spinlock.h

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    1 /*-
    2  * Copyright (c) 2010 Isilon Systems, Inc.
    3  * Copyright (c) 2010 iX Systems, Inc.
    4  * Copyright (c) 2010 Panasas, Inc.
    5  * Copyright (c) 2013-2017 Mellanox Technologies, Ltd.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice unmodified, this list of conditions, and the following
   13  *    disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   28  *
   29  * $FreeBSD$
   30  */
   31 #ifndef _LINUXKPI_LINUX_SPINLOCK_H_
   32 #define _LINUXKPI_LINUX_SPINLOCK_H_
   33 
   34 #include <asm/atomic.h>
   35 #include <sys/param.h>
   36 #include <sys/kernel.h>
   37 #include <sys/lock.h>
   38 #include <sys/mutex.h>
   39 #include <sys/kdb.h>
   40 
   41 #include <linux/compiler.h>
   42 #include <linux/rwlock.h>
   43 #include <linux/bottom_half.h>
   44 #include <linux/lockdep.h>
   45 
   46 typedef struct {
   47         struct mtx m;
   48 } spinlock_t;
   49 
   50 /*
   51  * By defining CONFIG_SPIN_SKIP LinuxKPI spinlocks and asserts will be
   52  * skipped during panic(). By default it is disabled due to
   53  * performance reasons.
   54  */
   55 #ifdef CONFIG_SPIN_SKIP
   56 #define SPIN_SKIP(void) unlikely(SCHEDULER_STOPPED() || kdb_active)
   57 #else
   58 #define SPIN_SKIP(void) 0
   59 #endif
   60 
   61 #define spin_lock(_l) do {                      \
   62         if (SPIN_SKIP())                        \
   63                 break;                          \
   64         mtx_lock(&(_l)->m);                     \
   65         local_bh_disable();                     \
   66 } while (0)
   67 
   68 #define spin_lock_bh(_l) do {                   \
   69         spin_lock(_l);                          \
   70         local_bh_disable();                     \
   71 } while (0)
   72 
   73 #define spin_lock_irq(_l) do {                  \
   74         spin_lock(_l);                          \
   75 } while (0)
   76 
   77 #define spin_unlock(_l) do {                    \
   78         if (SPIN_SKIP())                        \
   79                 break;                          \
   80         local_bh_enable();                      \
   81         mtx_unlock(&(_l)->m);                   \
   82 } while (0)
   83 
   84 #define spin_unlock_bh(_l) do {                 \
   85         local_bh_enable();                      \
   86         spin_unlock(_l);                        \
   87 } while (0)
   88 
   89 #define spin_unlock_irq(_l) do {                \
   90         spin_unlock(_l);                        \
   91 } while (0)
   92 
   93 #define spin_trylock(_l) ({                     \
   94         int __ret;                              \
   95         if (SPIN_SKIP()) {                      \
   96                 __ret = 1;                      \
   97         } else {                                \
   98                 __ret = mtx_trylock(&(_l)->m);  \
   99                 if (likely(__ret != 0))         \
  100                         local_bh_disable();     \
  101         }                                       \
  102         __ret;                                  \
  103 })
  104 
  105 #define spin_trylock_irq(_l)                    \
  106         spin_trylock(_l)
  107 
  108 #define spin_trylock_irqsave(_l, flags) ({      \
  109         (flags) = 0;                            \
  110         spin_trylock(_l);                       \
  111 })
  112 
  113 #define spin_lock_nested(_l, _n) do {           \
  114         if (SPIN_SKIP())                        \
  115                 break;                          \
  116         mtx_lock_flags(&(_l)->m, MTX_DUPOK);    \
  117         local_bh_disable();                     \
  118 } while (0)
  119 
  120 #define spin_lock_irqsave(_l, flags) do {       \
  121         (flags) = 0;                            \
  122         spin_lock(_l);                          \
  123 } while (0)
  124 
  125 #define spin_lock_irqsave_nested(_l, flags, _n) do {    \
  126         (flags) = 0;                                    \
  127         spin_lock_nested(_l, _n);                       \
  128 } while (0)
  129 
  130 #define spin_unlock_irqrestore(_l, flags) do {          \
  131         spin_unlock(_l);                                \
  132 } while (0)
  133 
  134 #ifdef WITNESS_ALL
  135 /* NOTE: the maximum WITNESS name is 64 chars */
  136 #define __spin_lock_name(name, file, line)              \
  137         (((const char *){file ":" #line "-" name}) +    \
  138         (sizeof(file) > 16 ? sizeof(file) - 16 : 0))
  139 #else
  140 #define __spin_lock_name(name, file, line)      name
  141 #endif
  142 #define _spin_lock_name(...)            __spin_lock_name(__VA_ARGS__)
  143 #define spin_lock_name(name)            _spin_lock_name(name, __FILE__, __LINE__)
  144 
  145 #define spin_lock_init(lock)    linux_spin_lock_init(lock, spin_lock_name("lnxspin"))
  146 
  147 static inline void
  148 linux_spin_lock_init(spinlock_t *lock, const char *name)
  149 {
  150 
  151         memset(lock, 0, sizeof(*lock));
  152         mtx_init(&lock->m, name, NULL, MTX_DEF | MTX_NOWITNESS);
  153 }
  154 
  155 static inline void
  156 spin_lock_destroy(spinlock_t *lock)
  157 {
  158 
  159        mtx_destroy(&lock->m);
  160 }
  161 
  162 #define DEFINE_SPINLOCK(lock)                                   \
  163         spinlock_t lock;                                        \
  164         MTX_SYSINIT(lock, &(lock).m, spin_lock_name("lnxspin"), MTX_DEF)
  165 
  166 #define assert_spin_locked(_l) do {             \
  167         if (SPIN_SKIP())                        \
  168                 break;                          \
  169         mtx_assert(&(_l)->m, MA_OWNED);         \
  170 } while (0)
  171 
  172 #define atomic_dec_and_lock_irqsave(cnt, lock, flags) \
  173         _atomic_dec_and_lock_irqsave(cnt, lock, &(flags))
  174 static inline int
  175 _atomic_dec_and_lock_irqsave(atomic_t *cnt, spinlock_t *lock,
  176     unsigned long *flags)
  177 {
  178         if (atomic_add_unless(cnt, -1, 1))
  179                 return (0);
  180 
  181         spin_lock_irqsave(lock, *flags);
  182         if (atomic_dec_and_test(cnt))
  183                 return (1);
  184         spin_unlock_irqrestore(lock, *flags);
  185         return (0);
  186 }
  187 
  188 #endif                                  /* _LINUXKPI_LINUX_SPINLOCK_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/compat/linuxkpi/common/include/linux/spinlock.h

FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/spinlock.h