nvif_head
int nvif_head_ctor(struct nvif_disp *, const char *name, int id, struct nvif_head *);
void nvif_head_dtor(struct nvif_head *);
nvif_head_id(struct nvif_head *head)
int nvif_head_vblank_event_ctor(struct nvif_head *, const char *name, nvif_event_func, bool wait,
struct nvif_head head;
struct nvif_head *head = &nouveau_crtc(crtc)->head;
nvif_head_vblank_event_ctor(struct nvif_head *head, const char *name, nvif_event_func func,
nvif_head_dtor(struct nvif_head *head)
nvif_head_ctor(struct nvif_disp *disp, const char *name, int id, struct nvif_head *head)