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1#ifndef _ARCH_MIPS_LOCAL_H
2#define _ARCH_MIPS_LOCAL_H
3
4#include <linux/percpu.h>
5#include <linux/bitops.h>
6#include <linux/atomic.h>
7#include <asm/cmpxchg.h>
8#include <asm/war.h>
9
10typedef struct
11{
12 atomic_long_t a;
13} local_t;
14
15#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
16
17#define local_read(l) atomic_long_read(&(l)->a)
18#define local_set(l, i) atomic_long_set(&(l)->a, (i))
19
20#define local_add(i, l) atomic_long_add((i), (&(l)->a))
21#define local_sub(i, l) atomic_long_sub((i), (&(l)->a))
22#define local_inc(l) atomic_long_inc(&(l)->a)
23#define local_dec(l) atomic_long_dec(&(l)->a)
24
25/*
26 * Same as above, but return the result value
27 */
28static __inline__ long local_add_return(long i, local_t * l)
29{
30 unsigned long result;
31
32 if (kernel_uses_llsc && R10000_LLSC_WAR) {
33 unsigned long temp;
34
35 __asm__ __volatile__(
36 " .set mips3 \n"
37 "1:" __LL "%1, %2 # local_add_return \n"
38 " addu %0, %1, %3 \n"
39 __SC "%0, %2 \n"
40 " beqzl %0, 1b \n"
41 " addu %0, %1, %3 \n"
42 " .set mips0 \n"
43 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
44 : "Ir" (i), "m" (l->a.counter)
45 : "memory");
46 } else if (kernel_uses_llsc) {
47 unsigned long temp;
48
49 __asm__ __volatile__(
50 " .set mips3 \n"
51 "1:" __LL "%1, %2 # local_add_return \n"
52 " addu %0, %1, %3 \n"
53 __SC "%0, %2 \n"
54 " beqz %0, 1b \n"
55 " addu %0, %1, %3 \n"
56 " .set mips0 \n"
57 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
58 : "Ir" (i), "m" (l->a.counter)
59 : "memory");
60 } else {
61 unsigned long flags;
62
63 local_irq_save(flags);
64 result = l->a.counter;
65 result += i;
66 l->a.counter = result;
67 local_irq_restore(flags);
68 }
69
70 return result;
71}
72
73static __inline__ long local_sub_return(long i, local_t * l)
74{
75 unsigned long result;
76
77 if (kernel_uses_llsc && R10000_LLSC_WAR) {
78 unsigned long temp;
79
80 __asm__ __volatile__(
81 " .set mips3 \n"
82 "1:" __LL "%1, %2 # local_sub_return \n"
83 " subu %0, %1, %3 \n"
84 __SC "%0, %2 \n"
85 " beqzl %0, 1b \n"
86 " subu %0, %1, %3 \n"
87 " .set mips0 \n"
88 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
89 : "Ir" (i), "m" (l->a.counter)
90 : "memory");
91 } else if (kernel_uses_llsc) {
92 unsigned long temp;
93
94 __asm__ __volatile__(
95 " .set mips3 \n"
96 "1:" __LL "%1, %2 # local_sub_return \n"
97 " subu %0, %1, %3 \n"
98 __SC "%0, %2 \n"
99 " beqz %0, 1b \n"
100 " subu %0, %1, %3 \n"
101 " .set mips0 \n"
102 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
103 : "Ir" (i), "m" (l->a.counter)
104 : "memory");
105 } else {
106 unsigned long flags;
107
108 local_irq_save(flags);
109 result = l->a.counter;
110 result -= i;
111 l->a.counter = result;
112 local_irq_restore(flags);
113 }
114
115 return result;
116}
117
118#define local_cmpxchg(l, o, n) \
119 ((long)cmpxchg_local(&((l)->a.counter), (o), (n)))
120#define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
121
122/**
123 * local_add_unless - add unless the number is a given value
124 * @l: pointer of type local_t
125 * @a: the amount to add to l...
126 * @u: ...unless l is equal to u.
127 *
128 * Atomically adds @a to @l, so long as it was not @u.
129 * Returns non-zero if @l was not @u, and zero otherwise.
130 */
131#define local_add_unless(l, a, u) \
132({ \
133 long c, old; \
134 c = local_read(l); \
135 while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \
136 c = old; \
137 c != (u); \
138})
139#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
140
141#define local_dec_return(l) local_sub_return(1, (l))
142#define local_inc_return(l) local_add_return(1, (l))
143
144/*
145 * local_sub_and_test - subtract value from variable and test result
146 * @i: integer value to subtract
147 * @l: pointer of type local_t
148 *
149 * Atomically subtracts @i from @l and returns
150 * true if the result is zero, or false for all
151 * other cases.
152 */
153#define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0)
154
155/*
156 * local_inc_and_test - increment and test
157 * @l: pointer of type local_t
158 *
159 * Atomically increments @l by 1
160 * and returns true if the result is zero, or false for all
161 * other cases.
162 */
163#define local_inc_and_test(l) (local_inc_return(l) == 0)
164
165/*
166 * local_dec_and_test - decrement by 1 and test
167 * @l: pointer of type local_t
168 *
169 * Atomically decrements @l by 1 and
170 * returns true if the result is 0, or false for all other
171 * cases.
172 */
173#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
174
175/*
176 * local_add_negative - add and test if negative
177 * @l: pointer of type local_t
178 * @i: integer value to add
179 *
180 * Atomically adds @i to @l and returns true
181 * if the result is negative, or false when
182 * result is greater than or equal to zero.
183 */
184#define local_add_negative(i, l) (local_add_return(i, (l)) < 0)
185
186/* Use these for per-cpu local_t variables: on some archs they are
187 * much more efficient than these naive implementations. Note they take
188 * a variable, not an address.
189 */
190
191#define __local_inc(l) ((l)->a.counter++)
192#define __local_dec(l) ((l)->a.counter++)
193#define __local_add(i, l) ((l)->a.counter+=(i))
194#define __local_sub(i, l) ((l)->a.counter-=(i))
195
196#endif /* _ARCH_MIPS_LOCAL_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ARCH_MIPS_LOCAL_H
3#define _ARCH_MIPS_LOCAL_H
4
5#include <linux/percpu.h>
6#include <linux/bitops.h>
7#include <linux/atomic.h>
8#include <asm/cmpxchg.h>
9#include <asm/compiler.h>
10#include <asm/war.h>
11
12typedef struct
13{
14 atomic_long_t a;
15} local_t;
16
17#define LOCAL_INIT(i) { ATOMIC_LONG_INIT(i) }
18
19#define local_read(l) atomic_long_read(&(l)->a)
20#define local_set(l, i) atomic_long_set(&(l)->a, (i))
21
22#define local_add(i, l) atomic_long_add((i), (&(l)->a))
23#define local_sub(i, l) atomic_long_sub((i), (&(l)->a))
24#define local_inc(l) atomic_long_inc(&(l)->a)
25#define local_dec(l) atomic_long_dec(&(l)->a)
26
27/*
28 * Same as above, but return the result value
29 */
30static __inline__ long local_add_return(long i, local_t * l)
31{
32 unsigned long result;
33
34 if (kernel_uses_llsc && R10000_LLSC_WAR) {
35 unsigned long temp;
36
37 __asm__ __volatile__(
38 " .set arch=r4000 \n"
39 "1:" __LL "%1, %2 # local_add_return \n"
40 " addu %0, %1, %3 \n"
41 __SC "%0, %2 \n"
42 " beqzl %0, 1b \n"
43 " addu %0, %1, %3 \n"
44 " .set mips0 \n"
45 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
46 : "Ir" (i), "m" (l->a.counter)
47 : "memory");
48 } else if (kernel_uses_llsc) {
49 unsigned long temp;
50
51 __asm__ __volatile__(
52 " .set "MIPS_ISA_ARCH_LEVEL" \n"
53 "1:" __LL "%1, %2 # local_add_return \n"
54 " addu %0, %1, %3 \n"
55 __SC "%0, %2 \n"
56 " beqz %0, 1b \n"
57 " addu %0, %1, %3 \n"
58 " .set mips0 \n"
59 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
60 : "Ir" (i), "m" (l->a.counter)
61 : "memory");
62 } else {
63 unsigned long flags;
64
65 local_irq_save(flags);
66 result = l->a.counter;
67 result += i;
68 l->a.counter = result;
69 local_irq_restore(flags);
70 }
71
72 return result;
73}
74
75static __inline__ long local_sub_return(long i, local_t * l)
76{
77 unsigned long result;
78
79 if (kernel_uses_llsc && R10000_LLSC_WAR) {
80 unsigned long temp;
81
82 __asm__ __volatile__(
83 " .set arch=r4000 \n"
84 "1:" __LL "%1, %2 # local_sub_return \n"
85 " subu %0, %1, %3 \n"
86 __SC "%0, %2 \n"
87 " beqzl %0, 1b \n"
88 " subu %0, %1, %3 \n"
89 " .set mips0 \n"
90 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
91 : "Ir" (i), "m" (l->a.counter)
92 : "memory");
93 } else if (kernel_uses_llsc) {
94 unsigned long temp;
95
96 __asm__ __volatile__(
97 " .set "MIPS_ISA_ARCH_LEVEL" \n"
98 "1:" __LL "%1, %2 # local_sub_return \n"
99 " subu %0, %1, %3 \n"
100 __SC "%0, %2 \n"
101 " beqz %0, 1b \n"
102 " subu %0, %1, %3 \n"
103 " .set mips0 \n"
104 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
105 : "Ir" (i), "m" (l->a.counter)
106 : "memory");
107 } else {
108 unsigned long flags;
109
110 local_irq_save(flags);
111 result = l->a.counter;
112 result -= i;
113 l->a.counter = result;
114 local_irq_restore(flags);
115 }
116
117 return result;
118}
119
120#define local_cmpxchg(l, o, n) \
121 ((long)cmpxchg_local(&((l)->a.counter), (o), (n)))
122#define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
123
124/**
125 * local_add_unless - add unless the number is a given value
126 * @l: pointer of type local_t
127 * @a: the amount to add to l...
128 * @u: ...unless l is equal to u.
129 *
130 * Atomically adds @a to @l, so long as it was not @u.
131 * Returns non-zero if @l was not @u, and zero otherwise.
132 */
133#define local_add_unless(l, a, u) \
134({ \
135 long c, old; \
136 c = local_read(l); \
137 while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \
138 c = old; \
139 c != (u); \
140})
141#define local_inc_not_zero(l) local_add_unless((l), 1, 0)
142
143#define local_dec_return(l) local_sub_return(1, (l))
144#define local_inc_return(l) local_add_return(1, (l))
145
146/*
147 * local_sub_and_test - subtract value from variable and test result
148 * @i: integer value to subtract
149 * @l: pointer of type local_t
150 *
151 * Atomically subtracts @i from @l and returns
152 * true if the result is zero, or false for all
153 * other cases.
154 */
155#define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0)
156
157/*
158 * local_inc_and_test - increment and test
159 * @l: pointer of type local_t
160 *
161 * Atomically increments @l by 1
162 * and returns true if the result is zero, or false for all
163 * other cases.
164 */
165#define local_inc_and_test(l) (local_inc_return(l) == 0)
166
167/*
168 * local_dec_and_test - decrement by 1 and test
169 * @l: pointer of type local_t
170 *
171 * Atomically decrements @l by 1 and
172 * returns true if the result is 0, or false for all other
173 * cases.
174 */
175#define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
176
177/*
178 * local_add_negative - add and test if negative
179 * @l: pointer of type local_t
180 * @i: integer value to add
181 *
182 * Atomically adds @i to @l and returns true
183 * if the result is negative, or false when
184 * result is greater than or equal to zero.
185 */
186#define local_add_negative(i, l) (local_add_return(i, (l)) < 0)
187
188/* Use these for per-cpu local_t variables: on some archs they are
189 * much more efficient than these naive implementations. Note they take
190 * a variable, not an address.
191 */
192
193#define __local_inc(l) ((l)->a.counter++)
194#define __local_dec(l) ((l)->a.counter++)
195#define __local_add(i, l) ((l)->a.counter+=(i))
196#define __local_sub(i, l) ((l)->a.counter-=(i))
197
198#endif /* _ARCH_MIPS_LOCAL_H */