dma-fence-array.h

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * fence-array: aggregates fence to be waited together
 *
 * Copyright (C) 2016 Collabora Ltd
 * Copyright (C) 2016 Advanced Micro Devices, Inc.
 * Authors:
 *  Gustavo Padovan <gustavo@padovan.org>
 *  Christian König <christian.koenig@amd.com>
 */
 
#ifndef __LINUX_DMA_FENCE_ARRAY_H
#define __LINUX_DMA_FENCE_ARRAY_H
 
#include <linux/dma-fence.h>
#include <linux/irq_work.h>
 
struct dma_fence_array_cb {
    struct dma_fence_cb cb;
    struct dma_fence_array *array;
};
 
struct dma_fence_array {
    struct dma_fence base;
 
    unsigned num_fences;
    atomic_t num_pending;
    struct dma_fence **fences;
 
    struct irq_work work;
 
    struct dma_fence_array_cb callbacks[] __counted_by(num_fences);
};
 
static inline struct dma_fence_array *
to_dma_fence_array(struct dma_fence *fence)
{
    if (!fence || !dma_fence_is_array(fence))
        return NULL;
 
    return container_of(fence, struct dma_fence_array, base);
}
 
#define dma_fence_array_for_each(fence, index, head)            \
    for (index = 0, fence = dma_fence_array_first(head); fence; \
         ++(index), fence = dma_fence_array_next(head, index))
 
struct dma_fence_array *dma_fence_array_alloc(int num_fences);
void dma_fence_array_init(struct dma_fence_array *array,
              int num_fences, struct dma_fence **fences,
              u64 context, unsigned seqno);
 
struct dma_fence_array *dma_fence_array_create(int num_fences,
                           struct dma_fence **fences,
                           u64 context, unsigned seqno);
 
bool dma_fence_match_context(struct dma_fence *fence, u64 context);
 
struct dma_fence *dma_fence_array_first(struct dma_fence *head);
struct dma_fence *dma_fence_array_next(struct dma_fence *head,
                       unsigned int index);
 
#endif /* __LINUX_DMA_FENCE_ARRAY_H */