PCI_BAR_2
qm->phys_base = pci_resource_start(pdev, PCI_BAR_2);
qm->io_base = ioremap(qm->phys_base, pci_resource_len(pdev, PCI_BAR_2));
ret = pcim_iomap_regions(pdev, 1 << PCI_BAR_2, pci_name(pdev));
hdma_dev->base = pcim_iomap_table(pdev)[PCI_BAR_2];