Author: hselasky
Date: Thu Jan 21 17:56:23 2016
New Revision: 294521
URL: https://svnweb.freebsd.org/changeset/base/294521
Log:
Implement 64-bit atomic operations for the LinuxKPI.
MFC after: 1 week
Sponsored by: Mellanox Technologies
Added:
head/sys/compat/linuxkpi/common/include/asm/atomic64.h (contents, props
changed)
Added: head/sys/compat/linuxkpi/common/include/asm/atomic64.h
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/compat/linuxkpi/common/include/asm/atomic64.h Thu Jan 21
17:56:23 2016 (r294521)
@@ -0,0 +1,104 @@
+/*-
+ * Copyright (c) 2016 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 _ASM_ATOMIC64_H_
+#define _ASM_ATOMIC64_H_
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+#include <machine/atomic.h>
+
+typedef struct {
+ volatile int64_t counter;
+} atomic64_t;
+
+/*------------------------------------------------------------------------*
+ * 64-bit atomic operations
+ *------------------------------------------------------------------------*/
+
+#define atomic64_add(i, v) atomic64_add_return((i), (v))
+#define atomic64_sub(i, v) atomic64_sub_return((i), (v))
+#define atomic64_inc_return(v) atomic64_add_return(1, (v))
+#define atomic64_add_negative(i, v) (atomic64_add_return((i), (v))
< 0)
+#define atomic64_sub_and_test(i, v) (atomic64_sub_return((i), (v))
== 0)
+#define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) ==
0)
+#define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) ==
0)
+#define atomic64_dec_return(v) atomic64_sub_return(1, (v))
+#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
+
+static inline int64_t
+atomic64_add_return(int64_t i, atomic64_t *v)
+{
+ return i + atomic_fetchadd_64(&v->counter, i);
+}
+
+static inline int64_t
+atomic64_sub_return(int64_t i, atomic64_t *v)
+{
+ return atomic_fetchadd_64(&v->counter, -i) - i;
+}
+
+static inline void
+atomic64_set(atomic64_t *v, int64_t i)
+{
+ atomic_store_rel_64(&v->counter, i);
+}
+
+static inline int64_t
+atomic64_read(atomic64_t *v)
+{
+ return atomic_load_acq_64(&v->counter);
+}
+
+static inline int64_t
+atomic64_inc(atomic64_t *v)
+{
+ return atomic_fetchadd_64(&v->counter, 1) + 1;
+}
+
+static inline int64_t
+atomic64_dec(atomic64_t *v)
+{
+ return atomic_fetchadd_64(&v->counter, -1) - 1;
+}
+
+static inline int64_t
+atomic64_add_unless(atomic64_t *v, int64_t a, int64_t u)
+{
+ int64_t c;
+
+ for (;;) {
+ c = atomic64_read(v);
+ if (unlikely(c == u))
+ break;
+ if (likely(atomic_cmpset_64(&v->counter, c, c + a)))
+ break;
+ }
+ return (c != u);
+}
+
+#endif /* _ASM_ATOMIC64_H_ */
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