1. 根目录:
2. drivers
3. gpu
4. drm
5. nouveau
6. nouveau_ioctl.h

#ifndef __NOUVEAU_IOCTL_H__
#define __NOUVEAU_IOCTL_H__

long nouveau_compat_ioctl(struct file *, unsigned int cmd, unsigned long arg);
long nouveau_drm_ioctl(struct file *, unsigned int cmd, unsigned long arg);

#endif