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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2022 Advanced Micro Devices, Inc.
* Authors:
* Christian König <christian.koenig@amd.com>
*/
#ifndef __LINUX_DMA_FENCE_UNWRAP_H
#define __LINUX_DMA_FENCE_UNWRAP_H
struct dma_fence;
/**
* struct dma_fence_unwrap - cursor into the container structure
*
* Should be used with dma_fence_unwrap_for_each() iterator macro.
*/
struct dma_fence_unwrap {
/**
* @chain: potential dma_fence_chain, but can be other fence as well
*/
struct dma_fence *chain;
/**
* @array: potential dma_fence_array, but can be other fence as well
*/
struct dma_fence *array;
/**
* @index: last returned index if @array is really a dma_fence_array
*/
unsigned int index;
};
struct dma_fence *dma_fence_unwrap_first(struct dma_fence *head,
struct dma_fence_unwrap *cursor);
struct dma_fence *dma_fence_unwrap_next(struct dma_fence_unwrap *cursor);
/**
* dma_fence_unwrap_for_each - iterate over all fences in containers
* @fence: current fence
* @cursor: current position inside the containers
* @head: starting point for the iterator
*
* Unwrap dma_fence_chain and dma_fence_array containers and deep dive into all
* potential fences in them. If @head is just a normal fence only that one is
* returned.
*/
#define dma_fence_unwrap_for_each(fence, cursor, head) \
for (fence = dma_fence_unwrap_first(head, cursor); fence; \
fence = dma_fence_unwrap_next(cursor))
struct dma_fence *__dma_fence_unwrap_merge(unsigned int num_fences,
struct dma_fence **fences,
struct dma_fence_unwrap *cursors);
/**
* dma_fence_unwrap_merge - unwrap and merge fences
*
* All fences given as parameters are unwrapped and merged back together as flat
* dma_fence_array. Useful if multiple containers need to be merged together.
*
* Implemented as a macro to allocate the necessary arrays on the stack and
* account the stack frame size to the caller.
*
* Returns NULL on memory allocation failure, a dma_fence object representing
* all the given fences otherwise.
*/
#define dma_fence_unwrap_merge(...) \
({ \
struct dma_fence *__f[] = { __VA_ARGS__ }; \
struct dma_fence_unwrap __c[ARRAY_SIZE(__f)]; \
\
__dma_fence_unwrap_merge(ARRAY_SIZE(__f), __f, __c); \
})
#endif
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