include/linux/fence-array.h

   1 /*
   2  * fence-array: aggregates fence to be waited together
   3  *
   4  * Copyright (C) 2016 Collabora Ltd
   5  * Copyright (C) 2016 Advanced Micro Devices, Inc.
   6  * Authors:
   7  *      Gustavo Padovan <gustavo@padovan.org>
   8  *      Christian König <christian.koenig@amd.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 as published by
  12  * the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  17  * more details.
  18  */
  19
  20 #ifndef __LINUX_FENCE_ARRAY_H
  21 #define __LINUX_FENCE_ARRAY_H
  22
  23 #include <linux/fence.h>
  24
  25 /**
  26  * struct fence_array_cb - callback helper for fence array
  27  * @cb: fence callback structure for signaling
  28  * @array: reference to the parent fence array object
  29  */
  30 struct fence_array_cb {
  31         struct fence_cb cb;
  32         struct fence_array *array;
  33 };
  34
  35 /**
  36  * struct fence_array - fence to represent an array of fences
  37  * @base: fence base class
  38  * @lock: spinlock for fence handling
  39  * @num_fences: number of fences in the array
  40  * @num_pending: fences in the array still pending
  41  * @fences: array of the fences
  42  */
  43 struct fence_array {
  44         struct fence base;
  45
  46         spinlock_t lock;
  47         unsigned num_fences;
  48         atomic_t num_pending;
  49         struct fence **fences;
  50 };
  51
  52 extern const struct fence_ops fence_array_ops;
  53
  54 /**
  55  * to_fence_array - cast a fence to a fence_array
  56  * @fence: fence to cast to a fence_array
  57  *
  58  * Returns NULL if the fence is not a fence_array,
  59  * or the fence_array otherwise.
  60  */
  61 static inline struct fence_array *to_fence_array(struct fence *fence)
  62 {
  63         if (fence->ops != &fence_array_ops)
  64                 return NULL;
  65
  66         return container_of(fence, struct fence_array, base);
  67 }
  68
  69 struct fence_array *fence_array_create(int num_fences, struct fence **fences,
  70                                        u64 context, unsigned seqno,
  71                                        bool signal_on_any);
  72
  73 #endif /* __LINUX_FENCE_ARRAY_H */