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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
3
4#ifndef _CPUMASK_COMMON_H
5#define _CPUMASK_COMMON_H
6
7#include "errno.h"
8#include <stdbool.h>
9
10int err;
11
12#define private(name) SEC(".bss." #name) __hidden __attribute__((aligned(8)))
13private(MASK) static struct bpf_cpumask __kptr * global_mask;
14
15struct __cpumask_map_value {
16 struct bpf_cpumask __kptr * cpumask;
17};
18
19struct array_map {
20 __uint(type, BPF_MAP_TYPE_ARRAY);
21 __type(key, int);
22 __type(value, struct __cpumask_map_value);
23 __uint(max_entries, 1);
24} __cpumask_map SEC(".maps");
25
26struct bpf_cpumask *bpf_cpumask_create(void) __ksym;
27void bpf_cpumask_release(struct bpf_cpumask *cpumask) __ksym;
28struct bpf_cpumask *bpf_cpumask_acquire(struct bpf_cpumask *cpumask) __ksym;
29u32 bpf_cpumask_first(const struct cpumask *cpumask) __ksym;
30u32 bpf_cpumask_first_zero(const struct cpumask *cpumask) __ksym;
31u32 bpf_cpumask_first_and(const struct cpumask *src1,
32 const struct cpumask *src2) __ksym;
33void bpf_cpumask_set_cpu(u32 cpu, struct bpf_cpumask *cpumask) __ksym;
34void bpf_cpumask_clear_cpu(u32 cpu, struct bpf_cpumask *cpumask) __ksym;
35bool bpf_cpumask_test_cpu(u32 cpu, const struct cpumask *cpumask) __ksym;
36bool bpf_cpumask_test_and_set_cpu(u32 cpu, struct bpf_cpumask *cpumask) __ksym;
37bool bpf_cpumask_test_and_clear_cpu(u32 cpu, struct bpf_cpumask *cpumask) __ksym;
38void bpf_cpumask_setall(struct bpf_cpumask *cpumask) __ksym;
39void bpf_cpumask_clear(struct bpf_cpumask *cpumask) __ksym;
40bool bpf_cpumask_and(struct bpf_cpumask *cpumask,
41 const struct cpumask *src1,
42 const struct cpumask *src2) __ksym;
43void bpf_cpumask_or(struct bpf_cpumask *cpumask,
44 const struct cpumask *src1,
45 const struct cpumask *src2) __ksym;
46void bpf_cpumask_xor(struct bpf_cpumask *cpumask,
47 const struct cpumask *src1,
48 const struct cpumask *src2) __ksym;
49bool bpf_cpumask_equal(const struct cpumask *src1, const struct cpumask *src2) __ksym;
50bool bpf_cpumask_intersects(const struct cpumask *src1, const struct cpumask *src2) __ksym;
51bool bpf_cpumask_subset(const struct cpumask *src1, const struct cpumask *src2) __ksym;
52bool bpf_cpumask_empty(const struct cpumask *cpumask) __ksym;
53bool bpf_cpumask_full(const struct cpumask *cpumask) __ksym;
54void bpf_cpumask_copy(struct bpf_cpumask *dst, const struct cpumask *src) __ksym;
55u32 bpf_cpumask_any_distribute(const struct cpumask *src) __ksym;
56u32 bpf_cpumask_any_and_distribute(const struct cpumask *src1, const struct cpumask *src2) __ksym;
57u32 bpf_cpumask_weight(const struct cpumask *cpumask) __ksym;
58
59void bpf_rcu_read_lock(void) __ksym;
60void bpf_rcu_read_unlock(void) __ksym;
61
62static inline const struct cpumask *cast(struct bpf_cpumask *cpumask)
63{
64 return (const struct cpumask *)cpumask;
65}
66
67static inline struct bpf_cpumask *create_cpumask(void)
68{
69 struct bpf_cpumask *cpumask;
70
71 cpumask = bpf_cpumask_create();
72 if (!cpumask) {
73 err = 1;
74 return NULL;
75 }
76
77 if (!bpf_cpumask_empty(cast(cpumask))) {
78 err = 2;
79 bpf_cpumask_release(cpumask);
80 return NULL;
81 }
82
83 return cpumask;
84}
85
86static inline struct __cpumask_map_value *cpumask_map_value_lookup(void)
87{
88 u32 key = 0;
89
90 return bpf_map_lookup_elem(&__cpumask_map, &key);
91}
92
93static inline int cpumask_map_insert(struct bpf_cpumask *mask)
94{
95 struct __cpumask_map_value local, *v;
96 long status;
97 struct bpf_cpumask *old;
98 u32 key = 0;
99
100 local.cpumask = NULL;
101 status = bpf_map_update_elem(&__cpumask_map, &key, &local, 0);
102 if (status) {
103 bpf_cpumask_release(mask);
104 return status;
105 }
106
107 v = bpf_map_lookup_elem(&__cpumask_map, &key);
108 if (!v) {
109 bpf_cpumask_release(mask);
110 return -ENOENT;
111 }
112
113 old = bpf_kptr_xchg(&v->cpumask, mask);
114 if (old) {
115 bpf_cpumask_release(old);
116 return -EEXIST;
117 }
118
119 return 0;
120}
121
122#endif /* _CPUMASK_COMMON_H */