static int mtty_set_irqs()

in vfio-mdev/mtty.c [900:991]

• 84 lines of code
• 23 McCabe index (conditional complexity)

static int mtty_set_irqs(struct mdev_state *mdev_state, uint32_t flags,
			 unsigned int index, unsigned int start,
			 unsigned int count, void *data)
{
	int ret = 0;

	mutex_lock(&mdev_state->ops_lock);
	switch (index) {
	case VFIO_PCI_INTX_IRQ_INDEX:
		switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
		case VFIO_IRQ_SET_ACTION_MASK:
		case VFIO_IRQ_SET_ACTION_UNMASK:
			break;
		case VFIO_IRQ_SET_ACTION_TRIGGER:
		{
			if (flags & VFIO_IRQ_SET_DATA_NONE) {
				pr_info("%s: disable INTx\n", __func__);
				if (mdev_state->intx_evtfd)
					eventfd_ctx_put(mdev_state->intx_evtfd);
				break;
			}

			if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
				int fd = *(int *)data;

				if (fd > 0) {
					struct eventfd_ctx *evt;

					evt = eventfd_ctx_fdget(fd);
					if (IS_ERR(evt)) {
						ret = PTR_ERR(evt);
						break;
					}
					mdev_state->intx_evtfd = evt;
					mdev_state->irq_fd = fd;
					mdev_state->irq_index = index;
					break;
				}
			}
			break;
		}
		}
		break;
	case VFIO_PCI_MSI_IRQ_INDEX:
		switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
		case VFIO_IRQ_SET_ACTION_MASK:
		case VFIO_IRQ_SET_ACTION_UNMASK:
			break;
		case VFIO_IRQ_SET_ACTION_TRIGGER:
			if (flags & VFIO_IRQ_SET_DATA_NONE) {
				if (mdev_state->msi_evtfd)
					eventfd_ctx_put(mdev_state->msi_evtfd);
				pr_info("%s: disable MSI\n", __func__);
				mdev_state->irq_index = VFIO_PCI_INTX_IRQ_INDEX;
				break;
			}
			if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
				int fd = *(int *)data;
				struct eventfd_ctx *evt;

				if (fd <= 0)
					break;

				if (mdev_state->msi_evtfd)
					break;

				evt = eventfd_ctx_fdget(fd);
				if (IS_ERR(evt)) {
					ret = PTR_ERR(evt);
					break;
				}
				mdev_state->msi_evtfd = evt;
				mdev_state->irq_fd = fd;
				mdev_state->irq_index = index;
			}
			break;
	}
	break;
	case VFIO_PCI_MSIX_IRQ_INDEX:
		pr_info("%s: MSIX_IRQ\n", __func__);
		break;
	case VFIO_PCI_ERR_IRQ_INDEX:
		pr_info("%s: ERR_IRQ\n", __func__);
		break;
	case VFIO_PCI_REQ_IRQ_INDEX:
		pr_info("%s: REQ_IRQ\n", __func__);
		break;
	}

	mutex_unlock(&mdev_state->ops_lock);
	return ret;
}