1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_IA64_ATOMIC_H 3 #define _ASM_IA64_ATOMIC_H 4 5 /* 6 * Atomic operations that C can't guarantee us. Useful for 7 * resource counting etc.. 8 * 9 * NOTE: don't mess with the types below! The "unsigned long" and 10 * "int" types were carefully placed so as to ensure proper operation 11 * of the macros. 12 * 13 * Copyright (C) 1998, 1999, 2002-2003 Hewlett-Packard Co 14 * David Mosberger-Tang <davidm@hpl.hp.com> 15 */ 16 #include <linux/types.h> 17 18 #include <asm/intrinsics.h> 19 #include <asm/barrier.h> 20 21 22 #define ATOMIC64_INIT(i) { (i) } 23 24 #define atomic_read(v) READ_ONCE((v)->counter) 25 #define atomic64_read(v) READ_ONCE((v)->counter) 26 27 #define atomic_set(v,i) WRITE_ONCE(((v)->counter), (i)) 28 #define atomic64_set(v,i) WRITE_ONCE(((v)->counter), (i)) 29 30 #define ATOMIC_OP(op, c_op) \ 31 static __inline__ int \ 32 ia64_atomic_##op (int i, atomic_t *v) \ 33 { \ 34 __s32 old, new; \ 35 CMPXCHG_BUGCHECK_DECL \ 36 \ 37 do { \ 38 CMPXCHG_BUGCHECK(v); \ 39 old = atomic_read(v); \ 40 new = old c_op i; \ 41 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old); \ 42 return new; \ 43 } 44 45 #define ATOMIC_FETCH_OP(op, c_op) \ 46 static __inline__ int \ 47 ia64_atomic_fetch_##op (int i, atomic_t *v) \ 48 { \ 49 __s32 old, new; \ 50 CMPXCHG_BUGCHECK_DECL \ 51 \ 52 do { \ 53 CMPXCHG_BUGCHECK(v); \ 54 old = atomic_read(v); \ 55 new = old c_op i; \ 56 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old); \ 57 return old; \ 58 } 59 60 #define ATOMIC_OPS(op, c_op) \ 61 ATOMIC_OP(op, c_op) \ 62 ATOMIC_FETCH_OP(op, c_op) 63 64 ATOMIC_OPS(add, +) 65 ATOMIC_OPS(sub, -) 66 67 #ifdef __OPTIMIZE__ 68 #define __ia64_atomic_const(i) \ 69 static const int __ia64_atomic_p = __builtin_constant_p(i) ? \ 70 ((i) == 1 || (i) == 4 || (i) == 8 || (i) == 16 || \ 71 (i) == -1 || (i) == -4 || (i) == -8 || (i) == -16) : 0;\ 72 __ia64_atomic_p 73 #else 74 #define __ia64_atomic_const(i) 0 75 #endif 76 77 #define atomic_add_return(i,v) \ 78 ({ \ 79 int __ia64_aar_i = (i); \ 80 __ia64_atomic_const(i) \ 81 ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \ 82 : ia64_atomic_add(__ia64_aar_i, v); \ 83 }) 84 85 #define atomic_sub_return(i,v) \ 86 ({ \ 87 int __ia64_asr_i = (i); \ 88 __ia64_atomic_const(i) \ 89 ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \ 90 : ia64_atomic_sub(__ia64_asr_i, v); \ 91 }) 92 93 #define atomic_fetch_add(i,v) \ 94 ({ \ 95 int __ia64_aar_i = (i); \ 96 __ia64_atomic_const(i) \ 97 ? ia64_fetchadd(__ia64_aar_i, &(v)->counter, acq) \ 98 : ia64_atomic_fetch_add(__ia64_aar_i, v); \ 99 }) 100 101 #define atomic_fetch_sub(i,v) \ 102 ({ \ 103 int __ia64_asr_i = (i); \ 104 __ia64_atomic_const(i) \ 105 ? ia64_fetchadd(-__ia64_asr_i, &(v)->counter, acq) \ 106 : ia64_atomic_fetch_sub(__ia64_asr_i, v); \ 107 }) 108 109 ATOMIC_FETCH_OP(and, &) 110 ATOMIC_FETCH_OP(or, |) 111 ATOMIC_FETCH_OP(xor, ^) 112 113 #define atomic_and(i,v) (void)ia64_atomic_fetch_and(i,v) 114 #define atomic_or(i,v) (void)ia64_atomic_fetch_or(i,v) 115 #define atomic_xor(i,v) (void)ia64_atomic_fetch_xor(i,v) 116 117 #define atomic_fetch_and(i,v) ia64_atomic_fetch_and(i,v) 118 #define atomic_fetch_or(i,v) ia64_atomic_fetch_or(i,v) 119 #define atomic_fetch_xor(i,v) ia64_atomic_fetch_xor(i,v) 120 121 #undef ATOMIC_OPS 122 #undef ATOMIC_FETCH_OP 123 #undef ATOMIC_OP 124 125 #define ATOMIC64_OP(op, c_op) \ 126 static __inline__ s64 \ 127 ia64_atomic64_##op (s64 i, atomic64_t *v) \ 128 { \ 129 s64 old, new; \ 130 CMPXCHG_BUGCHECK_DECL \ 131 \ 132 do { \ 133 CMPXCHG_BUGCHECK(v); \ 134 old = atomic64_read(v); \ 135 new = old c_op i; \ 136 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old); \ 137 return new; \ 138 } 139 140 #define ATOMIC64_FETCH_OP(op, c_op) \ 141 static __inline__ s64 \ 142 ia64_atomic64_fetch_##op (s64 i, atomic64_t *v) \ 143 { \ 144 s64 old, new; \ 145 CMPXCHG_BUGCHECK_DECL \ 146 \ 147 do { \ 148 CMPXCHG_BUGCHECK(v); \ 149 old = atomic64_read(v); \ 150 new = old c_op i; \ 151 } while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old); \ 152 return old; \ 153 } 154 155 #define ATOMIC64_OPS(op, c_op) \ 156 ATOMIC64_OP(op, c_op) \ 157 ATOMIC64_FETCH_OP(op, c_op) 158 159 ATOMIC64_OPS(add, +) 160 ATOMIC64_OPS(sub, -) 161 162 #define atomic64_add_return(i,v) \ 163 ({ \ 164 s64 __ia64_aar_i = (i); \ 165 __ia64_atomic_const(i) \ 166 ? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \ 167 : ia64_atomic64_add(__ia64_aar_i, v); \ 168 }) 169 170 #define atomic64_sub_return(i,v) \ 171 ({ \ 172 s64 __ia64_asr_i = (i); \ 173 __ia64_atomic_const(i) \ 174 ? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \ 175 : ia64_atomic64_sub(__ia64_asr_i, v); \ 176 }) 177 178 #define atomic64_fetch_add(i,v) \ 179 ({ \ 180 s64 __ia64_aar_i = (i); \ 181 __ia64_atomic_const(i) \ 182 ? ia64_fetchadd(__ia64_aar_i, &(v)->counter, acq) \ 183 : ia64_atomic64_fetch_add(__ia64_aar_i, v); \ 184 }) 185 186 #define atomic64_fetch_sub(i,v) \ 187 ({ \ 188 s64 __ia64_asr_i = (i); \ 189 __ia64_atomic_const(i) \ 190 ? ia64_fetchadd(-__ia64_asr_i, &(v)->counter, acq) \ 191 : ia64_atomic64_fetch_sub(__ia64_asr_i, v); \ 192 }) 193 194 ATOMIC64_FETCH_OP(and, &) 195 ATOMIC64_FETCH_OP(or, |) 196 ATOMIC64_FETCH_OP(xor, ^) 197 198 #define atomic64_and(i,v) (void)ia64_atomic64_fetch_and(i,v) 199 #define atomic64_or(i,v) (void)ia64_atomic64_fetch_or(i,v) 200 #define atomic64_xor(i,v) (void)ia64_atomic64_fetch_xor(i,v) 201 202 #define atomic64_fetch_and(i,v) ia64_atomic64_fetch_and(i,v) 203 #define atomic64_fetch_or(i,v) ia64_atomic64_fetch_or(i,v) 204 #define atomic64_fetch_xor(i,v) ia64_atomic64_fetch_xor(i,v) 205 206 #undef ATOMIC64_OPS 207 #undef ATOMIC64_FETCH_OP 208 #undef ATOMIC64_OP 209 210 #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new)) 211 #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) 212 213 #define atomic64_cmpxchg(v, old, new) \ 214 (cmpxchg(&((v)->counter), old, new)) 215 #define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) 216 217 #define atomic_add(i,v) (void)atomic_add_return((i), (v)) 218 #define atomic_sub(i,v) (void)atomic_sub_return((i), (v)) 219 220 #define atomic64_add(i,v) (void)atomic64_add_return((i), (v)) 221 #define atomic64_sub(i,v) (void)atomic64_sub_return((i), (v)) 222 223 #endif /* _ASM_IA64_ATOMIC_H */ 224
