[PATCH 06/12] drm/syncobj: add drm_syncobj_transfer

[Julian Orth <ju.orth@gmail.com>]

This makes the logic from drm_syncobj_transfer_ioctl available to
callers that already have two drm_syncobj.

Signed-off-by: Julian Orth <ju.orth@gmail.com>
---
 drivers/gpu/drm/drm_syncobj.c | 36 +++++++++++++++++++++++++++++-------
 include/drm/drm_syncobj.h     |  3 +++
 2 files changed, 32 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index a746e787882d..8ccfbd972191 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -1031,13 +1031,9 @@ drm_syncobj_transfer_ioctl(struct drm_device *dev, void *data,
 		goto err_dst;
 	}
 
-	if (args->dst_point)
-		ret = drm_syncobj_transfer_to_timeline(src, args->src_point,
-						       dst, args->dst_point,
-						       args->flags);
-	else
-		ret = drm_syncobj_transfer_to_binary(src, args->src_point,
-						     dst, args->flags);
+	ret = drm_syncobj_transfer(src, args->src_point,
+				   dst, args->dst_point,
+				   args->flags);
 
 	drm_syncobj_put(dst);
 err_dst:
@@ -1046,6 +1042,32 @@ drm_syncobj_transfer_ioctl(struct drm_device *dev, void *data,
 	return ret;
 }
 
+/**
+ * drm_syncobj_transfer - transfer a fence between syncobjs
+ * @src: source syncobj
+ * @src_point: source point
+ * @dst: destination syncobj
+ * @dst_point: destination point
+ * @flags: DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT or 0
+ *
+ * Copies the fence at @src_point in @src to @dst_point in @dst.
+ *
+ * Returns 0 on success or a negative error value on failure.
+ */
+int drm_syncobj_transfer(struct drm_syncobj *src, u64 src_point,
+			 struct drm_syncobj *dst, u64 dst_point,
+			 u32 flags)
+{
+	if (dst_point)
+		return drm_syncobj_transfer_to_timeline(src, src_point,
+							dst, dst_point,
+							flags);
+	else
+		return drm_syncobj_transfer_to_binary(src, src_point,
+						      dst, flags);
+}
+EXPORT_SYMBOL(drm_syncobj_transfer);
+
 static void syncobj_wait_fence_func(struct dma_fence *fence,
 				    struct dma_fence_cb *cb)
 {
diff --git a/include/drm/drm_syncobj.h b/include/drm/drm_syncobj.h
index 85e7ca7f7896..ec8042d61466 100644
--- a/include/drm/drm_syncobj.h
+++ b/include/drm/drm_syncobj.h
@@ -136,6 +136,9 @@ signed long drm_syncobj_array_wait_timeout(struct drm_syncobj **syncobjs,
 					   ktime_t *deadline);
 int drm_syncobj_register_eventfd(struct drm_syncobj *syncobj,
 				 int ev_fd, u64 point, u32 flags);
+int drm_syncobj_transfer(struct drm_syncobj *src, u64 src_point,
+			 struct drm_syncobj *dst, u64 dst_point,
+			 u32 flags);
 void drm_syncobj_free(struct kref *kref);
 int drm_syncobj_create(struct drm_syncobj **out_syncobj, uint32_t flags,
 		       struct dma_fence *fence);

-- 
2.54.0