Function its_device_get

freebsd/arm64/arm64/gicv3_its.c:1136–1193

}

static struct its_dev *
its_device_get(device_t dev, device_t child, u_int nvecs)
{
	struct gicv3_its_softc *sc;
	struct its_dev *its_dev;
	vmem_addr_t irq_base;
	size_t esize;

	sc = device_get_softc(dev);

	its_dev = its_device_find(dev, child);
	if (its_dev != NULL)
		return (its_dev);

	its_dev = malloc(sizeof(*its_dev), M_GICV3_ITS, M_NOWAIT | M_ZERO);
	if (its_dev == NULL)
		return (NULL);

	its_dev->pci_dev = child;
	its_dev->devid = its_get_devid(child);

	its_dev->lpis.lpi_busy = 0;
	its_dev->lpis.lpi_num = nvecs;
	its_dev->lpis.lpi_free = nvecs;

	if (vmem_alloc(sc->sc_irq_alloc, nvecs, M_FIRSTFIT | M_NOWAIT,
	    &irq_base) != 0) {
		free(its_dev, M_GICV3_ITS);
		return (NULL);
	}
	its_dev->lpis.lpi_base = irq_base;

	/* Get ITT entry size */
	esize = GITS_TYPER_ITTES(gic_its_read_8(sc, GITS_TYPER));

	/*
	 * Allocate ITT for this device.
	 * PA has to be 256 B aligned. At least two entries for device.
	 */
	its_dev->itt_size = roundup2(MAX(nvecs, 2) * esize, 256);
	its_dev->itt = (vm_offset_t)contigmalloc(its_dev->itt_size,
	    M_GICV3_ITS, M_NOWAIT | M_ZERO, 0, LPI_INT_TRANS_TAB_MAX_ADDR,
	    LPI_INT_TRANS_TAB_ALIGN, 0);
	if (its_dev->itt == 0) {
		vmem_free(sc->sc_irq_alloc, its_dev->lpis.lpi_base, nvecs);
		free(its_dev, M_GICV3_ITS);
		return (NULL);
	}

	mtx_lock_spin(&sc->sc_its_dev_lock);
	TAILQ_INSERT_TAIL(&sc->sc_its_dev_list, its_dev, entry);
	mtx_unlock_spin(&sc->sc_its_dev_lock);

	/* Map device to its ITT */
	its_cmd_mapd(dev, its_dev, 1);

	return (its_dev);
}