diff options
Diffstat (limited to 'sys/compat/linuxkpi/common/include/asm/atomic-long.h')
-rw-r--r-- | sys/compat/linuxkpi/common/include/asm/atomic-long.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/sys/compat/linuxkpi/common/include/asm/atomic-long.h b/sys/compat/linuxkpi/common/include/asm/atomic-long.h new file mode 100644 index 000000000000..c80c348f95f9 --- /dev/null +++ b/sys/compat/linuxkpi/common/include/asm/atomic-long.h @@ -0,0 +1,133 @@ +/*- + * Copyright (c) 2010 Isilon Systems, Inc. + * Copyright (c) 2010 iX Systems, Inc. + * Copyright (c) 2010 Panasas, Inc. + * Copyright (c) 2013-2017 Mellanox Technologies, Ltd. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice unmodified, this list of conditions, and the following + * disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * $FreeBSD$ + */ +#ifndef _ATOMIC_LONG_H_ +#define _ATOMIC_LONG_H_ + +#include <linux/compiler.h> +#include <sys/types.h> +#include <machine/atomic.h> +#define ATOMIC_LONG_INIT(x) { .counter = (x) } + +typedef struct { + volatile long counter; +} atomic_long_t; + +#define atomic_long_add(i, v) atomic_long_add_return((i), (v)) +#define atomic_long_sub(i, v) atomic_long_add_return(-(i), (v)) +#define atomic_long_inc_return(v) atomic_long_add_return(1, (v)) +#define atomic_long_inc_not_zero(v) atomic_long_add_unless((v), 1, 0) + +static inline long +atomic_long_add_return(long i, atomic_long_t *v) +{ + return i + atomic_fetchadd_long(&v->counter, i); +} + +static inline void +atomic_long_set(atomic_long_t *v, long i) +{ + WRITE_ONCE(v->counter, i); +} + +static inline long +atomic_long_read(atomic_long_t *v) +{ + return READ_ONCE(v->counter); +} + +static inline long +atomic_long_inc(atomic_long_t *v) +{ + return atomic_fetchadd_long(&v->counter, 1) + 1; +} + +static inline long +atomic_long_dec(atomic_long_t *v) +{ + return atomic_fetchadd_long(&v->counter, -1) - 1; +} + +static inline long +atomic_long_xchg(atomic_long_t *v, long val) +{ + return atomic_swap_long(&v->counter, val); +} + +static inline long +atomic_long_cmpxchg(atomic_long_t *v, long old, long new) +{ + long ret = old; + + for (;;) { + if (atomic_fcmpset_long(&v->counter, &ret, new)) + break; + if (ret != old) + break; + } + return (ret); +} + +static inline int +atomic_long_add_unless(atomic_long_t *v, long a, long u) +{ + long c = atomic_long_read(v); + + for (;;) { + if (unlikely(c == u)) + break; + if (likely(atomic_fcmpset_long(&v->counter, &c, c + a))) + break; + } + return (c != u); +} + +static inline long +atomic_long_fetch_add_unless(atomic_long_t *v, long a, long u) +{ + long c = atomic_long_read(v); + + for (;;) { + if (unlikely(c == u)) + break; + if (likely(atomic_fcmpset_long(&v->counter, &c, c + a))) + break; + } + return (c); +} + +static inline long +atomic_long_dec_and_test(atomic_long_t *v) +{ + long i = atomic_long_add(-1, v); + return i == 0 ; +} + +#endif /* _ATOMIC_LONG_H_ */ |