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dma-buf: add dma_fence_unwrap v2

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Add a general purpose helper to deep dive into dma_fence_chain/dma_fence_array
structures and iterate over all the fences in them.

This is useful when we need to flatten out all fences in those structures.

v2: some selftests cleanup, improved function naming and documentation

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220311110244.1245-1-christian.koenig@amd.com
This commit is contained in:
Christian König 2022-03-11 10:27:53 +01:00
parent caaf2ae712
commit 64a8f92fd7
7 changed files with 368 additions and 0 deletions
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2
include/linux/dma-fence-array.h
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@ -69,6 +69,8 @@ to_dma_fence_array(struct dma_fence *fence)
*
* Test if @array is a dma_fence_array object and if yes iterate over all fences
* in the array. If not just iterate over the fence in @array itself.
*
* For a deep dive iterator see dma_fence_unwrap_for_each().
*/
#define dma_fence_array_for_each(fence, index, head) \
for (index = 0, fence = dma_fence_array_first(head); fence; \