drm/nouveau/dma: convert user classes to new-style nvkm_object

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

18 files changed, 362 insertions, 264 deletions

diff --git a/drivers/gpu/drm/nouveau/include/nvkm/core/client.h b/drivers/gpu/drm/nouveau/include/nvkm/core/client.h
index 4bb0acca8650..7ec1762a0ec1 100644
--- a/drivers/gpu/drm/nouveau/include/nvkm/core/client.h
+++ b/drivers/gpu/drm/nouveau/include/nvkm/core/client.h
@@ -10,6 +10,7 @@ struct nvkm_client {
 
 	struct nvkm_client_notify *notify[16];
 	struct rb_root objroot;
+	struct rb_root dmaroot;
 
 	struct nvkm_handle *root;
 
diff --git a/drivers/gpu/drm/nouveau/include/nvkm/engine/dma.h b/drivers/gpu/drm/nouveau/include/nvkm/engine/dma.h
index 5f461e95987e..7439a02bf7c9 100644
--- a/drivers/gpu/drm/nouveau/include/nvkm/engine/dma.h
+++ b/drivers/gpu/drm/nouveau/include/nvkm/engine/dma.h
@@ -1,24 +1,35 @@
 #ifndef __NVKM_DMA_H__
 #define __NVKM_DMA_H__
 #include <core/engine.h>
+struct nvkm_client;
 struct nvkm_gpuobj;
 
 struct nvkm_dmaobj {
-	struct nvkm_object base;
+	const struct nvkm_dmaobj_func *func;
+	struct nvkm_dma *dma;
+
+	struct nvkm_object object;
 	u32 target;
 	u32 access;
 	u64 start;
 	u64 limit;
+
+	struct rb_node rb;
+	u64 handle; /*XXX HANDLE MERGE */
+};
+
+struct nvkm_dmaobj_func {
+	int (*bind)(struct nvkm_dmaobj *, struct nvkm_gpuobj *, int align,
+		    struct nvkm_gpuobj **);
 };
 
 struct nvkm_dma {
 	struct nvkm_engine engine;
-
-	/* creates a "physical" dma object from a struct nvkm_dmaobj */
-	int (*bind)(struct nvkm_dmaobj *dmaobj, struct nvkm_gpuobj *parent,
-		    struct nvkm_gpuobj **);
 };
 
+struct nvkm_dmaobj *
+nvkm_dma_search(struct nvkm_dma *, struct nvkm_client *, u64 object);
+
 extern struct nvkm_oclass *nv04_dmaeng_oclass;
 extern struct nvkm_oclass *nv50_dmaeng_oclass;
 extern struct nvkm_oclass *gf100_dmaeng_oclass;
diff --git a/drivers/gpu/drm/nouveau/nvkm/core/client.c b/drivers/gpu/drm/nouveau/nvkm/core/client.c
index dce1d45cac5e..910f736cd1b6 100644
--- a/drivers/gpu/drm/nouveau/nvkm/core/client.c
+++ b/drivers/gpu/drm/nouveau/nvkm/core/client.c
@@ -314,6 +314,7 @@ nvkm_client_new(const char *name, u64 device, const char *cfg,
 	client->device = device;
 	client->debug = nvkm_dbgopt(dbg, "CLIENT");
 	client->objroot = RB_ROOT;
+	client->dmaroot = RB_ROOT;
 
 	ret = nvkm_handle_create(NULL, ~0, &client->object, &client->root);
 	if (ret)
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/device/user.c b/drivers/gpu/drm/nouveau/nvkm/engine/device/user.c
index 58a09f828b7f..39f31e2e281b 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/device/user.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/device/user.c
@@ -292,11 +292,12 @@ nvkm_udevice_child_get(struct nvkm_object *object, int index,
 		   (1ULL << NVDEV_ENGINE_FIFO) |
 		   (1ULL << NVDEV_ENGINE_DISP) |
 		   (1ULL << NVDEV_ENGINE_PM);
-	const struct nvkm_device_oclass *sclass;
+	const struct nvkm_device_oclass *sclass = NULL;
 	int i;
 
-	for (; i = __ffs64(mask), mask; mask &= ~(1ULL << i)) {
-		if ((engine = nvkm_device_engine(device, i))) {
+	for (; i = __ffs64(mask), mask && !sclass; mask &= ~(1ULL << i)) {
+		if ((engine = nvkm_device_engine(device, i)) &&
+		    !engine->func) {
 			struct nvkm_oclass *sclass = engine->sclass;
 			int c = 0;
 			while (sclass && sclass->ofuncs) {
@@ -312,17 +313,27 @@ nvkm_udevice_child_get(struct nvkm_object *object, int index,
 				sclass++;
 			}
 			index -= c;
+			continue;
 		}
+
+		if (!(engine = nvkm_device_engine(device, i)) ||
+		    !(engine->func->base.sclass))
+			continue;
+		oclass->engine = engine;
+
+		index -= engine->func->base.sclass(oclass, index, &sclass);
 	}
 
-	switch (index) {
-	case 0: sclass = &nvkm_control_oclass; break;
-	default:
-		return -EINVAL;
+	if (!sclass) {
+		switch (index) {
+		case 0: sclass = &nvkm_control_oclass; break;
+		default:
+			return -EINVAL;
+		}
+		oclass->base = sclass->base;
 	}
 
 	oclass->ctor = nvkm_udevice_child_new;
-	oclass->base = sclass->base;
 	oclass->priv = sclass;
 	return 0;
 }
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/nv50.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/nv50.c
index 12b835fee0d5..36241cf9173e 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/nv50.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/nv50.c
@@ -209,8 +209,9 @@ nv50_disp_dmac_create_(struct nvkm_object *parent,
 		       struct nvkm_oclass *oclass, u64 pushbuf, int head,
 		       int length, void **pobject)
 {
+	struct nvkm_device *device = parent->engine->subdev.device;
 	struct nvkm_client *client = nvkm_client(parent);
-	struct nvkm_handle *handle;
+	struct nvkm_dma *dma = device->dma;
 	struct nvkm_dmaobj *dmaobj;
 	struct nv50_disp_dmac *dmac;
 	int ret;
@@ -221,27 +222,19 @@ nv50_disp_dmac_create_(struct nvkm_object *parent,
 	if (ret)
 		return ret;
 
-	handle = nvkm_client_search(client, pushbuf);
-	if (!handle)
+	dmaobj = nvkm_dma_search(dma, client, pushbuf);
+	if (!dmaobj)
 		return -ENOENT;
-	dmaobj = (void *)handle->object;
 
-	switch (nv_mclass(dmaobj)) {
-	case 0x0002:
-	case 0x003d:
-		if (dmaobj->limit - dmaobj->start != 0xfff)
-			return -EINVAL;
+	if (dmaobj->limit - dmaobj->start != 0xfff)
+		return -EINVAL;
 
-		switch (dmaobj->target) {
-		case NV_MEM_TARGET_VRAM:
-			dmac->push = 0x00000001 | dmaobj->start >> 8;
-			break;
-		case NV_MEM_TARGET_PCI_NOSNOOP:
-			dmac->push = 0x00000003 | dmaobj->start >> 8;
-			break;
-		default:
-			return -EINVAL;
-		}
+	switch (dmaobj->target) {
+	case NV_MEM_TARGET_VRAM:
+		dmac->push = 0x00000001 | dmaobj->start >> 8;
+		break;
+	case NV_MEM_TARGET_PCI_NOSNOOP:
+		dmac->push = 0x00000003 | dmaobj->start >> 8;
 		break;
 	default:
 		return -EINVAL;
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/dma/base.c b/drivers/gpu/drm/nouveau/nvkm/engine/dma/base.c
index a48978d39843..57f6eca078ef 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/dma/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/dma/base.c
@@ -24,77 +24,182 @@
 #include "priv.h"
 
 #include <core/client.h>
-#include <core/gpuobj.h>
 
-struct hack {
-	struct nvkm_gpuobj object;
-	struct nvkm_gpuobj *parent;
+#include <nvif/class.h>
+
+struct nvkm_dmaobj *
+nvkm_dma_search(struct nvkm_dma *dma, struct nvkm_client *client, u64 object)
+{
+	struct rb_node *node = client->dmaroot.rb_node;
+	while (node) {
+		struct nvkm_dmaobj *dmaobj =
+			container_of(node, typeof(*dmaobj), rb);
+		if (object < dmaobj->handle)
+			node = node->rb_left;
+		else
+		if (object > dmaobj->handle)
+			node = node->rb_right;
+		else
+			return dmaobj;
+	}
+	return NULL;
+}
+
+static int
+nvkm_dma_oclass_new(struct nvkm_device *device,
+		    const struct nvkm_oclass *oclass, void *data, u32 size,
+		    struct nvkm_object **pobject)
+{
+	struct nvkm_dma *dma = nvkm_dma(oclass->engine);
+	struct nvkm_dma_impl *impl = (void *)dma->engine.subdev.object.oclass;
+	struct nvkm_dmaobj *dmaobj = NULL;
+	struct nvkm_client *client = oclass->client;
+	struct rb_node **ptr = &client->dmaroot.rb_node;
+	struct rb_node *parent = NULL;
+	int ret;
+
+	ret = impl->class_new(dma, oclass, data, size, &dmaobj);
+	if (dmaobj)
+		*pobject = &dmaobj->object;
+	if (ret)
+		return ret;
+
+	dmaobj->handle = oclass->object;
+
+	while (*ptr) {
+		struct nvkm_dmaobj *obj = container_of(*ptr, typeof(*obj), rb);
+		parent = *ptr;
+		if (dmaobj->handle < obj->handle)
+			ptr = &parent->rb_left;
+		else
+		if (dmaobj->handle > obj->handle)
+			ptr = &parent->rb_right;
+		else
+			return -EEXIST;
+	}
+
+	rb_link_node(&dmaobj->rb, parent, ptr);
+	rb_insert_color(&dmaobj->rb, &client->dmaroot);
+	return 0;
+}
+
+static const struct nvkm_device_oclass
+nvkm_dma_oclass_base = {
+	.ctor = nvkm_dma_oclass_new,
 };
 
-static void
-dtor(struct nvkm_object *object)
+static const struct nvkm_sclass
+nvkm_dma_sclass[] = {
+	{ 0, 0, NV_DMA_FROM_MEMORY },
+	{ 0, 0, NV_DMA_TO_MEMORY },
+	{ 0, 0, NV_DMA_IN_MEMORY },
+};
+
+static int
+nvkm_dma_oclass_base_get(struct nvkm_oclass *sclass, int index,
+			 const struct nvkm_device_oclass **class)
 {
-	struct hack *hack = (void *)object;
-	nvkm_gpuobj_del(&hack->parent);
-	nvkm_object_destroy(&hack->object.object);
+	const int count = ARRAY_SIZE(nvkm_dma_sclass);
+	if (index < count) {
+		const struct nvkm_sclass *oclass = &nvkm_dma_sclass[index];
+		sclass->base = oclass[0];
+		sclass->engn = oclass;
+		*class = &nvkm_dma_oclass_base;
+		return index;
+	}
+	return count;
 }
 
-static struct nvkm_oclass
-hack = {
-	.handle = NV_GPUOBJ_CLASS,
+static const struct nvkm_engine_func
+nvkm_dma = {
+	.base.sclass = nvkm_dma_oclass_base_get,
+};
+
+#include <core/gpuobj.h>
+
+static struct nvkm_oclass empty = {
 	.ofuncs = &(struct nvkm_ofuncs) {
-		.dtor = dtor,
+		.dtor = nvkm_object_destroy,
 		.init = _nvkm_object_init,
 		.fini = _nvkm_object_fini,
 	},
 };
 
 static int
-nvkm_dmaobj_bind(struct nvkm_dmaobj *dmaobj, struct nvkm_gpuobj *pargpu,
-		 struct nvkm_gpuobj **pgpuobj)
+nvkm_dmaobj_compat_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
+			struct nvkm_oclass *oclass, void *data, u32 size,
+			struct nvkm_object **pobject)
 {
-	const struct nvkm_dma_impl *impl = (void *)
-		nv_oclass(nv_object(dmaobj)->engine);
-	int ret = 0;
+	struct nvkm_oclass hack = {
+		.base.oclass = oclass->handle,
+		.client = nvkm_client(parent),
+		.parent = parent,
+		.engine = nv_engine(engine),
+	};
+	struct nvkm_dma *dma = (void *)engine;
+	struct nvkm_dma_impl *impl = (void *)dma->engine.subdev.object.oclass;
+	struct nvkm_dmaobj *dmaobj = NULL;
+	struct nvkm_gpuobj *gpuobj;
+	int ret;
 
-	if (&dmaobj->base == &pargpu->object) { /* ctor bind */
-		struct nvkm_object *parent = (void *)pargpu;
-		struct hack *object;
+	ret = impl->class_new(dma, &hack, data, size, &dmaobj);
+	if (dmaobj)
+		*pobject = &dmaobj->object;
+	if (ret)
+		return ret;
 
-		if (parent->parent->parent == &nvkm_client(parent)->object) {
-			/* delayed, or no, binding */
-			return 0;
-		}
+	gpuobj = (void *)nv_pclass(parent, NV_GPUOBJ_CLASS);
 
-		pargpu = (void *)nv_pclass((void *)pargpu, NV_GPUOBJ_CLASS);
+	ret = dmaobj->func->bind(dmaobj, gpuobj, 16, &gpuobj);
+	nvkm_object_ref(NULL, pobject);
+	if (ret)
+		return ret;
 
-		ret = nvkm_object_create(parent, NULL, &hack, NV_GPUOBJ_CLASS, &object);
-		if (ret == 0) {
-			nvkm_object_ref(NULL, &parent);
-			*pgpuobj = &object->object;
+	ret = nvkm_object_create(parent, engine, &empty, 0, pobject);
+	if (ret)
+		return ret;
 
-			ret = impl->bind(dmaobj, pargpu, &object->parent);
-			if (ret)
-				return ret;
+	gpuobj->object.parent = *pobject;
+	gpuobj->object.engine = &dma->engine;
+	gpuobj->object.oclass = oclass;
+	gpuobj->object.pclass = NV_GPUOBJ_CLASS;
+#if CONFIG_NOUVEAU_DEBUG >= NV_DBG_PARANOIA
+	gpuobj->object._magic = NVKM_OBJECT_MAGIC;
+#endif
+	*pobject = &gpuobj->object;
+	return 0;
+}
 
-			object->object.node = object->parent->node;
-			object->object.addr = object->parent->addr;
-			object->object.size = object->parent->size;
-			return 0;
-		}
+static void
+nvkm_dmaobj_compat_dtor(struct nvkm_object *object)
+{
+	struct nvkm_object *parent = object->parent;
+	struct nvkm_gpuobj *gpuobj = (void *)object;
+	nvkm_gpuobj_del(&gpuobj);
+	nvkm_object_ref(NULL, &parent);
+}
 
-		return ret;
-	}
+static struct nvkm_ofuncs
+nvkm_dmaobj_compat_ofuncs = {
+	.ctor = nvkm_dmaobj_compat_ctor,
+	.dtor = nvkm_dmaobj_compat_dtor,
+	.init = _nvkm_object_init,
+	.fini = _nvkm_object_fini,
+};
 
-	return impl->bind(dmaobj, pargpu, pgpuobj);
-}
+static struct nvkm_oclass
+nvkm_dma_compat_sclass[] = {
+	{ NV_DMA_FROM_MEMORY, &nvkm_dmaobj_compat_ofuncs },
+	{ NV_DMA_TO_MEMORY, &nvkm_dmaobj_compat_ofuncs },
+	{ NV_DMA_IN_MEMORY, &nvkm_dmaobj_compat_ofuncs },
+	{}
+};
 
 int
 _nvkm_dma_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
 		  struct nvkm_oclass *oclass, void *data, u32 size,
 		  struct nvkm_object **pobject)
 {
-	const struct nvkm_dma_impl *impl = (void *)oclass;
 	struct nvkm_dma *dmaeng;
 	int ret;
 
@@ -104,7 +209,7 @@ _nvkm_dma_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
 	if (ret)
 		return ret;
 
-	nv_engine(dmaeng)->sclass = impl->sclass;
-	dmaeng->bind = nvkm_dmaobj_bind;
+	dmaeng->engine.sclass = nvkm_dma_compat_sclass;
+	dmaeng->engine.func = &nvkm_dma;
 	return 0;
 }
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/dma/gf100.c b/drivers/gpu/drm/nouveau/nvkm/engine/dma/gf100.c
index cb5c6adb8048..81badf09eed8 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/dma/gf100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/dma/gf100.c
@@ -33,6 +33,5 @@ gf100_dmaeng_oclass = &(struct nvkm_dma_impl) {
 		.init = _nvkm_dma_init,
 		.fini = _nvkm_dma_fini,
 	},
-	.sclass = gf100_dmaeng_sclass,
-	.bind = gf100_dmaobj_bind,
+	.class_new = gf100_dmaobj_new,
 }.base;
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/dma/gf110.c b/drivers/gpu/drm/nouveau/nvkm/engine/dma/gf110.c
index 9a93ec6924f9..79d869bf9a61 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/dma/gf110.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/dma/gf110.c
@@ -33,6 +33,5 @@ gf110_dmaeng_oclass = &(struct nvkm_dma_impl) {
 		.init = _nvkm_dma_init,
 		.fini = _nvkm_dma_fini,
 	},
-	.sclass = gf110_dmaeng_sclass,
-	.bind = gf110_dmaobj_bind,
+	.class_new = gf110_dmaobj_new,
 }.base;
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/dma/nv04.c b/drivers/gpu/drm/nouveau/nvkm/engine/dma/nv04.c
index 32bccdc57d2d..c116995f8494 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/dma/nv04.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/dma/nv04.c
@@ -33,6 +33,5 @@ nv04_dmaeng_oclass = &(struct nvkm_dma_impl) {
 		.init = _nvkm_dma_init,
 		.fini = _nvkm_dma_fini,
 	},
-	.sclass = nv04_dmaeng_sclass,
-	.bind = nv04_dmaobj_bind,
+	.class_new = nv04_dmaobj_new,
 }.base;
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/dma/nv50.c b/drivers/gpu/drm/nouveau/nvkm/engine/dma/nv50.c
index 20346d635c9c..b8d87e7d6ed7 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/dma/nv50.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/dma/nv50.c
@@ -33,6 +33,5 @@ nv50_dmaeng_oclass = &(struct nvkm_dma_impl) {
 		.init = _nvkm_dma_init,
 		.fini = _nvkm_dma_fini,
 	},
-	.sclass = nv50_dmaeng_sclass,
-	.bind = nv50_dmaobj_bind,
+	.class_new = nv50_dmaobj_new,
 }.base;
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/dma/priv.h b/drivers/gpu/drm/nouveau/nvkm/engine/dma/priv.h
index fb2f7eced0cf..fbff168e6cc8 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/dma/priv.h
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/dma/priv.h
@@ -1,5 +1,6 @@
 #ifndef __NVKM_DMA_PRIV_H__
 #define __NVKM_DMA_PRIV_H__
+#define nvkm_dma(p) container_of((p), struct nvkm_dma, engine)
 #include <engine/dma.h>
 
 int _nvkm_dma_ctor(struct nvkm_object *, struct nvkm_object *,
@@ -14,5 +15,7 @@ struct nvkm_dma_impl {
 	struct nvkm_oclass *sclass;
 	int (*bind)(struct nvkm_dmaobj *, struct nvkm_gpuobj *,
 		    struct nvkm_gpuobj **);
+	int (*class_new)(struct nvkm_dma *, const struct nvkm_oclass *,
+			 void *data, u32 size, struct nvkm_dmaobj **);
 };
 #endif
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/dma/user.c b/drivers/gpu/drm/nouveau/nvkm/engine/dma/user.c
index 11571dbd9e91..45ab062661a4 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/dma/user.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/dma/user.c
@@ -24,34 +24,57 @@
 #include "user.h"
 
 #include <core/client.h>
+#include <core/gpuobj.h>
 #include <subdev/fb.h>
 #include <subdev/instmem.h>
 
 #include <nvif/class.h>
 #include <nvif/unpack.h>
 
+static int
+nvkm_dmaobj_bind(struct nvkm_object *base, struct nvkm_gpuobj *gpuobj,
+		 int align, struct nvkm_gpuobj **pgpuobj)
+{
+	struct nvkm_dmaobj *dmaobj = nvkm_dmaobj(base);
+	return dmaobj->func->bind(dmaobj, gpuobj, align, pgpuobj);
+}
+
+static void *
+nvkm_dmaobj_dtor(struct nvkm_object *base)
+{
+	struct nvkm_dmaobj *dmaobj = nvkm_dmaobj(base);
+	if (!RB_EMPTY_NODE(&dmaobj->rb))
+		rb_erase(&dmaobj->rb, &dmaobj->object.client->dmaroot);
+	return dmaobj;
+}
+
+static const struct nvkm_object_func
+nvkm_dmaobj_func = {
+	.dtor = nvkm_dmaobj_dtor,
+	.bind = nvkm_dmaobj_bind,
+};
+
 int
-nvkm_dmaobj_create_(struct nvkm_object *parent,
-		    struct nvkm_object *engine,
-		    struct nvkm_oclass *oclass, void **pdata, u32 *psize,
-		    int length, void **pobject)
+nvkm_dmaobj_ctor(const struct nvkm_dmaobj_func *func, struct nvkm_dma *dma,
+		 const struct nvkm_oclass *oclass, void **pdata, u32 *psize,
+		 struct nvkm_dmaobj *dmaobj)
 {
 	union {
 		struct nv_dma_v0 v0;
 	} *args = *pdata;
-	struct nvkm_instmem *instmem = nvkm_instmem(parent);
-	struct nvkm_client *client = nvkm_client(parent);
-	struct nvkm_device *device = nv_device(parent);
-	struct nvkm_fb *fb = nvkm_fb(parent);
-	struct nvkm_dmaobj *dmaobj;
+	struct nvkm_device *device = dma->engine.subdev.device;
+	struct nvkm_client *client = oclass->client;
+	struct nvkm_object *parent = oclass->parent;
+	struct nvkm_instmem *instmem = device->imem;
+	struct nvkm_fb *fb = device->fb;
 	void *data = *pdata;
 	u32 size = *psize;
 	int ret;
 
-	ret = nvkm_object_create_(parent, engine, oclass, 0, length, pobject);
-	dmaobj = *pobject;
-	if (ret)
-		return ret;
+	nvkm_object_ctor(&nvkm_dmaobj_func, oclass, &dmaobj->object);
+	dmaobj->func = func;
+	dmaobj->dma = dma;
+	RB_CLEAR_NODE(&dmaobj->rb);
 
 	nvif_ioctl(parent, "create dma size %d\n", *psize);
 	if (nvif_unpack(args->v0, 0, 0, true)) {
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/dma/user.h b/drivers/gpu/drm/nouveau/nvkm/engine/dma/user.h
index 83dc1d621e3d..f667505a892b 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/dma/user.h
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/dma/user.h
@@ -1,29 +1,18 @@
 #ifndef __NVKM_DMA_USER_H__
 #define __NVKM_DMA_USER_H__
+#define nvkm_dmaobj(p) container_of((p), struct nvkm_dmaobj, object)
 #include "priv.h"
 
-#define nvkm_dmaobj_create(p,e,c,pa,sa,d)                                      \
-	nvkm_dmaobj_create_((p), (e), (c), (pa), (sa), sizeof(**d), (void **)d)
-
-int nvkm_dmaobj_create_(struct nvkm_object *, struct nvkm_object *,
-			struct nvkm_oclass *, void **, u32 *,
-			int, void **);
-#define _nvkm_dmaobj_dtor nvkm_object_destroy
-#define _nvkm_dmaobj_init _nvkm_object_init
-#define _nvkm_dmaobj_fini _nvkm_object_fini
-
-extern struct nvkm_oclass nv04_dmaeng_sclass[];
-extern struct nvkm_oclass nv50_dmaeng_sclass[];
-extern struct nvkm_oclass gf100_dmaeng_sclass[];
-extern struct nvkm_oclass gf110_dmaeng_sclass[];
-
-int nv04_dmaobj_bind(struct nvkm_dmaobj *, struct nvkm_gpuobj *,
-		     struct nvkm_gpuobj **);
-int nv50_dmaobj_bind(struct nvkm_dmaobj *, struct nvkm_gpuobj *,
-		     struct nvkm_gpuobj **);
-int gf100_dmaobj_bind(struct nvkm_dmaobj *, struct nvkm_gpuobj *,
-		      struct nvkm_gpuobj **);
-int gf110_dmaobj_bind(struct nvkm_dmaobj *, struct nvkm_gpuobj *,
-		      struct nvkm_gpuobj **);
+int nvkm_dmaobj_ctor(const struct nvkm_dmaobj_func *, struct nvkm_dma *,
+		     const struct nvkm_oclass *, void **data, u32 *size,
+		     struct nvkm_dmaobj *);
 
+int nv04_dmaobj_new(struct nvkm_dma *, const struct nvkm_oclass *, void *, u32,
+		    struct nvkm_dmaobj **);
+int nv50_dmaobj_new(struct nvkm_dma *, const struct nvkm_oclass *, void *, u32,
+		    struct nvkm_dmaobj **);
+int gf100_dmaobj_new(struct nvkm_dma *, const struct nvkm_oclass *, void *, u32,
+		     struct nvkm_dmaobj **);
+int gf110_dmaobj_new(struct nvkm_dma *, const struct nvkm_oclass *, void *, u32,
+		     struct nvkm_dmaobj **);
 #endif
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/dma/usergf100.c b/drivers/gpu/drm/nouveau/nvkm/engine/dma/usergf100.c
index 3f2d7d93f026..13e341cc4e32 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/dma/usergf100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/dma/usergf100.c
@@ -21,6 +21,7 @@
  *
  * Authors: Ben Skeggs
  */
+#define gf100_dmaobj(p) container_of((p), struct gf100_dmaobj, base)
 #include "user.h"
 
 #include <core/client.h>
@@ -36,18 +37,18 @@ struct gf100_dmaobj {
 	u32 flags5;
 };
 
-int
-gf100_dmaobj_bind(struct nvkm_dmaobj *obj, struct nvkm_gpuobj *parent,
-		  struct nvkm_gpuobj **pgpuobj)
+static int
+gf100_dmaobj_bind(struct nvkm_dmaobj *base, struct nvkm_gpuobj *parent,
+		  int align, struct nvkm_gpuobj **pgpuobj)
 {
-	struct gf100_dmaobj *dmaobj = container_of(obj, typeof(*dmaobj), base);
-	struct nvkm_device *device = dmaobj->base.base.engine->subdev.device;
+	struct gf100_dmaobj *dmaobj = gf100_dmaobj(base);
+	struct nvkm_device *device = dmaobj->base.dma->engine.subdev.device;
 	int ret;
 
-	ret = nvkm_gpuobj_new(device, 24, 32, false, parent, pgpuobj);
+	ret = nvkm_gpuobj_new(device, 24, align, false, parent, pgpuobj);
 	if (ret == 0) {
 		nvkm_kmap(*pgpuobj);
-		nvkm_wo32(*pgpuobj, 0x00, dmaobj->flags0 | nv_mclass(dmaobj));
+		nvkm_wo32(*pgpuobj, 0x00, dmaobj->flags0);
 		nvkm_wo32(*pgpuobj, 0x04, lower_32_bits(dmaobj->base.limit));
 		nvkm_wo32(*pgpuobj, 0x08, lower_32_bits(dmaobj->base.start));
 		nvkm_wo32(*pgpuobj, 0x0c, upper_32_bits(dmaobj->base.limit) << 24 |
@@ -60,23 +61,32 @@ gf100_dmaobj_bind(struct nvkm_dmaobj *obj, struct nvkm_gpuobj *parent,
 	return ret;
 }
 
-static int
-gf100_dmaobj_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-		  struct nvkm_oclass *oclass, void *data, u32 size,
-		  struct nvkm_object **pobject)
+static const struct nvkm_dmaobj_func
+gf100_dmaobj_func = {
+	.bind = gf100_dmaobj_bind,
+};
+
+int
+gf100_dmaobj_new(struct nvkm_dma *dma, const struct nvkm_oclass *oclass,
+		 void *data, u32 size, struct nvkm_dmaobj **pdmaobj)
 {
-	struct nvkm_dma *dmaeng = (void *)engine;
 	union {
 		struct gf100_dma_v0 v0;
 	} *args;
+	struct nvkm_object *parent = oclass->parent;
 	struct gf100_dmaobj *dmaobj;
 	u32 kind, user, unkn;
 	int ret;
 
-	ret = nvkm_dmaobj_create(parent, engine, oclass, &data, &size, &dmaobj);
-	*pobject = nv_object(dmaobj);
+	if (!(dmaobj = kzalloc(sizeof(*dmaobj), GFP_KERNEL)))
+		return -ENOMEM;
+	*pdmaobj = &dmaobj->base;
+
+	ret = nvkm_dmaobj_ctor(&gf100_dmaobj_func, dma, oclass,
+			       &data, &size, &dmaobj->base);
 	if (ret)
 		return ret;
+
 	args = data;
 
 	nvif_ioctl(parent, "create gf100 dma size %d\n", size);
@@ -103,7 +113,7 @@ gf100_dmaobj_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
 
 	if (user > 2)
 		return -EINVAL;
-	dmaobj->flags0 |= (kind << 22) | (user << 20);
+	dmaobj->flags0 |= (kind << 22) | (user << 20) | oclass->base.oclass;
 	dmaobj->flags5 |= (unkn << 16);
 
 	switch (dmaobj->base.target) {
@@ -135,21 +145,5 @@ gf100_dmaobj_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
 		break;
 	}
 
-	return dmaeng->bind(&dmaobj->base, (void *)dmaobj, (void *)pobject);
+	return 0;
 }
-
-static struct nvkm_ofuncs
-gf100_dmaobj_ofuncs = {
-	.ctor =  gf100_dmaobj_ctor,
-	.dtor = _nvkm_dmaobj_dtor,
-	.init = _nvkm_dmaobj_init,
-	.fini = _nvkm_dmaobj_fini,
-};
-
-struct nvkm_oclass
-gf100_dmaeng_sclass[] = {
-	{ NV_DMA_FROM_MEMORY, &gf100_dmaobj_ofuncs },
-	{ NV_DMA_TO_MEMORY, &gf100_dmaobj_ofuncs },
-	{ NV_DMA_IN_MEMORY, &gf100_dmaobj_ofuncs },
-	{}
-};
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/dma/usergf110.c b/drivers/gpu/drm/nouveau/nvkm/engine/dma/usergf110.c
index db22a8b2033c..f6bbdffed4e7 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/dma/usergf110.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/dma/usergf110.c
@@ -21,6 +21,7 @@
  *
  * Authors: Ben Skeggs
  */
+#define gf110_dmaobj(p) container_of((p), struct gf110_dmaobj, base)
 #include "user.h"
 
 #include <core/client.h>
@@ -35,15 +36,15 @@ struct gf110_dmaobj {
 	u32 flags0;
 };
 
-int
-gf110_dmaobj_bind(struct nvkm_dmaobj *obj, struct nvkm_gpuobj *parent,
-		  struct nvkm_gpuobj **pgpuobj)
+static int
+gf110_dmaobj_bind(struct nvkm_dmaobj *base, struct nvkm_gpuobj *parent,
+		  int align, struct nvkm_gpuobj **pgpuobj)
 {
-	struct gf110_dmaobj *dmaobj = container_of(obj, typeof(*dmaobj), base);
-	struct nvkm_device *device = dmaobj->base.base.engine->subdev.device;
+	struct gf110_dmaobj *dmaobj = gf110_dmaobj(base);
+	struct nvkm_device *device = dmaobj->base.dma->engine.subdev.device;
 	int ret;
 
-	ret = nvkm_gpuobj_new(device, 24, 32, false, parent, pgpuobj);
+	ret = nvkm_gpuobj_new(device, 24, align, false, parent, pgpuobj);
 	if (ret == 0) {
 		nvkm_kmap(*pgpuobj);
 		nvkm_wo32(*pgpuobj, 0x00, dmaobj->flags0);
@@ -58,23 +59,32 @@ gf110_dmaobj_bind(struct nvkm_dmaobj *obj, struct nvkm_gpuobj *parent,
 	return ret;
 }
 
-static int
-gf110_dmaobj_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-		  struct nvkm_oclass *oclass, void *data, u32 size,
-		  struct nvkm_object **pobject)
+static const struct nvkm_dmaobj_func
+gf110_dmaobj_func = {
+	.bind = gf110_dmaobj_bind,
+};
+
+int
+gf110_dmaobj_new(struct nvkm_dma *dma, const struct nvkm_oclass *oclass,
+		 void *data, u32 size, struct nvkm_dmaobj **pdmaobj)
 {
-	struct nvkm_dma *dmaeng = (void *)engine;
 	union {
 		struct gf110_dma_v0 v0;
 	} *args;
+	struct nvkm_object *parent = oclass->parent;
 	struct gf110_dmaobj *dmaobj;
 	u32 kind, page;
 	int ret;
 
-	ret = nvkm_dmaobj_create(parent, engine, oclass, &data, &size, &dmaobj);
-	*pobject = nv_object(dmaobj);
+	if (!(dmaobj = kzalloc(sizeof(*dmaobj), GFP_KERNEL)))
+		return -ENOMEM;
+	*pdmaobj = &dmaobj->base;
+
+	ret = nvkm_dmaobj_ctor(&gf110_dmaobj_func, dma, oclass,
+			       &data, &size, &dmaobj->base);
 	if (ret)
 		return ret;
+
 	args = data;
 
 	nvif_ioctl(parent, "create gf110 dma size %d\n", size);
@@ -117,21 +127,5 @@ gf110_dmaobj_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
 		return -EINVAL;
 	}
 
-	return dmaeng->bind(&dmaobj->base, (void *)dmaobj, (void *)pobject);
+	return 0;
 }
-
-static struct nvkm_ofuncs
-gf110_dmaobj_ofuncs = {
-	.ctor =  gf110_dmaobj_ctor,
-	.dtor = _nvkm_dmaobj_dtor,
-	.init = _nvkm_dmaobj_init,
-	.fini = _nvkm_dmaobj_fini,
-};
-
-struct nvkm_oclass
-gf110_dmaeng_sclass[] = {
-	{ NV_DMA_FROM_MEMORY, &gf110_dmaobj_ofuncs },
-	{ NV_DMA_TO_MEMORY, &gf110_dmaobj_ofuncs },
-	{ NV_DMA_IN_MEMORY, &gf110_dmaobj_ofuncs },
-	{}
-};
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/dma/usernv04.c b/drivers/gpu/drm/nouveau/nvkm/engine/dma/usernv04.c
index bd8ca8ec09b6..2c2fb0988ed4 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/dma/usernv04.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/dma/usernv04.c
@@ -21,6 +21,7 @@
  *
  * Authors: Ben Skeggs
  */
+#define nv04_dmaobj(p) container_of((p), struct nv04_dmaobj, base)
 #include "user.h"
 
 #include <core/gpuobj.h>
@@ -36,19 +37,19 @@ struct nv04_dmaobj {
 	u32 flags2;
 };
 
-int
-nv04_dmaobj_bind(struct nvkm_dmaobj *obj, struct nvkm_gpuobj *parent,
-		 struct nvkm_gpuobj **pgpuobj)
+static int
+nv04_dmaobj_bind(struct nvkm_dmaobj *base, struct nvkm_gpuobj *parent,
+		 int align, struct nvkm_gpuobj **pgpuobj)
 {
-	struct nv04_dmaobj *dmaobj = container_of(obj, typeof(*dmaobj), base);
-	struct nvkm_device *device = dmaobj->base.base.engine->subdev.device;
+	struct nv04_dmaobj *dmaobj = nv04_dmaobj(base);
+	struct nvkm_device *device = dmaobj->base.dma->engine.subdev.device;
 	u64 offset = dmaobj->base.start & 0xfffff000;
 	u64 adjust = dmaobj->base.start & 0x00000fff;
 	u32 length = dmaobj->base.limit - dmaobj->base.start;
 	int ret;
 
 	if (dmaobj->clone) {
-		struct nv04_mmu *mmu = nv04_mmu(dmaobj);
+		struct nv04_mmu *mmu = nv04_mmu(device->mmu);
 		struct nvkm_memory *pgt = mmu->vm->pgt[0].mem[0];
 		if (!dmaobj->base.start)
 			return nvkm_gpuobj_wrap(pgt, pgpuobj);
@@ -58,7 +59,7 @@ nv04_dmaobj_bind(struct nvkm_dmaobj *obj, struct nvkm_gpuobj *parent,
 		nvkm_done(pgt);
 	}
 
-	ret = nvkm_gpuobj_new(device, 16, 16, false, parent, pgpuobj);
+	ret = nvkm_gpuobj_new(device, 16, align, false, parent, pgpuobj);
 	if (ret == 0) {
 		nvkm_kmap(*pgpuobj);
 		nvkm_wo32(*pgpuobj, 0x00, dmaobj->flags0 | (adjust << 20));
@@ -71,19 +72,26 @@ nv04_dmaobj_bind(struct nvkm_dmaobj *obj, struct nvkm_gpuobj *parent,
 	return ret;
 }
 
-static int
-nv04_dmaobj_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-		 struct nvkm_oclass *oclass, void *data, u32 size,
-		 struct nvkm_object **pobject)
+static const struct nvkm_dmaobj_func
+nv04_dmaobj_func = {
+	.bind = nv04_dmaobj_bind,
+};
+
+int
+nv04_dmaobj_new(struct nvkm_dma *dma, const struct nvkm_oclass *oclass,
+		void *data, u32 size, struct nvkm_dmaobj **pdmaobj)
 {
-	struct nvkm_dma *dmaeng = (void *)engine;
-	struct nv04_mmu *mmu = nv04_mmu(engine);
+	struct nv04_mmu *mmu = nv04_mmu(dma);
 	struct nv04_dmaobj *dmaobj;
 	int ret;
 
-	ret = nvkm_dmaobj_create(parent, engine, oclass, &data, &size, &dmaobj);
-	*pobject = nv_object(dmaobj);
-	if (ret || (ret = -ENOSYS, size))
+	if (!(dmaobj = kzalloc(sizeof(*dmaobj), GFP_KERNEL)))
+		return -ENOMEM;
+	*pdmaobj = &dmaobj->base;
+
+	ret = nvkm_dmaobj_ctor(&nv04_dmaobj_func, dma, oclass,
+			       &data, &size, &dmaobj->base);
+	if (ret)
 		return ret;
 
 	if (dmaobj->base.target == NV_MEM_TARGET_VM) {
@@ -93,7 +101,7 @@ nv04_dmaobj_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
 		dmaobj->base.access = NV_MEM_ACCESS_RW;
 	}
 
-	dmaobj->flags0 = nv_mclass(dmaobj);
+	dmaobj->flags0 = oclass->base.oclass;
 	switch (dmaobj->base.target) {
 	case NV_MEM_TARGET_VRAM:
 		dmaobj->flags0 |= 0x00003000;
@@ -121,21 +129,5 @@ nv04_dmaobj_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
 		return -EINVAL;
 	}
 
-	return dmaeng->bind(&dmaobj->base, (void *)dmaobj, (void *)pobject);
+	return 0;
 }
-
-static struct nvkm_ofuncs
-nv04_dmaobj_ofuncs = {
-	.ctor =  nv04_dmaobj_ctor,
-	.dtor = _nvkm_dmaobj_dtor,
-	.init = _nvkm_dmaobj_init,
-	.fini = _nvkm_dmaobj_fini,
-};
-
-struct nvkm_oclass
-nv04_dmaeng_sclass[] = {
-	{ NV_DMA_FROM_MEMORY, &nv04_dmaobj_ofuncs },
-	{ NV_DMA_TO_MEMORY, &nv04_dmaobj_ofuncs },
-	{ NV_DMA_IN_MEMORY, &nv04_dmaobj_ofuncs },
-	{}
-};
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/dma/usernv50.c b/drivers/gpu/drm/nouveau/nvkm/engine/dma/usernv50.c
index fd99b1e15143..5b7ce313ea14 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/dma/usernv50.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/dma/usernv50.c
@@ -21,6 +21,7 @@
  *
  * Authors: Ben Skeggs
  */
+#define nv50_dmaobj(p) container_of((p), struct nv50_dmaobj, base)
 #include "user.h"
 
 #include <core/client.h>
@@ -36,18 +37,18 @@ struct nv50_dmaobj {
 	u32 flags5;
 };
 
-int
-nv50_dmaobj_bind(struct nvkm_dmaobj *obj, struct nvkm_gpuobj *parent,
-		 struct nvkm_gpuobj **pgpuobj)
+static int
+nv50_dmaobj_bind(struct nvkm_dmaobj *base, struct nvkm_gpuobj *parent,
+		 int align, struct nvkm_gpuobj **pgpuobj)
 {
-	struct nv50_dmaobj *dmaobj = container_of(obj, typeof(*dmaobj), base);
-	struct nvkm_device *device = dmaobj->base.base.engine->subdev.device;
+	struct nv50_dmaobj *dmaobj = nv50_dmaobj(base);
+	struct nvkm_device *device = dmaobj->base.dma->engine.subdev.device;
 	int ret;
 
-	ret = nvkm_gpuobj_new(device, 24, 32, false, parent, pgpuobj);
+	ret = nvkm_gpuobj_new(device, 24, align, false, parent, pgpuobj);
 	if (ret == 0) {
 		nvkm_kmap(*pgpuobj);
-		nvkm_wo32(*pgpuobj, 0x00, dmaobj->flags0 | nv_mclass(dmaobj));
+		nvkm_wo32(*pgpuobj, 0x00, dmaobj->flags0);
 		nvkm_wo32(*pgpuobj, 0x04, lower_32_bits(dmaobj->base.limit));
 		nvkm_wo32(*pgpuobj, 0x08, lower_32_bits(dmaobj->base.start));
 		nvkm_wo32(*pgpuobj, 0x0c, upper_32_bits(dmaobj->base.limit) << 24 |
@@ -60,23 +61,32 @@ nv50_dmaobj_bind(struct nvkm_dmaobj *obj, struct nvkm_gpuobj *parent,
 	return ret;
 }
 
-static int
-nv50_dmaobj_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-		 struct nvkm_oclass *oclass, void *data, u32 size,
-		 struct nvkm_object **pobject)
+static const struct nvkm_dmaobj_func
+nv50_dmaobj_func = {
+	.bind = nv50_dmaobj_bind,
+};
+
+int
+nv50_dmaobj_new(struct nvkm_dma *dma, const struct nvkm_oclass *oclass,
+		void *data, u32 size, struct nvkm_dmaobj **pdmaobj)
 {
-	struct nvkm_dma *dmaeng = (void *)engine;
 	union {
 		struct nv50_dma_v0 v0;
 	} *args;
+	struct nvkm_object *parent = oclass->parent;
 	struct nv50_dmaobj *dmaobj;
 	u32 user, part, comp, kind;
 	int ret;
 
-	ret = nvkm_dmaobj_create(parent, engine, oclass, &data, &size, &dmaobj);
-	*pobject = nv_object(dmaobj);
+	if (!(dmaobj = kzalloc(sizeof(*dmaobj), GFP_KERNEL)))
+		return -ENOMEM;
+	*pdmaobj = &dmaobj->base;
+
+	ret = nvkm_dmaobj_ctor(&nv50_dmaobj_func, dma, oclass,
+			       &data, &size, &dmaobj->base);
 	if (ret)
 		return ret;
+
 	args = data;
 
 	nvif_ioctl(parent, "create nv50 dma size %d\n", size);
@@ -107,7 +117,8 @@ nv50_dmaobj_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
 
 	if (user > 2 || part > 2 || comp > 3 || kind > 0x7f)
 		return -EINVAL;
-	dmaobj->flags0 = (comp << 29) | (kind << 22) | (user << 20);
+	dmaobj->flags0 = (comp << 29) | (kind << 22) | (user << 20) |
+			 oclass->base.oclass;
 	dmaobj->flags5 = (part << 16);
 
 	switch (dmaobj->base.target) {
@@ -141,21 +152,5 @@ nv50_dmaobj_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
 		return -EINVAL;
 	}
 
-	return dmaeng->bind(&dmaobj->base, (void *)dmaobj, (void *)pobject);
+	return 0;
 }
-
-static struct nvkm_ofuncs
-nv50_dmaobj_ofuncs = {
-	.ctor =  nv50_dmaobj_ctor,
-	.dtor = _nvkm_dmaobj_dtor,
-	.init = _nvkm_dmaobj_init,
-	.fini = _nvkm_dmaobj_fini,
-};
-
-struct nvkm_oclass
-nv50_dmaeng_sclass[] = {
-	{ NV_DMA_FROM_MEMORY, &nv50_dmaobj_ofuncs },
-	{ NV_DMA_TO_MEMORY, &nv50_dmaobj_ofuncs },
-	{ NV_DMA_IN_MEMORY, &nv50_dmaobj_ofuncs },
-	{}
-};
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/base.c b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/base.c
index a3b663832dbf..958f290d088e 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/fifo/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/fifo/base.c
@@ -99,14 +99,13 @@ nvkm_fifo_channel_create_(struct nvkm_object *parent,
 			  u64 engmask, int len, void **ptr)
 {
 	struct nvkm_client *client = nvkm_client(parent);
-	struct nvkm_handle *handle;
 	struct nvkm_dmaobj *dmaobj;
 	struct nvkm_fifo *fifo = (void *)engine;
 	struct nvkm_fifo_base *base = (void *)parent;
 	struct nvkm_fifo_chan *chan;
-	struct nvkm_dma *dma;
 	struct nvkm_subdev *subdev = &fifo->engine.subdev;
 	struct nvkm_device *device = subdev->device;
+	struct nvkm_dma *dma = device->dma;
 	unsigned long flags;
 	int ret;
 
@@ -119,21 +118,12 @@ nvkm_fifo_channel_create_(struct nvkm_object *parent,
 
 	/* validate dma object representing push buffer */
 	if (pushbuf) {
-		handle = nvkm_client_search(client, pushbuf);
-		if (!handle)
+		dmaobj = nvkm_dma_search(dma, client, pushbuf);
+		if (!dmaobj)
 			return -ENOENT;
-		dmaobj = (void *)handle->object;
 
-		dma = (void *)dmaobj->base.engine;
-		switch (dmaobj->base.oclass->handle) {
-		case NV_DMA_FROM_MEMORY:
-		case NV_DMA_IN_MEMORY:
-			break;
-		default:
-			return -EINVAL;
-		}
-
-		ret = dma->bind(dmaobj, &base->gpuobj, &chan->pushgpu);
+		ret = dmaobj->func->bind(dmaobj, &base->gpuobj, 16,
+					 &chan->pushgpu);
 		if (ret)
 			return ret;
 	}