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dma-buf: Add dma_fence_array_for_each (v2)

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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: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Christian 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: Christian König <christian.koenig@amd.com>
This commit is contained in:
Christian König 2022-01-24 14:03:24 +01:00 committed by Christian König
parent 7344bad7fb
commit caaf2ae712
2 changed files with 44 additions and 0 deletions
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27
drivers/dma-buf/dma-fence-array.c
View File

@ -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);

17
include/linux/dma-fence-array.h
View File

@ -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 */