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

     /*-
      * Copyright (c) 2017 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 _LINUXKPI_LINUX_WW_MUTEX_H_
    #define _LINUXKPI_LINUX_WW_MUTEX_H_
    
    #include <sys/param.h>
    #include <sys/proc.h>
    #include <sys/condvar.h>
    #include <sys/kernel.h>
    
    #include <linux/mutex.h>
    
    struct ww_class {
            const char *mutex_name;
    };
    
    struct ww_acquire_ctx {
    };
    
    struct ww_mutex {
            struct mutex base;
            struct cv condvar;
            struct ww_acquire_ctx *ctx;
    };
    
    #define DEFINE_WW_CLASS(name)                                   \
            struct ww_class name = {                                \
                    .mutex_name = mutex_name(#name "_mutex")        \
            }
    
    #define DEFINE_WW_MUTEX(name, ww_class)                                 \
            struct ww_mutex name;                                           \
            static void name##_init(void *arg)                              \
            {                                                               \
                    ww_mutex_init(&name, &ww_class);                        \
            }                                                               \
            SYSINIT(name, SI_SUB_LOCK, SI_ORDER_SECOND, name##_init, NULL)
    
    #define DEFINE_WD_CLASS(name)   DEFINE_WW_CLASS(name)
    
    #define ww_mutex_is_locked(_m) \
            sx_xlocked(&(_m)->base.sx)
    
    #define ww_mutex_lock_slow(_m, _x) \
            ww_mutex_lock(_m, _x)
    
    #define ww_mutex_lock_slow_interruptible(_m, _x) \
            ww_mutex_lock_interruptible(_m, _x)
    
    static inline int __must_check
    ww_mutex_trylock(struct ww_mutex *lock)
    {
            return (mutex_trylock(&lock->base));
    }
    
    extern int linux_ww_mutex_lock_sub(struct ww_mutex *,
        struct ww_acquire_ctx *, int catch_signal);
    
    static inline int
    ww_mutex_lock(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
    {
            if (MUTEX_SKIP())
                    return (0);
            else if ((struct thread *)SX_OWNER(lock->base.sx.sx_lock) == curthread)
                    return (-EALREADY);
            else
                    return (linux_ww_mutex_lock_sub(lock, ctx, 0));
    }
    
    static inline int
    ww_mutex_lock_interruptible(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
    {
            if (MUTEX_SKIP())
                    return (0);
           else if ((struct thread *)SX_OWNER(lock->base.sx.sx_lock) == curthread)
                   return (-EALREADY);
           else
                   return (linux_ww_mutex_lock_sub(lock, ctx, 1));
   }
   
   extern void linux_ww_mutex_unlock_sub(struct ww_mutex *);
   
   static inline void
   ww_mutex_unlock(struct ww_mutex *lock)
   {
           if (MUTEX_SKIP())
                   return;
           else
                   linux_ww_mutex_unlock_sub(lock);
   }
   
   static inline void
   ww_mutex_destroy(struct ww_mutex *lock)
   {
           cv_destroy(&lock->condvar);
           mutex_destroy(&lock->base);
   }
   
   static inline void
   ww_acquire_init(struct ww_acquire_ctx *ctx, struct ww_class *ww_class)
   {
   }
   
   static inline void
   ww_mutex_init(struct ww_mutex *lock, struct ww_class *ww_class)
   {
           linux_mutex_init(&lock->base, ww_class->mutex_name, SX_NOWITNESS);
           cv_init(&lock->condvar, "lkpi-ww");
   }
   
   static inline void
   ww_acquire_fini(struct ww_acquire_ctx *ctx)
   {
   }
   
   static inline void
   ww_acquire_done(struct ww_acquire_ctx *ctx)
   {
   }
   
   #endif                                  /* _LINUXKPI_LINUX_WW_MUTEX_H_ */

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