dma-fence-unwrap.h

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2022 Advanced Micro Devices, Inc.
 * Authors:
 *  Christian König <christian.koenig@amd.com>
 */
 
#ifndef __LINUX_DMA_FENCE_UNWRAP_H
#define __LINUX_DMA_FENCE_UNWRAP_H
 
struct dma_fence;
 
struct dma_fence_unwrap {
    struct dma_fence *chain;
    struct dma_fence *array;
    unsigned int index;
};
 
struct dma_fence *dma_fence_unwrap_first(struct dma_fence *head,
                     struct dma_fence_unwrap *cursor);
struct dma_fence *dma_fence_unwrap_next(struct dma_fence_unwrap *cursor);
 
#define dma_fence_unwrap_for_each(fence, cursor, head)          \
    for (fence = dma_fence_unwrap_first(head, cursor); fence;   \
         fence = dma_fence_unwrap_next(cursor))
 
struct dma_fence *__dma_fence_unwrap_merge(unsigned int num_fences,
                       struct dma_fence **fences,
                       struct dma_fence_unwrap *cursors);
 
int dma_fence_dedup_array(struct dma_fence **array, int num_fences);
 
#define dma_fence_unwrap_merge(...)                 \
    ({                              \
        struct dma_fence *__f[] = { __VA_ARGS__ };      \
        struct dma_fence_unwrap __c[ARRAY_SIZE(__f)];       \
                                    \
        __dma_fence_unwrap_merge(ARRAY_SIZE(__f), __f, __c);    \
    })
 
#endif