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eb3f595d MKL |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* Copyright (c) 2018 Facebook */ | |
3 | ||
4 | #ifndef _LINUX_BTF_H | |
5 | #define _LINUX_BTF_H 1 | |
6 | ||
7 | #include <linux/types.h> | |
8 | ||
9 | struct btf; | |
ffa0c1cf | 10 | struct btf_member; |
eb3f595d | 11 | struct btf_type; |
f56a653c | 12 | union bpf_attr; |
eb3f595d | 13 | |
60197cfb MKL |
14 | extern const struct file_operations btf_fops; |
15 | ||
f56a653c MKL |
16 | void btf_put(struct btf *btf); |
17 | int btf_new_fd(const union bpf_attr *attr); | |
18 | struct btf *btf_get_by_fd(int fd); | |
60197cfb MKL |
19 | int btf_get_info_by_fd(const struct btf *btf, |
20 | const union bpf_attr *attr, | |
21 | union bpf_attr __user *uattr); | |
eb3f595d MKL |
22 | /* Figure out the size of a type_id. If type_id is a modifier |
23 | * (e.g. const), it will be resolved to find out the type with size. | |
24 | * | |
25 | * For example: | |
26 | * In describing "const void *", type_id is "const" and "const" | |
27 | * refers to "void *". The return type will be "void *". | |
28 | * | |
29 | * If type_id is a simple "int", then return type will be "int". | |
30 | * | |
31 | * @btf: struct btf object | |
32 | * @type_id: Find out the size of type_id. The type_id of the return | |
33 | * type is set to *type_id. | |
34 | * @ret_size: It can be NULL. If not NULL, the size of the return | |
35 | * type is set to *ret_size. | |
36 | * Return: The btf_type (resolved to another type with size info if needed). | |
37 | * NULL is returned if type_id itself does not have size info | |
38 | * (e.g. void) or it cannot be resolved to another type that | |
39 | * has size info. | |
40 | * *type_id and *ret_size will not be changed in the | |
41 | * NULL return case. | |
42 | */ | |
43 | const struct btf_type *btf_type_id_size(const struct btf *btf, | |
44 | u32 *type_id, | |
45 | u32 *ret_size); | |
b00b8dae MKL |
46 | void btf_type_seq_show(const struct btf *btf, u32 type_id, void *obj, |
47 | struct seq_file *m); | |
78958fca MKL |
48 | int btf_get_fd_by_id(u32 id); |
49 | u32 btf_id(const struct btf *btf); | |
ffa0c1cf YS |
50 | bool btf_member_is_reg_int(const struct btf *btf, const struct btf_type *s, |
51 | const struct btf_member *m, | |
52 | u32 expected_offset, u32 expected_size); | |
f6161a8f YS |
53 | |
54 | #ifdef CONFIG_BPF_SYSCALL | |
838e9690 YS |
55 | const struct btf_type *btf_type_by_id(const struct btf *btf, u32 type_id); |
56 | const char *btf_name_by_offset(const struct btf *btf, u32 offset); | |
f6161a8f YS |
57 | #else |
58 | static inline const struct btf_type *btf_type_by_id(const struct btf *btf, | |
59 | u32 type_id) | |
60 | { | |
61 | return NULL; | |
62 | } | |
63 | static inline const char *btf_name_by_offset(const struct btf *btf, | |
64 | u32 offset) | |
65 | { | |
66 | return NULL; | |
67 | } | |
68 | #endif | |
eb3f595d MKL |
69 | |
70 | #endif |