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/* $NetBSD: dma-fence-chain.h,v 1.4 2021/12/19 12:39:32 riastradh Exp $ */
/*-
* Copyright (c) 2020 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _LINUX_DMA_FENCE_CHAIN_H_
#define _LINUX_DMA_FENCE_CHAIN_H_
#include <sys/types.h>
#include <linux/dma-fence.h>
#include <linux/irq_work.h>
struct dma_fence_chain {
/* Linux API */
struct dma_fence base;
uint64_t prev_seqno;
spinlock_t dfc_lock;
struct dma_fence *volatile dfc_prev;
struct dma_fence *dfc_fence;
struct dma_fence_cb dfc_callback;
struct irq_work dfc_irq_work;
};
#define dma_fence_chain_find_seqno linux_dma_fence_chain_find_seqno
#define dma_fence_chain_init linux_dma_fence_chain_init
#define dma_fence_chain_walk linux_dma_fence_chain_walk
#define to_dma_fence_chain linux_to_dma_fence_chain
void dma_fence_chain_init(struct dma_fence_chain *, struct dma_fence *,
struct dma_fence *, uint64_t);
int dma_fence_chain_find_seqno(struct dma_fence **, uint64_t);
struct dma_fence_chain *
to_dma_fence_chain(struct dma_fence *);
struct dma_fence *
dma_fence_chain_walk(struct dma_fence *);
#define dma_fence_chain_for_each(VAR, FENCE) \
for ((VAR) = dma_fence_get(FENCE); \
(VAR) != NULL; \
(VAR) = dma_fence_chain_walk(VAR))
#endif /* _LINUX_DMA_FENCE_CHAIN_H_ */
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