3  * fence-chain: chain fences together in a timeline
10 #include <linux/dma-fence-chain.h>
12 static bool dma_fence_chain_enable_signaling(struct dma_fence *fence);
15  * dma_fence_chain_get_prev - use RCU to get a reference to the previous fence
18  * Use dma_fence_get_rcu_safe to get a reference to the previous fence of the
33  * @fence: current chain node
35  * Walk the chain to the next node. Returns the next fence or NULL if we are at
39 struct dma_fence *dma_fence_chain_walk(struct dma_fence *fence)  in dma_fence_chain_walk()  argument
44 	chain = to_dma_fence_chain(fence);  in dma_fence_chain_walk()
46 		dma_fence_put(fence);  in dma_fence_chain_walk()
54 			if (!dma_fence_is_signaled(prev_chain->fence))  in dma_fence_chain_walk()
74 	dma_fence_put(fence);  in dma_fence_chain_walk()
80  * dma_fence_chain_find_seqno - find fence chain node by seqno
84  * Advance the fence pointer to the chain node which will signal this sequence
87  * Returns EINVAL if the fence is not a chain node or the sequence number has
112 static const char *dma_fence_chain_get_driver_name(struct dma_fence *fence)  in dma_fence_chain_get_driver_name()  argument
117 static const char *dma_fence_chain_get_timeline_name(struct dma_fence *fence)  in dma_fence_chain_get_timeline_name()  argument
145 static bool dma_fence_chain_enable_signaling(struct dma_fence *fence)  in dma_fence_chain_enable_signaling()  argument
147 	struct dma_fence_chain *head = to_dma_fence_chain(fence);  in dma_fence_chain_enable_signaling()
150 	dma_fence_chain_for_each(fence, &head->base) {  in dma_fence_chain_enable_signaling()
151 		struct dma_fence *f = dma_fence_chain_contained(fence);  in dma_fence_chain_enable_signaling()
155 			dma_fence_put(fence);  in dma_fence_chain_enable_signaling()
164 static bool dma_fence_chain_signaled(struct dma_fence *fence)  in dma_fence_chain_signaled()  argument
166 	dma_fence_chain_for_each(fence, fence) {  in dma_fence_chain_signaled()
167 		struct dma_fence *f = dma_fence_chain_contained(fence);  in dma_fence_chain_signaled()
170 			dma_fence_put(fence);  in dma_fence_chain_signaled()
178 static void dma_fence_chain_release(struct dma_fence *fence)  in dma_fence_chain_release()  argument
180 	struct dma_fence_chain *chain = to_dma_fence_chain(fence);  in dma_fence_chain_release()
205 	dma_fence_put(chain->fence);  in dma_fence_chain_release()
206 	dma_fence_free(fence);  in dma_fence_chain_release()
210 static void dma_fence_chain_set_deadline(struct dma_fence *fence,  in dma_fence_chain_set_deadline()  argument
213 	dma_fence_chain_for_each(fence, fence) {  in dma_fence_chain_set_deadline()
214 		struct dma_fence *f = dma_fence_chain_contained(fence);  in dma_fence_chain_set_deadline()
232  * dma_fence_chain_init - initialize a fence chain
234  * @prev: the previous fence
235  * @fence: the current fence
236  * @seqno: the sequence number to use for the fence chain
239  * the existing chain of the previous fence.
243 			  struct dma_fence *fence,  in dma_fence_chain_init()  argument
251 	chain->fence = fence;  in dma_fence_chain_init()
270 	 * the prev fence and not through the contained fence.  in dma_fence_chain_init()
272 	 * The correct way of handling this is to flatten out the fence  in dma_fence_chain_init()
275 	WARN_ON(dma_fence_is_chain(fence));  in dma_fence_chain_init()