[PATCH 1/3] dma-buf: add dma_fence_array_for_each (v2)

[Daniel Vetter]

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 at 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 at 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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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch