Function intr_msi_register

freebsd/kern/subr_intr.c:1306–1320

* Register a MSI/MSI-X interrupt controller */

 *  Register a MSI/MSI-X interrupt controller
 */
int
intr_msi_register(device_t dev, intptr_t xref)
{
	struct intr_pic *pic;

	if (dev == NULL)
		return (EINVAL);
	pic = pic_create(dev, xref, FLAG_MSI);
	if (pic == NULL)
		return (ENOMEM);

	debugf("PIC %p registered for %s <dev %p, xref %jx>\n", pic,
	    device_get_nameunit(dev), dev, (uintmax_t)xref);
	return (0);
}

int
intr_alloc_msi(device_t pci, device_t child, intptr_t xref, int count,