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#include <linux/irq_work.h>
  25
  26/**
  27 * struct dma_fence_array_cb - callback helper for fence array
  28 * @cb: fence callback structure for signaling
  29 * @array: reference to the parent fence array object
  30 */
  31struct dma_fence_array_cb {
  32        struct dma_fence_cb cb;
  33        struct dma_fence_array *array;
  34};
  35
  36/**
  37 * struct dma_fence_array - fence to represent an array of fences
  38 * @base: fence base class
  39 * @lock: spinlock for fence handling
  40 * @num_fences: number of fences in the array
  41 * @num_pending: fences in the array still pending
  42 * @fences: array of the fences
  43 */
  44struct dma_fence_array {
  45        struct dma_fence base;
  46
  47        spinlock_t lock;
  48        unsigned num_fences;
  49        atomic_t num_pending;
  50        struct dma_fence **fences;
  51
  52        struct irq_work work;
  53};
  54
  55extern const struct dma_fence_ops dma_fence_array_ops;
  56
  57/**
  58 * dma_fence_is_array - check if a fence is from the array subsclass
  59 * @fence: fence to test
  60 *
  61 * Return true if it is a dma_fence_array and false otherwise.
  62 */
  63static inline bool dma_fence_is_array(struct dma_fence *fence)
  64{
  65        return fence->ops == &dma_fence_array_ops;
  66}
  67
  68/**
  69 * to_dma_fence_array - cast a fence to a dma_fence_array
  70 * @fence: fence to cast to a dma_fence_array
  71 *
  72 * Returns NULL if the fence is not a dma_fence_array,
  73 * or the dma_fence_array otherwise.
  74 */
  75static inline struct dma_fence_array *
  76to_dma_fence_array(struct dma_fence *fence)
  77{
  78        if (fence->ops != &dma_fence_array_ops)
  79                return NULL;
  80
  81        return container_of(fence, struct dma_fence_array, base);
  82}
  83
  84struct dma_fence_array *dma_fence_array_create(int num_fences,
  85                                               struct dma_fence **fences,
  86                                               u64 context, unsigned seqno,
  87                                               bool signal_on_any);
  88
  89bool dma_fence_match_context(struct dma_fence *fence, u64 context);
  90
  91#endif /* __LINUX_DMA_FENCE_ARRAY_H */
  92