_debug("ERROR: invalid value size\n");
|
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_VALUESIZE;
|
|
}
|
|
if (err && errno)
|
|
err = -errno;
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
apply_config_evsel_for_key(const char *name, int map_fd, void *pkey,
|
|
struct perf_evsel *evsel)
|
|
{
|
|
struct xyarray *xy = evsel->fd;
|
|
struct perf_event_attr *attr;
|
|
unsigned int key, events;
|
|
bool check_pass = false;
|
|
int *evt_fd;
|
|
int err;
|
|
|
|
if (!xy) {
|
|
pr_debug("ERROR: evsel not ready for map %s\n", name);
|
|
return -BPF_LOADER_ERRNO__INTERNAL;
|
|
}
|
|
|
|
if (xy->row_size / xy->entry_size != 1) {
|
|
pr_debug("ERROR: Dimension of target event is incorrect for map %s\n",
|
|
name);
|
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM;
|
|
}
|
|
|
|
attr = &evsel->attr;
|
|
if (attr->inherit) {
|
|
pr_debug("ERROR: Can't put inherit event into map %s\n", name);
|
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH;
|
|
}
|
|
|
|
if (perf_evsel__is_bpf_output(evsel))
|
|
check_pass = true;
|
|
if (attr->type == PERF_TYPE_RAW)
|
|
check_pass = true;
|
|
if (attr->type == PERF_TYPE_HARDWARE)
|
|
check_pass = true;
|
|
if (!check_pass) {
|
|
pr_debug("ERROR: Event type is wrong for map %s\n", name);
|
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE;
|
|
}
|
|
|
|
events = xy->entries / (xy->row_size / xy->entry_size);
|
|
key = *((unsigned int *)pkey);
|
|
if (key >= events) {
|
|
pr_debug("ERROR: there is no event %d for map %s\n",
|
|
key, name);
|
|
return -BPF_LOADER_ERRNO__OBJCONF_MAP_MAPSIZE;
|
|
}
|
|
evt_fd = xyarray__entry(xy, key, 0);
|
|
err = bpf_map_update_elem(map_fd, pkey, evt_fd, BPF_ANY);
|
|
if (err && errno)
|
|
err = -errno;
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
apply_obj_config_map_for_key(const char *name, int map_fd,
|
|
const struct bpf_map_def *pdef,
|
|
struct bpf_map_op *op,
|
|
void *pkey, void *arg __maybe_unused)
|
|
{
|
|
int err;
|
|
|
|
switch (op->op_type) {
|
|
case BPF_MAP_OP_SET_VALUE:
|
|
err = apply_config_value_for_key(map_fd, pkey,
|
|
pdef->value_size,
|
|
op->v.value);
|
|
break;
|
|
case BPF_MAP_OP_SET_EVSEL:
|
|
err = apply_config_evsel_for_key(name, map_fd, pkey,
|
|
op->v.evsel);
|
|
break;
|
|
default:
|
|
pr_debug("ERROR: unknown value type for '%s'\n", name);
|
|
err = -BPF_LOADER_ERRNO__INTERNAL;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
apply_obj_config_map(struct bpf_map *map)
|
|
{
|
|
return bpf_map_config_foreach_key(map,
|
|
apply_obj_config_map_for_key,
|
|
NULL);
|
|
}
|
|
|
|
static int
|
|
apply_obj_config_object(struct bpf_object *obj)
|
|
{
|
|
struct bpf_map *map;
|
|
int err;
|
|
|
|
bpf_map__for_each(map, obj) {
|
|
err = apply_obj_config_map(map);
|
|
if (err)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int bpf__apply_obj_config(void)
|
|
{
|
|
struct bpf_object *obj, *tmp;
|
|
int err;
|
|
|
|
bpf_object__for_each_safe(obj, tmp) {
|
|
err = apply_obj_config_object(obj);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define bpf__for_each_map(pos, obj, objtmp) \
|
|
bpf_object__for_each_safe(obj, objtmp) \
|
|
bpf_map__for_each(pos, obj)
|
|
|
|
#define bpf__for_each_stdout_map(pos, obj, objtmp) \
|
|
bpf__for_each_map(pos, obj, objtmp) \
|
|
if (bpf_map__name(pos) && \
|
|
(strcmp("__bpf_stdout__", \
|
|
bpf_map__name(pos)) == 0))
|
|
|
|
int bpf__setup_stdout(struct perf_evlist *evlist __maybe_unused)
|
|
{
|
|
struct bpf_map_priv *tmpl_priv = NULL;
|
|
struct bpf_object *obj, *tmp;
|
|
struct perf_evsel *evsel = NULL;
|
|
struct bpf_map *map;
|
|
int err;
|
|
bool need_init = false;
|
|
|
|
bpf__for_each_stdout_map(map, obj, tmp) {
|
|
struct bpf_map_priv *priv = bpf_map__priv(map);
|
|
|
|
if (IS_ERR(priv))
|
|
return -BPF_LOADER_ERRNO__INTERNAL;
|
|
|
|
/*
|
|
* No need to check map type: type should have been
|
|
* verified by kernel.
|
|
*/
|
|
if (!need_init && !priv)
|
|
need_init = !priv;
|
|
if (!tmpl_priv && priv)
|
|
tmpl_priv = priv;
|
|
}
|
|
|
|
if (!need_init)
|
|
return 0;
|
|
|
|
if (!tmpl_priv) {
|
|
err = parse_events(evlist, "bpf-output/no-inherit=1,name=__bpf_stdout__/",
|
|
NULL);
|
|
if (err) {
|
|
pr_debug("ERROR: failed to create bpf-output event\n");
|
|
return -err;
|
|
}
|
|
|
|
evsel = perf_evlist__last(evlist);
|
|
}
|
|
|
|
bpf__for_each_stdout_map(map, obj, tmp) {
|
|
struct bpf_map_priv *priv = bpf_map__priv(map);
|
|
|
|
if (IS_ERR(priv))
|
|
return -BPF_LOADER_ERRNO__INTERNAL;
|
|
if (priv)
|
|
continue;
|
|
|
|
if (tmpl_priv) {
|
|
priv = bpf_map_priv__clone(tmpl_priv);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
err = bpf_map__set_priv(map, priv, bpf_map_priv__clear);
|
|
if (err) {
|
|
bpf_map_priv__clear(map, priv);
|
|
return err;
|
|
}
|
|
} else if (evsel) {
|
|
struct bpf_map_op *op;
|
|
|
|
op = bpf_map__add_newop(map, NULL);
|
|
if (IS_ERR(op))
|
|
return PTR_ERR(op);
|
|
op->op_type = BPF_MAP_OP_SET_EVSEL;
|
|
op->v.evsel = evsel;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define ERRNO_OFFSET(e) ((e) - __BPF_LOADER_ERRNO__START)
|
|
#define ERRCODE_OFFSET(c) ERRNO_OFFSET(BPF_LOADER_ERRNO__##c)
|
|
#define NR_ERRNO (__BPF_LOADER_ERRNO__END - __BPF_LOADER_ERRNO__START)
|
|
|
|
static const char *bpf_loader_strerror_table[NR_ERRNO] = {
|
|
[ERRCODE_OFFSET(CONFIG)] = "Invalid config string",
|
|
[ERRCODE_OFFSET(GROUP)] = "Invalid group name",
|
|
[ERRCODE_OFFSET(EVENTNAME)] = "No event name found in config string",
|
|
[ERRCODE_OFFSET(INTERNAL)] = "BPF loader internal error",
|
|
[ERRCODE_OFFSET(COMPILE)] = "Error when compiling BPF scriptlet",
|
|
[ERRCODE_OFFSET(PROGCONF_TERM)] = "Invalid program config term in config string",
|
|
[ERRCODE_OFFSET(PROLOGUE)] = "Failed to generate prologue",
|
|
[ERRCODE_OFFSET(PROLOGUE2BIG)] = "Prologue too big for program",
|
|
[ERRCODE_OFFSET(PROLOGUEOOB)] = "Offset out of bound for prologue",
|
|
[ERRCODE_OFFSET(OBJCONF_OPT)] = "Invalid object config option",
|
|
[ERRCODE_OFFSET(OBJCONF_CONF)] = "Config value not set (missing '=')",
|
|
[ERRCODE_OFFSET(OBJCONF_MAP_OPT)] = "Invalid object map config option",
|
|
[ERRCODE_OFFSET(OBJCONF_MAP_NOTEXIST)] = "Target map doesn't exist",
|
|
[ERRCODE_OFFSET(OBJCONF_MAP_VALUE)] = "Incorrect value type for map",
|
|
[ERRCODE_OFFSET(OBJCONF_MAP_TYPE)] = "Incorrect map type",
|
|
[ERRCODE_OFFSET(OBJCONF_MAP_KEYSIZE)] = "Incorrect map key size",
|
|
[ERRCODE_OFFSET(OBJCONF_MAP_VALUESIZE)] = "Incorrect map value size",
|
|
[ERRCODE_OFFSET(OBJCONF_MAP_NOEVT)] = "Event not found for map setting",
|
|
[ERRCODE_OFFSET(OBJCONF_MAP_MAPSIZE)] = "Invalid map size for event setting",
|
|
[ERRCODE_OFFSET(OBJCONF_MAP_EVTDIM)] = "Event dimension too large",
|
|
[ERRCODE_OFFSET(OBJCONF_MAP_EVTINH)] = "Doesn't support inherit event",
|
|
[ERRCODE_OFFSET(OBJCONF_MAP_EVTTYPE)] = "Wrong event type for map",
|
|
[ERRCODE_OFFSET(OBJCONF_MAP_IDX2BIG)] = "Index too large",
|
|
};
|
|
|
|
static int
|
|
bpf_loader_strerror(int err, char *buf, size_t size)
|
|
{
|
|
char sbuf[STRERR_BUFSIZE];
|
|
const char *msg;
|
|
|
|
if (!buf || !size)
|
|
return -1;
|
|
|
|
err = err > 0 ? err : -err;
|
|
|
|
if (err >= __LIBBPF_ERRNO__START)
|
|
return libbpf_strerror(err, buf, size);
|
|
|
|
if (err >= __BPF_LOADER_ERRNO__START && err < __BPF_LOADER_ERRNO__END) {
|
|
msg = bpf_loader_strerror_table[ERRNO_OFFSET(err)];
|
|
snprintf(buf, size, "%s", msg);
|
|
buf[size - 1] = '\0';
|
|
return 0;
|
|
}
|
|
|
|
if (err >= __BPF_LOADER_ERRNO__END)
|
|
snprintf(buf, size, "Unknown bpf loader error %d", err);
|
|
else
|
|
snprintf(buf, size, "%s",
|
|
str_error_r(err, sbuf, sizeof(sbuf)));
|
|
|
|
buf[size - 1] = '\0';
|
|
return -1;
|
|
}
|
|
|
|
#define bpf__strerror_head(err, buf, size) \
|
|
char sbuf[STRERR_BUFSIZE], *emsg;\
|
|
if (!size)\
|
|
return 0;\
|
|
if (err < 0)\
|
|
err = -err;\
|
|
bpf_loader_strerror(err, sbuf, sizeof(sbuf));\
|
|
emsg = sbuf;\
|
|
switch (err) {\
|
|
default:\
|
|
scnprintf(buf, size, "%s", emsg);\
|
|
break;
|
|
|
|
#define bpf__strerror_entry(val, fmt...)\
|
|
case val: {\
|
|
scnprintf(buf, size, fmt);\
|
|
break;\
|
|
}
|
|
|
|
#define bpf__strerror_end(buf, size)\
|
|
}\
|
|
buf[size - 1] = '\0';
|
|
|
|
int bpf__strerror_prepare_load(const char *filename, bool source,
|
|
int err, char *buf, size_t size)
|
|
{
|
|
size_t n;
|
|
int ret;
|
|
|
|
n = snprintf(buf, size, "Failed to load %s%s: ",
|
|
filename, source ? " from source" : "");
|
|
if (n >= size) {
|
|
buf[size - 1] = '\0';
|
|
return 0;
|
|
}
|
|
buf += n;
|
|
size -= n;
|
|
|
|
ret = bpf_loader_strerror(err, buf, size);
|
|
buf[size - 1] = '\0';
|
|
return ret;
|
|
}
|
|
|
|
int bpf__strerror_probe(struct bpf_object *obj __maybe_unused,
|
|
int err, char *buf, size_t size)
|
|
{
|
|
bpf__strerror_head(err, buf, size);
|
|
case BPF_LOADER_ERRNO__PROGCONF_TERM: {
|
|
scnprintf(buf, size, "%s (add -v to see detail)", emsg);
|
|
break;
|
|
}
|
|
bpf__strerror_entry(EEXIST, "Probe point exist. Try 'perf probe -d \"*\"' and set 'force=yes'");
|
|
bpf__strerror_entry(EACCES, "You need to be root");
|
|
bpf__strerror_entry(EPERM, "You need to be root, and /proc/sys/kernel/kptr_restrict should be 0");
|
|
bpf__strerror_entry(ENOENT, "You need to check probing points in BPF file");
|
|
bpf__strerror_end(buf, size);
|
|
return 0;
|
|
}
|
|
|
|
int bpf__strerror_load(struct bpf_object *obj,
|
|
int err, char *buf, size_t size)
|
|
{
|
|
bpf__strerror_head(err, buf, size);
|
|
case LIBBPF_ERRNO__KVER: {
|
|
unsigned int obj_kver = bpf_object__kversion(obj);
|
|
unsigned int real_kver;
|
|
|
|
if (fetch_kernel_version(&real_kver, NULL, 0)) {
|
|
scnprintf(buf, size, "Unable to fetch kernel version");
|
|
break;
|
|
}
|
|
|
|
if (obj_kver != real_kver) {
|
|
scnprintf(buf, size,
|
|
"'version' ("KVER_FMT") doesn't match running kernel ("KVER_FMT")",
|
|
KVER_PARAM(obj_kver),
|
|
KVER_PARAM(real_kver));
|
|
break;
|
|
}
|
|
|
|
scnprintf(buf, size, "Failed to load program for unknown reason");
|
|
break;
|
|
}
|
|
bpf__strerror_end(buf, size);
|
|
return 0;
|
|
}
|
|
|
|
int bpf__strerror_config_obj(struct bpf_object *obj __maybe_unused,
|
|
struct parse_events_term *term __maybe_unused,
|
|
struct perf_evlist *evlist __maybe_unused,
|
|
int *error_pos __maybe_unused, int err,
|
|
char *buf, size_t size)
|
|
{
|
|
bpf__strerror_head(err, buf, size);
|
|
bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_TYPE,
|
|
"Can't use this config term with this map type");
|
|
bpf__strerror_end(buf, size);
|
|
return 0;
|
|
}
|
|
|
|
int bpf__strerror_apply_obj_config(int err, char *buf, size_t size)
|
|
{
|
|
bpf__strerror_head(err, buf, size);
|
|
bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTDIM,
|
|
"Cannot set event to BPF map in multi-thread tracing");
|
|
bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTINH,
|
|
"%s (Hint: use -i to turn off inherit)", emsg);
|
|
bpf__strerror_entry(BPF_LOADER_ERRNO__OBJCONF_MAP_EVTTYPE,
|
|
"Can only put raw, hardware and BPF output event into a BPF map");
|
|
bpf__strerror_end(buf, size);
|
|
return 0;
|
|
}
|
|
|
|
int bpf__strerror_setup_stdout(struct perf_evlist *evlist __maybe_unused,
|
|
int err, char *buf, size_t size)
|
|
{
|
|
bpf__strerror_head(err, buf, size);
|
|
bpf__strerror_end(buf, size);
|
|
return 0;
|
|
}
|