__pci_enable_msi_range
nvecs = __pci_enable_msi_range(dev, min_vecs, max_vecs, affd);
int rc = __pci_enable_msi_range(dev, 1, 1, NULL);
int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec, struct irq_affinity *affd);