Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 1 | /* atomic.h: Thankfully the V9 is at least reasonable for this |
| 2 | * stuff. |
| 3 | * |
David S. Miller | 193d2aa | 2012-11-09 19:37:59 -0800 | [diff] [blame] | 4 | * Copyright (C) 1996, 1997, 2000, 2012 David S. Miller (davem@redhat.com) |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 5 | */ |
| 6 | |
| 7 | #ifndef __ARCH_SPARC64_ATOMIC__ |
| 8 | #define __ARCH_SPARC64_ATOMIC__ |
| 9 | |
| 10 | #include <linux/types.h> |
David Howells | d550bbd | 2012-03-28 18:30:03 +0100 | [diff] [blame] | 11 | #include <asm/cmpxchg.h> |
Peter Zijlstra | 56d3648 | 2014-03-13 19:00:35 +0100 | [diff] [blame] | 12 | #include <asm/barrier.h> |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 13 | |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 14 | #define ATOMIC_INIT(i) { (i) } |
| 15 | #define ATOMIC64_INIT(i) { (i) } |
| 16 | |
Anton Blanchard | f3d46f9 | 2010-05-17 14:33:53 +1000 | [diff] [blame] | 17 | #define atomic_read(v) (*(volatile int *)&(v)->counter) |
| 18 | #define atomic64_read(v) (*(volatile long *)&(v)->counter) |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 19 | |
| 20 | #define atomic_set(v, i) (((v)->counter) = i) |
| 21 | #define atomic64_set(v, i) (((v)->counter) = i) |
| 22 | |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame^] | 23 | #define ATOMIC_OP(op) \ |
| 24 | void atomic_##op(int, atomic_t *); \ |
| 25 | void atomic64_##op(long, atomic64_t *); |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 26 | |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame^] | 27 | #define ATOMIC_OP_RETURN(op) \ |
| 28 | int atomic_##op##_return(int, atomic_t *); \ |
| 29 | long atomic64_##op##_return(long, atomic64_t *); |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 30 | |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame^] | 31 | #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 32 | |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame^] | 33 | ATOMIC_OPS(add) |
| 34 | ATOMIC_OPS(sub) |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 35 | |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame^] | 36 | #undef ATOMIC_OPS |
| 37 | #undef ATOMIC_OP_RETURN |
| 38 | #undef ATOMIC_OP |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 39 | |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame^] | 40 | #define atomic_dec_return(v) atomic_sub_return(1, v) |
| 41 | #define atomic64_dec_return(v) atomic64_sub_return(1, v) |
| 42 | |
| 43 | #define atomic_inc_return(v) atomic_add_return(1, v) |
| 44 | #define atomic64_inc_return(v) atomic64_add_return(1, v) |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 45 | |
| 46 | /* |
| 47 | * atomic_inc_and_test - increment and test |
| 48 | * @v: pointer of type atomic_t |
| 49 | * |
| 50 | * Atomically increments @v by 1 |
| 51 | * and returns true if the result is zero, or false for all |
| 52 | * other cases. |
| 53 | */ |
| 54 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) |
| 55 | #define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0) |
| 56 | |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame^] | 57 | #define atomic_sub_and_test(i, v) (atomic_sub_return(i, v) == 0) |
| 58 | #define atomic64_sub_and_test(i, v) (atomic64_sub_return(i, v) == 0) |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 59 | |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame^] | 60 | #define atomic_dec_and_test(v) (atomic_sub_return(1, v) == 0) |
| 61 | #define atomic64_dec_and_test(v) (atomic64_sub_return(1, v) == 0) |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 62 | |
| 63 | #define atomic_inc(v) atomic_add(1, v) |
| 64 | #define atomic64_inc(v) atomic64_add(1, v) |
| 65 | |
| 66 | #define atomic_dec(v) atomic_sub(1, v) |
| 67 | #define atomic64_dec(v) atomic64_sub(1, v) |
| 68 | |
Peter Zijlstra | 4f3316c | 2014-03-26 18:29:28 +0100 | [diff] [blame^] | 69 | #define atomic_add_negative(i, v) (atomic_add_return(i, v) < 0) |
| 70 | #define atomic64_add_negative(i, v) (atomic64_add_return(i, v) < 0) |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 71 | |
| 72 | #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) |
| 73 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
| 74 | |
Arun Sharma | f24219b | 2011-07-26 16:09:07 -0700 | [diff] [blame] | 75 | static inline int __atomic_add_unless(atomic_t *v, int a, int u) |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 76 | { |
| 77 | int c, old; |
| 78 | c = atomic_read(v); |
| 79 | for (;;) { |
| 80 | if (unlikely(c == (u))) |
| 81 | break; |
| 82 | old = atomic_cmpxchg((v), c, c + (a)); |
| 83 | if (likely(old == c)) |
| 84 | break; |
| 85 | c = old; |
| 86 | } |
Arun Sharma | f24219b | 2011-07-26 16:09:07 -0700 | [diff] [blame] | 87 | return c; |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 88 | } |
| 89 | |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 90 | #define atomic64_cmpxchg(v, o, n) \ |
| 91 | ((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n))) |
| 92 | #define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) |
| 93 | |
David S. Miller | 86fa04b | 2010-08-17 17:12:04 -0700 | [diff] [blame] | 94 | static inline long atomic64_add_unless(atomic64_t *v, long a, long u) |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 95 | { |
| 96 | long c, old; |
| 97 | c = atomic64_read(v); |
| 98 | for (;;) { |
| 99 | if (unlikely(c == (u))) |
| 100 | break; |
| 101 | old = atomic64_cmpxchg((v), c, c + (a)); |
| 102 | if (likely(old == c)) |
| 103 | break; |
| 104 | c = old; |
| 105 | } |
| 106 | return c != (u); |
| 107 | } |
| 108 | |
| 109 | #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) |
| 110 | |
Sam Ravnborg | f05a686 | 2014-05-16 23:25:50 +0200 | [diff] [blame] | 111 | long atomic64_dec_if_positive(atomic64_t *v); |
David S. Miller | 193d2aa | 2012-11-09 19:37:59 -0800 | [diff] [blame] | 112 | |
Sam Ravnborg | f5e706a | 2008-07-17 21:55:51 -0700 | [diff] [blame] | 113 | #endif /* !(__ARCH_SPARC64_ATOMIC__) */ |