1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ARCH_POWERPC_LOCAL_H 3 #define _ARCH_POWERPC_LOCAL_H 4 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(const 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 */ 143 144 #include <asm-generic/local.h> 145 146 #endif /* CONFIG_PPC64 */ 147 148 #endif /* _ARCH_POWERPC_LOCAL_H */ 149