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73 lines
2.0 KiB
73 lines
2.0 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* fence-chain: chain fences together in a timeline |
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* |
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* Copyright (C) 2018 Advanced Micro Devices, Inc. |
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* Authors: |
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* Christian König <[email protected]> |
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*/ |
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#ifndef __LINUX_DMA_FENCE_CHAIN_H |
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#define __LINUX_DMA_FENCE_CHAIN_H |
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#include <linux/dma-fence.h> |
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#include <linux/irq_work.h> |
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/** |
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* struct dma_fence_chain - fence to represent an node of a fence chain |
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* @base: fence base class |
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* @lock: spinlock for fence handling |
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* @prev: previous fence of the chain |
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* @prev_seqno: original previous seqno before garbage collection |
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* @fence: encapsulated fence |
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* @cb: callback structure for signaling |
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* @work: irq work item for signaling |
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*/ |
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struct dma_fence_chain { |
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struct dma_fence base; |
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spinlock_t lock; |
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struct dma_fence __rcu *prev; |
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u64 prev_seqno; |
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struct dma_fence *fence; |
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struct dma_fence_cb cb; |
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struct irq_work work; |
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}; |
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extern const struct dma_fence_ops dma_fence_chain_ops; |
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/** |
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* to_dma_fence_chain - cast a fence to a dma_fence_chain |
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* @fence: fence to cast to a dma_fence_array |
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* |
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* Returns NULL if the fence is not a dma_fence_chain, |
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* or the dma_fence_chain otherwise. |
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*/ |
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static inline struct dma_fence_chain * |
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to_dma_fence_chain(struct dma_fence *fence) |
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{ |
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if (!fence || fence->ops != &dma_fence_chain_ops) |
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return NULL; |
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return container_of(fence, struct dma_fence_chain, base); |
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} |
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/** |
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* dma_fence_chain_for_each - iterate over all fences in chain |
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* @iter: current fence |
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* @head: starting point |
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* |
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* Iterate over all fences in the chain. We keep a reference to the current |
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* fence while inside the loop which must be dropped when breaking out. |
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*/ |
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#define dma_fence_chain_for_each(iter, head) \ |
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for (iter = dma_fence_get(head); iter; \ |
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iter = dma_fence_chain_walk(iter)) |
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struct dma_fence *dma_fence_chain_walk(struct dma_fence *fence); |
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int dma_fence_chain_find_seqno(struct dma_fence **pfence, uint64_t seqno); |
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void dma_fence_chain_init(struct dma_fence_chain *chain, |
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struct dma_fence *prev, |
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struct dma_fence *fence, |
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uint64_t seqno); |
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#endif /* __LINUX_DMA_FENCE_CHAIN_H */
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