drm/amdgpu: recreate fence from user seq

And use common fence infrastructure for the wait.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -425,6 +425,8 @@ int amdgpu_fence_driver_start_ring(struct amdgpu_ring *ring,
 				   unsigned irq_type);
 int amdgpu_fence_emit(struct amdgpu_ring *ring, void *owner,
 		      struct amdgpu_fence **fence);
+int amdgpu_fence_recreate(struct amdgpu_ring *ring, void *owner,
+			  uint64_t seq, struct amdgpu_fence **fence);
 void amdgpu_fence_process(struct amdgpu_ring *ring);
 int amdgpu_fence_wait_next(struct amdgpu_ring *ring);
 int amdgpu_fence_wait_empty(struct amdgpu_ring *ring);
@@ -435,9 +437,6 @@ int amdgpu_fence_wait(struct amdgpu_fence *fence, bool interruptible);
 int amdgpu_fence_wait_any(struct amdgpu_device *adev,
 			  struct amdgpu_fence **fences,
 			  bool intr);
-long amdgpu_fence_wait_seq_timeout(struct amdgpu_device *adev,
-				   u64 *target_seq, bool intr,
-				   long timeout);
 struct amdgpu_fence *amdgpu_fence_ref(struct amdgpu_fence *fence);
 void amdgpu_fence_unref(struct amdgpu_fence **fence);
 

drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c

@@ -739,9 +739,9 @@ int amdgpu_cs_wait_ioctl(struct drm_device *dev, void *data,
 {
 	union drm_amdgpu_wait_cs *wait = data;
 	struct amdgpu_device *adev = dev->dev_private;
-	uint64_t seq[AMDGPU_MAX_RINGS] = {0};
-	struct amdgpu_ring *ring = NULL;
 	unsigned long timeout = amdgpu_gem_timeout(wait->in.timeout);
+	struct amdgpu_fence *fence = NULL;
+	struct amdgpu_ring *ring = NULL;
 	struct amdgpu_ctx *ctx;
 	long r;
 
@@ -754,9 +754,12 @@ int amdgpu_cs_wait_ioctl(struct drm_device *dev, void *data,
 	if (r)
 		return r;
 
-	seq[ring->idx] = wait->in.handle;
+	r = amdgpu_fence_recreate(ring, filp, wait->in.handle, &fence);
+	if (r)
+		return r;
 
-	r = amdgpu_fence_wait_seq_timeout(adev, seq, true, timeout);
+	r = fence_wait_timeout(&fence->base, true, timeout);
+	amdgpu_fence_unref(&fence);
 	amdgpu_ctx_put(ctx);
 	if (r < 0)
 		return r;

drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c

@@ -135,6 +135,38 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, void *owner,
 	return 0;
 }
 
+/**
+ * amdgpu_fence_recreate - recreate a fence from an user fence
+ *
+ * @ring: ring the fence is associated with
+ * @owner: creator of the fence
+ * @seq: user fence sequence number
+ * @fence: resulting amdgpu fence object
+ *
+ * Recreates a fence command from the user fence sequence number (all asics).
+ * Returns 0 on success, -ENOMEM on failure.
+ */
+int amdgpu_fence_recreate(struct amdgpu_ring *ring, void *owner,
+			  uint64_t seq, struct amdgpu_fence **fence)
+{
+	struct amdgpu_device *adev = ring->adev;
+
+	if (seq > ring->fence_drv.sync_seq[ring->idx])
+		return -EINVAL;
+
+	*fence = kmalloc(sizeof(struct amdgpu_fence), GFP_KERNEL);
+	if ((*fence) == NULL)
+		return -ENOMEM;
+
+	(*fence)->seq = seq;
+	(*fence)->ring = ring;
+	(*fence)->owner = owner;
+	fence_init(&(*fence)->base, &amdgpu_fence_ops,
+		&adev->fence_queue.lock, adev->fence_context + ring->idx,
+		(*fence)->seq);
+	return 0;
+}
+
 /**
  * amdgpu_fence_check_signaled - callback from fence_queue
  *
@@ -517,8 +549,9 @@ static bool amdgpu_fence_any_seq_signaled(struct amdgpu_device *adev, u64 *seq)
  * the wait timeout, or an error for all other cases.
  * -EDEADLK is returned when a GPU lockup has been detected.
  */
-long amdgpu_fence_wait_seq_timeout(struct amdgpu_device *adev, u64 *target_seq,
-				   bool intr, long timeout)
+static long amdgpu_fence_wait_seq_timeout(struct amdgpu_device *adev,
+					  u64 *target_seq, bool intr,
+					  long timeout)
 {
 	uint64_t last_seq[AMDGPU_MAX_RINGS];
 	bool signaled;