int vfio_pci_set_irqs_ioctl()

in pci/vfio_pci_intrs.c [638:693]

• 52 lines of code
• 16 McCabe index (conditional complexity)

int vfio_pci_set_irqs_ioctl(struct vfio_pci_core_device *vdev, uint32_t flags,
			    unsigned index, unsigned start, unsigned count,
			    void *data)
{
	int (*func)(struct vfio_pci_core_device *vdev, unsigned index,
		    unsigned start, unsigned count, uint32_t flags,
		    void *data) = NULL;

	switch (index) {
	case VFIO_PCI_INTX_IRQ_INDEX:
		switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
		case VFIO_IRQ_SET_ACTION_MASK:
			func = vfio_pci_set_intx_mask;
			break;
		case VFIO_IRQ_SET_ACTION_UNMASK:
			func = vfio_pci_set_intx_unmask;
			break;
		case VFIO_IRQ_SET_ACTION_TRIGGER:
			func = vfio_pci_set_intx_trigger;
			break;
		}
		break;
	case VFIO_PCI_MSI_IRQ_INDEX:
	case VFIO_PCI_MSIX_IRQ_INDEX:
		switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
		case VFIO_IRQ_SET_ACTION_MASK:
		case VFIO_IRQ_SET_ACTION_UNMASK:
			/* XXX Need masking support exported */
			break;
		case VFIO_IRQ_SET_ACTION_TRIGGER:
			func = vfio_pci_set_msi_trigger;
			break;
		}
		break;
	case VFIO_PCI_ERR_IRQ_INDEX:
		switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
		case VFIO_IRQ_SET_ACTION_TRIGGER:
			if (pci_is_pcie(vdev->pdev))
				func = vfio_pci_set_err_trigger;
			break;
		}
		break;
	case VFIO_PCI_REQ_IRQ_INDEX:
		switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
		case VFIO_IRQ_SET_ACTION_TRIGGER:
			func = vfio_pci_set_req_trigger;
			break;
		}
		break;
	}

	if (!func)
		return -ENOTTY;

	return func(vdev, index, start, count, flags, data);
}