96 lines
2.7 KiB
C
96 lines
2.7 KiB
C
/* 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) 2022 Advanced Micro Devices, Inc.
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* Authors:
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* Christian König <christian.koenig@amd.com>
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*/
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#ifndef __LINUX_DMA_FENCE_UNWRAP_H
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#define __LINUX_DMA_FENCE_UNWRAP_H
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#include <linux/dma-fence-chain.h>
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#include <linux/dma-fence-array.h>
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/**
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* struct dma_fence_unwrap - cursor into the container structure
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*
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* Should be used with dma_fence_unwrap_for_each() iterator macro.
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*/
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struct dma_fence_unwrap {
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/**
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* @chain: potential dma_fence_chain, but can be other fence as well
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*/
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struct dma_fence *chain;
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/**
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* @array: potential dma_fence_array, but can be other fence as well
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*/
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struct dma_fence *array;
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/**
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* @index: last returned index if @array is really a dma_fence_array
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*/
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unsigned int index;
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};
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/* Internal helper to start new array iteration, don't use directly */
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static inline struct dma_fence *
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__dma_fence_unwrap_array(struct dma_fence_unwrap * cursor)
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{
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cursor->array = dma_fence_chain_contained(cursor->chain);
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cursor->index = 0;
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return dma_fence_array_first(cursor->array);
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}
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/**
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* dma_fence_unwrap_first - return the first fence from fence containers
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* @head: the entrypoint into the containers
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* @cursor: current position inside the containers
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*
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* Unwraps potential dma_fence_chain/dma_fence_array containers and return the
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* first fence.
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*/
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static inline struct dma_fence *
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dma_fence_unwrap_first(struct dma_fence *head, struct dma_fence_unwrap *cursor)
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{
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cursor->chain = dma_fence_get(head);
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return __dma_fence_unwrap_array(cursor);
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}
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/**
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* dma_fence_unwrap_next - return the next fence from a fence containers
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* @cursor: current position inside the containers
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*
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* Continue unwrapping the dma_fence_chain/dma_fence_array containers and return
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* the next fence from them.
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*/
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static inline struct dma_fence *
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dma_fence_unwrap_next(struct dma_fence_unwrap *cursor)
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{
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struct dma_fence *tmp;
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++cursor->index;
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tmp = dma_fence_array_next(cursor->array, cursor->index);
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if (tmp)
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return tmp;
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cursor->chain = dma_fence_chain_walk(cursor->chain);
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return __dma_fence_unwrap_array(cursor);
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}
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/**
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* dma_fence_unwrap_for_each - iterate over all fences in containers
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* @fence: current fence
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* @cursor: current position inside the containers
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* @head: starting point for the iterator
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*
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* Unwrap dma_fence_chain and dma_fence_array containers and deep dive into all
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* potential fences in them. If @head is just a normal fence only that one is
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* returned.
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*/
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#define dma_fence_unwrap_for_each(fence, cursor, head) \
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for (fence = dma_fence_unwrap_first(head, cursor); fence; \
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fence = dma_fence_unwrap_next(cursor))
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#endif
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