atomic-long.h

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    1 /*-
    2  * Copyright (c) 2010 Isilon Systems, Inc.
    3  * Copyright (c) 2010 iX Systems, Inc.
    4  * Copyright (c) 2010 Panasas, Inc.
    5  * Copyright (c) 2013-2017 Mellanox Technologies, Ltd.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice unmodified, this list of conditions, and the following
   13  *    disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  *
   29  * $FreeBSD$
   30  */
   31 #ifndef _LINUXKPI_ASM_ATOMIC_LONG_H_
   32 #define _LINUXKPI_ASM_ATOMIC_LONG_H_
   33 
   34 #include <linux/compiler.h>
   35 #include <sys/types.h>
   36 #include <machine/atomic.h>
   37 #define ATOMIC_LONG_INIT(x)     { .counter = (x) }
   38 
   39 typedef struct {
   40         volatile long counter;
   41 } atomic_long_t;
   42 
   43 #define atomic_long_add(i, v)           atomic_long_add_return((i), (v))
   44 #define atomic_long_sub(i, v)           atomic_long_sub_return((i), (v))
   45 #define atomic_long_inc_return(v)       atomic_long_add_return(1, (v))
   46 #define atomic_long_inc_not_zero(v)     atomic_long_add_unless((v), 1, 0)
   47 
   48 static inline long
   49 atomic_long_add_return(long i, atomic_long_t *v)
   50 {
   51         return i + atomic_fetchadd_long(&v->counter, i);
   52 }
   53 
   54 static inline long
   55 atomic_long_sub_return(long i, atomic_long_t *v)
   56 {
   57         return atomic_fetchadd_long(&v->counter, -i) - i;
   58 }
   59 
   60 static inline void
   61 atomic_long_set(atomic_long_t *v, long i)
   62 {
   63         WRITE_ONCE(v->counter, i);
   64 }
   65 
   66 static inline long
   67 atomic_long_read(atomic_long_t *v)
   68 {
   69         return READ_ONCE(v->counter);
   70 }
   71 
   72 static inline long
   73 atomic_long_inc(atomic_long_t *v)
   74 {
   75         return atomic_fetchadd_long(&v->counter, 1) + 1;
   76 }
   77 
   78 static inline long
   79 atomic_long_dec(atomic_long_t *v)
   80 {
   81         return atomic_fetchadd_long(&v->counter, -1) - 1;
   82 }
   83 
   84 static inline long
   85 atomic_long_xchg(atomic_long_t *v, long val)
   86 {
   87         return atomic_swap_long(&v->counter, val);
   88 }
   89 
   90 static inline long
   91 atomic_long_cmpxchg(atomic_long_t *v, long old, long new)
   92 {
   93         long ret = old;
   94 
   95         for (;;) {
   96                 if (atomic_fcmpset_long(&v->counter, &ret, new))
   97                         break;
   98                 if (ret != old)
   99                         break;
  100         }
  101         return (ret);
  102 }
  103 
  104 static inline int
  105 atomic_long_add_unless(atomic_long_t *v, long a, long u)
  106 {
  107         long c = atomic_long_read(v);
  108 
  109         for (;;) {
  110                 if (unlikely(c == u))
  111                         break;
  112                 if (likely(atomic_fcmpset_long(&v->counter, &c, c + a)))
  113                         break;
  114         }
  115         return (c != u);
  116 }
  117 
  118 static inline long
  119 atomic_long_fetch_add_unless(atomic_long_t *v, long a, long u)
  120 {
  121         long c = atomic_long_read(v);
  122 
  123         for (;;) {
  124                 if (unlikely(c == u))
  125                         break;
  126                 if (likely(atomic_fcmpset_long(&v->counter, &c, c + a)))
  127                         break;
  128         }
  129         return (c);
  130 }
  131 
  132 static inline long
  133 atomic_long_dec_and_test(atomic_long_t *v)
  134 {
  135         long i = atomic_long_add(-1, v);
  136         return i == 0 ;
  137 }
  138 
  139 #endif  /* _LINUXKPI_ASM_ATOMIC_LONG_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/compat/linuxkpi/common/include/asm/atomic-long.h

FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/asm/atomic-long.h