1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef _ARCH_POWERPC_LOCAL_H
3*4882a593Smuzhiyun #define _ARCH_POWERPC_LOCAL_H
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #ifdef CONFIG_PPC_BOOK3S_64
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <linux/percpu.h>
8*4882a593Smuzhiyun #include <linux/atomic.h>
9*4882a593Smuzhiyun #include <linux/irqflags.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun #include <asm/hw_irq.h>
12*4882a593Smuzhiyun
13*4882a593Smuzhiyun typedef struct
14*4882a593Smuzhiyun {
15*4882a593Smuzhiyun long v;
16*4882a593Smuzhiyun } local_t;
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #define LOCAL_INIT(i) { (i) }
19*4882a593Smuzhiyun
local_read(const local_t * l)20*4882a593Smuzhiyun static __inline__ long local_read(const local_t *l)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun return READ_ONCE(l->v);
23*4882a593Smuzhiyun }
24*4882a593Smuzhiyun
local_set(local_t * l,long i)25*4882a593Smuzhiyun static __inline__ void local_set(local_t *l, long i)
26*4882a593Smuzhiyun {
27*4882a593Smuzhiyun WRITE_ONCE(l->v, i);
28*4882a593Smuzhiyun }
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun #define LOCAL_OP(op, c_op) \
31*4882a593Smuzhiyun static __inline__ void local_##op(long i, local_t *l) \
32*4882a593Smuzhiyun { \
33*4882a593Smuzhiyun unsigned long flags; \
34*4882a593Smuzhiyun \
35*4882a593Smuzhiyun powerpc_local_irq_pmu_save(flags); \
36*4882a593Smuzhiyun l->v c_op i; \
37*4882a593Smuzhiyun powerpc_local_irq_pmu_restore(flags); \
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun #define LOCAL_OP_RETURN(op, c_op) \
41*4882a593Smuzhiyun static __inline__ long local_##op##_return(long a, local_t *l) \
42*4882a593Smuzhiyun { \
43*4882a593Smuzhiyun long t; \
44*4882a593Smuzhiyun unsigned long flags; \
45*4882a593Smuzhiyun \
46*4882a593Smuzhiyun powerpc_local_irq_pmu_save(flags); \
47*4882a593Smuzhiyun t = (l->v c_op a); \
48*4882a593Smuzhiyun powerpc_local_irq_pmu_restore(flags); \
49*4882a593Smuzhiyun \
50*4882a593Smuzhiyun return t; \
51*4882a593Smuzhiyun }
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun #define LOCAL_OPS(op, c_op) \
54*4882a593Smuzhiyun LOCAL_OP(op, c_op) \
55*4882a593Smuzhiyun LOCAL_OP_RETURN(op, c_op)
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun LOCAL_OPS(add, +=)
58*4882a593Smuzhiyun LOCAL_OPS(sub, -=)
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun #define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
61*4882a593Smuzhiyun #define local_inc_return(l) local_add_return(1LL, l)
62*4882a593Smuzhiyun #define local_inc(l) local_inc_return(l)
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun /*
65*4882a593Smuzhiyun * local_inc_and_test - increment and test
66*4882a593Smuzhiyun * @l: pointer of type local_t
67*4882a593Smuzhiyun *
68*4882a593Smuzhiyun * Atomically increments @l by 1
69*4882a593Smuzhiyun * and returns true if the result is zero, or false for all
70*4882a593Smuzhiyun * other cases.
71*4882a593Smuzhiyun */
72*4882a593Smuzhiyun #define local_inc_and_test(l) (local_inc_return(l) == 0)
73*4882a593Smuzhiyun
74*4882a593Smuzhiyun #define local_dec_return(l) local_sub_return(1LL, l)
75*4882a593Smuzhiyun #define local_dec(l) local_dec_return(l)
76*4882a593Smuzhiyun #define local_sub_and_test(a, l) (local_sub_return((a), (l)) == 0)
77*4882a593Smuzhiyun #define local_dec_and_test(l) (local_dec_return((l)) == 0)
78*4882a593Smuzhiyun
local_cmpxchg(local_t * l,long o,long n)79*4882a593Smuzhiyun static __inline__ long local_cmpxchg(local_t *l, long o, long n)
80*4882a593Smuzhiyun {
81*4882a593Smuzhiyun long t;
82*4882a593Smuzhiyun unsigned long flags;
83*4882a593Smuzhiyun
84*4882a593Smuzhiyun powerpc_local_irq_pmu_save(flags);
85*4882a593Smuzhiyun t = l->v;
86*4882a593Smuzhiyun if (t == o)
87*4882a593Smuzhiyun l->v = n;
88*4882a593Smuzhiyun powerpc_local_irq_pmu_restore(flags);
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun return t;
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun
local_xchg(local_t * l,long n)93*4882a593Smuzhiyun static __inline__ long local_xchg(local_t *l, long n)
94*4882a593Smuzhiyun {
95*4882a593Smuzhiyun long t;
96*4882a593Smuzhiyun unsigned long flags;
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun powerpc_local_irq_pmu_save(flags);
99*4882a593Smuzhiyun t = l->v;
100*4882a593Smuzhiyun l->v = n;
101*4882a593Smuzhiyun powerpc_local_irq_pmu_restore(flags);
102*4882a593Smuzhiyun
103*4882a593Smuzhiyun return t;
104*4882a593Smuzhiyun }
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun /**
107*4882a593Smuzhiyun * local_add_unless - add unless the number is a given value
108*4882a593Smuzhiyun * @l: pointer of type local_t
109*4882a593Smuzhiyun * @a: the amount to add to v...
110*4882a593Smuzhiyun * @u: ...unless v is equal to u.
111*4882a593Smuzhiyun *
112*4882a593Smuzhiyun * Atomically adds @a to @l, so long as it was not @u.
113*4882a593Smuzhiyun * Returns non-zero if @l was not @u, and zero otherwise.
114*4882a593Smuzhiyun */
local_add_unless(local_t * l,long a,long u)115*4882a593Smuzhiyun static __inline__ int local_add_unless(local_t *l, long a, long u)
116*4882a593Smuzhiyun {
117*4882a593Smuzhiyun unsigned long flags;
118*4882a593Smuzhiyun int ret = 0;
119*4882a593Smuzhiyun
120*4882a593Smuzhiyun powerpc_local_irq_pmu_save(flags);
121*4882a593Smuzhiyun if (l->v != u) {
122*4882a593Smuzhiyun l->v += a;
123*4882a593Smuzhiyun ret = 1;
124*4882a593Smuzhiyun }
125*4882a593Smuzhiyun powerpc_local_irq_pmu_restore(flags);
126*4882a593Smuzhiyun
127*4882a593Smuzhiyun return ret;
128*4882a593Smuzhiyun }
129*4882a593Smuzhiyun
130*4882a593Smuzhiyun #define local_inc_not_zero(l) local_add_unless((l), 1, 0)
131*4882a593Smuzhiyun
132*4882a593Smuzhiyun /* Use these for per-cpu local_t variables: on some archs they are
133*4882a593Smuzhiyun * much more efficient than these naive implementations. Note they take
134*4882a593Smuzhiyun * a variable, not an address.
135*4882a593Smuzhiyun */
136*4882a593Smuzhiyun
137*4882a593Smuzhiyun #define __local_inc(l) ((l)->v++)
138*4882a593Smuzhiyun #define __local_dec(l) ((l)->v++)
139*4882a593Smuzhiyun #define __local_add(i,l) ((l)->v+=(i))
140*4882a593Smuzhiyun #define __local_sub(i,l) ((l)->v-=(i))
141*4882a593Smuzhiyun
142*4882a593Smuzhiyun #else /* CONFIG_PPC64 */
143*4882a593Smuzhiyun
144*4882a593Smuzhiyun #include <asm-generic/local.h>
145*4882a593Smuzhiyun
146*4882a593Smuzhiyun #endif /* CONFIG_PPC64 */
147*4882a593Smuzhiyun
148*4882a593Smuzhiyun #endif /* _ARCH_POWERPC_LOCAL_H */
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