drm/nouveau: fix multihop when move doesn't work.

As per the radeon/amdgpu fix don't use multihop if hw moves
aren't enabled.

Reported-by: Mike Galbraith <efault@gmx.de>
Tested-by: Mike Galbraith <efault@gmx.de>
Fixes: 0c8c0659d747 ("drm/nouveau/ttm: use multihop")
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20201217200943.30511-1-airlied@gmail.com

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 1386b0f..c85b1af 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -942,16 +942,6 @@ nouveau_bo_move(struct ttm_buffer_object *bo, bool evict,
        struct nouveau_drm_tile *new_tile = NULL;
        int ret = 0;
 
-       if ((old_reg->mem_type == TTM_PL_SYSTEM &&
-            new_reg->mem_type == TTM_PL_VRAM) ||
-           (old_reg->mem_type == TTM_PL_VRAM &&
-            new_reg->mem_type == TTM_PL_SYSTEM)) {
-               hop->fpfn = 0;
-               hop->lpfn = 0;
-               hop->mem_type = TTM_PL_TT;
-               hop->flags = 0;
-               return -EMULTIHOP;
-       }
 
        if (new_reg->mem_type == TTM_PL_TT) {
                ret = nouveau_ttm_tt_bind(bo->bdev, bo->ttm, new_reg);
@@ -995,14 +985,25 @@ nouveau_bo_move(struct ttm_buffer_object *bo, bool evict,
 
        /* Hardware assisted copy. */
        if (drm->ttm.move) {
+               if ((old_reg->mem_type == TTM_PL_SYSTEM &&
+                    new_reg->mem_type == TTM_PL_VRAM) ||
+                   (old_reg->mem_type == TTM_PL_VRAM &&
+                    new_reg->mem_type == TTM_PL_SYSTEM)) {
+                       hop->fpfn = 0;
+                       hop->lpfn = 0;
+                       hop->mem_type = TTM_PL_TT;
+                       hop->flags = 0;
+                       return -EMULTIHOP;
+               }
                ret = nouveau_bo_move_m2mf(bo, evict, ctx,
                                           new_reg);
-               if (!ret)
-                       goto out;
-       }
+       } else
+               ret = -ENODEV;
 
-       /* Fallback to software copy. */
-       ret = ttm_bo_move_memcpy(bo, ctx, new_reg);
+       if (ret) {
+               /* Fallback to software copy. */
+               ret = ttm_bo_move_memcpy(bo, ctx, new_reg);
+       }
 
 out:
        if (drm->client.device.info.family < NV_DEVICE_INFO_V0_TESLA) {