sys/dev/drm/include/linux/spinlock.h

   1 /*
   2  * Copyright (c) 2015-2016 François Tigeot
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice unmodified, this list of conditions, and the following
  10  *    disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #ifndef _LINUX_SPINLOCK_H_
  28 #define _LINUX_SPINLOCK_H_
  29
  30 #include <sys/spinlock2.h>
  31 #include <sys/lock.h>
  32
  33 #include <linux/irqflags.h>
  34 #include <asm/barrier.h>
  35
  36 #define spin_is_locked(x)       spin_held(x)
  37
  38 #define assert_spin_locked(x)   KKASSERT(lockcountnb(x))
  39
  40 /*
  41  * The spin_lock_irq() family of functions stop hardware interrupts
  42  * from being delivered to the local CPU.
  43  * A crit_enter()/crit_exit() sequence does the same thing on the
  44  * DragonFly kernel
  45  */
  46 static inline void spin_lock_irq(struct lock *lock)
  47 {
  48         lockmgr(lock, LK_EXCLUSIVE);
  49         crit_enter();
  50 }
  51
  52 static inline void spin_unlock_irq(struct lock *lock)
  53 {
  54         crit_exit();
  55         lockmgr(lock, LK_RELEASE);
  56 }
  57
  58 #define spin_lock_irqsave(lock, flags)          do { flags = 0; spin_lock_irq(lock); } while(0)
  59 #define spin_unlock_irqrestore(lock, flags)     spin_unlock_irq(lock)
  60
  61 #endif  /* _LINUX_SPINLOCK_H_ */