[PATCH 2/4] dma-buf: add reservation_object_copy_fences

[Christian König]

From: Christian König <christian.koenig at amd.com>

Allows us to copy all the fences in a reservation object to another one.

Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/dma-buf/reservation.c | 58 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/reservation.h   |  3 +++
 2 files changed, 61 insertions(+)

diff --git a/drivers/dma-buf/reservation.c b/drivers/dma-buf/reservation.c
index dfcd4ef3..302c137 100644
--- a/drivers/dma-buf/reservation.c
+++ b/drivers/dma-buf/reservation.c
@@ -262,6 +262,64 @@ void reservation_object_add_excl_fence(struct reservation_object *obj,
 EXPORT_SYMBOL(reservation_object_add_excl_fence);
 
 /**
+* reservation_object_copy_fences - Copy all fences from src to dst.
+* @dst: the destination reservation object
+* @src: the source reservation object
+*
+* Copy all fences from src to dst. Both src->lock as well as dst-lock must be
+* held.
+*/
+int reservation_object_copy_fences(struct reservation_object *dst,
+				   struct reservation_object *src)
+{
+	struct reservation_object_list *src_list, *dst_list;
+	struct dma_fence *old, *new;
+	size_t size;
+	unsigned i;
+
+	src_list = reservation_object_get_list(src);
+
+	/*
+	 * resize dst->fence or allocate if it doesn't exist,
+	 * noop if already correct size
+	 */
+	size = offsetof(typeof(*src_list), shared[src_list->shared_count]);
+	dst_list = kmalloc(size, GFP_KERNEL);
+	if (!dst_list)
+		return -ENOMEM;
+
+	kfree(dst->staged);
+	dst->staged = NULL;
+
+	dst_list->shared_count = src_list->shared_count;
+	dst_list->shared_max = src_list->shared_count;
+	for (i = 0; i < src_list->shared_count; ++i)
+		dst_list->shared[i] = dma_fence_get(src_list->shared[i]);
+
+	src_list = reservation_object_get_list(dst);
+
+	old = reservation_object_get_excl(dst);
+	new = reservation_object_get_excl(src);
+
+	dma_fence_get(new);
+
+	preempt_disable();
+	write_seqcount_begin(&dst->seq);
+	/* write_seqcount_begin provides the necessary memory barrier */
+	RCU_INIT_POINTER(dst->fence_excl, new);
+	RCU_INIT_POINTER(dst->fence, dst_list);
+	write_seqcount_end(&dst->seq);
+	preempt_enable();
+
+	if (src_list)
+		kfree_rcu(src_list, rcu);
+	dma_fence_put(old);
+
+	return 0;
+}
+EXPORT_SYMBOL(reservation_object_copy_fences);
+
+/**
  * reservation_object_get_fences_rcu - Get an object's shared and exclusive
  * fences without update side lock held
  * @obj: the reservation object
diff --git a/include/linux/reservation.h b/include/linux/reservation.h
index 2b5a467..cc4e9ec 100644
--- a/include/linux/reservation.h
+++ b/include/linux/reservation.h
@@ -234,6 +234,9 @@ int reservation_object_get_fences_rcu(struct reservation_object *obj,
 				      unsigned *pshared_count,
 				      struct dma_fence ***pshared);
 
+int reservation_object_copy_fences(struct reservation_object *dst,
+				   struct reservation_object *src);
+
 long reservation_object_wait_timeout_rcu(struct reservation_object *obj,
 					 bool wait_all, bool intr,
 					 unsigned long timeout);
-- 
2.7.4