The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/sound/clone.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2007 Ariff Abdullah <ariff@FreeBSD.org>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD$
   29  */
   30 
   31 #ifndef _SND_CLONE_H_
   32 #define _SND_CLONE_H_
   33 
   34 struct snd_clone_entry;
   35 struct snd_clone;
   36 
   37 /*
   38  * 750 milisecond default deadline. Short enough to not cause excessive
   39  * garbage collection, long enough to indicate stalled VFS.
   40  */
   41 #define SND_CLONE_DEADLINE_DEFAULT      750
   42 
   43 /*
   44  * Fit within 24bit MAXMINOR.
   45  */
   46 #define SND_CLONE_MAXUNIT               0xffffff
   47 
   48 /*
   49  * Creation flags, mostly related to the behaviour of garbage collector.
   50  *
   51  * SND_CLONE_ENABLE     - Enable clone allocation.
   52  * SND_CLONE_GC_ENABLE  - Enable garbage collector operation, automatically
   53  *                        or if explicitly called upon.
   54  * SND_CLONE_GC_UNREF   - Garbage collect during unref operation.
   55  * SND_CLONE_GC_LASTREF - Garbage collect during last reference
   56  *                        (refcount = 0)
   57  * SND_CLONE_GC_EXPIRED - Don't garbage collect unless the global clone
   58  *                        handler has been expired.
   59  * SND_CLONE_GC_REVOKE  - Revoke clone invocation status which has been
   60  *                        expired instead of removing and freeing it.
   61  * SND_CLONE_WAITOK     - malloc() is allowed to sleep while allocating
   62  *                        clone entry.
   63  */
   64 #define SND_CLONE_ENABLE        0x00000001
   65 #define SND_CLONE_GC_ENABLE     0x00000002
   66 #define SND_CLONE_GC_UNREF      0x00000004
   67 #define SND_CLONE_GC_LASTREF    0x00000008
   68 #define SND_CLONE_GC_EXPIRED    0x00000010
   69 #define SND_CLONE_GC_REVOKE     0x00000020
   70 #define SND_CLONE_WAITOK        0x80000000
   71 
   72 #define SND_CLONE_GC_MASK       (SND_CLONE_GC_ENABLE  |                 \
   73                                  SND_CLONE_GC_UNREF   |                 \
   74                                  SND_CLONE_GC_LASTREF |                 \
   75                                  SND_CLONE_GC_EXPIRED |                 \
   76                                  SND_CLONE_GC_REVOKE)
   77 
   78 #define SND_CLONE_MASK          (SND_CLONE_ENABLE | SND_CLONE_GC_MASK | \
   79                                  SND_CLONE_WAITOK)
   80 
   81 /*
   82  * Runtime clone device flags
   83  *
   84  * These are mostly private to the clone manager operation:
   85  *
   86  * SND_CLONE_NEW    - New clone allocation in progress.
   87  * SND_CLONE_INVOKE - Cloning being invoked, waiting for next VFS operation.
   88  * SND_CLONE_BUSY   - In progress, being referenced by living thread/proc.
   89  */
   90 #define SND_CLONE_NEW           0x00000001
   91 #define SND_CLONE_INVOKE        0x00000002
   92 #define SND_CLONE_BUSY          0x00000004
   93 
   94 /*
   95  * Nothing important, just for convenience.
   96  */
   97 #define SND_CLONE_ALLOC         (SND_CLONE_NEW | SND_CLONE_INVOKE |     \
   98                                  SND_CLONE_BUSY)
   99 
  100 #define SND_CLONE_DEVMASK       SND_CLONE_ALLOC
  101 
  102 struct snd_clone *snd_clone_create(int, int, int, uint32_t);
  103 int snd_clone_busy(struct snd_clone *);
  104 int snd_clone_enable(struct snd_clone *);
  105 int snd_clone_disable(struct snd_clone *);
  106 int snd_clone_getsize(struct snd_clone *);
  107 int snd_clone_getmaxunit(struct snd_clone *);
  108 int snd_clone_setmaxunit(struct snd_clone *, int);
  109 int snd_clone_getdeadline(struct snd_clone *);
  110 int snd_clone_setdeadline(struct snd_clone *, int);
  111 uint32_t snd_clone_getflags(struct snd_clone *);
  112 uint32_t snd_clone_setflags(struct snd_clone *, uint32_t);
  113 uint32_t snd_clone_getdevflags(struct cdev *);
  114 uint32_t snd_clone_setdevflags(struct cdev *, uint32_t);
  115 int snd_clone_gc(struct snd_clone *);
  116 void snd_clone_destroy(struct snd_clone *);
  117 int snd_clone_acquire(struct cdev *);
  118 int snd_clone_release(struct cdev *);
  119 int snd_clone_ref(struct cdev *);
  120 int snd_clone_unref(struct cdev *);
  121 void snd_clone_register(struct snd_clone_entry *, struct cdev *);
  122 struct snd_clone_entry *snd_clone_alloc(struct snd_clone *, struct cdev **,
  123     int *, int);
  124 
  125 #define snd_clone_enabled(x)    ((x) != NULL &&                         \
  126                                 (snd_clone_getflags(x) & SND_CLONE_ENABLE))
  127 #define snd_clone_disabled(x)   (!snd_clone_enabled(x))
  128 
  129 #endif /* !_SND_CLONE_H */

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