[PATCH v4 3/4] uio_pci_generic: add MSI/MSI-X support

Add support for MSI and MSI-X interrupt modes: - Interrupt mode selection order is: INT#X (for backward compatibility) -> MSI-X -> MSI. - Add ioctl() commands: - UIO_PCI_GENERIC_INT_MODE_GET: query the current interrupt mode. - UIO_PCI_GENERIC_IRQ_NUM_GET: query the

[PATCH v4 3/4] uio_pci_generic: add MSI/MSI-X support

Add support for MSI and MSI-X interrupt modes: - Interrupt mode selection order is: INT#X (for backward compatibility) -> MSI-X -> MSI. - Add ioctl() commands: - UIO_PCI_GENERIC_INT_MODE_GET: query the current interrupt mode. - UIO_PCI_GENERIC_IRQ_NUM_GET: query the