drm/nv98/ttm: add in a (disabled) crypto engine buffer copy method

Disabled for the moment until some performance issues are sorted out, code
committed as a reference point.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nouveau_bo.c

@@ -561,6 +561,24 @@ nvc0_bo_move_m2mf(struct nouveau_channel *chan, struct ttm_buffer_object *bo,
 	return 0;
 }
 
+static int
+nv98_bo_move_exec(struct nouveau_channel *chan, struct ttm_buffer_object *bo,
+		  struct ttm_mem_reg *old_mem, struct ttm_mem_reg *new_mem)
+{
+	struct nouveau_mem *node = old_mem->mm_node;
+	int ret = RING_SPACE(chan, 7);
+	if (ret == 0) {
+		BEGIN_NV04(chan, NvSubCopy, 0x0320, 6);
+		OUT_RING  (chan, upper_32_bits(node->vma[0].offset));
+		OUT_RING  (chan, lower_32_bits(node->vma[0].offset));
+		OUT_RING  (chan, upper_32_bits(node->vma[1].offset));
+		OUT_RING  (chan, lower_32_bits(node->vma[1].offset));
+		OUT_RING  (chan, 0x00000000 /* COPY */);
+		OUT_RING  (chan, new_mem->num_pages << PAGE_SHIFT);
+	}
+	return ret;
+}
+
 static int
 nv84_bo_move_exec(struct nouveau_channel *chan, struct ttm_buffer_object *bo,
 		  struct ttm_mem_reg *old_mem, struct ttm_mem_reg *new_mem)
@@ -842,7 +860,8 @@ nouveau_bo_move_init(struct nouveau_channel *chan)
 		{ "CRYPT", 0x74c1, nv84_bo_move_exec, nv50_bo_move_init },
 		{  "M2MF", 0x5039, nv50_bo_move_m2mf, nv50_bo_move_init },
 		{  "M2MF", 0x0039, nv04_bo_move_m2mf, nv04_bo_move_init },
-		{}
+		{},
+		{ "CRYPT", 0x88b4, nv98_bo_move_exec, nv50_bo_move_init },
 	}, *mthd = _methods;
 	const char *name = "CPU";
 	int ret;