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drm/nouveau/fuse: namespace + nvidia gpu names (no binary change) 

The namespace of NVKM is being changed to nvkm_ instead of nouveau_,
which will be used for the DRM part of the driver.  This is being
done in order to make it very clear as to what part of the driver a
given symbol belongs to, and as a minor step towards splitting the
DRM driver out to be able to stand on its own (for virt).

Because there's already a large amount of churn here anyway, this is
as good a time as any to also switch to NVIDIA's device and chipset
naming to ease collaboration with them.

A comparison of objdump disassemblies proves no code changes.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2015-01-14 14:53:51 +10:00
parent 639c308eff
commit 630ec6c0d3
9 changed files with 87 additions and 105 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/nouveau/include/nvkm/core/os.h
View File

@ -237,5 +237,6 @@
#define nouveau_fb nvkm_fb
#define nouveau_fb_tile nvkm_fb_tile
#define nvc0_pte_storage_type_map gf100_pte_storage_type_map
#define nouveau_fuse nvkm_fuse
#endif

36
drivers/gpu/drm/nouveau/include/nvkm/subdev/fuse.h
View File

@ -1,30 +1,28 @@
#ifndef __NOUVEAU_FUSE_H__
#define __NOUVEAU_FUSE_H__
#ifndef __NVKM_FUSE_H__
#define __NVKM_FUSE_H__
#include <core/subdev.h>
#include <core/device.h>
struct nouveau_fuse {
struct nouveau_subdev base;
struct nvkm_fuse {
struct nvkm_subdev base;
};
static inline struct nouveau_fuse *
nouveau_fuse(void *obj)
static inline struct nvkm_fuse *
nvkm_fuse(void *obj)
{
return (void *)nouveau_subdev(obj, NVDEV_SUBDEV_FUSE);
return (void *)nvkm_subdev(obj, NVDEV_SUBDEV_FUSE);
}
#define nouveau_fuse_create(p, e, o, d) \
nouveau_fuse_create_((p), (e), (o), sizeof(**d), (void **)d)
#define nvkm_fuse_create(p, e, o, d) \
nvkm_fuse_create_((p), (e), (o), sizeof(**d), (void **)d)
int nouveau_fuse_create_(struct nouveau_object *, struct nouveau_object *,
struct nouveau_oclass *, int, void **);
void _nouveau_fuse_dtor(struct nouveau_object *);
int _nouveau_fuse_init(struct nouveau_object *);
#define _nouveau_fuse_fini _nouveau_subdev_fini
extern struct nouveau_oclass g80_fuse_oclass;
extern struct nouveau_oclass gf100_fuse_oclass;
extern struct nouveau_oclass gm107_fuse_oclass;
int nvkm_fuse_create_(struct nvkm_object *, struct nvkm_object *,
struct nvkm_oclass *, int, void **);
void _nvkm_fuse_dtor(struct nvkm_object *);
int _nvkm_fuse_init(struct nvkm_object *);
#define _nvkm_fuse_fini _nvkm_subdev_fini
extern struct nvkm_oclass nv50_fuse_oclass;
extern struct nvkm_oclass gf100_fuse_oclass;
extern struct nvkm_oclass gm107_fuse_oclass;
#endif

28
drivers/gpu/drm/nouveau/nvkm/engine/device/nv50.c
View File

@ -66,7 +66,7 @@ nv50_identify(struct nouveau_device *device)
device->oclass[NVDEV_SUBDEV_VBIOS ] = &nouveau_bios_oclass;
device->oclass[NVDEV_SUBDEV_GPIO ] = nv50_gpio_oclass;
device->oclass[NVDEV_SUBDEV_I2C ] = nv50_i2c_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &g80_fuse_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &nv50_fuse_oclass;
device->oclass[NVDEV_SUBDEV_CLK ] = nv50_clk_oclass;
device->oclass[NVDEV_SUBDEV_THERM ] = &nv50_therm_oclass;
device->oclass[NVDEV_SUBDEV_MXM ] = &nv50_mxm_oclass;
@ -92,7 +92,7 @@ nv50_identify(struct nouveau_device *device)
device->oclass[NVDEV_SUBDEV_VBIOS ] = &nouveau_bios_oclass;
device->oclass[NVDEV_SUBDEV_GPIO ] = nv50_gpio_oclass;
device->oclass[NVDEV_SUBDEV_I2C ] = nv50_i2c_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &g80_fuse_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &nv50_fuse_oclass;
device->oclass[NVDEV_SUBDEV_CLK ] = g84_clk_oclass;
device->oclass[NVDEV_SUBDEV_THERM ] = &nv84_therm_oclass;
device->oclass[NVDEV_SUBDEV_MXM ] = &nv50_mxm_oclass;
@ -121,7 +121,7 @@ nv50_identify(struct nouveau_device *device)
device->oclass[NVDEV_SUBDEV_VBIOS ] = &nouveau_bios_oclass;
device->oclass[NVDEV_SUBDEV_GPIO ] = nv50_gpio_oclass;
device->oclass[NVDEV_SUBDEV_I2C ] = nv50_i2c_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &g80_fuse_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &nv50_fuse_oclass;
device->oclass[NVDEV_SUBDEV_CLK ] = g84_clk_oclass;
device->oclass[NVDEV_SUBDEV_THERM ] = &nv84_therm_oclass;
device->oclass[NVDEV_SUBDEV_MXM ] = &nv50_mxm_oclass;
@ -150,7 +150,7 @@ nv50_identify(struct nouveau_device *device)
device->oclass[NVDEV_SUBDEV_VBIOS ] = &nouveau_bios_oclass;
device->oclass[NVDEV_SUBDEV_GPIO ] = nv50_gpio_oclass;
device->oclass[NVDEV_SUBDEV_I2C ] = nv50_i2c_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &g80_fuse_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &nv50_fuse_oclass;
device->oclass[NVDEV_SUBDEV_CLK ] = g84_clk_oclass;
device->oclass[NVDEV_SUBDEV_THERM ] = &nv84_therm_oclass;
device->oclass[NVDEV_SUBDEV_MXM ] = &nv50_mxm_oclass;
@ -179,7 +179,7 @@ nv50_identify(struct nouveau_device *device)
device->oclass[NVDEV_SUBDEV_VBIOS ] = &nouveau_bios_oclass;
device->oclass[NVDEV_SUBDEV_GPIO ] = nv94_gpio_oclass;
device->oclass[NVDEV_SUBDEV_I2C ] = nv94_i2c_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &g80_fuse_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &nv50_fuse_oclass;
device->oclass[NVDEV_SUBDEV_CLK ] = g84_clk_oclass;
device->oclass[NVDEV_SUBDEV_THERM ] = &nv84_therm_oclass;
device->oclass[NVDEV_SUBDEV_MXM ] = &nv50_mxm_oclass;
@ -208,7 +208,7 @@ nv50_identify(struct nouveau_device *device)
device->oclass[NVDEV_SUBDEV_VBIOS ] = &nouveau_bios_oclass;
device->oclass[NVDEV_SUBDEV_GPIO ] = nv94_gpio_oclass;
device->oclass[NVDEV_SUBDEV_I2C ] = nv94_i2c_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &g80_fuse_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &nv50_fuse_oclass;
device->oclass[NVDEV_SUBDEV_CLK ] = g84_clk_oclass;
device->oclass[NVDEV_SUBDEV_THERM ] = &nv84_therm_oclass;
device->oclass[NVDEV_SUBDEV_MXM ] = &nv50_mxm_oclass;
@ -237,7 +237,7 @@ nv50_identify(struct nouveau_device *device)
device->oclass[NVDEV_SUBDEV_VBIOS ] = &nouveau_bios_oclass;
device->oclass[NVDEV_SUBDEV_GPIO ] = nv94_gpio_oclass;
device->oclass[NVDEV_SUBDEV_I2C ] = nv94_i2c_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &g80_fuse_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &nv50_fuse_oclass;
device->oclass[NVDEV_SUBDEV_CLK ] = g84_clk_oclass;
device->oclass[NVDEV_SUBDEV_THERM ] = &nv84_therm_oclass;
device->oclass[NVDEV_SUBDEV_MXM ] = &nv50_mxm_oclass;
@ -266,7 +266,7 @@ nv50_identify(struct nouveau_device *device)
device->oclass[NVDEV_SUBDEV_VBIOS ] = &nouveau_bios_oclass;
device->oclass[NVDEV_SUBDEV_GPIO ] = nv94_gpio_oclass;
device->oclass[NVDEV_SUBDEV_I2C ] = nv50_i2c_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &g80_fuse_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &nv50_fuse_oclass;
device->oclass[NVDEV_SUBDEV_CLK ] = g84_clk_oclass;
device->oclass[NVDEV_SUBDEV_THERM ] = &nv84_therm_oclass;
device->oclass[NVDEV_SUBDEV_MXM ] = &nv50_mxm_oclass;
@ -295,7 +295,7 @@ nv50_identify(struct nouveau_device *device)
device->oclass[NVDEV_SUBDEV_VBIOS ] = &nouveau_bios_oclass;
device->oclass[NVDEV_SUBDEV_GPIO ] = nv94_gpio_oclass;
device->oclass[NVDEV_SUBDEV_I2C ] = nv94_i2c_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &g80_fuse_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &nv50_fuse_oclass;
device->oclass[NVDEV_SUBDEV_CLK ] = mcp77_clk_oclass;
device->oclass[NVDEV_SUBDEV_THERM ] = &nv84_therm_oclass;
device->oclass[NVDEV_SUBDEV_MXM ] = &nv50_mxm_oclass;
@ -324,7 +324,7 @@ nv50_identify(struct nouveau_device *device)
device->oclass[NVDEV_SUBDEV_VBIOS ] = &nouveau_bios_oclass;
device->oclass[NVDEV_SUBDEV_GPIO ] = nv94_gpio_oclass;
device->oclass[NVDEV_SUBDEV_I2C ] = nv94_i2c_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &g80_fuse_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &nv50_fuse_oclass;
device->oclass[NVDEV_SUBDEV_CLK ] = mcp77_clk_oclass;
device->oclass[NVDEV_SUBDEV_THERM ] = &nv84_therm_oclass;
device->oclass[NVDEV_SUBDEV_MXM ] = &nv50_mxm_oclass;
@ -353,7 +353,7 @@ nv50_identify(struct nouveau_device *device)
device->oclass[NVDEV_SUBDEV_VBIOS ] = &nouveau_bios_oclass;
device->oclass[NVDEV_SUBDEV_GPIO ] = nv94_gpio_oclass;
device->oclass[NVDEV_SUBDEV_I2C ] = nv94_i2c_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &g80_fuse_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &nv50_fuse_oclass;
device->oclass[NVDEV_SUBDEV_CLK ] = &gt215_clk_oclass;
device->oclass[NVDEV_SUBDEV_THERM ] = &nva3_therm_oclass;
device->oclass[NVDEV_SUBDEV_MXM ] = &nv50_mxm_oclass;
@ -384,7 +384,7 @@ nv50_identify(struct nouveau_device *device)
device->oclass[NVDEV_SUBDEV_VBIOS ] = &nouveau_bios_oclass;
device->oclass[NVDEV_SUBDEV_GPIO ] = nv94_gpio_oclass;
device->oclass[NVDEV_SUBDEV_I2C ] = nv94_i2c_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &g80_fuse_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &nv50_fuse_oclass;
device->oclass[NVDEV_SUBDEV_CLK ] = &gt215_clk_oclass;
device->oclass[NVDEV_SUBDEV_THERM ] = &nva3_therm_oclass;
device->oclass[NVDEV_SUBDEV_MXM ] = &nv50_mxm_oclass;
@ -414,7 +414,7 @@ nv50_identify(struct nouveau_device *device)
device->oclass[NVDEV_SUBDEV_VBIOS ] = &nouveau_bios_oclass;
device->oclass[NVDEV_SUBDEV_GPIO ] = nv94_gpio_oclass;
device->oclass[NVDEV_SUBDEV_I2C ] = nv94_i2c_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &g80_fuse_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &nv50_fuse_oclass;
device->oclass[NVDEV_SUBDEV_CLK ] = &gt215_clk_oclass;
device->oclass[NVDEV_SUBDEV_THERM ] = &nva3_therm_oclass;
device->oclass[NVDEV_SUBDEV_MXM ] = &nv50_mxm_oclass;
@ -444,7 +444,7 @@ nv50_identify(struct nouveau_device *device)
device->oclass[NVDEV_SUBDEV_VBIOS ] = &nouveau_bios_oclass;
device->oclass[NVDEV_SUBDEV_GPIO ] = nv94_gpio_oclass;
device->oclass[NVDEV_SUBDEV_I2C ] = nv94_i2c_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &g80_fuse_oclass;
device->oclass[NVDEV_SUBDEV_FUSE ] = &nv50_fuse_oclass;
device->oclass[NVDEV_SUBDEV_CLK ] = &gt215_clk_oclass;
device->oclass[NVDEV_SUBDEV_THERM ] = &nva3_therm_oclass;
device->oclass[NVDEV_SUBDEV_MXM ] = &nv50_mxm_oclass;

2
drivers/gpu/drm/nouveau/nvkm/subdev/fuse/Kbuild
View File

@ -1,4 +1,4 @@
nvkm-y += nvkm/subdev/fuse/base.o
nvkm-y += nvkm/subdev/fuse/g80.o
nvkm-y += nvkm/subdev/fuse/nv50.o
nvkm-y += nvkm/subdev/fuse/gf100.o
nvkm-y += nvkm/subdev/fuse/gm107.o

23
drivers/gpu/drm/nouveau/nvkm/subdev/fuse/base.c
View File

@ -21,34 +21,31 @@
*
* Authors: Martin Peres
*/
#include <subdev/fuse.h>
int
_nouveau_fuse_init(struct nouveau_object *object)
_nvkm_fuse_init(struct nvkm_object *object)
{
struct nouveau_fuse *fuse = (void *)object;
return nouveau_subdev_init(&fuse->base);
struct nvkm_fuse *fuse = (void *)object;
return nvkm_subdev_init(&fuse->base);
}
void
_nouveau_fuse_dtor(struct nouveau_object *object)
_nvkm_fuse_dtor(struct nvkm_object *object)
{
struct nouveau_fuse *fuse = (void *)object;
nouveau_subdev_destroy(&fuse->base);
struct nvkm_fuse *fuse = (void *)object;
nvkm_subdev_destroy(&fuse->base);
}
int
nouveau_fuse_create_(struct nouveau_object *parent,
struct nouveau_object *engine,
struct nouveau_oclass *oclass, int length, void **pobject)
nvkm_fuse_create_(struct nvkm_object *parent, struct nvkm_object *engine,
struct nvkm_oclass *oclass, int length, void **pobject)
{
struct nouveau_fuse *fuse;
struct nvkm_fuse *fuse;
int ret;
ret = nouveau_subdev_create_(parent, engine, oclass, 0, "FUSE",
ret = nvkm_subdev_create_(parent, engine, oclass, 0, "FUSE",
"fuse", length, pobject);
fuse = *pobject;
return ret;
}

29
drivers/gpu/drm/nouveau/nvkm/subdev/fuse/gf100.c
View File

@ -21,63 +21,58 @@
*
* Authors: Martin Peres
*/
#include "priv.h"
struct gf100_fuse_priv {
struct nouveau_fuse base;
struct nvkm_fuse base;
spinlock_t fuse_enable_lock;
};
static u32
gf100_fuse_rd32(struct nouveau_object *object, u64 addr)
gf100_fuse_rd32(struct nvkm_object *object, u64 addr)
{
struct gf100_fuse_priv *priv = (void *)object;
unsigned long flags;
u32 fuse_enable, unk, val;
/* racy if another part of nvkm start writing to these regs */
spin_lock_irqsave(&priv->fuse_enable_lock, flags);
/* racy if another part of nouveau start writing to these regs */
fuse_enable = nv_mask(priv, 0x22400, 0x800, 0x800);
unk = nv_mask(priv, 0x21000, 0x1, 0x1);
val = nv_rd32(priv, 0x21100 + addr);
nv_wr32(priv, 0x21000, unk);
nv_wr32(priv, 0x22400, fuse_enable);
spin_unlock_irqrestore(&priv->fuse_enable_lock, flags);
return val;
}
static int
gf100_fuse_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
struct nouveau_oclass *oclass, void *data, u32 size,
struct nouveau_object **pobject)
gf100_fuse_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
struct nvkm_oclass *oclass, void *data, u32 size,
struct nvkm_object **pobject)
{
struct gf100_fuse_priv *priv;
int ret;
ret = nouveau_fuse_create(parent, engine, oclass, &priv);
ret = nvkm_fuse_create(parent, engine, oclass, &priv);
*pobject = nv_object(priv);
if (ret)
return ret;
spin_lock_init(&priv->fuse_enable_lock);
return 0;
}
struct nouveau_oclass
struct nvkm_oclass
gf100_fuse_oclass = {
.handle = NV_SUBDEV(FUSE, 0xC0),
.ofuncs = &(struct nouveau_ofuncs) {
.ofuncs = &(struct nvkm_ofuncs) {
.ctor = gf100_fuse_ctor,
.dtor = _nouveau_fuse_dtor,
.init = _nouveau_fuse_init,
.fini = _nouveau_fuse_fini,
.dtor = _nvkm_fuse_dtor,
.init = _nvkm_fuse_init,
.fini = _nvkm_fuse_fini,
.rd32 = gf100_fuse_rd32,
},
};

24
drivers/gpu/drm/nouveau/nvkm/subdev/fuse/gm107.c
View File

@ -21,31 +21,29 @@
*
* Authors: Martin Peres
*/
#include "priv.h"
struct gm107_fuse_priv {
struct nouveau_fuse base;
struct nvkm_fuse base;
};
static u32
gm107_fuse_rd32(struct nouveau_object *object, u64 addr)
gm107_fuse_rd32(struct nvkm_object *object, u64 addr)
{
struct gf100_fuse_priv *priv = (void *)object;
return nv_rd32(priv, 0x21100 + addr);
}
static int
gm107_fuse_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
struct nouveau_oclass *oclass, void *data, u32 size,
struct nouveau_object **pobject)
gm107_fuse_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
struct nvkm_oclass *oclass, void *data, u32 size,
struct nvkm_object **pobject)
{
struct gm107_fuse_priv *priv;
int ret;
ret = nouveau_fuse_create(parent, engine, oclass, &priv);
ret = nvkm_fuse_create(parent, engine, oclass, &priv);
*pobject = nv_object(priv);
if (ret)
return ret;
@ -53,14 +51,14 @@ gm107_fuse_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
return 0;
}
struct nouveau_oclass
struct nvkm_oclass
gm107_fuse_oclass = {
.handle = NV_SUBDEV(FUSE, 0x117),
.ofuncs = &(struct nouveau_ofuncs) {
.ofuncs = &(struct nvkm_ofuncs) {
.ctor = gm107_fuse_ctor,
.dtor = _nouveau_fuse_dtor,
.init = _nouveau_fuse_init,
.fini = _nouveau_fuse_fini,
.dtor = _nvkm_fuse_dtor,
.init = _nvkm_fuse_init,
.fini = _nvkm_fuse_fini,
.rd32 = gm107_fuse_rd32,
},
};

41
drivers/gpu/drm/nouveau/nvkm/subdev/fuse/g80.c → drivers/gpu/drm/nouveau/nvkm/subdev/fuse/nv50.c
View File

@ -21,61 +21,56 @@
*
* Authors: Martin Peres
*/
#include "priv.h"
struct g80_fuse_priv {
struct nouveau_fuse base;
struct nv50_fuse_priv {
struct nvkm_fuse base;
spinlock_t fuse_enable_lock;
};
static u32
g80_fuse_rd32(struct nouveau_object *object, u64 addr)
nv50_fuse_rd32(struct nvkm_object *object, u64 addr)
{
struct g80_fuse_priv *priv = (void *)object;
struct nv50_fuse_priv *priv = (void *)object;
unsigned long flags;
u32 fuse_enable, val;
/* racy if another part of nvkm start writing to this reg */
spin_lock_irqsave(&priv->fuse_enable_lock, flags);
/* racy if another part of nouveau start writing to this reg */
fuse_enable = nv_mask(priv, 0x1084, 0x800, 0x800);
val = nv_rd32(priv, 0x21000 + addr);
nv_wr32(priv, 0x1084, fuse_enable);
spin_unlock_irqrestore(&priv->fuse_enable_lock, flags);
return val;
}
static int
g80_fuse_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
struct nouveau_oclass *oclass, void *data, u32 size,
struct nouveau_object **pobject)
nv50_fuse_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
struct nvkm_oclass *oclass, void *data, u32 size,
struct nvkm_object **pobject)
{
struct g80_fuse_priv *priv;
struct nv50_fuse_priv *priv;
int ret;
ret = nouveau_fuse_create(parent, engine, oclass, &priv);
ret = nvkm_fuse_create(parent, engine, oclass, &priv);
*pobject = nv_object(priv);
if (ret)
return ret;
spin_lock_init(&priv->fuse_enable_lock);
return 0;
}
struct nouveau_oclass
g80_fuse_oclass = {
struct nvkm_oclass
nv50_fuse_oclass = {
.handle = NV_SUBDEV(FUSE, 0x50),
.ofuncs = &(struct nouveau_ofuncs) {
.ctor = g80_fuse_ctor,
.dtor = _nouveau_fuse_dtor,
.init = _nouveau_fuse_init,
.fini = _nouveau_fuse_fini,
.rd32 = g80_fuse_rd32,
.ofuncs = &(struct nvkm_ofuncs) {
.ctor = nv50_fuse_ctor,
.dtor = _nvkm_fuse_dtor,
.init = _nvkm_fuse_init,
.fini = _nvkm_fuse_fini,
.rd32 = nv50_fuse_rd32,
},
};

6
drivers/gpu/drm/nouveau/nvkm/subdev/fuse/priv.h
View File

@ -1,9 +1,7 @@
#ifndef __NVKM_FUSE_PRIV_H__
#define __NVKM_FUSE_PRIV_H__
#include <subdev/fuse.h>
int _nouveau_fuse_init(struct nouveau_object *object);
void _nouveau_fuse_dtor(struct nouveau_object *object);
int _nvkm_fuse_init(struct nvkm_object *object);
void _nvkm_fuse_dtor(struct nvkm_object *object);
#endif