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