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-rw-r--r--sys/compat/linuxkpi/common/include/asm/atomic-long.h133
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_ */