sna: Retain the GTT space used for an upload buffer

In order to retain the GTT space without keeping hold of the memory used
for the upload buffer, we have to create a new bo and copy the relevant
details across.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 15 insertions, 1 deletions

diff --git a/src/sna/kgem.c b/src/sna/kgem.c
index ef829fe8..947fac4e 100644
--- a/src/sna/kgem.c
+++ b/src/sna/kgem.c
@@ -701,15 +701,29 @@ static void kgem_finish_partials(struct kgem *kgem)
 			continue;
 		}
 
+		list_del(&bo->base.list);
+
 		if (bo->write && bo->need_io) {
 			DBG(("%s: handle=%d, uploading %d/%d\n",
 			     __FUNCTION__, bo->base.handle, bo->used, bo->alloc));
 			gem_write(kgem->fd, bo->base.handle,
 				  0, bo->used, bo+1);
 			bo->need_io = 0;
+
+			/* transfer the handle to a minimum bo */
+			if (bo->base.refcnt == 1) {
+				struct kgem_bo *base = malloc(sizeof(*base));
+				if (base) {
+					memcpy(base, &bo->base, sizeof (*base));
+					list_init(&base->list);
+					list_replace(&bo->base.request,
+						     &base->request);
+					free(bo);
+					bo = (struct kgem_partial_bo *)base;
+				}
+			}
 		}
 
-		list_del(&bo->base.list);
 		kgem_bo_unref(kgem, &bo->base);
 	}
 }