drm_irq_busid
static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
struct drm_irq_busid *p = data;
typedef struct drm_irq_busid drm_irq_busid_t;
#define DRM_IOCTL_IRQ_BUSID DRM_IOWR(0x03, struct drm_irq_busid)