Function tegra_pcib_alloc_msi

freebsd/arm/nvidia/tegra_pcie.c:532–545

----------------------------------------------------------------------- * * PCI MSI interface */

 * 	PCI MSI interface
 */
static int
tegra_pcib_alloc_msi(device_t pci, device_t child, int count, int maxcount,
    int *irqs)
{
	phandle_t msi_parent;

	/* XXXX ofw_bus_msimap() don't works for Tegra DT.
	ofw_bus_msimap(ofw_bus_get_node(pci), pci_get_rid(child), &msi_parent,
	    NULL);
	*/
	msi_parent = OF_xref_from_node(ofw_bus_get_node(pci));
	return (intr_alloc_msi(pci, child, msi_parent, count, maxcount,
	    irqs));
}

static int
tegra_pcib_release_msi(device_t pci, device_t child, int count, int *irqs)