nvkm-y += nvkm/engine/disp/ovlynv50.o
 nvkm-y += nvkm/engine/disp/ovlyg84.o
 nvkm-y += nvkm/engine/disp/ovlygt200.o
-nvkm-y += nvkm/engine/disp/ovlygt215.o
 nvkm-y += nvkm/engine/disp/ovlygf119.o
 nvkm-y += nvkm/engine/disp/ovlygk104.o
 nvkm-y += nvkm/engine/disp/ovlygp102.o
 
 #include <core/object.h>
 #include "nv50.h"
 struct nv50_disp_root;
+struct nv50_disp_dmac_func;
 
 struct nv50_disp_chan {
        const struct nv50_disp_chan_func *func;
 
 extern const struct nvkm_event_func gf119_disp_chan_uevent;
 
+int nv50_disp_ovly_new_(const struct nv50_disp_dmac_func *,
+                       const struct nv50_disp_chan_mthd *,
+                       struct nv50_disp *, int chid,
+                       const struct nvkm_oclass *, void *argv, u32 argc,
+                       struct nvkm_object **);
+
+int nv50_disp_ovly_new(const struct nvkm_oclass *, void *, u32,
+                      struct nv50_disp *, struct nvkm_object **);
+
+int g84_disp_ovly_new(const struct nvkm_oclass *, void *, u32,
+                     struct nv50_disp *, struct nvkm_object **);
+
+int gt200_disp_ovly_new(const struct nvkm_oclass *, void *, u32,
+                       struct nv50_disp *, struct nvkm_object **);
+
+int gf119_disp_ovly_new(const struct nvkm_oclass *, void *, u32,
+                       struct nv50_disp *, struct nvkm_object **);
+
+int gk104_disp_ovly_new(const struct nvkm_oclass *, void *, u32,
+                       struct nv50_disp *, struct nvkm_object **);
+
+int gp102_disp_ovly_new(const struct nvkm_oclass *, void *, u32,
+                       struct nv50_disp *, struct nvkm_object **);
+
 struct nv50_disp_mthd_list {
        u32 mthd;
        u32 addr;
 extern const struct nv50_disp_mthd_list g84_disp_core_mthd_dac;
 extern const struct nv50_disp_mthd_list g84_disp_core_mthd_head;
 extern const struct nv50_disp_chan_mthd g84_disp_base_chan_mthd;
-extern const struct nv50_disp_chan_mthd g84_disp_ovly_chan_mthd;
 
 extern const struct nv50_disp_chan_mthd g94_disp_core_chan_mthd;
 
 extern const struct nv50_disp_chan_mthd gf119_disp_base_chan_mthd;
 
 extern const struct nv50_disp_chan_mthd gk104_disp_core_chan_mthd;
-extern const struct nv50_disp_chan_mthd gk104_disp_ovly_chan_mthd;
+extern const struct nv50_disp_chan_mthd gk104_disp_ovly_mthd;
 
 struct nv50_disp_pioc_oclass {
        int (*ctor)(const struct nv50_disp_chan_func *,
 
                       struct nv50_disp_root *, int chid,
                       const struct nvkm_oclass *oclass, void *data, u32 size,
                       struct nvkm_object **);
-int nv50_disp_ovly_new(const struct nv50_disp_dmac_func *,
-                      const struct nv50_disp_chan_mthd *,
-                      struct nv50_disp_root *, int chid,
-                      const struct nvkm_oclass *oclass, void *data, u32 size,
-                      struct nvkm_object **);
 
 extern const struct nv50_disp_dmac_oclass nv50_disp_core_oclass;
 extern const struct nv50_disp_dmac_oclass nv50_disp_base_oclass;
-extern const struct nv50_disp_dmac_oclass nv50_disp_ovly_oclass;
 
 extern const struct nv50_disp_dmac_oclass g84_disp_core_oclass;
 extern const struct nv50_disp_dmac_oclass g84_disp_base_oclass;
-extern const struct nv50_disp_dmac_oclass g84_disp_ovly_oclass;
 
 extern const struct nv50_disp_dmac_oclass g94_disp_core_oclass;
 
 extern const struct nv50_disp_dmac_oclass gt200_disp_core_oclass;
 extern const struct nv50_disp_dmac_oclass gt200_disp_base_oclass;
-extern const struct nv50_disp_dmac_oclass gt200_disp_ovly_oclass;
 
 extern const struct nv50_disp_dmac_oclass gt215_disp_core_oclass;
 extern const struct nv50_disp_dmac_oclass gt215_disp_base_oclass;
-extern const struct nv50_disp_dmac_oclass gt215_disp_ovly_oclass;
 
 extern const struct nv50_disp_dmac_oclass gf119_disp_core_oclass;
 extern const struct nv50_disp_dmac_oclass gf119_disp_base_oclass;
-extern const struct nv50_disp_dmac_oclass gf119_disp_ovly_oclass;
 
 extern const struct nv50_disp_dmac_oclass gk104_disp_core_oclass;
 extern const struct nv50_disp_dmac_oclass gk104_disp_base_oclass;
-extern const struct nv50_disp_dmac_oclass gk104_disp_ovly_oclass;
 
 extern const struct nv50_disp_dmac_oclass gk110_disp_core_oclass;
 extern const struct nv50_disp_dmac_oclass gk110_disp_base_oclass;
 
 extern const struct nv50_disp_dmac_oclass gp102_disp_core_oclass;
 extern const struct nv50_disp_dmac_oclass gp102_disp_base_oclass;
-extern const struct nv50_disp_dmac_oclass gp102_disp_ovly_oclass;
 #endif
 
  * Authors: Ben Skeggs
  */
 #include "dmacnv50.h"
-#include "rootnv50.h"
-
-#include <nvif/class.h>
 
 static const struct nv50_disp_mthd_list
 g84_disp_ovly_mthd_base = {
        }
 };
 
-const struct nv50_disp_chan_mthd
-g84_disp_ovly_chan_mthd = {
+static const struct nv50_disp_chan_mthd
+g84_disp_ovly_mthd = {
        .name = "Overlay",
        .addr = 0x000540,
        .prev = 0x000004,
        }
 };
 
-const struct nv50_disp_dmac_oclass
-g84_disp_ovly_oclass = {
-       .base.oclass = G82_DISP_OVERLAY_CHANNEL_DMA,
-       .base.minver = 0,
-       .base.maxver = 0,
-       .ctor = nv50_disp_ovly_new,
-       .func = &nv50_disp_dmac_func,
-       .mthd = &g84_disp_ovly_chan_mthd,
-       .chid = 3,
-};
+int
+g84_disp_ovly_new(const struct nvkm_oclass *oclass, void *argv, u32 argc,
+                 struct nv50_disp *disp, struct nvkm_object **pobject)
+{
+       return nv50_disp_ovly_new_(&nv50_disp_dmac_func, &g84_disp_ovly_mthd,
+                                  disp, 3, oclass, argv, argc, pobject);
+}
 
  * Authors: Ben Skeggs
  */
 #include "dmacnv50.h"
-#include "rootnv50.h"
-
-#include <nvif/class.h>
 
 static const struct nv50_disp_mthd_list
 gf119_disp_ovly_mthd_base = {
 };
 
 static const struct nv50_disp_chan_mthd
-gf119_disp_ovly_chan_mthd = {
+gf119_disp_ovly_mthd = {
        .name = "Overlay",
        .addr = 0x001000,
        .prev = -0x020000,
        }
 };
 
-const struct nv50_disp_dmac_oclass
-gf119_disp_ovly_oclass = {
-       .base.oclass = GF110_DISP_OVERLAY_CONTROL_DMA,
-       .base.minver = 0,
-       .base.maxver = 0,
-       .ctor = nv50_disp_ovly_new,
-       .func = &gf119_disp_dmac_func,
-       .mthd = &gf119_disp_ovly_chan_mthd,
-       .chid = 5,
-};
+int
+gf119_disp_ovly_new(const struct nvkm_oclass *oclass, void *argv, u32 argc,
+                   struct nv50_disp *disp, struct nvkm_object **pobject)
+{
+       return nv50_disp_ovly_new_(&gf119_disp_dmac_func, &gf119_disp_ovly_mthd,
+                                  disp, 5, oclass, argv, argc, pobject);
+}
 
  * Authors: Ben Skeggs
  */
 #include "dmacnv50.h"
-#include "rootnv50.h"
-
-#include <nvif/class.h>
 
 static const struct nv50_disp_mthd_list
 gk104_disp_ovly_mthd_base = {
 };
 
 const struct nv50_disp_chan_mthd
-gk104_disp_ovly_chan_mthd = {
+gk104_disp_ovly_mthd = {
        .name = "Overlay",
        .addr = 0x001000,
        .prev = -0x020000,
        }
 };
 
-const struct nv50_disp_dmac_oclass
-gk104_disp_ovly_oclass = {
-       .base.oclass = GK104_DISP_OVERLAY_CONTROL_DMA,
-       .base.minver = 0,
-       .base.maxver = 0,
-       .ctor = nv50_disp_ovly_new,
-       .func = &gf119_disp_dmac_func,
-       .mthd = &gk104_disp_ovly_chan_mthd,
-       .chid = 5,
-};
+int
+gk104_disp_ovly_new(const struct nvkm_oclass *oclass, void *argv, u32 argc,
+                   struct nv50_disp *disp, struct nvkm_object **pobject)
+{
+       return nv50_disp_ovly_new_(&gf119_disp_dmac_func, &gk104_disp_ovly_mthd,
+                                  disp, 5, oclass, argv, argc, pobject);
+}
 
  * Authors: Ben Skeggs
  */
 #include "dmacnv50.h"
-#include "rootnv50.h"
 
-#include <nvif/class.h>
-
-const struct nv50_disp_dmac_oclass
-gp102_disp_ovly_oclass = {
-       .base.oclass = GK104_DISP_OVERLAY_CONTROL_DMA,
-       .base.minver = 0,
-       .base.maxver = 0,
-       .ctor = nv50_disp_ovly_new,
-       .func = &gp102_disp_dmac_func,
-       .mthd = &gk104_disp_ovly_chan_mthd,
-       .chid = 5,
-};
+int
+gp102_disp_ovly_new(const struct nvkm_oclass *oclass, void *argv, u32 argc,
+                   struct nv50_disp *disp, struct nvkm_object **pobject)
+{
+       return nv50_disp_ovly_new_(&gp102_disp_dmac_func, &gk104_disp_ovly_mthd,
+                                  disp, 5, oclass, argv, argc, pobject);
+}
 
  * Authors: Ben Skeggs
  */
 #include "dmacnv50.h"
-#include "rootnv50.h"
-
-#include <nvif/class.h>
 
 static const struct nv50_disp_mthd_list
 gt200_disp_ovly_mthd_base = {
 };
 
 static const struct nv50_disp_chan_mthd
-gt200_disp_ovly_chan_mthd = {
+gt200_disp_ovly_mthd = {
        .name = "Overlay",
        .addr = 0x000540,
        .prev = 0x000004,
        }
 };
 
-const struct nv50_disp_dmac_oclass
-gt200_disp_ovly_oclass = {
-       .base.oclass = GT200_DISP_OVERLAY_CHANNEL_DMA,
-       .base.minver = 0,
-       .base.maxver = 0,
-       .ctor = nv50_disp_ovly_new,
-       .func = &nv50_disp_dmac_func,
-       .mthd = >200_disp_ovly_chan_mthd,
-       .chid = 3,
-};
+int
+gt200_disp_ovly_new(const struct nvkm_oclass *oclass, void *argv, u32 argc,
+                   struct nv50_disp *disp, struct nvkm_object **pobject)
+{
+       return nv50_disp_ovly_new_(&nv50_disp_dmac_func, >200_disp_ovly_mthd,
+                                  disp, 3, oclass, argv, argc, pobject);
+}
 
+++ /dev/null
-/*
- * Copyright 2015 Red Hat Inc.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
- * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
- * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
- * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
- * OTHER DEALINGS IN THE SOFTWARE.
- *
- * Authors: Ben Skeggs <bskeggs@redhat.com>
- */
-#include "dmacnv50.h"
-#include "rootnv50.h"
-
-#include <nvif/class.h>
-
-const struct nv50_disp_dmac_oclass
-gt215_disp_ovly_oclass = {
-       .base.oclass = GT214_DISP_OVERLAY_CHANNEL_DMA,
-       .base.minver = 0,
-       .base.maxver = 0,
-       .ctor = nv50_disp_ovly_new,
-       .func = &nv50_disp_dmac_func,
-       .mthd = &g84_disp_ovly_chan_mthd,
-       .chid = 3,
-};
 
  */
 #include "dmacnv50.h"
 #include "head.h"
-#include "rootnv50.h"
 
 #include <core/client.h>
 
-#include <nvif/class.h>
 #include <nvif/cl507e.h>
 #include <nvif/unpack.h>
 
 int
-nv50_disp_ovly_new(const struct nv50_disp_dmac_func *func,
-                  const struct nv50_disp_chan_mthd *mthd,
-                  struct nv50_disp_root *root, int chid,
-                  const struct nvkm_oclass *oclass, void *data, u32 size,
-                  struct nvkm_object **pobject)
+nv50_disp_ovly_new_(const struct nv50_disp_dmac_func *func,
+                   const struct nv50_disp_chan_mthd *mthd,
+                   struct nv50_disp *disp, int chid,
+                   const struct nvkm_oclass *oclass, void *argv, u32 argc,
+                   struct nvkm_object **pobject)
 {
        union {
                struct nv50_disp_overlay_channel_dma_v0 v0;
-       } *args = data;
+       } *args = argv;
        struct nvkm_object *parent = oclass->parent;
-       struct nv50_disp *disp = root->disp;
        int head, ret = -ENOSYS;
        u64 push;
 
-       nvif_ioctl(parent, "create disp overlay channel dma size %d\n", size);
-       if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
+       nvif_ioctl(parent, "create disp overlay channel dma size %d\n", argc);
+       if (!(ret = nvif_unpack(ret, &argv, &argc, args->v0, 0, 0, false))) {
                nvif_ioctl(parent, "create disp overlay channel dma vers %d "
                                   "pushbuf %016llx head %d\n",
                           args->v0.version, args->v0.pushbuf, args->v0.head);
 };
 
 static const struct nv50_disp_chan_mthd
-nv50_disp_ovly_chan_mthd = {
+nv50_disp_ovly_mthd = {
        .name = "Overlay",
        .addr = 0x000540,
        .prev = 0x000004,
        }
 };
 
-const struct nv50_disp_dmac_oclass
-nv50_disp_ovly_oclass = {
-       .base.oclass = NV50_DISP_OVERLAY_CHANNEL_DMA,
-       .base.minver = 0,
-       .base.maxver = 0,
-       .ctor = nv50_disp_ovly_new,
-       .func = &nv50_disp_dmac_func,
-       .mthd = &nv50_disp_ovly_chan_mthd,
-       .chid = 3,
-};
+int
+nv50_disp_ovly_new(const struct nvkm_oclass *oclass, void *argv, u32 argc,
+                  struct nv50_disp *disp, struct nvkm_object **pobject)
+{
+       return nv50_disp_ovly_new_(&nv50_disp_dmac_func, &nv50_disp_ovly_mthd,
+                                  disp, 3, oclass, argv, argc, pobject);
+}
 
        .dmac = {
                &g84_disp_core_oclass,
                &g84_disp_base_oclass,
-               &g84_disp_ovly_oclass,
        },
        .pioc = {
                &g84_disp_oimm_oclass,
                &g84_disp_curs_oclass,
        },
+       .user = {
+               {{0,0,G82_DISP_OVERLAY_CHANNEL_DMA},  g84_disp_ovly_new },
+               {}
+       },
 };
 
 static int
 
        .dmac = {
                &g94_disp_core_oclass,
                >200_disp_base_oclass,
-               >200_disp_ovly_oclass,
        },
        .pioc = {
                &g84_disp_oimm_oclass,
                &g84_disp_curs_oclass,
        },
+       .user = {
+               {{0,0,GT200_DISP_OVERLAY_CHANNEL_DMA}, gt200_disp_ovly_new },
+               {}
+       },
 };
 
 static int
 
        .dmac = {
                &gf119_disp_core_oclass,
                &gf119_disp_base_oclass,
-               &gf119_disp_ovly_oclass,
        },
        .pioc = {
                &gf119_disp_oimm_oclass,
                &gf119_disp_curs_oclass,
        },
+       .user = {
+               {{0,0,GF110_DISP_OVERLAY_CONTROL_DMA}, gf119_disp_ovly_new },
+               {}
+       },
 };
 
 static int
 
        .dmac = {
                &gk104_disp_core_oclass,
                &gk104_disp_base_oclass,
-               &gk104_disp_ovly_oclass,
        },
        .pioc = {
                &gk104_disp_oimm_oclass,
                &gk104_disp_curs_oclass,
        },
+       .user = {
+               {{0,0,GK104_DISP_OVERLAY_CONTROL_DMA}, gk104_disp_ovly_new },
+               {}
+       },
 };
 
 static int
 
        .dmac = {
                &gk110_disp_core_oclass,
                &gk110_disp_base_oclass,
-               &gk104_disp_ovly_oclass,
        },
        .pioc = {
                &gk104_disp_oimm_oclass,
                &gk104_disp_curs_oclass,
        },
+       .user = {
+               {{0,0,GK104_DISP_OVERLAY_CONTROL_DMA}, gk104_disp_ovly_new },
+               {}
+       },
 };
 
 static int
 
        .dmac = {
                &gm107_disp_core_oclass,
                &gk110_disp_base_oclass,
-               &gk104_disp_ovly_oclass,
        },
        .pioc = {
                &gk104_disp_oimm_oclass,
                &gk104_disp_curs_oclass,
        },
+       .user = {
+               {{0,0,GK104_DISP_OVERLAY_CONTROL_DMA}, gk104_disp_ovly_new },
+               {}
+       },
 };
 
 static int
 
        .dmac = {
                &gm200_disp_core_oclass,
                &gk110_disp_base_oclass,
-               &gk104_disp_ovly_oclass,
        },
        .pioc = {
                &gk104_disp_oimm_oclass,
                &gk104_disp_curs_oclass,
        },
+       .user = {
+               {{0,0,GK104_DISP_OVERLAY_CONTROL_DMA}, gk104_disp_ovly_new },
+               {}
+       },
 };
 
 static int
 
        .dmac = {
                &gp100_disp_core_oclass,
                &gk110_disp_base_oclass,
-               &gk104_disp_ovly_oclass,
        },
        .pioc = {
                &gk104_disp_oimm_oclass,
                &gk104_disp_curs_oclass,
        },
+       .user = {
+               {{0,0,GK104_DISP_OVERLAY_CONTROL_DMA}, gk104_disp_ovly_new },
+               {}
+       },
 };
 
 static int
 
        .dmac = {
                &gp102_disp_core_oclass,
                &gp102_disp_base_oclass,
-               &gp102_disp_ovly_oclass,
        },
        .pioc = {
                &gp102_disp_oimm_oclass,
                &gp102_disp_curs_oclass,
        },
+       .user = {
+               {{0,0,GK104_DISP_OVERLAY_CONTROL_DMA}, gp102_disp_ovly_new },
+               {}
+       },
 };
 
 static int
 
        .dmac = {
                >200_disp_core_oclass,
                >200_disp_base_oclass,
-               >200_disp_ovly_oclass,
        },
        .pioc = {
                &g84_disp_oimm_oclass,
                &g84_disp_curs_oclass,
        },
+       .user = {
+               {{0,0,GT200_DISP_OVERLAY_CHANNEL_DMA}, gt200_disp_ovly_new },
+               {}
+       },
 };
 
 static int
 
        .dmac = {
                >215_disp_core_oclass,
                >215_disp_base_oclass,
-               >215_disp_ovly_oclass,
        },
        .pioc = {
                >215_disp_oimm_oclass,
                >215_disp_curs_oclass,
        },
+       .user = {
+               {{0,0,GT214_DISP_OVERLAY_CHANNEL_DMA},   g84_disp_ovly_new },
+               {}
+       },
 };
 
 static int
 
                            sclass->chid.user, oclass, data, size, pobject);
 }
 
+static int
+nv50_disp_root_child_new_(const struct nvkm_oclass *oclass,
+                         void *argv, u32 argc, struct nvkm_object **pobject)
+{
+       struct nv50_disp *disp = nv50_disp_root(oclass->parent)->disp;
+       const struct nv50_disp_user *user = oclass->priv;
+       return user->ctor(oclass, argv, argc, disp, pobject);
+}
+
 static int
 nv50_disp_root_child_get_(struct nvkm_object *object, int index,
                          struct nvkm_oclass *sclass)
                return 0;
        }
 
+       index -= ARRAY_SIZE(root->func->pioc);
+
+       if (root->func->user[index].ctor) {
+               sclass->base = root->func->user[index].base;
+               sclass->priv = root->func->user + index;
+               sclass->ctor = nv50_disp_root_child_new_;
+               return 0;
+       }
+
        return -EINVAL;
 }
 
        .dmac = {
                &nv50_disp_core_oclass,
                &nv50_disp_base_oclass,
-               &nv50_disp_ovly_oclass,
        },
        .pioc = {
                &nv50_disp_oimm_oclass,
                &nv50_disp_curs_oclass,
        },
+       .user = {
+               {{0,0,NV50_DISP_OVERLAY_CHANNEL_DMA}, nv50_disp_ovly_new },
+               {}
+       },
 };
 
 static int
 
 };
 
 struct nv50_disp_root_func {
-       const struct nv50_disp_dmac_oclass *dmac[3];
+       const struct nv50_disp_dmac_oclass *dmac[2];
        const struct nv50_disp_pioc_oclass *pioc[2];
+       struct nv50_disp_user {
+               struct nvkm_sclass base;
+               int (*ctor)(const struct nvkm_oclass *, void *argv, u32 argc,
+                           struct nv50_disp *, struct nvkm_object **);
+       } user[];
 };
 
 int  nv50_disp_root_new_(const struct nv50_disp_root_func *, struct nvkm_disp *,