Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
Mathieu Desnoyers | 6d8944a | 2007-05-08 00:34:53 -0700 | [diff] [blame] | 2 | #ifndef _ARCH_POWERPC_LOCAL_H |
| 3 | #define _ARCH_POWERPC_LOCAL_H |
| 4 | |
Madhavan Srinivasan | 6cd74d2 | 2017-12-20 09:25:57 +0530 | [diff] [blame] | 5 | #ifdef CONFIG_PPC_BOOK3S_64 |
| 6 | |
| 7 | #include <linux/percpu.h> |
| 8 | #include <linux/atomic.h> |
| 9 | #include <linux/irqflags.h> |
| 10 | |
| 11 | #include <asm/hw_irq.h> |
| 12 | |
| 13 | typedef struct |
| 14 | { |
| 15 | long v; |
| 16 | } local_t; |
| 17 | |
| 18 | #define LOCAL_INIT(i) { (i) } |
| 19 | |
| 20 | static __inline__ long local_read(local_t *l) |
| 21 | { |
| 22 | return READ_ONCE(l->v); |
| 23 | } |
| 24 | |
| 25 | static __inline__ void local_set(local_t *l, long i) |
| 26 | { |
| 27 | WRITE_ONCE(l->v, i); |
| 28 | } |
| 29 | |
| 30 | #define LOCAL_OP(op, c_op) \ |
| 31 | static __inline__ void local_##op(long i, local_t *l) \ |
| 32 | { \ |
| 33 | unsigned long flags; \ |
| 34 | \ |
| 35 | powerpc_local_irq_pmu_save(flags); \ |
| 36 | l->v c_op i; \ |
| 37 | powerpc_local_irq_pmu_restore(flags); \ |
| 38 | } |
| 39 | |
| 40 | #define LOCAL_OP_RETURN(op, c_op) \ |
| 41 | static __inline__ long local_##op##_return(long a, local_t *l) \ |
| 42 | { \ |
| 43 | long t; \ |
| 44 | unsigned long flags; \ |
| 45 | \ |
| 46 | powerpc_local_irq_pmu_save(flags); \ |
| 47 | t = (l->v c_op a); \ |
| 48 | powerpc_local_irq_pmu_restore(flags); \ |
| 49 | \ |
| 50 | return t; \ |
| 51 | } |
| 52 | |
| 53 | #define LOCAL_OPS(op, c_op) \ |
| 54 | LOCAL_OP(op, c_op) \ |
| 55 | LOCAL_OP_RETURN(op, c_op) |
| 56 | |
| 57 | LOCAL_OPS(add, +=) |
| 58 | LOCAL_OPS(sub, -=) |
| 59 | |
| 60 | #define local_add_negative(a, l) (local_add_return((a), (l)) < 0) |
| 61 | #define local_inc_return(l) local_add_return(1LL, l) |
| 62 | #define local_inc(l) local_inc_return(l) |
| 63 | |
| 64 | /* |
| 65 | * local_inc_and_test - increment and test |
| 66 | * @l: pointer of type local_t |
| 67 | * |
| 68 | * Atomically increments @l by 1 |
| 69 | * and returns true if the result is zero, or false for all |
| 70 | * other cases. |
| 71 | */ |
| 72 | #define local_inc_and_test(l) (local_inc_return(l) == 0) |
| 73 | |
| 74 | #define local_dec_return(l) local_sub_return(1LL, l) |
| 75 | #define local_dec(l) local_dec_return(l) |
| 76 | #define local_sub_and_test(a, l) (local_sub_return((a), (l)) == 0) |
| 77 | #define local_dec_and_test(l) (local_dec_return((l)) == 0) |
| 78 | |
| 79 | static __inline__ long local_cmpxchg(local_t *l, long o, long n) |
| 80 | { |
| 81 | long t; |
| 82 | unsigned long flags; |
| 83 | |
| 84 | powerpc_local_irq_pmu_save(flags); |
| 85 | t = l->v; |
| 86 | if (t == o) |
| 87 | l->v = n; |
| 88 | powerpc_local_irq_pmu_restore(flags); |
| 89 | |
| 90 | return t; |
| 91 | } |
| 92 | |
| 93 | static __inline__ long local_xchg(local_t *l, long n) |
| 94 | { |
| 95 | long t; |
| 96 | unsigned long flags; |
| 97 | |
| 98 | powerpc_local_irq_pmu_save(flags); |
| 99 | t = l->v; |
| 100 | l->v = n; |
| 101 | powerpc_local_irq_pmu_restore(flags); |
| 102 | |
| 103 | return t; |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * local_add_unless - add unless the number is a given value |
| 108 | * @l: pointer of type local_t |
| 109 | * @a: the amount to add to v... |
| 110 | * @u: ...unless v is equal to u. |
| 111 | * |
| 112 | * Atomically adds @a to @l, so long as it was not @u. |
| 113 | * Returns non-zero if @l was not @u, and zero otherwise. |
| 114 | */ |
| 115 | static __inline__ int local_add_unless(local_t *l, long a, long u) |
| 116 | { |
| 117 | unsigned long flags; |
| 118 | int ret = 0; |
| 119 | |
| 120 | powerpc_local_irq_pmu_save(flags); |
| 121 | if (l->v != u) { |
| 122 | l->v += a; |
| 123 | ret = 1; |
| 124 | } |
| 125 | powerpc_local_irq_pmu_restore(flags); |
| 126 | |
| 127 | return ret; |
| 128 | } |
| 129 | |
| 130 | #define local_inc_not_zero(l) local_add_unless((l), 1, 0) |
| 131 | |
| 132 | /* Use these for per-cpu local_t variables: on some archs they are |
| 133 | * much more efficient than these naive implementations. Note they take |
| 134 | * a variable, not an address. |
| 135 | */ |
| 136 | |
| 137 | #define __local_inc(l) ((l)->v++) |
| 138 | #define __local_dec(l) ((l)->v++) |
| 139 | #define __local_add(i,l) ((l)->v+=(i)) |
| 140 | #define __local_sub(i,l) ((l)->v-=(i)) |
| 141 | |
| 142 | #else /* CONFIG_PPC64 */ |
| 143 | |
Madhavan Srinivasan | 3b7e302 | 2017-12-20 09:25:56 +0530 | [diff] [blame] | 144 | #include <asm-generic/local.h> |
Mathieu Desnoyers | 6d8944a | 2007-05-08 00:34:53 -0700 | [diff] [blame] | 145 | |
Madhavan Srinivasan | 6cd74d2 | 2017-12-20 09:25:57 +0530 | [diff] [blame] | 146 | #endif /* CONFIG_PPC64 */ |
| 147 | |
Mathieu Desnoyers | 6d8944a | 2007-05-08 00:34:53 -0700 | [diff] [blame] | 148 | #endif /* _ARCH_POWERPC_LOCAL_H */ |