drm_ioctl
ret = drm_ioctl(filp, cmd, arg);
.d_ioctl = drm_ioctl,
EXPORT_SYMBOL(drm_ioctl);
.unlocked_ioctl = drm_ioctl,
.unlocked_ioctl = drm_ioctl,\
.unlocked_ioctl = drm_ioctl,\
d_ioctl_t drm_ioctl;
ret = drm_ioctl(filp, cmd, arg);