Am 19.03.19 um 13:27 schrieb Lionel Landwerlin:
On 15/03/2019 12:09, Chunming Zhou wrote:
[SNIP]
+/**
+ * struct dma_fence_chain - fence to represent an node of a fence chain
+ * @base: fence base class
+ * @lock: spinlock for fence handling
+ * @prev: previous fence of the chain
+ * @prev_seqno: original previous seqno before garbage collection
+ * @fence: encapsulated fence
+ * @cb: callback structure for signaling
+ * @work: irq work item for signaling
+ */
+struct dma_fence_chain {
+ struct dma_fence base;
+ spinlock_t lock;
+ struct dma_fence *prev;
Not an expert on the rcu thing, but drm_syncobj has a __rcu on its
fence field.
Should this be? :
struct dma_fence __rcu *prev;
Yeah, the kbuild robot has already complained about this as well.
Needs to be fixed before pushed, but its only a minor change.
Christian.
+ u64 prev_seqno;
+ struct dma_fence *fence;
+ struct dma_fence_cb cb;
+ struct irq_work work;
+};
+
+extern const struct dma_fence_ops dma_fence_chain_ops;
+
+/**
+ * to_dma_fence_chain - cast a fence to a dma_fence_chain
+ * @fence: fence to cast to a dma_fence_array
+ *
+ * Returns NULL if the fence is not a dma_fence_chain,
+ * or the dma_fence_chain otherwise.
+ */
+static inline struct dma_fence_chain *
+to_dma_fence_chain(struct dma_fence *fence)
+{
+ if (!fence || fence->ops != &dma_fence_chain_ops)
+ return NULL;
+
+ return container_of(fence, struct dma_fence_chain, base);
+}
+
+/**
+ * dma_fence_chain_for_each - iterate over all fences in chain
+ * @iter: current fence
+ * @head: starting point
+ *
+ * Iterate over all fences in the chain. We keep a reference to the
current
+ * fence while inside the loop which must be dropped when breaking out.
+ */
+#define dma_fence_chain_for_each(iter, head) \
+ for (iter = dma_fence_get(head); iter; \
+ iter = dma_fence_chain_walk(iter))
+
+struct dma_fence *dma_fence_chain_walk(struct dma_fence *fence);
+int dma_fence_chain_find_seqno(struct dma_fence **pfence, uint64_t
seqno);
+void dma_fence_chain_init(struct dma_fence_chain *chain,
+ struct dma_fence *prev,
+ struct dma_fence *fence,
+ uint64_t seqno);
+
+#endif /* __LINUX_DMA_FENCE_CHAIN_H */
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