LXR linux/include/linux/dma-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_DMA_FENCE_ARRAY_H
  21#define __LINUX_DMA_FENCE_ARRAY_H
  22
  23#include <linux/dma-fence.h>
  24
  25/**
  26 * struct dma_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 */
  30struct dma_fence_array_cb {
  31        struct dma_fence_cb cb;
  32        struct dma_fence_array *array;
  33};
  34
  35/**
  36 * struct dma_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 */
  43struct dma_fence_array {
  44        struct dma_fence base;
  45
  46        spinlock_t lock;
  47        unsigned num_fences;
  48        atomic_t num_pending;
  49        struct dma_fence **fences;
  50};
  51
  52extern const struct dma_fence_ops dma_fence_array_ops;
  53
  54/**
  55 * dma_fence_is_array - check if a fence is from the array subsclass
  56 * @fence: fence to test
  57 *
  58 * Return true if it is a dma_fence_array and false otherwise.
  59 */
  60static inline bool dma_fence_is_array(struct dma_fence *fence)
  61{
  62        return fence->ops == &dma_fence_array_ops;
  63}
  64
  65/**
  66 * to_dma_fence_array - cast a fence to a dma_fence_array
  67 * @fence: fence to cast to a dma_fence_array
  68 *
  69 * Returns NULL if the fence is not a dma_fence_array,
  70 * or the dma_fence_array otherwise.
  71 */
  72static inline struct dma_fence_array *
  73to_dma_fence_array(struct dma_fence *fence)
  74{
  75        if (fence->ops != &dma_fence_array_ops)
  76                return NULL;
  77
  78        return container_of(fence, struct dma_fence_array, base);
  79}
  80
  81struct dma_fence_array *dma_fence_array_create(int num_fences,
  82                                               struct dma_fence **fences,
  83                                               u64 context, unsigned seqno,
  84                                               bool signal_on_any);
  85
  86bool dma_fence_match_context(struct dma_fence *fence, u64 context);
  87
  88#endif /* __LINUX_DMA_FENCE_ARRAY_H */
  89