drm_lock
#define DRM_IOCTL_LOCK DRM_IOW( 0x2a, struct drm_lock)
#define DRM_IOCTL_UNLOCK DRM_IOW( 0x2b, struct drm_lock)
#define DRM_IOCTL_FINISH DRM_IOW( 0x2c, struct drm_lock)
typedef struct drm_lock drm_lock_t;
extern int drm_lock(struct drm_device *dev, void *data,
DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_lock, DRM_AUTH),
struct drm_lock *lock = data;
struct drm_lock *lock = data;