Add FreeBSD support to OpenZFS

Add the FreeBSD platform code to the OpenZFS repository.  As of this
commit the source can be compiled and tested on FreeBSD 11 and 12.
Subsequent commits are now required to compile on FreeBSD and Linux.
Additionally, they must pass the ZFS Test Suite on FreeBSD which is
being run by the CI.  As of this commit 1230 tests pass on FreeBSD
and there are no unexpected failures.

Reviewed-by: Sean Eric Fagan <[email protected]>
Reviewed-by: Jorgen Lundman <[email protected]>
Reviewed-by: Richard Laager <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Co-authored-by: Ryan Moeller <[email protected]>
Signed-off-by: Matt Macy <[email protected]>
Signed-off-by: Ryan Moeller <[email protected]>
Closes #898 
Closes #8987 

1 files changed, 188 insertions, 0 deletions

diff --git a/include/os/freebsd/spl/sys/atomic.h b/include/os/freebsd/spl/sys/atomic.h
new file mode 100644
index 000000000..e283c6c0e
--- /dev/null
+++ b/include/os/freebsd/spl/sys/atomic.h
@@ -0,0 +1,188 @@
+/*
+ * Copyright (c) 2007 Pawel Jakub Dawidek <[email protected]>
+ * 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, 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 AUTHORS AND CONTRIBUTORS ``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 AUTHORS OR CONTRIBUTORS 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 _OPENSOLARIS_SYS_ATOMIC_H_
+#define	_OPENSOLARIS_SYS_ATOMIC_H_
+
+#include <sys/types.h>
+#include <machine/atomic.h>
+
+#define	casptr(_a, _b, _c)	\
+	atomic_cmpset_ptr((volatile uintptr_t *)(_a), \
+	    (uintptr_t)(_b), \
+	    (uintptr_t)(_c))
+#define	cas32	atomic_cmpset_32
+#define	atomic_sub_64 atomic_subtract_64
+
+#if defined(__i386__) || defined(KLD_MODULE)
+#define	I386_HAVE_ATOMIC64
+#endif
+
+#if !defined(__LP64__) && !defined(__mips_n32) && \
+	!defined(ARM_HAVE_ATOMIC64) && !defined(I386_HAVE_ATOMIC64)
+extern void atomic_add_64(volatile uint64_t *target, int64_t delta);
+extern void atomic_dec_64(volatile uint64_t *target);
+#endif
+#ifndef __sparc64__
+#if defined(__LP64__) || defined(__mips_n32) ||	\
+    defined(ARM_HAVE_ATOMIC64) || defined(I386_HAVE_ATOMIC64)
+
+#define	membar_producer() wmb()
+
+static __inline uint64_t
+atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
+{
+
+#ifdef __i386__
+	atomic_fcmpset_64(target, &cmp, newval);
+#else
+	atomic_fcmpset_long(target, &cmp, newval);
+#endif
+	return (cmp);
+}
+
+static __inline uint32_t
+atomic_cas_32(volatile uint32_t *target, uint32_t cmp, uint32_t newval)
+{
+
+	atomic_fcmpset_int(target, &cmp, newval);
+	return (cmp);
+}
+
+static __inline uint64_t
+atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
+{
+	uint64_t prev;
+
+	prev = atomic_fetchadd_long(target, delta);
+
+	return (prev + delta);
+}
+
+#else
+extern uint32_t atomic_cas_32(volatile uint32_t *target, uint32_t cmp,
+    uint32_t newval);
+extern uint64_t atomic_cas_64(volatile uint64_t *target, uint64_t cmp,
+    uint64_t newval);
+extern uint64_t atomic_add_64_nv(volatile uint64_t *target, int64_t delta);
+extern void membar_producer(void);
+#endif
+#endif
+extern uint8_t atomic_or_8_nv(volatile uint8_t *target, uint8_t value);
+
+#if defined(__sparc64__) || defined(__powerpc__) || defined(__arm__) || \
+    defined(__mips__) || defined(__aarch64__) || defined(__riscv)
+extern void atomic_or_8(volatile uint8_t *target, uint8_t value);
+#else
+static __inline void
+atomic_or_8(volatile uint8_t *target, uint8_t value)
+{
+	atomic_set_8(target, value);
+}
+#endif
+
+static __inline uint32_t
+atomic_add_32_nv(volatile uint32_t *target, int32_t delta)
+{
+	return (atomic_fetchadd_32(target, delta) + delta);
+}
+
+static __inline uint32_t
+atomic_add_int_nv(volatile uint32_t *target, int delta)
+{
+	return (atomic_add_32_nv(target, delta));
+}
+
+static __inline void
+atomic_dec_32(volatile uint32_t *target)
+{
+	atomic_subtract_32(target, 1);
+}
+
+static __inline uint32_t
+atomic_dec_32_nv(volatile uint32_t *target)
+{
+	return (atomic_fetchadd_32(target, -1) - 1);
+}
+
+#if defined(__LP64__) || defined(__mips_n32) || \
+    defined(ARM_HAVE_ATOMIC64) || defined(I386_HAVE_ATOMIC64)
+static __inline void
+atomic_dec_64(volatile uint64_t *target)
+{
+	atomic_subtract_64(target, 1);
+}
+#endif
+
+static __inline void
+atomic_inc_32(volatile uint32_t *target)
+{
+	atomic_add_32(target, 1);
+}
+
+static __inline uint32_t
+atomic_inc_32_nv(volatile uint32_t *target)
+{
+	return (atomic_add_32_nv(target, 1));
+}
+
+static __inline void
+atomic_inc_64(volatile uint64_t *target)
+{
+	atomic_add_64(target, 1);
+}
+
+static __inline uint64_t
+atomic_inc_64_nv(volatile uint64_t *target)
+{
+	return (atomic_add_64_nv(target, 1));
+}
+
+static __inline uint64_t
+atomic_dec_64_nv(volatile uint64_t *target)
+{
+	return (atomic_add_64_nv(target, -1));
+}
+
+#if !defined(COMPAT_32BIT) && defined(__LP64__)
+static __inline void *
+atomic_cas_ptr(volatile void *target, void *cmp,  void *newval)
+{
+	return ((void *)atomic_cas_64((volatile uint64_t *)target,
+	    (uint64_t)cmp, (uint64_t)newval));
+}
+#else
+static __inline void *
+atomic_cas_ptr(volatile void *target, void *cmp,  void *newval)
+{
+	return ((void *)atomic_cas_32((volatile uint32_t *)target,
+	    (uint32_t)cmp, (uint32_t)newval));
+}
+#endif	/* !defined(COMPAT_32BIT) && defined(__LP64__) */
+
+#endif	/* !_OPENSOLARIS_SYS_ATOMIC_H_ */