Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6936 | serge | 1 | /* |
| 2 | * Generic barrier definitions, originally based on MN10300 definitions. |
||
| 3 | * |
||
| 4 | * It should be possible to use these on really simple architectures, |
||
| 5 | * but it serves more as a starting point for new ports. |
||
| 6 | * |
||
| 7 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
||
| 8 | * Written by David Howells (dhowells@redhat.com) |
||
| 9 | * |
||
| 10 | * This program is free software; you can redistribute it and/or |
||
| 11 | * modify it under the terms of the GNU General Public Licence |
||
| 12 | * as published by the Free Software Foundation; either version |
||
| 13 | * 2 of the Licence, or (at your option) any later version. |
||
| 14 | */ |
||
| 15 | #ifndef __ASM_GENERIC_BARRIER_H |
||
| 16 | #define __ASM_GENERIC_BARRIER_H |
||
| 17 | |||
| 18 | #ifndef __ASSEMBLY__ |
||
| 19 | |||
| 20 | #include |
||
| 21 | |||
| 22 | #ifndef nop |
||
| 23 | #define nop() asm volatile ("nop") |
||
| 24 | #endif |
||
| 25 | |||
| 26 | /* |
||
| 27 | * Force strict CPU ordering. And yes, this is required on UP too when we're |
||
| 28 | * talking to devices. |
||
| 29 | * |
||
| 30 | * Fall back to compiler barriers if nothing better is provided. |
||
| 31 | */ |
||
| 32 | |||
| 33 | #ifndef mb |
||
| 34 | #define mb() barrier() |
||
| 35 | #endif |
||
| 36 | |||
| 37 | #ifndef rmb |
||
| 38 | #define rmb() mb() |
||
| 39 | #endif |
||
| 40 | |||
| 41 | #ifndef wmb |
||
| 42 | #define wmb() mb() |
||
| 43 | #endif |
||
| 44 | |||
| 45 | #ifndef dma_rmb |
||
| 46 | #define dma_rmb() rmb() |
||
| 47 | #endif |
||
| 48 | |||
| 49 | #ifndef dma_wmb |
||
| 50 | #define dma_wmb() wmb() |
||
| 51 | #endif |
||
| 52 | |||
| 53 | #ifndef read_barrier_depends |
||
| 54 | #define read_barrier_depends() do { } while (0) |
||
| 55 | #endif |
||
| 56 | |||
| 57 | #ifndef __smp_mb |
||
| 58 | #define __smp_mb() mb() |
||
| 59 | #endif |
||
| 60 | |||
| 61 | #ifndef __smp_rmb |
||
| 62 | #define __smp_rmb() rmb() |
||
| 63 | #endif |
||
| 64 | |||
| 65 | #ifndef __smp_wmb |
||
| 66 | #define __smp_wmb() wmb() |
||
| 67 | #endif |
||
| 68 | |||
| 69 | #ifndef __smp_read_barrier_depends |
||
| 70 | #define __smp_read_barrier_depends() read_barrier_depends() |
||
| 71 | #endif |
||
| 72 | |||
| 73 | #ifdef CONFIG_SMP |
||
| 74 | |||
| 75 | #ifndef smp_mb |
||
| 76 | #define smp_mb() __smp_mb() |
||
| 77 | #endif |
||
| 78 | |||
| 79 | #ifndef smp_rmb |
||
| 80 | #define smp_rmb() __smp_rmb() |
||
| 81 | #endif |
||
| 82 | |||
| 83 | #ifndef smp_wmb |
||
| 84 | #define smp_wmb() __smp_wmb() |
||
| 85 | #endif |
||
| 86 | |||
| 87 | #ifndef smp_read_barrier_depends |
||
| 88 | #define smp_read_barrier_depends() __smp_read_barrier_depends() |
||
| 89 | #endif |
||
| 90 | |||
| 91 | #else /* !CONFIG_SMP */ |
||
| 92 | |||
| 93 | #ifndef smp_mb |
||
| 94 | #define smp_mb() barrier() |
||
| 95 | #endif |
||
| 96 | |||
| 97 | #ifndef smp_rmb |
||
| 98 | #define smp_rmb() barrier() |
||
| 99 | #endif |
||
| 100 | |||
| 101 | #ifndef smp_wmb |
||
| 102 | #define smp_wmb() barrier() |
||
| 103 | #endif |
||
| 104 | |||
| 105 | #ifndef smp_read_barrier_depends |
||
| 106 | #define smp_read_barrier_depends() do { } while (0) |
||
| 107 | #endif |
||
| 108 | |||
| 109 | #endif /* CONFIG_SMP */ |
||
| 110 | |||
| 111 | #ifndef __smp_store_mb |
||
| 112 | #define __smp_store_mb(var, value) do { WRITE_ONCE(var, value); __smp_mb(); } while (0) |
||
| 113 | #endif |
||
| 114 | |||
| 115 | #ifndef __smp_mb__before_atomic |
||
| 116 | #define __smp_mb__before_atomic() __smp_mb() |
||
| 117 | #endif |
||
| 118 | |||
| 119 | #ifndef __smp_mb__after_atomic |
||
| 120 | #define __smp_mb__after_atomic() __smp_mb() |
||
| 121 | #endif |
||
| 122 | |||
| 123 | #ifndef __smp_store_release |
||
| 124 | #define __smp_store_release(p, v) \ |
||
| 125 | do { \ |
||
| 126 | compiletime_assert_atomic_type(*p); \ |
||
| 127 | __smp_mb(); \ |
||
| 128 | WRITE_ONCE(*p, v); \ |
||
| 129 | } while (0) |
||
| 130 | #endif |
||
| 131 | |||
| 132 | #ifndef __smp_load_acquire |
||
| 133 | #define __smp_load_acquire(p) \ |
||
| 134 | ({ \ |
||
| 135 | typeof(*p) ___p1 = READ_ONCE(*p); \ |
||
| 136 | compiletime_assert_atomic_type(*p); \ |
||
| 137 | __smp_mb(); \ |
||
| 138 | ___p1; \ |
||
| 139 | }) |
||
| 140 | #endif |
||
| 141 | |||
| 142 | #ifdef CONFIG_SMP |
||
| 143 | |||
| 144 | #ifndef smp_store_mb |
||
| 145 | #define smp_store_mb(var, value) __smp_store_mb(var, value) |
||
| 146 | #endif |
||
| 147 | |||
| 148 | #ifndef smp_mb__before_atomic |
||
| 149 | #define smp_mb__before_atomic() __smp_mb__before_atomic() |
||
| 150 | #endif |
||
| 151 | |||
| 152 | #ifndef smp_mb__after_atomic |
||
| 153 | #define smp_mb__after_atomic() __smp_mb__after_atomic() |
||
| 154 | #endif |
||
| 155 | |||
| 156 | #ifndef smp_store_release |
||
| 157 | #define smp_store_release(p, v) __smp_store_release(p, v) |
||
| 158 | #endif |
||
| 159 | |||
| 160 | #ifndef smp_load_acquire |
||
| 161 | #define smp_load_acquire(p) __smp_load_acquire(p) |
||
| 162 | #endif |
||
| 163 | |||
| 164 | #else /* !CONFIG_SMP */ |
||
| 165 | |||
| 166 | #ifndef smp_store_mb |
||
| 167 | #define smp_store_mb(var, value) do { WRITE_ONCE(var, value); barrier(); } while (0) |
||
| 168 | #endif |
||
| 169 | |||
| 170 | #ifndef smp_mb__before_atomic |
||
| 171 | #define smp_mb__before_atomic() barrier() |
||
| 172 | #endif |
||
| 173 | |||
| 174 | #ifndef smp_mb__after_atomic |
||
| 175 | #define smp_mb__after_atomic() barrier() |
||
| 176 | #endif |
||
| 177 | |||
| 178 | #ifndef smp_store_release |
||
| 179 | #define smp_store_release(p, v) \ |
||
| 180 | do { \ |
||
| 181 | compiletime_assert_atomic_type(*p); \ |
||
| 182 | barrier(); \ |
||
| 183 | WRITE_ONCE(*p, v); \ |
||
| 184 | } while (0) |
||
| 185 | #endif |
||
| 186 | |||
| 187 | #ifndef smp_load_acquire |
||
| 188 | #define smp_load_acquire(p) \ |
||
| 189 | ({ \ |
||
| 190 | typeof(*p) ___p1 = READ_ONCE(*p); \ |
||
| 191 | compiletime_assert_atomic_type(*p); \ |
||
| 192 | barrier(); \ |
||
| 193 | ___p1; \ |
||
| 194 | }) |
||
| 195 | #endif |
||
| 196 | |||
| 197 | #endif |
||
| 198 | |||
| 199 | /* Barriers for virtual machine guests when talking to an SMP host */ |
||
| 200 | #define virt_mb() __smp_mb() |
||
| 201 | #define virt_rmb() __smp_rmb() |
||
| 202 | #define virt_wmb() __smp_wmb() |
||
| 203 | #define virt_read_barrier_depends() __smp_read_barrier_depends() |
||
| 204 | #define virt_store_mb(var, value) __smp_store_mb(var, value) |
||
| 205 | #define virt_mb__before_atomic() __smp_mb__before_atomic() |
||
| 206 | #define virt_mb__after_atomic() __smp_mb__after_atomic() |
||
| 207 | #define virt_store_release(p, v) __smp_store_release(p, v) |
||
| 208 | #define virt_load_acquire(p) __smp_load_acquire(p) |
||
| 209 | |||
| 210 | #endif /* !__ASSEMBLY__ */ |
||
| 211 | #endif /* __ASM_GENERIC_BARRIER_H */ |