dma-fence-chain.h

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * fence-chain: chain fences together in a timeline
 *
 * Copyright (C) 2018 Advanced Micro Devices, Inc.
 * Authors:
 *  Christian König <christian.koenig@amd.com>
 */
 
#ifndef __LINUX_DMA_FENCE_CHAIN_H
#define __LINUX_DMA_FENCE_CHAIN_H
 
#include <linux/dma-fence.h>
#include <linux/irq_work.h>
#include <linux/slab.h>
 
struct dma_fence_chain {
    struct dma_fence base;
    struct dma_fence __rcu *prev;
    u64 prev_seqno;
    struct dma_fence *fence;
    union {
        struct dma_fence_cb cb;
 
        struct irq_work work;
    };
};
 
 
static inline struct dma_fence_chain *
to_dma_fence_chain(struct dma_fence *fence)
{
    if (!fence || !dma_fence_is_chain(fence))
        return NULL;
 
    return container_of(fence, struct dma_fence_chain, base);
}
 
static inline struct dma_fence *
dma_fence_chain_contained(struct dma_fence *fence)
{
    struct dma_fence_chain *chain = to_dma_fence_chain(fence);
 
    return chain ? chain->fence : fence;
}
 
#define dma_fence_chain_alloc() \
        kmalloc_obj(struct dma_fence_chain)
 
static inline void dma_fence_chain_free(struct dma_fence_chain *chain)
{
    kfree(chain);
};
 
#define dma_fence_chain_for_each(iter, head)    \
    for (iter = dma_fence_get(head); iter; \
         iter = dma_fence_chain_walk(iter))
 
struct dma_fence *dma_fence_chain_walk(struct dma_fence *fence);
int dma_fence_chain_find_seqno(struct dma_fence **pfence, uint64_t seqno);
void dma_fence_chain_init(struct dma_fence_chain *chain,
              struct dma_fence *prev,
              struct dma_fence *fence,
              uint64_t seqno);
 
#endif /* __LINUX_DMA_FENCE_CHAIN_H */