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 __weak; 27 void bpf_cpumask_release(struct bpf_cpumask *cpumask) __ksym __weak; 28 struct bpf_cpumask *bpf_cpumask_acquire(struct bpf_cpumask *cpumask) __ksym __weak; 29 u32 bpf_cpumask_first(const struct cpumask *cpumask) __ksym __weak; 30 u32 bpf_cpumask_first_zero(const struct cpumask *cpumask) __ksym __weak; 31 u32 bpf_cpumask_first_and(const struct cpumask *src1, 32 const struct cpumask *src2) __ksym __weak; 33 void bpf_cpumask_set_cpu(u32 cpu, struct bpf_cpumask *cpumask) __ksym __weak; 34 void bpf_cpumask_clear_cpu(u32 cpu, struct bpf_cpumask *cpumask) __ksym __weak; 35 bool bpf_cpumask_test_cpu(u32 cpu, const struct cpumask *cpumask) __ksym __weak; 36 bool bpf_cpumask_test_and_set_cpu(u32 cpu, struct bpf_cpumask *cpumask) __ksym __weak; 37 bool bpf_cpumask_test_and_clear_cpu(u32 cpu, struct bpf_cpumask *cpumask) __ksym __weak; 38 void bpf_cpumask_setall(struct bpf_cpumask *cpumask) __ksym __weak; 39 void bpf_cpumask_clear(struct bpf_cpumask *cpumask) __ksym __weak; 40 bool bpf_cpumask_and(struct bpf_cpumask *cpumask, 41 const struct cpumask *src1, 42 const struct cpumask *src2) __ksym __weak; 43 void bpf_cpumask_or(struct bpf_cpumask *cpumask, 44 const struct cpumask *src1, 45 const struct cpumask *src2) __ksym __weak; 46 void bpf_cpumask_xor(struct bpf_cpumask *cpumask, 47 const struct cpumask *src1, 48 const struct cpumask *src2) __ksym __weak; 49 bool bpf_cpumask_equal(const struct cpumask *src1, const struct cpumask *src2) __ksym __weak; 50 bool bpf_cpumask_intersects(const struct cpumask *src1, const struct cpumask *src2) __ksym __weak; 51 bool bpf_cpumask_subset(const struct cpumask *src1, const struct cpumask *src2) __ksym __weak; 52 bool bpf_cpumask_empty(const struct cpumask *cpumask) __ksym __weak; 53 bool bpf_cpumask_full(const struct cpumask *cpumask) __ksym __weak; 54 void bpf_cpumask_copy(struct bpf_cpumask *dst, const struct cpumask *src) __ksym __weak; 55 u32 bpf_cpumask_any_distribute(const struct cpumask *src) __ksym __weak; 56 u32 bpf_cpumask_any_and_distribute(const struct cpumask *src1, 57 const struct cpumask *src2) __ksym __weak; 58 u32 bpf_cpumask_weight(const struct cpumask *cpumask) __ksym __weak; 59 60 void bpf_rcu_read_lock(void) __ksym __weak; 61 void bpf_rcu_read_unlock(void) __ksym __weak; 62 63 static inline const struct cpumask *cast(struct bpf_cpumask *cpumask) 64 { 65 return (const struct cpumask *)cpumask; 66 } 67 68 static inline struct bpf_cpumask *create_cpumask(void) 69 { 70 struct bpf_cpumask *cpumask; 71 72 cpumask = bpf_cpumask_create(); 73 if (!cpumask) { 74 err = 1; 75 return NULL; 76 } 77 78 if (!bpf_cpumask_empty(cast(cpumask))) { 79 err = 2; 80 bpf_cpumask_release(cpumask); 81 return NULL; 82 } 83 84 return cpumask; 85 } 86 87 static inline struct __cpumask_map_value *cpumask_map_value_lookup(void) 88 { 89 u32 key = 0; 90 91 return bpf_map_lookup_elem(&__cpumask_map, &key); 92 } 93 94 static inline int cpumask_map_insert(struct bpf_cpumask *mask) 95 { 96 struct __cpumask_map_value local, *v; 97 long status; 98 struct bpf_cpumask *old; 99 u32 key = 0; 100 101 local.cpumask = NULL; 102 status = bpf_map_update_elem(&__cpumask_map, &key, &local, 0); 103 if (status) { 104 bpf_cpumask_release(mask); 105 return status; 106 } 107 108 v = bpf_map_lookup_elem(&__cpumask_map, &key); 109 if (!v) { 110 bpf_cpumask_release(mask); 111 return -ENOENT; 112 } 113 114 old = bpf_kptr_xchg(&v->cpumask, mask); 115 if (old) { 116 bpf_cpumask_release(old); 117 return -EEXIST; 118 } 119 120 return 0; 121 } 122 123 #endif /* _CPUMASK_COMMON_H */ 124