nvc0: create the SW object

It's required for being able to use software methods now.

src/gallium/drivers/nouveau/nvc0/nvc0_screen.c

@@ -361,6 +361,7 @@ nvc0_screen_destroy(struct pipe_screen *pscreen)
    nouveau_object_del(&screen->eng2d);
    nouveau_object_del(&screen->m2mf);
    nouveau_object_del(&screen->compute);
+   nouveau_object_del(&screen->nvsw);
 
    nouveau_screen_fini(&screen->base);
 
@@ -597,6 +598,14 @@ nvc0_screen_create(struct nouveau_device *dev)
    screen->base.fence.emit = nvc0_screen_fence_emit;
    screen->base.fence.update = nvc0_screen_fence_update;
 
+
+   ret = nouveau_object_new(chan,
+                            (dev->chipset < 0xe0) ? 0x1f906e : 0x906e, 0x906e,
+                            NULL, 0, &screen->nvsw);
+   if (ret)
+      FAIL_SCREEN_INIT("Error creating SW object: %d\n", ret);
+
+
    switch (dev->chipset & ~0xf) {
    case 0x100:
    case 0xf0:

src/gallium/drivers/nouveau/nvc0/nvc0_screen.h

@@ -76,6 +76,7 @@ struct nvc0_screen {
    struct nouveau_object *eng2d;
    struct nouveau_object *m2mf;
    struct nouveau_object *compute;
+   struct nouveau_object *nvsw;
 };
 
 static INLINE struct nvc0_screen *