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  1. /*
  2.  * Header file for reservations for dma-buf and ttm
  3.  *
  4.  * Copyright(C) 2011 Linaro Limited. All rights reserved.
  5.  * Copyright (C) 2012-2013 Canonical Ltd
  6.  * Copyright (C) 2012 Texas Instruments
  7.  *
  8.  * Authors:
  9.  * Rob Clark <robdclark@gmail.com>
  10.  * Maarten Lankhorst <maarten.lankhorst@canonical.com>
  11.  * Thomas Hellstrom <thellstrom-at-vmware-dot-com>
  12.  *
  13.  * Based on bo.c which bears the following copyright notice,
  14.  * but is dual licensed:
  15.  *
  16.  * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
  17.  * All Rights Reserved.
  18.  *
  19.  * Permission is hereby granted, free of charge, to any person obtaining a
  20.  * copy of this software and associated documentation files (the
  21.  * "Software"), to deal in the Software without restriction, including
  22.  * without limitation the rights to use, copy, modify, merge, publish,
  23.  * distribute, sub license, and/or sell copies of the Software, and to
  24.  * permit persons to whom the Software is furnished to do so, subject to
  25.  * the following conditions:
  26.  *
  27.  * The above copyright notice and this permission notice (including the
  28.  * next paragraph) shall be included in all copies or substantial portions
  29.  * of the Software.
  30.  *
  31.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  32.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  33.  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  34.  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  35.  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  36.  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  37.  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  38.  */
  39. #ifndef _LINUX_RESERVATION_H
  40. #define _LINUX_RESERVATION_H
  41.  
  42. #include <linux/ww_mutex.h>
  43.  
  44. extern struct ww_class reservation_ww_class;
  45.  
  46. struct reservation_object {
  47.         struct ww_mutex lock;
  48. };
  49.  
  50. static inline void
  51. reservation_object_init(struct reservation_object *obj)
  52. {
  53.         ww_mutex_init(&obj->lock, &reservation_ww_class);
  54. }
  55.  
  56. static inline void
  57. reservation_object_fini(struct reservation_object *obj)
  58. {
  59.         ww_mutex_destroy(&obj->lock);
  60. }
  61.  
  62. #endif /* _LINUX_RESERVATION_H */
  63.