drm/syncobj: add transition iotcls between binary and timeline v2

we need to import/export timeline point.

v2: unify to one transfer ioctl

Signed-off-by: Chunming Zhou <[e-mail]>
Signed-off-by: Christian König <[e-mail]>
Reviewed-by: Lionel Landwerlin <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/295790/?series=58813&rev=1

drivers/gpu/drm/drm_internal.h

···
 				   struct drm_file *file_private);
 int drm_syncobj_fd_to_handle_ioctl(struct drm_device *dev, void *data,
 				   struct drm_file *file_private);
+int drm_syncobj_transfer_ioctl(struct drm_device *dev, void *data,
+			       struct drm_file *file_private);
 int drm_syncobj_wait_ioctl(struct drm_device *dev, void *data,
 			   struct drm_file *file_private);
 int drm_syncobj_timeline_wait_ioctl(struct drm_device *dev, void *data,

drivers/gpu/drm/drm_ioctl.c

···
 		      DRM_UNLOCKED|DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl,
 		      DRM_UNLOCKED|DRM_RENDER_ALLOW),
+	DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TRANSFER, drm_syncobj_transfer_ioctl,
+		      DRM_UNLOCKED|DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl,
 		      DRM_UNLOCKED|DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT, drm_syncobj_timeline_wait_ioctl,

drivers/gpu/drm/drm_syncobj.c

···
 					&args->handle);
 }
 
+static int drm_syncobj_transfer_to_timeline(struct drm_file *file_private,
+					    struct drm_syncobj_transfer *args)
+{
+	struct drm_syncobj *timeline_syncobj = NULL;
+	struct dma_fence *fence;
+	struct dma_fence_chain *chain;
+	int ret;
+
+	timeline_syncobj = drm_syncobj_find(file_private, args->dst_handle);
+	if (!timeline_syncobj) {
+		return -ENOENT;
+	}
+	ret = drm_syncobj_find_fence(file_private, args->src_handle,
+				     args->src_point, args->flags,
+				     &fence);
+	if (ret)
+		goto err;
+	chain = kzalloc(sizeof(struct dma_fence_chain), GFP_KERNEL);
+	if (!chain) {
+		ret = -ENOMEM;
+		goto err1;
+	}
+	drm_syncobj_add_point(timeline_syncobj, chain, fence, args->dst_point);
+err1:
+	dma_fence_put(fence);
+err:
+	drm_syncobj_put(timeline_syncobj);
+
+	return ret;
+}
+
+static int
+drm_syncobj_transfer_to_binary(struct drm_file *file_private,
+			       struct drm_syncobj_transfer *args)
+{
+	struct drm_syncobj *binary_syncobj = NULL;
+	struct dma_fence *fence;
+	int ret;
+
+	binary_syncobj = drm_syncobj_find(file_private, args->dst_handle);
+	if (!binary_syncobj)
+		return -ENOENT;
+	ret = drm_syncobj_find_fence(file_private, args->src_handle,
+				     args->src_point, args->flags, &fence);
+	if (ret)
+		goto err;
+	drm_syncobj_replace_fence(binary_syncobj, fence);
+	dma_fence_put(fence);
+err:
+	drm_syncobj_put(binary_syncobj);
+
+	return ret;
+}
+int
+drm_syncobj_transfer_ioctl(struct drm_device *dev, void *data,
+			   struct drm_file *file_private)
+{
+	struct drm_syncobj_transfer *args = data;
+	int ret;
+
+	if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
+		return -ENODEV;
+
+	if (args->pad)
+		return -EINVAL;
+
+	if (args->dst_point)
+		ret = drm_syncobj_transfer_to_timeline(file_private, args);
+	else
+		ret = drm_syncobj_transfer_to_binary(file_private, args);
+
+	return ret;
+}
+
 static void syncobj_wait_fence_func(struct dma_fence *fence,
 				    struct dma_fence_cb *cb)
 {

include/uapi/drm/drm.h

···
 	__u32 pad;
 };
 
+struct drm_syncobj_transfer {
+	__u32 src_handle;
+	__u32 dst_handle;
+	__u64 src_point;
+	__u64 dst_point;
+	__u32 flags;
+	__u32 pad;
+};
+
 #define DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL (1 << 0)
 #define DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT (1 << 1)
 #define DRM_SYNCOBJ_WAIT_FLAGS_WAIT_AVAILABLE (1 << 2) /* wait for time point to become available */
···
 
 #define DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT	DRM_IOWR(0xCA, struct drm_syncobj_timeline_wait)
 #define DRM_IOCTL_SYNCOBJ_QUERY		DRM_IOWR(0xCB, struct drm_syncobj_timeline_array)
+#define DRM_IOCTL_SYNCOBJ_TRANSFER	DRM_IOWR(0xCC, struct drm_syncobj_transfer)
 
 /**
  * Device specific ioctls should only be in their respective headers