Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 2 | #ifndef _ASM_POWERPC_ATOMIC_H_ |
| 3 | #define _ASM_POWERPC_ATOMIC_H_ |
| 4 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | /* |
| 6 | * PowerPC atomic operations |
| 7 | */ |
| 8 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #ifdef __KERNEL__ |
David Howells | ae3a197 | 2012-03-28 18:30:02 +0100 | [diff] [blame] | 10 | #include <linux/types.h> |
| 11 | #include <asm/cmpxchg.h> |
Peter Zijlstra | c645073 | 2014-03-13 19:00:35 +0100 | [diff] [blame] | 12 | #include <asm/barrier.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 14 | #define ATOMIC_INIT(i) { (i) } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 16 | /* |
| 17 | * Since *_return_relaxed and {cmp}xchg_relaxed are implemented with |
| 18 | * a "bne-" instruction at the end, so an isync is enough as a acquire barrier |
| 19 | * on the platform without lwsync. |
| 20 | */ |
| 21 | #define __atomic_op_acquire(op, args...) \ |
| 22 | ({ \ |
| 23 | typeof(op##_relaxed(args)) __ret = op##_relaxed(args); \ |
| 24 | __asm__ __volatile__(PPC_ACQUIRE_BARRIER "" : : : "memory"); \ |
| 25 | __ret; \ |
| 26 | }) |
| 27 | |
| 28 | #define __atomic_op_release(op, args...) \ |
| 29 | ({ \ |
| 30 | __asm__ __volatile__(PPC_RELEASE_BARRIER "" : : : "memory"); \ |
| 31 | op##_relaxed(args); \ |
| 32 | }) |
| 33 | |
Segher Boessenkool | 9f0cbea | 2007-08-11 10:15:30 +1000 | [diff] [blame] | 34 | static __inline__ int atomic_read(const atomic_t *v) |
| 35 | { |
| 36 | int t; |
| 37 | |
| 38 | __asm__ __volatile__("lwz%U1%X1 %0,%1" : "=r"(t) : "m"(v->counter)); |
| 39 | |
| 40 | return t; |
| 41 | } |
| 42 | |
| 43 | static __inline__ void atomic_set(atomic_t *v, int i) |
| 44 | { |
| 45 | __asm__ __volatile__("stw%U0%X0 %1,%0" : "=m"(v->counter) : "r"(i)); |
| 46 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Peter Zijlstra | af095dd | 2014-03-26 18:11:31 +0100 | [diff] [blame] | 48 | #define ATOMIC_OP(op, asm_op) \ |
| 49 | static __inline__ void atomic_##op(int a, atomic_t *v) \ |
| 50 | { \ |
| 51 | int t; \ |
| 52 | \ |
| 53 | __asm__ __volatile__( \ |
| 54 | "1: lwarx %0,0,%3 # atomic_" #op "\n" \ |
| 55 | #asm_op " %0,%2,%0\n" \ |
| 56 | PPC405_ERR77(0,%3) \ |
| 57 | " stwcx. %0,0,%3 \n" \ |
| 58 | " bne- 1b\n" \ |
| 59 | : "=&r" (t), "+m" (v->counter) \ |
| 60 | : "r" (a), "r" (&v->counter) \ |
| 61 | : "cc"); \ |
| 62 | } \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 64 | #define ATOMIC_OP_RETURN_RELAXED(op, asm_op) \ |
| 65 | static inline int atomic_##op##_return_relaxed(int a, atomic_t *v) \ |
Peter Zijlstra | af095dd | 2014-03-26 18:11:31 +0100 | [diff] [blame] | 66 | { \ |
| 67 | int t; \ |
| 68 | \ |
| 69 | __asm__ __volatile__( \ |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 70 | "1: lwarx %0,0,%3 # atomic_" #op "_return_relaxed\n" \ |
| 71 | #asm_op " %0,%2,%0\n" \ |
| 72 | PPC405_ERR77(0, %3) \ |
| 73 | " stwcx. %0,0,%3\n" \ |
Peter Zijlstra | af095dd | 2014-03-26 18:11:31 +0100 | [diff] [blame] | 74 | " bne- 1b\n" \ |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 75 | : "=&r" (t), "+m" (v->counter) \ |
Peter Zijlstra | af095dd | 2014-03-26 18:11:31 +0100 | [diff] [blame] | 76 | : "r" (a), "r" (&v->counter) \ |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 77 | : "cc"); \ |
Peter Zijlstra | af095dd | 2014-03-26 18:11:31 +0100 | [diff] [blame] | 78 | \ |
| 79 | return t; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | } |
| 81 | |
Peter Zijlstra | a28cc7b | 2016-04-18 01:16:05 +0200 | [diff] [blame] | 82 | #define ATOMIC_FETCH_OP_RELAXED(op, asm_op) \ |
| 83 | static inline int atomic_fetch_##op##_relaxed(int a, atomic_t *v) \ |
| 84 | { \ |
| 85 | int res, t; \ |
| 86 | \ |
| 87 | __asm__ __volatile__( \ |
| 88 | "1: lwarx %0,0,%4 # atomic_fetch_" #op "_relaxed\n" \ |
| 89 | #asm_op " %1,%3,%0\n" \ |
| 90 | PPC405_ERR77(0, %4) \ |
| 91 | " stwcx. %1,0,%4\n" \ |
| 92 | " bne- 1b\n" \ |
| 93 | : "=&r" (res), "=&r" (t), "+m" (v->counter) \ |
| 94 | : "r" (a), "r" (&v->counter) \ |
| 95 | : "cc"); \ |
| 96 | \ |
| 97 | return res; \ |
| 98 | } |
| 99 | |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 100 | #define ATOMIC_OPS(op, asm_op) \ |
| 101 | ATOMIC_OP(op, asm_op) \ |
Peter Zijlstra | a28cc7b | 2016-04-18 01:16:05 +0200 | [diff] [blame] | 102 | ATOMIC_OP_RETURN_RELAXED(op, asm_op) \ |
| 103 | ATOMIC_FETCH_OP_RELAXED(op, asm_op) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
Peter Zijlstra | af095dd | 2014-03-26 18:11:31 +0100 | [diff] [blame] | 105 | ATOMIC_OPS(add, add) |
| 106 | ATOMIC_OPS(sub, subf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 108 | #define atomic_add_return_relaxed atomic_add_return_relaxed |
| 109 | #define atomic_sub_return_relaxed atomic_sub_return_relaxed |
| 110 | |
Peter Zijlstra | a28cc7b | 2016-04-18 01:16:05 +0200 | [diff] [blame] | 111 | #define atomic_fetch_add_relaxed atomic_fetch_add_relaxed |
| 112 | #define atomic_fetch_sub_relaxed atomic_fetch_sub_relaxed |
| 113 | |
Peter Zijlstra | af095dd | 2014-03-26 18:11:31 +0100 | [diff] [blame] | 114 | #undef ATOMIC_OPS |
Peter Zijlstra | a28cc7b | 2016-04-18 01:16:05 +0200 | [diff] [blame] | 115 | #define ATOMIC_OPS(op, asm_op) \ |
| 116 | ATOMIC_OP(op, asm_op) \ |
| 117 | ATOMIC_FETCH_OP_RELAXED(op, asm_op) |
| 118 | |
| 119 | ATOMIC_OPS(and, and) |
| 120 | ATOMIC_OPS(or, or) |
| 121 | ATOMIC_OPS(xor, xor) |
| 122 | |
| 123 | #define atomic_fetch_and_relaxed atomic_fetch_and_relaxed |
| 124 | #define atomic_fetch_or_relaxed atomic_fetch_or_relaxed |
| 125 | #define atomic_fetch_xor_relaxed atomic_fetch_xor_relaxed |
| 126 | |
| 127 | #undef ATOMIC_OPS |
| 128 | #undef ATOMIC_FETCH_OP_RELAXED |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 129 | #undef ATOMIC_OP_RETURN_RELAXED |
Peter Zijlstra | af095dd | 2014-03-26 18:11:31 +0100 | [diff] [blame] | 130 | #undef ATOMIC_OP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | static __inline__ void atomic_inc(atomic_t *v) |
| 133 | { |
| 134 | int t; |
| 135 | |
| 136 | __asm__ __volatile__( |
| 137 | "1: lwarx %0,0,%2 # atomic_inc\n\ |
| 138 | addic %0,%0,1\n" |
| 139 | PPC405_ERR77(0,%2) |
| 140 | " stwcx. %0,0,%2 \n\ |
| 141 | bne- 1b" |
Linus Torvalds | e2a3d40 | 2006-07-08 15:00:28 -0700 | [diff] [blame] | 142 | : "=&r" (t), "+m" (v->counter) |
| 143 | : "r" (&v->counter) |
Paul Mackerras | efc3624 | 2008-11-05 18:39:27 +0000 | [diff] [blame] | 144 | : "cc", "xer"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | } |
Mark Rutland | 9837559 | 2018-06-21 13:13:19 +0100 | [diff] [blame] | 146 | #define atomic_inc atomic_inc |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 148 | static __inline__ int atomic_inc_return_relaxed(atomic_t *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | { |
| 150 | int t; |
| 151 | |
| 152 | __asm__ __volatile__( |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 153 | "1: lwarx %0,0,%2 # atomic_inc_return_relaxed\n" |
| 154 | " addic %0,%0,1\n" |
| 155 | PPC405_ERR77(0, %2) |
| 156 | " stwcx. %0,0,%2\n" |
| 157 | " bne- 1b" |
| 158 | : "=&r" (t), "+m" (v->counter) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | : "r" (&v->counter) |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 160 | : "cc", "xer"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | |
| 162 | return t; |
| 163 | } |
| 164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | static __inline__ void atomic_dec(atomic_t *v) |
| 166 | { |
| 167 | int t; |
| 168 | |
| 169 | __asm__ __volatile__( |
| 170 | "1: lwarx %0,0,%2 # atomic_dec\n\ |
| 171 | addic %0,%0,-1\n" |
| 172 | PPC405_ERR77(0,%2)\ |
| 173 | " stwcx. %0,0,%2\n\ |
| 174 | bne- 1b" |
Linus Torvalds | e2a3d40 | 2006-07-08 15:00:28 -0700 | [diff] [blame] | 175 | : "=&r" (t), "+m" (v->counter) |
| 176 | : "r" (&v->counter) |
Paul Mackerras | efc3624 | 2008-11-05 18:39:27 +0000 | [diff] [blame] | 177 | : "cc", "xer"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | } |
Mark Rutland | 9837559 | 2018-06-21 13:13:19 +0100 | [diff] [blame] | 179 | #define atomic_dec atomic_dec |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 181 | static __inline__ int atomic_dec_return_relaxed(atomic_t *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | { |
| 183 | int t; |
| 184 | |
| 185 | __asm__ __volatile__( |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 186 | "1: lwarx %0,0,%2 # atomic_dec_return_relaxed\n" |
| 187 | " addic %0,%0,-1\n" |
| 188 | PPC405_ERR77(0, %2) |
| 189 | " stwcx. %0,0,%2\n" |
| 190 | " bne- 1b" |
| 191 | : "=&r" (t), "+m" (v->counter) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | : "r" (&v->counter) |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 193 | : "cc", "xer"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
| 195 | return t; |
| 196 | } |
| 197 | |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 198 | #define atomic_inc_return_relaxed atomic_inc_return_relaxed |
| 199 | #define atomic_dec_return_relaxed atomic_dec_return_relaxed |
| 200 | |
Mathieu Desnoyers | f46e477 | 2007-05-08 00:34:27 -0700 | [diff] [blame] | 201 | #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) |
Boqun Feng | 56c08e6 | 2015-12-15 22:24:17 +0800 | [diff] [blame] | 202 | #define atomic_cmpxchg_relaxed(v, o, n) \ |
| 203 | cmpxchg_relaxed(&((v)->counter), (o), (n)) |
| 204 | #define atomic_cmpxchg_acquire(v, o, n) \ |
| 205 | cmpxchg_acquire(&((v)->counter), (o), (n)) |
| 206 | |
Ingo Molnar | ffbf670 | 2006-01-09 15:59:17 -0800 | [diff] [blame] | 207 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
Boqun Feng | 26760fc | 2015-12-15 22:24:16 +0800 | [diff] [blame] | 208 | #define atomic_xchg_relaxed(v, new) xchg_relaxed(&((v)->counter), (new)) |
Nick Piggin | 4a6dae6 | 2005-11-13 16:07:24 -0800 | [diff] [blame] | 209 | |
Nick Piggin | 8426e1f | 2005-11-13 16:07:25 -0800 | [diff] [blame] | 210 | /** |
Mark Rutland | bfc18e3 | 2018-06-21 13:13:04 +0100 | [diff] [blame] | 211 | * atomic_fetch_add_unless - add unless the number is a given value |
Nick Piggin | 8426e1f | 2005-11-13 16:07:25 -0800 | [diff] [blame] | 212 | * @v: pointer of type atomic_t |
| 213 | * @a: the amount to add to v... |
| 214 | * @u: ...unless v is equal to u. |
| 215 | * |
| 216 | * Atomically adds @a to @v, so long as it was not @u. |
Arun Sharma | f24219b | 2011-07-26 16:09:07 -0700 | [diff] [blame] | 217 | * Returns the old value of @v. |
Nick Piggin | 8426e1f | 2005-11-13 16:07:25 -0800 | [diff] [blame] | 218 | */ |
Mark Rutland | bfc18e3 | 2018-06-21 13:13:04 +0100 | [diff] [blame] | 219 | static __inline__ int atomic_fetch_add_unless(atomic_t *v, int a, int u) |
Nick Piggin | f055aff | 2006-02-20 10:41:40 +0100 | [diff] [blame] | 220 | { |
| 221 | int t; |
| 222 | |
| 223 | __asm__ __volatile__ ( |
Benjamin Herrenschmidt | b97021f | 2011-11-15 17:11:27 +0000 | [diff] [blame] | 224 | PPC_ATOMIC_ENTRY_BARRIER |
Mark Rutland | bfc18e3 | 2018-06-21 13:13:04 +0100 | [diff] [blame] | 225 | "1: lwarx %0,0,%1 # atomic_fetch_add_unless\n\ |
Nick Piggin | f055aff | 2006-02-20 10:41:40 +0100 | [diff] [blame] | 226 | cmpw 0,%0,%3 \n\ |
Anton Blanchard | 61e98eb | 2016-10-03 17:03:03 +1100 | [diff] [blame] | 227 | beq 2f \n\ |
Nick Piggin | f055aff | 2006-02-20 10:41:40 +0100 | [diff] [blame] | 228 | add %0,%2,%0 \n" |
| 229 | PPC405_ERR77(0,%2) |
| 230 | " stwcx. %0,0,%1 \n\ |
| 231 | bne- 1b \n" |
Benjamin Herrenschmidt | b97021f | 2011-11-15 17:11:27 +0000 | [diff] [blame] | 232 | PPC_ATOMIC_EXIT_BARRIER |
Nick Piggin | f055aff | 2006-02-20 10:41:40 +0100 | [diff] [blame] | 233 | " subf %0,%2,%0 \n\ |
| 234 | 2:" |
| 235 | : "=&r" (t) |
| 236 | : "r" (&v->counter), "r" (a), "r" (u) |
| 237 | : "cc", "memory"); |
| 238 | |
Arun Sharma | f24219b | 2011-07-26 16:09:07 -0700 | [diff] [blame] | 239 | return t; |
Nick Piggin | f055aff | 2006-02-20 10:41:40 +0100 | [diff] [blame] | 240 | } |
Mark Rutland | eccc2da | 2018-06-21 13:13:09 +0100 | [diff] [blame] | 241 | #define atomic_fetch_add_unless atomic_fetch_add_unless |
Nick Piggin | f055aff | 2006-02-20 10:41:40 +0100 | [diff] [blame] | 242 | |
Anton Blanchard | a6cf7ed | 2012-02-29 21:12:16 +0000 | [diff] [blame] | 243 | /** |
| 244 | * atomic_inc_not_zero - increment unless the number is zero |
| 245 | * @v: pointer of type atomic_t |
| 246 | * |
| 247 | * Atomically increments @v by 1, so long as @v is non-zero. |
| 248 | * Returns non-zero if @v was non-zero, and zero otherwise. |
| 249 | */ |
| 250 | static __inline__ int atomic_inc_not_zero(atomic_t *v) |
| 251 | { |
| 252 | int t1, t2; |
| 253 | |
| 254 | __asm__ __volatile__ ( |
| 255 | PPC_ATOMIC_ENTRY_BARRIER |
| 256 | "1: lwarx %0,0,%2 # atomic_inc_not_zero\n\ |
| 257 | cmpwi 0,%0,0\n\ |
| 258 | beq- 2f\n\ |
| 259 | addic %1,%0,1\n" |
| 260 | PPC405_ERR77(0,%2) |
| 261 | " stwcx. %1,0,%2\n\ |
| 262 | bne- 1b\n" |
| 263 | PPC_ATOMIC_EXIT_BARRIER |
| 264 | "\n\ |
| 265 | 2:" |
| 266 | : "=&r" (t1), "=&r" (t2) |
| 267 | : "r" (&v->counter) |
| 268 | : "cc", "xer", "memory"); |
| 269 | |
| 270 | return t1; |
| 271 | } |
| 272 | #define atomic_inc_not_zero(v) atomic_inc_not_zero((v)) |
Nick Piggin | 8426e1f | 2005-11-13 16:07:25 -0800 | [diff] [blame] | 273 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | /* |
| 275 | * Atomically test *v and decrement if it is greater than 0. |
Robert Jennings | 434f98c | 2007-01-17 10:50:20 -0600 | [diff] [blame] | 276 | * The function returns the old value of *v minus 1, even if |
| 277 | * the atomic variable, v, was not decremented. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | */ |
| 279 | static __inline__ int atomic_dec_if_positive(atomic_t *v) |
| 280 | { |
| 281 | int t; |
| 282 | |
| 283 | __asm__ __volatile__( |
Benjamin Herrenschmidt | b97021f | 2011-11-15 17:11:27 +0000 | [diff] [blame] | 284 | PPC_ATOMIC_ENTRY_BARRIER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | "1: lwarx %0,0,%1 # atomic_dec_if_positive\n\ |
Robert Jennings | 434f98c | 2007-01-17 10:50:20 -0600 | [diff] [blame] | 286 | cmpwi %0,1\n\ |
| 287 | addi %0,%0,-1\n\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | blt- 2f\n" |
| 289 | PPC405_ERR77(0,%1) |
| 290 | " stwcx. %0,0,%1\n\ |
| 291 | bne- 1b" |
Benjamin Herrenschmidt | b97021f | 2011-11-15 17:11:27 +0000 | [diff] [blame] | 292 | PPC_ATOMIC_EXIT_BARRIER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | "\n\ |
Robert Jennings | 434f98c | 2007-01-17 10:50:20 -0600 | [diff] [blame] | 294 | 2:" : "=&b" (t) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | : "r" (&v->counter) |
| 296 | : "cc", "memory"); |
| 297 | |
| 298 | return t; |
| 299 | } |
Shaohua Li | e79bee2 | 2012-10-08 16:32:18 -0700 | [diff] [blame] | 300 | #define atomic_dec_if_positive atomic_dec_if_positive |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 302 | #ifdef __powerpc64__ |
| 303 | |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 304 | #define ATOMIC64_INIT(i) { (i) } |
| 305 | |
Segher Boessenkool | 9f0cbea | 2007-08-11 10:15:30 +1000 | [diff] [blame] | 306 | static __inline__ long atomic64_read(const atomic64_t *v) |
| 307 | { |
| 308 | long t; |
| 309 | |
| 310 | __asm__ __volatile__("ld%U1%X1 %0,%1" : "=r"(t) : "m"(v->counter)); |
| 311 | |
| 312 | return t; |
| 313 | } |
| 314 | |
| 315 | static __inline__ void atomic64_set(atomic64_t *v, long i) |
| 316 | { |
| 317 | __asm__ __volatile__("std%U0%X0 %1,%0" : "=m"(v->counter) : "r"(i)); |
| 318 | } |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 319 | |
Peter Zijlstra | af095dd | 2014-03-26 18:11:31 +0100 | [diff] [blame] | 320 | #define ATOMIC64_OP(op, asm_op) \ |
| 321 | static __inline__ void atomic64_##op(long a, atomic64_t *v) \ |
| 322 | { \ |
| 323 | long t; \ |
| 324 | \ |
| 325 | __asm__ __volatile__( \ |
| 326 | "1: ldarx %0,0,%3 # atomic64_" #op "\n" \ |
| 327 | #asm_op " %0,%2,%0\n" \ |
| 328 | " stdcx. %0,0,%3 \n" \ |
| 329 | " bne- 1b\n" \ |
| 330 | : "=&r" (t), "+m" (v->counter) \ |
| 331 | : "r" (a), "r" (&v->counter) \ |
| 332 | : "cc"); \ |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 333 | } |
| 334 | |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 335 | #define ATOMIC64_OP_RETURN_RELAXED(op, asm_op) \ |
| 336 | static inline long \ |
| 337 | atomic64_##op##_return_relaxed(long a, atomic64_t *v) \ |
Peter Zijlstra | af095dd | 2014-03-26 18:11:31 +0100 | [diff] [blame] | 338 | { \ |
| 339 | long t; \ |
| 340 | \ |
| 341 | __asm__ __volatile__( \ |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 342 | "1: ldarx %0,0,%3 # atomic64_" #op "_return_relaxed\n" \ |
| 343 | #asm_op " %0,%2,%0\n" \ |
| 344 | " stdcx. %0,0,%3\n" \ |
Peter Zijlstra | af095dd | 2014-03-26 18:11:31 +0100 | [diff] [blame] | 345 | " bne- 1b\n" \ |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 346 | : "=&r" (t), "+m" (v->counter) \ |
Peter Zijlstra | af095dd | 2014-03-26 18:11:31 +0100 | [diff] [blame] | 347 | : "r" (a), "r" (&v->counter) \ |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 348 | : "cc"); \ |
Peter Zijlstra | af095dd | 2014-03-26 18:11:31 +0100 | [diff] [blame] | 349 | \ |
| 350 | return t; \ |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 351 | } |
| 352 | |
Peter Zijlstra | a28cc7b | 2016-04-18 01:16:05 +0200 | [diff] [blame] | 353 | #define ATOMIC64_FETCH_OP_RELAXED(op, asm_op) \ |
| 354 | static inline long \ |
| 355 | atomic64_fetch_##op##_relaxed(long a, atomic64_t *v) \ |
| 356 | { \ |
| 357 | long res, t; \ |
| 358 | \ |
| 359 | __asm__ __volatile__( \ |
| 360 | "1: ldarx %0,0,%4 # atomic64_fetch_" #op "_relaxed\n" \ |
| 361 | #asm_op " %1,%3,%0\n" \ |
| 362 | " stdcx. %1,0,%4\n" \ |
| 363 | " bne- 1b\n" \ |
| 364 | : "=&r" (res), "=&r" (t), "+m" (v->counter) \ |
| 365 | : "r" (a), "r" (&v->counter) \ |
| 366 | : "cc"); \ |
| 367 | \ |
| 368 | return res; \ |
| 369 | } |
| 370 | |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 371 | #define ATOMIC64_OPS(op, asm_op) \ |
| 372 | ATOMIC64_OP(op, asm_op) \ |
Peter Zijlstra | a28cc7b | 2016-04-18 01:16:05 +0200 | [diff] [blame] | 373 | ATOMIC64_OP_RETURN_RELAXED(op, asm_op) \ |
| 374 | ATOMIC64_FETCH_OP_RELAXED(op, asm_op) |
Peter Zijlstra | af095dd | 2014-03-26 18:11:31 +0100 | [diff] [blame] | 375 | |
| 376 | ATOMIC64_OPS(add, add) |
| 377 | ATOMIC64_OPS(sub, subf) |
| 378 | |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 379 | #define atomic64_add_return_relaxed atomic64_add_return_relaxed |
| 380 | #define atomic64_sub_return_relaxed atomic64_sub_return_relaxed |
| 381 | |
Peter Zijlstra | a28cc7b | 2016-04-18 01:16:05 +0200 | [diff] [blame] | 382 | #define atomic64_fetch_add_relaxed atomic64_fetch_add_relaxed |
| 383 | #define atomic64_fetch_sub_relaxed atomic64_fetch_sub_relaxed |
| 384 | |
| 385 | #undef ATOMIC64_OPS |
| 386 | #define ATOMIC64_OPS(op, asm_op) \ |
| 387 | ATOMIC64_OP(op, asm_op) \ |
| 388 | ATOMIC64_FETCH_OP_RELAXED(op, asm_op) |
| 389 | |
| 390 | ATOMIC64_OPS(and, and) |
| 391 | ATOMIC64_OPS(or, or) |
| 392 | ATOMIC64_OPS(xor, xor) |
| 393 | |
| 394 | #define atomic64_fetch_and_relaxed atomic64_fetch_and_relaxed |
| 395 | #define atomic64_fetch_or_relaxed atomic64_fetch_or_relaxed |
| 396 | #define atomic64_fetch_xor_relaxed atomic64_fetch_xor_relaxed |
| 397 | |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 398 | #undef ATOPIC64_OPS |
Peter Zijlstra | a28cc7b | 2016-04-18 01:16:05 +0200 | [diff] [blame] | 399 | #undef ATOMIC64_FETCH_OP_RELAXED |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 400 | #undef ATOMIC64_OP_RETURN_RELAXED |
Peter Zijlstra | af095dd | 2014-03-26 18:11:31 +0100 | [diff] [blame] | 401 | #undef ATOMIC64_OP |
| 402 | |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 403 | static __inline__ void atomic64_inc(atomic64_t *v) |
| 404 | { |
| 405 | long t; |
| 406 | |
| 407 | __asm__ __volatile__( |
| 408 | "1: ldarx %0,0,%2 # atomic64_inc\n\ |
| 409 | addic %0,%0,1\n\ |
| 410 | stdcx. %0,0,%2 \n\ |
| 411 | bne- 1b" |
Linus Torvalds | e2a3d40 | 2006-07-08 15:00:28 -0700 | [diff] [blame] | 412 | : "=&r" (t), "+m" (v->counter) |
| 413 | : "r" (&v->counter) |
Paul Mackerras | efc3624 | 2008-11-05 18:39:27 +0000 | [diff] [blame] | 414 | : "cc", "xer"); |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 415 | } |
Mark Rutland | 9837559 | 2018-06-21 13:13:19 +0100 | [diff] [blame] | 416 | #define atomic64_inc atomic64_inc |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 417 | |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 418 | static __inline__ long atomic64_inc_return_relaxed(atomic64_t *v) |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 419 | { |
| 420 | long t; |
| 421 | |
| 422 | __asm__ __volatile__( |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 423 | "1: ldarx %0,0,%2 # atomic64_inc_return_relaxed\n" |
| 424 | " addic %0,%0,1\n" |
| 425 | " stdcx. %0,0,%2\n" |
| 426 | " bne- 1b" |
| 427 | : "=&r" (t), "+m" (v->counter) |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 428 | : "r" (&v->counter) |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 429 | : "cc", "xer"); |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 430 | |
| 431 | return t; |
| 432 | } |
| 433 | |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 434 | static __inline__ void atomic64_dec(atomic64_t *v) |
| 435 | { |
| 436 | long t; |
| 437 | |
| 438 | __asm__ __volatile__( |
| 439 | "1: ldarx %0,0,%2 # atomic64_dec\n\ |
| 440 | addic %0,%0,-1\n\ |
| 441 | stdcx. %0,0,%2\n\ |
| 442 | bne- 1b" |
Linus Torvalds | e2a3d40 | 2006-07-08 15:00:28 -0700 | [diff] [blame] | 443 | : "=&r" (t), "+m" (v->counter) |
| 444 | : "r" (&v->counter) |
Paul Mackerras | efc3624 | 2008-11-05 18:39:27 +0000 | [diff] [blame] | 445 | : "cc", "xer"); |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 446 | } |
Mark Rutland | 9837559 | 2018-06-21 13:13:19 +0100 | [diff] [blame] | 447 | #define atomic64_dec atomic64_dec |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 448 | |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 449 | static __inline__ long atomic64_dec_return_relaxed(atomic64_t *v) |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 450 | { |
| 451 | long t; |
| 452 | |
| 453 | __asm__ __volatile__( |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 454 | "1: ldarx %0,0,%2 # atomic64_dec_return_relaxed\n" |
| 455 | " addic %0,%0,-1\n" |
| 456 | " stdcx. %0,0,%2\n" |
| 457 | " bne- 1b" |
| 458 | : "=&r" (t), "+m" (v->counter) |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 459 | : "r" (&v->counter) |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 460 | : "cc", "xer"); |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 461 | |
| 462 | return t; |
| 463 | } |
| 464 | |
Boqun Feng | dc53617 | 2016-01-06 10:08:25 +0800 | [diff] [blame] | 465 | #define atomic64_inc_return_relaxed atomic64_inc_return_relaxed |
| 466 | #define atomic64_dec_return_relaxed atomic64_dec_return_relaxed |
| 467 | |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 468 | /* |
| 469 | * Atomically test *v and decrement if it is greater than 0. |
| 470 | * The function returns the old value of *v minus 1. |
| 471 | */ |
| 472 | static __inline__ long atomic64_dec_if_positive(atomic64_t *v) |
| 473 | { |
| 474 | long t; |
| 475 | |
| 476 | __asm__ __volatile__( |
Benjamin Herrenschmidt | b97021f | 2011-11-15 17:11:27 +0000 | [diff] [blame] | 477 | PPC_ATOMIC_ENTRY_BARRIER |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 478 | "1: ldarx %0,0,%1 # atomic64_dec_if_positive\n\ |
| 479 | addic. %0,%0,-1\n\ |
| 480 | blt- 2f\n\ |
| 481 | stdcx. %0,0,%1\n\ |
| 482 | bne- 1b" |
Benjamin Herrenschmidt | b97021f | 2011-11-15 17:11:27 +0000 | [diff] [blame] | 483 | PPC_ATOMIC_EXIT_BARRIER |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 484 | "\n\ |
| 485 | 2:" : "=&r" (t) |
| 486 | : "r" (&v->counter) |
Paul Mackerras | efc3624 | 2008-11-05 18:39:27 +0000 | [diff] [blame] | 487 | : "cc", "xer", "memory"); |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 488 | |
| 489 | return t; |
| 490 | } |
Mark Rutland | b3a2a05 | 2018-06-21 13:13:20 +0100 | [diff] [blame^] | 491 | #define atomic64_dec_if_positive atomic64_dec_if_positive |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 492 | |
Mathieu Desnoyers | f46e477 | 2007-05-08 00:34:27 -0700 | [diff] [blame] | 493 | #define atomic64_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) |
Boqun Feng | 56c08e6 | 2015-12-15 22:24:17 +0800 | [diff] [blame] | 494 | #define atomic64_cmpxchg_relaxed(v, o, n) \ |
| 495 | cmpxchg_relaxed(&((v)->counter), (o), (n)) |
| 496 | #define atomic64_cmpxchg_acquire(v, o, n) \ |
| 497 | cmpxchg_acquire(&((v)->counter), (o), (n)) |
| 498 | |
Mathieu Desnoyers | 41806ef | 2007-01-25 11:15:52 -0500 | [diff] [blame] | 499 | #define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) |
Boqun Feng | 26760fc | 2015-12-15 22:24:16 +0800 | [diff] [blame] | 500 | #define atomic64_xchg_relaxed(v, new) xchg_relaxed(&((v)->counter), (new)) |
Mathieu Desnoyers | 41806ef | 2007-01-25 11:15:52 -0500 | [diff] [blame] | 501 | |
| 502 | /** |
Mark Rutland | 4f44b4b | 2018-06-21 13:13:15 +0100 | [diff] [blame] | 503 | * atomic64_fetch_add_unless - add unless the number is a given value |
Mathieu Desnoyers | 41806ef | 2007-01-25 11:15:52 -0500 | [diff] [blame] | 504 | * @v: pointer of type atomic64_t |
| 505 | * @a: the amount to add to v... |
| 506 | * @u: ...unless v is equal to u. |
| 507 | * |
| 508 | * Atomically adds @a to @v, so long as it was not @u. |
Arun Sharma | f24219b | 2011-07-26 16:09:07 -0700 | [diff] [blame] | 509 | * Returns the old value of @v. |
Mathieu Desnoyers | 41806ef | 2007-01-25 11:15:52 -0500 | [diff] [blame] | 510 | */ |
Mark Rutland | 4f44b4b | 2018-06-21 13:13:15 +0100 | [diff] [blame] | 511 | static __inline__ long atomic64_fetch_add_unless(atomic64_t *v, long a, long u) |
Mathieu Desnoyers | 41806ef | 2007-01-25 11:15:52 -0500 | [diff] [blame] | 512 | { |
| 513 | long t; |
| 514 | |
| 515 | __asm__ __volatile__ ( |
Benjamin Herrenschmidt | b97021f | 2011-11-15 17:11:27 +0000 | [diff] [blame] | 516 | PPC_ATOMIC_ENTRY_BARRIER |
Mark Rutland | 4f44b4b | 2018-06-21 13:13:15 +0100 | [diff] [blame] | 517 | "1: ldarx %0,0,%1 # atomic64_fetch_add_unless\n\ |
Mathieu Desnoyers | 41806ef | 2007-01-25 11:15:52 -0500 | [diff] [blame] | 518 | cmpd 0,%0,%3 \n\ |
Anton Blanchard | 61e98eb | 2016-10-03 17:03:03 +1100 | [diff] [blame] | 519 | beq 2f \n\ |
Mathieu Desnoyers | 41806ef | 2007-01-25 11:15:52 -0500 | [diff] [blame] | 520 | add %0,%2,%0 \n" |
| 521 | " stdcx. %0,0,%1 \n\ |
| 522 | bne- 1b \n" |
Benjamin Herrenschmidt | b97021f | 2011-11-15 17:11:27 +0000 | [diff] [blame] | 523 | PPC_ATOMIC_EXIT_BARRIER |
Mathieu Desnoyers | 41806ef | 2007-01-25 11:15:52 -0500 | [diff] [blame] | 524 | " subf %0,%2,%0 \n\ |
| 525 | 2:" |
| 526 | : "=&r" (t) |
| 527 | : "r" (&v->counter), "r" (a), "r" (u) |
| 528 | : "cc", "memory"); |
| 529 | |
Mark Rutland | 4f44b4b | 2018-06-21 13:13:15 +0100 | [diff] [blame] | 530 | return t; |
Mathieu Desnoyers | 41806ef | 2007-01-25 11:15:52 -0500 | [diff] [blame] | 531 | } |
Mark Rutland | 4f44b4b | 2018-06-21 13:13:15 +0100 | [diff] [blame] | 532 | #define atomic64_fetch_add_unless atomic64_fetch_add_unless |
Mathieu Desnoyers | 41806ef | 2007-01-25 11:15:52 -0500 | [diff] [blame] | 533 | |
Anton Blanchard | a6cf7ed | 2012-02-29 21:12:16 +0000 | [diff] [blame] | 534 | /** |
| 535 | * atomic_inc64_not_zero - increment unless the number is zero |
| 536 | * @v: pointer of type atomic64_t |
| 537 | * |
| 538 | * Atomically increments @v by 1, so long as @v is non-zero. |
| 539 | * Returns non-zero if @v was non-zero, and zero otherwise. |
| 540 | */ |
Michael Ellerman | 01e6a61 | 2017-07-11 22:10:54 +1000 | [diff] [blame] | 541 | static __inline__ int atomic64_inc_not_zero(atomic64_t *v) |
Anton Blanchard | a6cf7ed | 2012-02-29 21:12:16 +0000 | [diff] [blame] | 542 | { |
| 543 | long t1, t2; |
| 544 | |
| 545 | __asm__ __volatile__ ( |
| 546 | PPC_ATOMIC_ENTRY_BARRIER |
| 547 | "1: ldarx %0,0,%2 # atomic64_inc_not_zero\n\ |
| 548 | cmpdi 0,%0,0\n\ |
| 549 | beq- 2f\n\ |
| 550 | addic %1,%0,1\n\ |
| 551 | stdcx. %1,0,%2\n\ |
| 552 | bne- 1b\n" |
| 553 | PPC_ATOMIC_EXIT_BARRIER |
| 554 | "\n\ |
| 555 | 2:" |
| 556 | : "=&r" (t1), "=&r" (t2) |
| 557 | : "r" (&v->counter) |
| 558 | : "cc", "xer", "memory"); |
| 559 | |
Michael Ellerman | 01e6a61 | 2017-07-11 22:10:54 +1000 | [diff] [blame] | 560 | return t1 != 0; |
Anton Blanchard | a6cf7ed | 2012-02-29 21:12:16 +0000 | [diff] [blame] | 561 | } |
Mark Rutland | bef8282 | 2018-06-21 13:13:08 +0100 | [diff] [blame] | 562 | #define atomic64_inc_not_zero(v) atomic64_inc_not_zero((v)) |
Mathieu Desnoyers | 41806ef | 2007-01-25 11:15:52 -0500 | [diff] [blame] | 563 | |
Stephen Rothwell | 06a98db | 2005-11-10 15:51:14 +1100 | [diff] [blame] | 564 | #endif /* __powerpc64__ */ |
| 565 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | #endif /* __KERNEL__ */ |
Becky Bruce | feaf7cf | 2005-09-22 14:20:04 -0500 | [diff] [blame] | 567 | #endif /* _ASM_POWERPC_ATOMIC_H_ */ |