dma-buf: Add dma_fence_array_for_each (v2)

Add a helper to iterate over all fences in a dma_fence_array object. v2 (Jason Ekstrand) - Return NULL from dma_fence_array_first if head == NULL. This matches the iterator behavior of dma_fence_chain_for_each in that it iterates zero times if head == NULL. - Return NULL from dma_fence_array_next if index > array->num_fences.

Christian König committed 4 years ago

Commit caaf2ae1 parent 7344bad2 files · +44 −0Browse files

Showing the changes to include (1 of 2 files). Show all

Unified · Split

include/linux/dma-fence-array.h+17−0

@@ -61,6 +61,19 @@ to_dma_fence_array(struct dma_fence *fence) · 60 unmodified lines
61	return container_of(fence, struct dma_fence_array, base);	61	return container_of(fence, struct dma_fence_array, base);
62	}	62	}
63		63
		64	/**
		65	* dma_fence_array_for_each - iterate over all fences in array
		66	* @fence: current fence
		67	* @index: index into the array
		68	* @head: potential dma_fence_array object
		69	*
		70	* Test if @array is a dma_fence_array object and if yes iterate over all fences
		71	* in the array. If not just iterate over the fence in @array itself.
		72	*/
		73	#define dma_fence_array_for_each(fence, index, head) \
		74	for (index = 0, fence = dma_fence_array_first(head); fence; \
		75	++(index), fence = dma_fence_array_next(head, index))
		76
64	struct dma_fence_array *dma_fence_array_create(int num_fences,	77	struct dma_fence_array *dma_fence_array_create(int num_fences,
65	struct dma_fence **fences,	78	struct dma_fence **fences,
66	u64 context, unsigned seqno,	79	u64 context, unsigned seqno,
@@ -68,4 +81,8 @@ struct dma_fence_array *dma_fence_array_create(int num_fences, · 1 unmodified line
68		81
69	bool dma_fence_match_context(struct dma_fence *fence, u64 context);	82	bool dma_fence_match_context(struct dma_fence *fence, u64 context);
70		83
		84	struct dma_fence dma_fence_array_first(struct dma_fence head);
		85	struct dma_fence dma_fence_array_next(struct dma_fence head,
		86	unsigned int index);
		87
71	#endif /* __LINUX_DMA_FENCE_ARRAY_H */	88	#endif /* __LINUX_DMA_FENCE_ARRAY_H */