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      1 /*	$NetBSD: dma-fence-chain.h,v 1.4 2021/12/19 12:39:32 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2020 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #ifndef	_LINUX_DMA_FENCE_CHAIN_H_
     30 #define	_LINUX_DMA_FENCE_CHAIN_H_
     31 
     32 #include <sys/types.h>
     33 
     34 #include <linux/dma-fence.h>
     35 #include <linux/irq_work.h>
     36 
     37 struct dma_fence_chain {
     38 	/* Linux API */
     39 	struct dma_fence	base;
     40 	uint64_t		prev_seqno;
     41 
     42 	spinlock_t		dfc_lock;
     43 	struct dma_fence	*volatile dfc_prev;
     44 	struct dma_fence	*dfc_fence;
     45 	struct dma_fence_cb	dfc_callback;
     46 	struct irq_work		dfc_irq_work;
     47 };
     48 
     49 #define	dma_fence_chain_find_seqno	linux_dma_fence_chain_find_seqno
     50 #define	dma_fence_chain_init		linux_dma_fence_chain_init
     51 #define	dma_fence_chain_walk		linux_dma_fence_chain_walk
     52 #define	to_dma_fence_chain		linux_to_dma_fence_chain
     53 
     54 void	dma_fence_chain_init(struct dma_fence_chain *, struct dma_fence *,
     55 	    struct dma_fence *, uint64_t);
     56 int	dma_fence_chain_find_seqno(struct dma_fence **, uint64_t);
     57 struct dma_fence_chain *
     58 	to_dma_fence_chain(struct dma_fence *);
     59 struct dma_fence *
     60 	dma_fence_chain_walk(struct dma_fence *);
     61 
     62 #define	dma_fence_chain_for_each(VAR, FENCE)				      \
     63 	for ((VAR) = dma_fence_get(FENCE);				      \
     64 		(VAR) != NULL;						      \
     65 		(VAR) = dma_fence_chain_walk(VAR))
     66 
     67 #endif	/* _LINUX_DMA_FENCE_CHAIN_H_ */
     68