svn commit: r293194 - in head/sys/compat/linuxkpi/common: include/linux src
Hans Petter Selasky
hselasky at FreeBSD.org
Tue Jan 5 12:22:46 UTC 2016
Author: hselasky
Date: Tue Jan 5 12:22:45 2016
New Revision: 293194
URL: https://svnweb.freebsd.org/changeset/base/293194
Log:
Implement RCU mechanism using shared exclusive locks.
MFC after: 1 week
Sponsored by: Mellanox Technologies
Added:
head/sys/compat/linuxkpi/common/include/linux/rcupdate.h (contents, props changed)
Modified:
head/sys/compat/linuxkpi/common/src/linux_compat.c
Added: head/sys/compat/linuxkpi/common/include/linux/rcupdate.h
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/compat/linuxkpi/common/include/linux/rcupdate.h Tue Jan 5 12:22:45 2016 (r293194)
@@ -0,0 +1,76 @@
+/*-
+ * 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 _LINUX_RCUPDATE_H_
+#define _LINUX_RCUPDATE_H_
+
+#include <sys/param.h>
+#include <sys/lock.h>
+#include <sys/sx.h>
+
+extern struct sx linux_global_rcu_lock;
+
+struct rcu_head {
+};
+
+typedef void (*rcu_callback_t)(struct rcu_head *);
+
+static inline void
+call_rcu(struct rcu_head *ptr, rcu_callback_t func)
+{
+ sx_xlock(&linux_global_rcu_lock);
+ func(ptr);
+ sx_xunlock(&linux_global_rcu_lock);
+}
+
+static inline void
+rcu_read_lock(void)
+{
+ sx_slock(&linux_global_rcu_lock);
+}
+
+static inline void
+rcu_read_unlock(void)
+{
+ sx_sunlock(&linux_global_rcu_lock);
+}
+
+static inline void
+rcu_barrier(void)
+{
+ sx_xlock(&linux_global_rcu_lock);
+ sx_xunlock(&linux_global_rcu_lock);
+}
+
+static inline void
+synchronize_rcu(void)
+{
+ sx_xlock(&linux_global_rcu_lock);
+ sx_xunlock(&linux_global_rcu_lock);
+}
+
+#endif /* _LINUX_RCUPDATE_H_ */
Modified: head/sys/compat/linuxkpi/common/src/linux_compat.c
==============================================================================
--- head/sys/compat/linuxkpi/common/src/linux_compat.c Tue Jan 5 10:25:22 2016 (r293193)
+++ head/sys/compat/linuxkpi/common/src/linux_compat.c Tue Jan 5 12:22:45 2016 (r293194)
@@ -2,7 +2,7 @@
* Copyright (c) 2010 Isilon Systems, Inc.
* Copyright (c) 2010 iX Systems, Inc.
* Copyright (c) 2010 Panasas, Inc.
- * Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
+ * Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -65,6 +65,7 @@ __FBSDID("$FreeBSD$");
#include <linux/netdevice.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
+#include <linux/rcupdate.h>
#include <vm/vm_pager.h>
@@ -84,6 +85,7 @@ struct list_head pci_drivers;
struct list_head pci_devices;
struct net init_net;
spinlock_t pci_lock;
+struct sx linux_global_rcu_lock;
unsigned long linux_timer_hz_mask;
@@ -1142,6 +1144,8 @@ linux_compat_init(void *arg)
struct sysctl_oid *rootoid;
int i;
+ sx_init(&linux_global_rcu_lock, "LinuxGlobalRCU");
+
rootoid = SYSCTL_ADD_ROOT_NODE(NULL,
OID_AUTO, "sys", CTLFLAG_RD|CTLFLAG_MPSAFE, NULL, "sys");
kobject_init(&linux_class_root, &linux_class_ktype);
@@ -1171,6 +1175,9 @@ linux_compat_uninit(void *arg)
linux_kobject_kfree_name(&linux_class_root);
linux_kobject_kfree_name(&linux_root_device.kobj);
linux_kobject_kfree_name(&linux_class_misc.kobj);
+
+ synchronize_rcu();
+ sx_destroy(&linux_global_rcu_lock);
}
SYSUNINIT(linux_compat, SI_SUB_DRIVERS, SI_ORDER_SECOND, linux_compat_uninit, NULL);
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