- Reduce number of atomic operations needed to be implemented in asm by

  implementing some of them using existing ones.
- Allow to compile ZFS on all archs and use atomic operations surrounded
  by global mutex on archs we don't have or can't have all atomic
  operations needed by ZFS.

1 files changed, 133 insertions, 0 deletions

diff --git a/sys/cddl/compat/opensolaris/kern/opensolaris_atomic.c b/sys/cddl/compat/opensolaris/kern/opensolaris_atomic.c
new file mode 100644
index 0000000..fb6ef2e
--- /dev/null
+++ b/sys/cddl/compat/opensolaris/kern/opensolaris_atomic.c
@@ -0,0 +1,133 @@
+/*-
+ * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/atomic.h>
+
+#ifdef _KERNEL
+#include <sys/kernel.h>
+
+struct mtx atomic_mtx;
+MTX_SYSINIT(atomic, &atomic_mtx, "atomic", MTX_DEF);
+#else
+#include <pthread.h>
+
+#define	mtx_lock(lock)		pthread_mutex_lock(lock)
+#define	mtx_unlock(lock)	pthread_mutex_unlock(lock)
+
+static pthread_mutex_t atomic_mtx;
+
+static __attribute__((constructor)) void
+atomic_init(void)
+{
+	pthread_mutex_init(&atomic_mtx, NULL);
+}
+#endif
+
+#ifndef __LP64__
+void
+atomic_add_64(volatile uint64_t *target, int64_t delta)
+{
+
+	mtx_lock(&atomic_mtx);
+	*target += delta;
+	mtx_unlock(&atomic_mtx);
+}
+#endif
+
+uint64_t
+atomic_add_64_nv(volatile uint64_t *target, int64_t delta)
+{
+	uint64_t newval;
+
+	mtx_lock(&atomic_mtx);
+	newval = (*target += delta);
+	mtx_unlock(&atomic_mtx);
+	return (newval);
+}
+
+#if defined(__sparc64__) || defined(__powerpc__) || defined(__arm__)
+void
+atomic_or_8(volatile uint8_t *target, uint8_t value)
+{
+	mtx_lock(&atomic_mtx);
+	*target |= value;
+	mtx_unlock(&atomic_mtx);
+}
+#endif
+
+uint8_t
+atomic_or_8_nv(volatile uint8_t *target, uint8_t value)
+{
+	uint8_t newval;
+
+	mtx_lock(&atomic_mtx);
+	newval = (*target |= value);
+	mtx_unlock(&atomic_mtx);
+	return (newval);
+}
+
+#ifndef __LP64__
+void *
+atomic_cas_ptr(volatile void *target, void *cmp,  void *newval)
+{
+	void *oldval, **trg;
+
+	mtx_lock(&atomic_mtx);
+	trg = __DEVOLATILE(void **, target);
+	oldval = *trg;
+	if (oldval == cmp)
+		*trg = newval;
+	mtx_unlock(&atomic_mtx);
+	return (oldval);
+}
+#endif
+
+#ifndef __sparc64__
+uint64_t
+atomic_cas_64(volatile uint64_t *target, uint64_t cmp, uint64_t newval)
+{
+	uint64_t oldval;
+
+	mtx_lock(&atomic_mtx);
+	oldval = *target;
+	if (oldval == cmp)
+		*target = newval;
+	mtx_unlock(&atomic_mtx);
+	return (oldval);
+}
+#endif
+
+void
+membar_producer(void)
+{
+	/* nothing */
+}