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Linux/arch/mips/include/asm/local.h

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  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 
 12 typedef 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  */
 30 static __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    push                                    \n"
 39                 "       .set    arch=r4000                              \n"
 40                 "1:"    __LL    "%1, %2         # local_add_return      \n"
 41                 "       addu    %0, %1, %3                              \n"
 42                         __SC    "%0, %2                                 \n"
 43                 "       beqzl   %0, 1b                                  \n"
 44                 "       addu    %0, %1, %3                              \n"
 45                 "       .set    pop                                     \n"
 46                 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
 47                 : "Ir" (i), "m" (l->a.counter)
 48                 : "memory");
 49         } else if (kernel_uses_llsc) {
 50                 unsigned long temp;
 51 
 52                 __asm__ __volatile__(
 53                 "       .set    push                                    \n"
 54                 "       .set    "MIPS_ISA_ARCH_LEVEL"                   \n"
 55                 "1:"    __LL    "%1, %2         # local_add_return      \n"
 56                 "       addu    %0, %1, %3                              \n"
 57                         __SC    "%0, %2                                 \n"
 58                 "       beqz    %0, 1b                                  \n"
 59                 "       addu    %0, %1, %3                              \n"
 60                 "       .set    pop                                     \n"
 61                 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
 62                 : "Ir" (i), "m" (l->a.counter)
 63                 : "memory");
 64         } else {
 65                 unsigned long flags;
 66 
 67                 local_irq_save(flags);
 68                 result = l->a.counter;
 69                 result += i;
 70                 l->a.counter = result;
 71                 local_irq_restore(flags);
 72         }
 73 
 74         return result;
 75 }
 76 
 77 static __inline__ long local_sub_return(long i, local_t * l)
 78 {
 79         unsigned long result;
 80 
 81         if (kernel_uses_llsc && R10000_LLSC_WAR) {
 82                 unsigned long temp;
 83 
 84                 __asm__ __volatile__(
 85                 "       .set    push                                    \n"
 86                 "       .set    arch=r4000                              \n"
 87                 "1:"    __LL    "%1, %2         # local_sub_return      \n"
 88                 "       subu    %0, %1, %3                              \n"
 89                         __SC    "%0, %2                                 \n"
 90                 "       beqzl   %0, 1b                                  \n"
 91                 "       subu    %0, %1, %3                              \n"
 92                 "       .set    pop                                     \n"
 93                 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
 94                 : "Ir" (i), "m" (l->a.counter)
 95                 : "memory");
 96         } else if (kernel_uses_llsc) {
 97                 unsigned long temp;
 98 
 99                 __asm__ __volatile__(
100                 "       .set    push                                    \n"
101                 "       .set    "MIPS_ISA_ARCH_LEVEL"                   \n"
102                 "1:"    __LL    "%1, %2         # local_sub_return      \n"
103                 "       subu    %0, %1, %3                              \n"
104                         __SC    "%0, %2                                 \n"
105                 "       beqz    %0, 1b                                  \n"
106                 "       subu    %0, %1, %3                              \n"
107                 "       .set    pop                                     \n"
108                 : "=&r" (result), "=&r" (temp), "=m" (l->a.counter)
109                 : "Ir" (i), "m" (l->a.counter)
110                 : "memory");
111         } else {
112                 unsigned long flags;
113 
114                 local_irq_save(flags);
115                 result = l->a.counter;
116                 result -= i;
117                 l->a.counter = result;
118                 local_irq_restore(flags);
119         }
120 
121         return result;
122 }
123 
124 #define local_cmpxchg(l, o, n) \
125         ((long)cmpxchg_local(&((l)->a.counter), (o), (n)))
126 #define local_xchg(l, n) (atomic_long_xchg((&(l)->a), (n)))
127 
128 /**
129  * local_add_unless - add unless the number is a given value
130  * @l: pointer of type local_t
131  * @a: the amount to add to l...
132  * @u: ...unless l is equal to u.
133  *
134  * Atomically adds @a to @l, so long as it was not @u.
135  * Returns non-zero if @l was not @u, and zero otherwise.
136  */
137 #define local_add_unless(l, a, u)                               \
138 ({                                                              \
139         long c, old;                                            \
140         c = local_read(l);                                      \
141         while (c != (u) && (old = local_cmpxchg((l), c, c + (a))) != c) \
142                 c = old;                                        \
143         c != (u);                                               \
144 })
145 #define local_inc_not_zero(l) local_add_unless((l), 1, 0)
146 
147 #define local_dec_return(l) local_sub_return(1, (l))
148 #define local_inc_return(l) local_add_return(1, (l))
149 
150 /*
151  * local_sub_and_test - subtract value from variable and test result
152  * @i: integer value to subtract
153  * @l: pointer of type local_t
154  *
155  * Atomically subtracts @i from @l and returns
156  * true if the result is zero, or false for all
157  * other cases.
158  */
159 #define local_sub_and_test(i, l) (local_sub_return((i), (l)) == 0)
160 
161 /*
162  * local_inc_and_test - increment and test
163  * @l: pointer of type local_t
164  *
165  * Atomically increments @l by 1
166  * and returns true if the result is zero, or false for all
167  * other cases.
168  */
169 #define local_inc_and_test(l) (local_inc_return(l) == 0)
170 
171 /*
172  * local_dec_and_test - decrement by 1 and test
173  * @l: pointer of type local_t
174  *
175  * Atomically decrements @l by 1 and
176  * returns true if the result is 0, or false for all other
177  * cases.
178  */
179 #define local_dec_and_test(l) (local_sub_return(1, (l)) == 0)
180 
181 /*
182  * local_add_negative - add and test if negative
183  * @l: pointer of type local_t
184  * @i: integer value to add
185  *
186  * Atomically adds @i to @l and returns true
187  * if the result is negative, or false when
188  * result is greater than or equal to zero.
189  */
190 #define local_add_negative(i, l) (local_add_return(i, (l)) < 0)
191 
192 /* Use these for per-cpu local_t variables: on some archs they are
193  * much more efficient than these naive implementations.  Note they take
194  * a variable, not an address.
195  */
196 
197 #define __local_inc(l)          ((l)->a.counter++)
198 #define __local_dec(l)          ((l)->a.counter++)
199 #define __local_add(i, l)       ((l)->a.counter+=(i))
200 #define __local_sub(i, l)       ((l)->a.counter-=(i))
201 
202 #endif /* _ARCH_MIPS_LOCAL_H */
203 

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