1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */
2024b246eSLinus Torvalds #ifndef _ALPHA_LOCAL_H
3024b246eSLinus Torvalds #define _ALPHA_LOCAL_H
4024b246eSLinus Torvalds
5024b246eSLinus Torvalds #include <linux/percpu.h>
660063497SArun Sharma #include <linux/atomic.h>
7024b246eSLinus Torvalds
8024b246eSLinus Torvalds typedef struct
9024b246eSLinus Torvalds {
10024b246eSLinus Torvalds atomic_long_t a;
11024b246eSLinus Torvalds } local_t;
12024b246eSLinus Torvalds
13024b246eSLinus Torvalds #define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
14024b246eSLinus Torvalds #define local_read(l) atomic_long_read(&(l)->a)
15024b246eSLinus Torvalds #define local_set(l,i) atomic_long_set(&(l)->a, (i))
16024b246eSLinus Torvalds #define local_inc(l) atomic_long_inc(&(l)->a)
17024b246eSLinus Torvalds #define local_dec(l) atomic_long_dec(&(l)->a)
18024b246eSLinus Torvalds #define local_add(i,l) atomic_long_add((i),(&(l)->a))
19024b246eSLinus Torvalds #define local_sub(i,l) atomic_long_sub((i),(&(l)->a))
20024b246eSLinus Torvalds
local_add_return(long i,local_t * l)21024b246eSLinus Torvalds static __inline__ long local_add_return(long i, local_t * l)
22024b246eSLinus Torvalds {
23024b246eSLinus Torvalds long temp, result;
24024b246eSLinus Torvalds __asm__ __volatile__(
25024b246eSLinus Torvalds "1: ldq_l %0,%1\n"
26024b246eSLinus Torvalds " addq %0,%3,%2\n"
27024b246eSLinus Torvalds " addq %0,%3,%0\n"
28024b246eSLinus Torvalds " stq_c %0,%1\n"
29024b246eSLinus Torvalds " beq %0,2f\n"
30024b246eSLinus Torvalds ".subsection 2\n"
31024b246eSLinus Torvalds "2: br 1b\n"
32024b246eSLinus Torvalds ".previous"
33024b246eSLinus Torvalds :"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
34024b246eSLinus Torvalds :"Ir" (i), "m" (l->a.counter) : "memory");
35024b246eSLinus Torvalds return result;
36024b246eSLinus Torvalds }
37024b246eSLinus Torvalds
local_sub_return(long i,local_t * l)38024b246eSLinus Torvalds static __inline__ long local_sub_return(long i, local_t * l)
39024b246eSLinus Torvalds {
40024b246eSLinus Torvalds long temp, result;
41024b246eSLinus Torvalds __asm__ __volatile__(
42024b246eSLinus Torvalds "1: ldq_l %0,%1\n"
43024b246eSLinus Torvalds " subq %0,%3,%2\n"
44024b246eSLinus Torvalds " subq %0,%3,%0\n"
45024b246eSLinus Torvalds " stq_c %0,%1\n"
46024b246eSLinus Torvalds " beq %0,2f\n"
47024b246eSLinus Torvalds ".subsection 2\n"
48024b246eSLinus Torvalds "2: br 1b\n"
49024b246eSLinus Torvalds ".previous"
50024b246eSLinus Torvalds :"=&r" (temp), "=m" (l->a.counter), "=&r" (result)
51024b246eSLinus Torvalds :"Ir" (i), "m" (l->a.counter) : "memory");
52024b246eSLinus Torvalds return result;
53024b246eSLinus Torvalds }
54024b246eSLinus Torvalds
local_cmpxchg(local_t * l,long old,long new)55*d994f2c8SUros Bizjak static __inline__ long local_cmpxchg(local_t *l, long old, long new)
56*d994f2c8SUros Bizjak {
57*d994f2c8SUros Bizjak return cmpxchg_local(&l->a.counter, old, new);
58*d994f2c8SUros Bizjak }
59*d994f2c8SUros Bizjak
local_try_cmpxchg(local_t * l,long * old,long new)60*d994f2c8SUros Bizjak static __inline__ bool local_try_cmpxchg(local_t *l, long *old, long new)
61*d994f2c8SUros Bizjak {
62*d994f2c8SUros Bizjak return try_cmpxchg_local(&l->a.counter, (s64 *)old, new);
63*d994f2c8SUros Bizjak }
64*d994f2c8SUros Bizjak
65024b246eSLinus Torvalds #define local_xchg(l, n) (xchg_local(&((l)->a.counter), (n)))
66024b246eSLinus Torvalds
67024b246eSLinus Torvalds /**
68024b246eSLinus Torvalds * local_add_unless - add unless the number is a given value
69024b246eSLinus Torvalds * @l: pointer of type local_t
70024b246eSLinus Torvalds * @a: the amount to add to l...
71024b246eSLinus Torvalds * @u: ...unless l is equal to u.
72024b246eSLinus Torvalds *
73024b246eSLinus Torvalds * Atomically adds @a to @l, so long as it was not @u.
74024b246eSLinus Torvalds * Returns non-zero if @l was not @u, and zero otherwise.
75024b246eSLinus Torvalds */
76024b246eSLinus Torvalds #define local_add_unless(l, a, u) \
77024b246eSLinus Torvalds ({ \
78024b246eSLinus Torvalds long c, old; \
79024b246eSLinus Torvalds c = local_read(l); \
80024b246eSLinus Torvalds for (;;) { \
81024b246eSLinus Torvalds if (unlikely(c == (u))) \
82024b246eSLinus Torvalds break; \
83024b246eSLinus Torvalds old = local_cmpxchg((l), c, c + (a)); \
84024b246eSLinus Torvalds if (likely(old == c)) \
85024b246eSLinus Torvalds break; \
86024b246eSLinus Torvalds c = old; \
87024b246eSLinus Torvalds } \
88024b246eSLinus Torvalds c != (u); \
89024b246eSLinus Torvalds })
90024b246eSLinus Torvalds #define local_inc_not_zero(l) local_add_unless((l), 1, 0)
91024b246eSLinus Torvalds
92024b246eSLinus Torvalds #define local_add_negative(a, l) (local_add_return((a), (l)) < 0)
93024b246eSLinus Torvalds
94024b246eSLinus Torvalds #define local_dec_return(l) local_sub_return(1,(l))
95024b246eSLinus Torvalds
96024b246eSLinus Torvalds #define local_inc_return(l) local_add_return(1,(l))
97024b246eSLinus Torvalds
98024b246eSLinus Torvalds #define local_sub_and_test(i,l) (local_sub_return((i), (l)) == 0)
99024b246eSLinus Torvalds
100024b246eSLinus Torvalds #define local_inc_and_test(l) (local_add_return(1, (l)) == 0)
101024b246eSLinus Torvalds
102024b246eSLinus Torvalds #define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
103024b246eSLinus Torvalds
104024b246eSLinus Torvalds /* Verify if faster than atomic ops */
105024b246eSLinus Torvalds #define __local_inc(l) ((l)->a.counter++)
106024b246eSLinus Torvalds #define __local_dec(l) ((l)->a.counter++)
107024b246eSLinus Torvalds #define __local_add(i,l) ((l)->a.counter+=(i))
108024b246eSLinus Torvalds #define __local_sub(i,l) ((l)->a.counter-=(i))
109024b246eSLinus Torvalds
110024b246eSLinus Torvalds #endif /* _ALPHA_LOCAL_H */
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