Date: Tue, 5 Jan 2016 12:22:45 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r293194 - in head/sys/compat/linuxkpi/common: include/linux src Message-ID: <201601051222.u05CMjq5014845@repo.freebsd.org>
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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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