From: Erik Gilling <konkers@xxxxxxxxxxx>
If the two fences being merged contain sync_pts from the same timeline,
those two pts will be collapsed into a single pt representing the latter
of the two.
Cc: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxx>
Cc: Erik Gilling <konkers@xxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Rob Clark <robclark@xxxxxxxxx>
Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
Cc: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: Android Kernel Team <kernel-team@xxxxxxxxxxx>
Signed-off-by: Erik Gilling <konkers@xxxxxxxxxxx>
[jstultz: Whitespace fixes]
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
---
drivers/staging/android/sync.c | 52 +++++++++++++++++++++++++++++++++++++++-
1 file changed, 51 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/android/sync.c b/drivers/staging/android/sync.c
index 2afbd69..6cb7c88 100644
--- a/drivers/staging/android/sync.c
+++ b/drivers/staging/android/sync.c
@@ -312,6 +312,56 @@ static int sync_fence_copy_pts(struct sync_fence *dst, struct sync_fence *src)
return 0;
}
+static int sync_fence_merge_pts(struct sync_fence *dst, struct sync_fence *src)
+{
+ struct list_head *src_pos, *dst_pos, *n;
+
+ list_for_each(src_pos, &src->pt_list_head) {
+ struct sync_pt *src_pt =
+ container_of(src_pos, struct sync_pt, pt_list);
+ bool collapsed = false;
+
+ list_for_each_safe(dst_pos, n, &dst->pt_list_head) {
+ struct sync_pt *dst_pt =
+ container_of(dst_pos, struct sync_pt, pt_list);
+ /* collapse two sync_pts on the same timeline
+ * to a single sync_pt that will signal at
+ * the later of the two
+ */
+ if (dst_pt->parent == src_pt->parent) {
+ if (dst_pt->parent->ops->compare(dst_pt, src_pt)
+ == -1) {
+ struct sync_pt *new_pt =
+ sync_pt_dup(src_pt);
+ if (new_pt == NULL)
+ return -ENOMEM;
+
+ new_pt->fence = dst;
+ list_replace(&dst_pt->pt_list,
+ &new_pt->pt_list);
+ sync_pt_activate(new_pt);
+ sync_pt_free(dst_pt);
+ }
+ collapsed = true;
+ break;
+ }
+ }
+
+ if (!collapsed) {
+ struct sync_pt *new_pt = sync_pt_dup(src_pt);
+
+ if (new_pt == NULL)
+ return -ENOMEM;
+
+ new_pt->fence = dst;
+ list_add(&new_pt->pt_list, &dst->pt_list_head);
+ sync_pt_activate(new_pt);
+ }
+ }
+
+ return 0;
+}
+
static void sync_fence_free_pts(struct sync_fence *fence)
{
struct list_head *pos, *n;
@@ -386,7 +436,7 @@ struct sync_fence *sync_fence_merge(const char *name,
if (err < 0)
goto err;
- err = sync_fence_copy_pts(fence, b);
+ err = sync_fence_merge_pts(fence, b);
if (err < 0)
goto err;
--
1.7.10.4
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