Commit caaf2ae7 authored by Christian König's avatar Christian König Committed by Christian König
Browse files

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.

Signed-off-by: default avatarJason Ekstrand <jason@jlekstrand.net>
Reviewed-by: default avatarJason Ekstrand <jason@jlekstrand.net>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210610210925.642582-2-jason@jlekstrand.net


Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
parent 7344bad7

drivers/dma-buf/dma-fence-array.c

+27 −0
Original line number Diff line number Diff line
@@ -219,3 +219,30 @@ bool dma_fence_match_context(struct dma_fence *fence, u64 context) 
	return true;

}

EXPORT_SYMBOL(dma_fence_match_context);



struct dma_fence *dma_fence_array_first(struct dma_fence *head)

{

	struct dma_fence_array *array;



	if (!head)

		return NULL;



	array = to_dma_fence_array(head);

	if (!array)

		return head;



	return array->fences[0];

}

EXPORT_SYMBOL(dma_fence_array_first);



struct dma_fence *dma_fence_array_next(struct dma_fence *head,

				       unsigned int index)

{

	struct dma_fence_array *array = to_dma_fence_array(head);



	if (!array || index >= array->num_fences)

		return NULL;



	return array->fences[index];

}

EXPORT_SYMBOL(dma_fence_array_next);

include/linux/dma-fence-array.h

+17 −0
Original line number Diff line number Diff line
@@ -61,6 +61,19 @@ to_dma_fence_array(struct dma_fence *fence) 
	return container_of(fence, struct dma_fence_array, base);

}



/**

 * dma_fence_array_for_each - iterate over all fences in array

 * @fence: current fence

 * @index: index into the array

 * @head: potential dma_fence_array object

 *

 * 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.

 */

#define dma_fence_array_for_each(fence, index, head)			\

	for (index = 0, fence = dma_fence_array_first(head); fence;	\

	     ++(index), fence = dma_fence_array_next(head, index))



struct dma_fence_array *dma_fence_array_create(int num_fences,

					       struct dma_fence **fences,

					       u64 context, unsigned seqno,
@@ -68,4 +81,8 @@ struct dma_fence_array *dma_fence_array_create(int num_fences, 


bool dma_fence_match_context(struct dma_fence *fence, u64 context);



struct dma_fence *dma_fence_array_first(struct dma_fence *head);

struct dma_fence *dma_fence_array_next(struct dma_fence *head,

				       unsigned int index);



#endif /* __LINUX_DMA_FENCE_ARRAY_H */