Re: [PATCH 1/4] dma-buf: add dma_fence_array_for_each (v2)

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Am 20.05.21 um 21:00 schrieb Jason Ekstrand:
From: Christian König <ckoenig.leichtzumerken@xxxxxxxxx>

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@xxxxxxxxxxxxxx>

Reviewed-by: Christian König <christian.koenig@xxxxxxx>

BTW: I'm only seeing this patch from the series. Looks like somehow the rest didn't made it into my inbox.

---
  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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