On Thu, Mar 18, 2021 at 10:38:11AM +0100, Christian König wrote:
Am 17.03.21 um 23:19 schrieb Jason Ekstrand:
From: Christian König ckoenig.leichtzumerken@gmail.com
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.
Is there any reason you send this patch alone out once more?
I don't see any changes compared to the last version.
Last patch has changed. Also I think mail delivery is a bit wobbly right now. -Daniel
Christian.
Signed-off-by: Jason Ekstrand jason@jlekstrand.net
drivers/dma-buf/dma-fence-array.c | 27 +++++++++++++++++++++++++++ include/linux/dma-fence-array.h | 17 +++++++++++++++++ 2 files changed, 44 insertions(+)
diff --git a/drivers/dma-buf/dma-fence-array.c b/drivers/dma-buf/dma-fence-array.c index d3fbd950be944..2ac1afc697d0f 100644 --- a/drivers/dma-buf/dma-fence-array.c +++ b/drivers/dma-buf/dma-fence-array.c @@ -201,3 +201,30 @@ 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); diff --git a/include/linux/dma-fence-array.h b/include/linux/dma-fence-array.h index 303dd712220fd..588ac8089dd61 100644 --- a/include/linux/dma-fence-array.h +++ b/include/linux/dma-fence-array.h @@ -74,6 +74,19 @@ 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,
@@ -81,4 +94,8 @@ 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 */
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