static long mtty_ioctl()

in vfio-mdev/mtty.c [1094:1208]

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

static long mtty_ioctl(struct vfio_device *vdev, unsigned int cmd,
			unsigned long arg)
{
	struct mdev_state *mdev_state =
		container_of(vdev, struct mdev_state, vdev);
	int ret = 0;
	unsigned long minsz;

	switch (cmd) {
	case VFIO_DEVICE_GET_INFO:
	{
		struct vfio_device_info info;

		minsz = offsetofend(struct vfio_device_info, num_irqs);

		if (copy_from_user(&info, (void __user *)arg, minsz))
			return -EFAULT;

		if (info.argsz < minsz)
			return -EINVAL;

		ret = mtty_get_device_info(&info);
		if (ret)
			return ret;

		memcpy(&mdev_state->dev_info, &info, sizeof(info));

		if (copy_to_user((void __user *)arg, &info, minsz))
			return -EFAULT;

		return 0;
	}
	case VFIO_DEVICE_GET_REGION_INFO:
	{
		struct vfio_region_info info;
		u16 cap_type_id = 0;
		void *cap_type = NULL;

		minsz = offsetofend(struct vfio_region_info, offset);

		if (copy_from_user(&info, (void __user *)arg, minsz))
			return -EFAULT;

		if (info.argsz < minsz)
			return -EINVAL;

		ret = mtty_get_region_info(mdev_state, &info, &cap_type_id,
					   &cap_type);
		if (ret)
			return ret;

		if (copy_to_user((void __user *)arg, &info, minsz))
			return -EFAULT;

		return 0;
	}

	case VFIO_DEVICE_GET_IRQ_INFO:
	{
		struct vfio_irq_info info;

		minsz = offsetofend(struct vfio_irq_info, count);

		if (copy_from_user(&info, (void __user *)arg, minsz))
			return -EFAULT;

		if ((info.argsz < minsz) ||
		    (info.index >= mdev_state->dev_info.num_irqs))
			return -EINVAL;

		ret = mtty_get_irq_info(&info);
		if (ret)
			return ret;

		if (copy_to_user((void __user *)arg, &info, minsz))
			return -EFAULT;

		return 0;
	}
	case VFIO_DEVICE_SET_IRQS:
	{
		struct vfio_irq_set hdr;
		u8 *data = NULL, *ptr = NULL;
		size_t data_size = 0;

		minsz = offsetofend(struct vfio_irq_set, count);

		if (copy_from_user(&hdr, (void __user *)arg, minsz))
			return -EFAULT;

		ret = vfio_set_irqs_validate_and_prepare(&hdr,
						mdev_state->dev_info.num_irqs,
						VFIO_PCI_NUM_IRQS,
						&data_size);
		if (ret)
			return ret;

		if (data_size) {
			ptr = data = memdup_user((void __user *)(arg + minsz),
						 data_size);
			if (IS_ERR(data))
				return PTR_ERR(data);
		}

		ret = mtty_set_irqs(mdev_state, hdr.flags, hdr.index, hdr.start,
				    hdr.count, data);

		kfree(ptr);
		return ret;
	}
	case VFIO_DEVICE_RESET:
		return mtty_reset(mdev_state);
	}
	return -ENOTTY;
}