[PATCH 2/9] drm/syncobj: add new drm_syncobj_add_point interface v4

[Chunming Zhou]

From: Christian König <ckoenig.leichtzumerken at gmail.com>

Use the dma_fence_chain object to create a timeline of fence objects
instead of just replacing the existing fence.

v2: rebase and cleanup
v3: fix garbage collection parameters
v4: add unorder point check, print a warn calltrace

Signed-off-by: Christian König <christian.koenig at amd.com>
Cc: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
---
 drivers/gpu/drm/drm_syncobj.c | 39 +++++++++++++++++++++++++++++++++++
 include/drm/drm_syncobj.h     |  5 +++++
 2 files changed, 44 insertions(+)

diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index 5329e66598c6..19a9ce638119 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -122,6 +122,45 @@ static void drm_syncobj_remove_wait(struct drm_syncobj *syncobj,
 	spin_unlock(&syncobj->lock);
 }
 
+/**
+ * drm_syncobj_add_point - add new timeline point to the syncobj
+ * @syncobj: sync object to add timeline point do
+ * @chain: chain node to use to add the point
+ * @fence: fence to encapsulate in the chain node
+ * @point: sequence number to use for the point
+ *
+ * Add the chain node as new timeline point to the syncobj.
+ */
+void drm_syncobj_add_point(struct drm_syncobj *syncobj,
+			   struct dma_fence_chain *chain,
+			   struct dma_fence *fence,
+			   uint64_t point)
+{
+	struct syncobj_wait_entry *cur, *tmp;
+	struct dma_fence *prev;
+
+	dma_fence_get(fence);
+
+	spin_lock(&syncobj->lock);
+
+	prev = drm_syncobj_fence_get(syncobj);
+	/* You are adding an unorder point to timeline, which could cause payload returned from query_ioctl is 0! */
+	WARN_ON_ONCE(prev && prev->seqno >= point);
+	dma_fence_chain_init(chain, prev, fence, point);
+	rcu_assign_pointer(syncobj->fence, &chain->base);
+
+	list_for_each_entry_safe(cur, tmp, &syncobj->cb_list, node) {
+		list_del_init(&cur->node);
+		syncobj_wait_syncobj_func(syncobj, cur);
+	}
+	spin_unlock(&syncobj->lock);
+
+	/* Walk the chain once to trigger garbage collection */
+	dma_fence_chain_for_each(fence, prev);
+	dma_fence_put(prev);
+}
+EXPORT_SYMBOL(drm_syncobj_add_point);
+
 /**
  * drm_syncobj_replace_fence - replace fence in a sync object.
  * @syncobj: Sync object to replace fence in
diff --git a/include/drm/drm_syncobj.h b/include/drm/drm_syncobj.h
index 0311c9fdbd2f..6cf7243a1dc5 100644
--- a/include/drm/drm_syncobj.h
+++ b/include/drm/drm_syncobj.h
@@ -27,6 +27,7 @@
 #define __DRM_SYNCOBJ_H__
 
 #include <linux/dma-fence.h>
+#include <linux/dma-fence-chain.h>
 
 struct drm_file;
 
@@ -112,6 +113,10 @@ drm_syncobj_fence_get(struct drm_syncobj *syncobj)
 
 struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,
 				     u32 handle);
+void drm_syncobj_add_point(struct drm_syncobj *syncobj,
+			   struct dma_fence_chain *chain,
+			   struct dma_fence *fence,
+			   uint64_t point);
 void drm_syncobj_replace_fence(struct drm_syncobj *syncobj,
 			       struct dma_fence *fence);
 int drm_syncobj_find_fence(struct drm_file *file_private,
-- 
2.17.1