1// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2
3#include "util/bpf_map.h"
4#include <bpf/bpf.h>
5#include <bpf/libbpf.h>
6#include <linux/err.h>
7#include <linux/kernel.h>
8#include <errno.h>
9#include <stdbool.h>
10#include <stdlib.h>
11#include <unistd.h>
12
13static bool bpf_map__is_per_cpu(enum bpf_map_type type)
14{
15 return type == BPF_MAP_TYPE_PERCPU_HASH ||
16 type == BPF_MAP_TYPE_PERCPU_ARRAY ||
17 type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
18 type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE;
19}
20
21static void *bpf_map__alloc_value(const struct bpf_map *map)
22{
23 if (bpf_map__is_per_cpu(bpf_map__type(map)))
24 return malloc(round_up(bpf_map__value_size(map), 8) *
25 sysconf(_SC_NPROCESSORS_CONF));
26
27 return malloc(bpf_map__value_size(map));
28}
29
30int bpf_map__fprintf(struct bpf_map *map, FILE *fp)
31{
32 void *prev_key = NULL, *key, *value;
33 int fd = bpf_map__fd(map), err;
34 int printed = 0;
35
36 if (fd < 0)
37 return fd;
38
39 err = -ENOMEM;
40 key = malloc(bpf_map__key_size(map));
41 if (key == NULL)
42 goto out;
43
44 value = bpf_map__alloc_value(map);
45 if (value == NULL)
46 goto out_free_key;
47
48 while ((err = bpf_map_get_next_key(fd, prev_key, key) == 0)) {
49 int intkey = *(int *)key;
50
51 if (!bpf_map_lookup_elem(fd, key, value)) {
52 bool boolval = *(bool *)value;
53 if (boolval)
54 printed += fprintf(fp, "[%d] = %d,\n", intkey, boolval);
55 } else {
56 printed += fprintf(fp, "[%d] = ERROR,\n", intkey);
57 }
58
59 prev_key = key;
60 }
61
62 if (err == ENOENT)
63 err = printed;
64
65 free(value);
66out_free_key:
67 free(key);
68out:
69 return err;
70}
71

source code of linux/tools/perf/util/bpf_map.c