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4fa05a67b5
This reverts commit 8f61973718.
It turned out that this is not correct. Especially the sync_file info
IOCTL needs to see even signaled fences to correctly report back their
status to userspace.
Instead add the filter in the merge function again where it makes sense.
Signed-off-by: Christian König <christian.koenig@amd.com>
Tested-by: Karolina Drobnik <karolina.drobnik@intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220712102849.1562-1-christian.koenig@amd.com
76 lines
2.2 KiB
C
76 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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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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struct dma_fence;
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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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struct dma_fence *dma_fence_unwrap_first(struct dma_fence *head,
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struct dma_fence_unwrap *cursor);
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struct dma_fence *dma_fence_unwrap_next(struct dma_fence_unwrap *cursor);
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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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struct dma_fence *__dma_fence_unwrap_merge(unsigned int num_fences,
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struct dma_fence **fences,
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struct dma_fence_unwrap *cursors);
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/**
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* dma_fence_unwrap_merge - unwrap and merge fences
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*
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* All fences given as parameters are unwrapped and merged back together as flat
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* dma_fence_array. Useful if multiple containers need to be merged together.
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*
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* Implemented as a macro to allocate the necessary arrays on the stack and
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* account the stack frame size to the caller.
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*
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* Returns NULL on memory allocation failure, a dma_fence object representing
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* all the given fences otherwise.
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*/
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#define dma_fence_unwrap_merge(...) \
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({ \
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struct dma_fence *__f[] = { __VA_ARGS__ }; \
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struct dma_fence_unwrap __c[ARRAY_SIZE(__f)]; \
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\
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__dma_fence_unwrap_merge(ARRAY_SIZE(__f), __f, __c); \
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})
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#endif
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