1 /* 2 * Based on arch/arm/include/asm/atomic.h 3 * 4 * Copyright (C) 1996 Russell King. 5 * Copyright (C) 2002 Deep Blue Solutions Ltd. 6 * Copyright (C) 2012 ARM Ltd. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program. If not, see <http://www.gnu.org/licenses/>. 19 */ 20 #ifndef __ASM_ATOMIC_H 21 #define __ASM_ATOMIC_H 22 23 #include <linux/compiler.h> 24 #include <linux/types.h> 25 26 #include <asm/barrier.h> 27 #include <asm/lse.h> 28 29 #ifdef __KERNEL__ 30 31 #define __ARM64_IN_ATOMIC_IMPL 32 33 #if defined(CONFIG_ARM64_LSE_ATOMICS) && defined(CONFIG_AS_LSE) 34 #include <asm/atomic_lse.h> 35 #else 36 #include <asm/atomic_ll_sc.h> 37 #endif 38 39 #undef __ARM64_IN_ATOMIC_IMPL 40 41 #include <asm/cmpxchg.h> 42 43 #define ___atomic_add_unless(v, a, u, sfx) \ 44 ({ \ 45 typeof((v)->counter) c, old; \ 46 \ 47 c = atomic##sfx##_read(v); \ 48 while (c != (u) && \ 49 (old = atomic##sfx##_cmpxchg((v), c, c + (a))) != c) \ 50 c = old; \ 51 c; \ 52 }) 53 54 #define ATOMIC_INIT(i) { (i) } 55 56 #define atomic_read(v) READ_ONCE((v)->counter) 57 #define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i)) 58 59 #define atomic_add_return_relaxed atomic_add_return_relaxed 60 #define atomic_add_return_acquire atomic_add_return_acquire 61 #define atomic_add_return_release atomic_add_return_release 62 #define atomic_add_return atomic_add_return 63 64 #define atomic_inc_return_relaxed(v) atomic_add_return_relaxed(1, (v)) 65 #define atomic_inc_return_acquire(v) atomic_add_return_acquire(1, (v)) 66 #define atomic_inc_return_release(v) atomic_add_return_release(1, (v)) 67 #define atomic_inc_return(v) atomic_add_return(1, (v)) 68 69 #define atomic_sub_return_relaxed atomic_sub_return_relaxed 70 #define atomic_sub_return_acquire atomic_sub_return_acquire 71 #define atomic_sub_return_release atomic_sub_return_release 72 #define atomic_sub_return atomic_sub_return 73 74 #define atomic_dec_return_relaxed(v) atomic_sub_return_relaxed(1, (v)) 75 #define atomic_dec_return_acquire(v) atomic_sub_return_acquire(1, (v)) 76 #define atomic_dec_return_release(v) atomic_sub_return_release(1, (v)) 77 #define atomic_dec_return(v) atomic_sub_return(1, (v)) 78 79 #define atomic_xchg_relaxed(v, new) xchg_relaxed(&((v)->counter), (new)) 80 #define atomic_xchg_acquire(v, new) xchg_acquire(&((v)->counter), (new)) 81 #define atomic_xchg_release(v, new) xchg_release(&((v)->counter), (new)) 82 #define atomic_xchg(v, new) xchg(&((v)->counter), (new)) 83 84 #define atomic_cmpxchg_relaxed(v, old, new) \ 85 cmpxchg_relaxed(&((v)->counter), (old), (new)) 86 #define atomic_cmpxchg_acquire(v, old, new) \ 87 cmpxchg_acquire(&((v)->counter), (old), (new)) 88 #define atomic_cmpxchg_release(v, old, new) \ 89 cmpxchg_release(&((v)->counter), (old), (new)) 90 #define atomic_cmpxchg(v, old, new) cmpxchg(&((v)->counter), (old), (new)) 91 92 #define atomic_inc(v) atomic_add(1, (v)) 93 #define atomic_dec(v) atomic_sub(1, (v)) 94 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) 95 #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0) 96 #define atomic_sub_and_test(i, v) (atomic_sub_return((i), (v)) == 0) 97 #define atomic_add_negative(i, v) (atomic_add_return((i), (v)) < 0) 98 #define __atomic_add_unless(v, a, u) ___atomic_add_unless(v, a, u,) 99 #define atomic_andnot atomic_andnot 100 101 /* 102 * 64-bit atomic operations. 103 */ 104 #define ATOMIC64_INIT ATOMIC_INIT 105 #define atomic64_read atomic_read 106 #define atomic64_set atomic_set 107 108 #define atomic64_add_return_relaxed atomic64_add_return_relaxed 109 #define atomic64_add_return_acquire atomic64_add_return_acquire 110 #define atomic64_add_return_release atomic64_add_return_release 111 #define atomic64_add_return atomic64_add_return 112 113 #define atomic64_inc_return_relaxed(v) atomic64_add_return_relaxed(1, (v)) 114 #define atomic64_inc_return_acquire(v) atomic64_add_return_acquire(1, (v)) 115 #define atomic64_inc_return_release(v) atomic64_add_return_release(1, (v)) 116 #define atomic64_inc_return(v) atomic64_add_return(1, (v)) 117 118 #define atomic64_sub_return_relaxed atomic64_sub_return_relaxed 119 #define atomic64_sub_return_acquire atomic64_sub_return_acquire 120 #define atomic64_sub_return_release atomic64_sub_return_release 121 #define atomic64_sub_return atomic64_sub_return 122 123 #define atomic64_dec_return_relaxed(v) atomic64_sub_return_relaxed(1, (v)) 124 #define atomic64_dec_return_acquire(v) atomic64_sub_return_acquire(1, (v)) 125 #define atomic64_dec_return_release(v) atomic64_sub_return_release(1, (v)) 126 #define atomic64_dec_return(v) atomic64_sub_return(1, (v)) 127 128 #define atomic64_xchg_relaxed atomic_xchg_relaxed 129 #define atomic64_xchg_acquire atomic_xchg_acquire 130 #define atomic64_xchg_release atomic_xchg_release 131 #define atomic64_xchg atomic_xchg 132 133 #define atomic64_cmpxchg_relaxed atomic_cmpxchg_relaxed 134 #define atomic64_cmpxchg_acquire atomic_cmpxchg_acquire 135 #define atomic64_cmpxchg_release atomic_cmpxchg_release 136 #define atomic64_cmpxchg atomic_cmpxchg 137 138 #define atomic64_inc(v) atomic64_add(1, (v)) 139 #define atomic64_dec(v) atomic64_sub(1, (v)) 140 #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) 141 #define atomic64_dec_and_test(v) (atomic64_dec_return(v) == 0) 142 #define atomic64_sub_and_test(i, v) (atomic64_sub_return((i), (v)) == 0) 143 #define atomic64_add_negative(i, v) (atomic64_add_return((i), (v)) < 0) 144 #define atomic64_add_unless(v, a, u) (___atomic_add_unless(v, a, u, 64) != u) 145 #define atomic64_andnot atomic64_andnot 146 147 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) 148 149 #endif 150 #endif 151