[PATCH 8/8] drm: clean up syncobj->fence and cb

[Chunming Zhou]

syncobj fence and cb aren't need any more.
wait pt already contains sumission wait.

Signed-off-by: Chunming Zhou <david1.zhou at amd.com>
---
 drivers/gpu/drm/drm_syncobj.c | 69 -----------------------------------
 include/drm/drm_syncobj.h     | 56 +---------------------------
 2 files changed, 1 insertion(+), 124 deletions(-)

diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index 0be7dd0a0e7d..cd358cf3cbeb 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -123,61 +123,6 @@ struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,
 }
 EXPORT_SYMBOL(drm_syncobj_find);
 
-static void drm_syncobj_add_callback_locked(struct drm_syncobj *syncobj,
-					    struct drm_syncobj_cb *cb,
-					    drm_syncobj_func_t func)
-{
-	cb->func = func;
-	list_add_tail(&cb->node, &syncobj->cb_list);
-}
-
-static int drm_syncobj_fence_get_or_add_callback(struct drm_syncobj *syncobj,
-						 struct dma_fence **fence,
-						 struct drm_syncobj_cb *cb,
-						 drm_syncobj_func_t func)
-{
-	int ret;
-
-	*fence = drm_syncobj_fence_get(syncobj);
-	if (*fence)
-		return 1;
-
-	spin_lock(&syncobj->lock);
-	/* We've already tried once to get a fence and failed.  Now that we
-	 * have the lock, try one more time just to be sure we don't add a
-	 * callback when a fence has already been set.
-	 */
-	if (syncobj->fence) {
-		*fence = dma_fence_get(rcu_dereference_protected(syncobj->fence,
-								 lockdep_is_held(&syncobj->lock)));
-		ret = 1;
-	} else {
-		*fence = NULL;
-		drm_syncobj_add_callback_locked(syncobj, cb, func);
-		ret = 0;
-	}
-	spin_unlock(&syncobj->lock);
-
-	return ret;
-}
-
-void drm_syncobj_add_callback(struct drm_syncobj *syncobj,
-			      struct drm_syncobj_cb *cb,
-			      drm_syncobj_func_t func)
-{
-	spin_lock(&syncobj->lock);
-	drm_syncobj_add_callback_locked(syncobj, cb, func);
-	spin_unlock(&syncobj->lock);
-}
-
-void drm_syncobj_remove_callback(struct drm_syncobj *syncobj,
-				 struct drm_syncobj_cb *cb)
-{
-	spin_lock(&syncobj->lock);
-	list_del_init(&cb->node);
-	spin_unlock(&syncobj->lock);
-}
-
 static void drm_syncobj_timeline_signal_wait_pts(struct drm_syncobj *syncobj)
 {
 	struct rb_node *node = NULL;
@@ -621,7 +566,6 @@ int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
 		return -ENOMEM;
 
 	kref_init(&syncobj->refcount);
-	INIT_LIST_HEAD(&syncobj->cb_list);
 	spin_lock_init(&syncobj->lock);
 	if (flags & DRM_SYNCOBJ_CREATE_TYPE_TIMELINE) {
 		syncobj->type = DRM_SYNCOBJ_TYPE_TIMELINE;
@@ -986,7 +930,6 @@ struct syncobj_wait_entry {
 	struct task_struct *task;
 	struct dma_fence *fence;
 	struct dma_fence_cb fence_cb;
-	struct drm_syncobj_cb syncobj_cb;
 };
 
 static void syncobj_wait_fence_func(struct dma_fence *fence,
@@ -998,18 +941,6 @@ static void syncobj_wait_fence_func(struct dma_fence *fence,
 	wake_up_process(wait->task);
 }
 
-static void syncobj_wait_syncobj_func(struct drm_syncobj *syncobj,
-				      struct drm_syncobj_cb *cb)
-{
-	struct syncobj_wait_entry *wait =
-		container_of(cb, struct syncobj_wait_entry, syncobj_cb);
-
-	/* This happens inside the syncobj lock */
-	wait->fence = dma_fence_get(rcu_dereference_protected(syncobj->fence,
-							      lockdep_is_held(&syncobj->lock)));
-	wake_up_process(wait->task);
-}
-
 static signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
 						  uint32_t count,
 						  uint32_t flags,
diff --git a/include/drm/drm_syncobj.h b/include/drm/drm_syncobj.h
index ec098d4798b8..657c97dc25ec 100644
--- a/include/drm/drm_syncobj.h
+++ b/include/drm/drm_syncobj.h
@@ -69,19 +69,7 @@ struct drm_syncobj {
 	struct drm_syncobj_timeline syncobj_timeline;
 
 	/**
-	 * @fence:
-	 * NULL or a pointer to the fence bound to this object.
-	 *
-	 * This field should not be used directly. Use drm_syncobj_fence_get()
-	 * and drm_syncobj_replace_fence() instead.
-	 */
-	struct dma_fence __rcu *fence;
-	/**
-	 * @cb_list: List of callbacks to call when the &fence gets replaced.
-	 */
-	struct list_head cb_list;
-	/**
-	 * @lock: Protects &cb_list and write-locks &fence.
+	 * @lock: Protects timeline list and write-locks &fence.
 	 */
 	spinlock_t lock;
 	/**
@@ -90,25 +78,6 @@ struct drm_syncobj {
 	struct file *file;
 };
 
-typedef void (*drm_syncobj_func_t)(struct drm_syncobj *syncobj,
-				   struct drm_syncobj_cb *cb);
-
-/**
- * struct drm_syncobj_cb - callback for drm_syncobj_add_callback
- * @node: used by drm_syncob_add_callback to append this struct to
- *	  &drm_syncobj.cb_list
- * @func: drm_syncobj_func_t to call
- *
- * This struct will be initialized by drm_syncobj_add_callback, additional
- * data can be passed along by embedding drm_syncobj_cb in another struct.
- * The callback will get called the next time drm_syncobj_replace_fence is
- * called.
- */
-struct drm_syncobj_cb {
-	struct list_head node;
-	drm_syncobj_func_t func;
-};
-
 void drm_syncobj_free(struct kref *kref);
 
 /**
@@ -134,29 +103,6 @@ drm_syncobj_put(struct drm_syncobj *obj)
 	kref_put(&obj->refcount, drm_syncobj_free);
 }
 
-/**
- * drm_syncobj_fence_get - get a reference to a fence in a sync object
- * @syncobj: sync object.
- *
- * This acquires additional reference to &drm_syncobj.fence contained in @obj,
- * if not NULL. It is illegal to call this without already holding a reference.
- * No locks required.
- *
- * Returns:
- * Either the fence of @obj or NULL if there's none.
- */
-static inline struct dma_fence *
-drm_syncobj_fence_get(struct drm_syncobj *syncobj)
-{
-	struct dma_fence *fence;
-
-	rcu_read_lock();
-	fence = dma_fence_get_rcu_safe(&syncobj->fence);
-	rcu_read_unlock();
-
-	return fence;
-}
-
 struct drm_syncobj *drm_syncobj_find(struct drm_file *file_private,
 				     u32 handle);
 void drm_syncobj_replace_fence(struct drm_syncobj *syncobj, u64 point,
-- 
2.17.1