pci_enable_pasid
ret = pci_enable_pasid(pdev, 0);
ret = pci_enable_pasid(pdev, features);
!pci_enable_pasid(to_pci_dev(dev), info->pasid_supported & ~1))
EXPORT_SYMBOL_GPL(pci_enable_pasid);
int pci_enable_pasid(struct pci_dev *pdev, int features);