static long vfio_platform_ioctl()

in platform/vfio_platform_common.c [277:384]

• 76 lines of code
• 22 McCabe index (conditional complexity)

static long vfio_platform_ioctl(struct vfio_device *core_vdev,
				unsigned int cmd, unsigned long arg)
{
	struct vfio_platform_device *vdev =
		container_of(core_vdev, struct vfio_platform_device, vdev);

	unsigned long minsz;

	if (cmd == 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;

		if (vfio_platform_has_reset(vdev))
			vdev->flags |= VFIO_DEVICE_FLAGS_RESET;
		info.flags = vdev->flags;
		info.num_regions = vdev->num_regions;
		info.num_irqs = vdev->num_irqs;

		return copy_to_user((void __user *)arg, &info, minsz) ?
			-EFAULT : 0;

	} else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
		struct vfio_region_info info;

		minsz = offsetofend(struct vfio_region_info, offset);

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

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

		if (info.index >= vdev->num_regions)
			return -EINVAL;

		/* map offset to the physical address  */
		info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index);
		info.size = vdev->regions[info.index].size;
		info.flags = vdev->regions[info.index].flags;

		return copy_to_user((void __user *)arg, &info, minsz) ?
			-EFAULT : 0;

	} else if (cmd == 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)
			return -EINVAL;

		if (info.index >= vdev->num_irqs)
			return -EINVAL;

		info.flags = vdev->irqs[info.index].flags;
		info.count = vdev->irqs[info.index].count;

		return copy_to_user((void __user *)arg, &info, minsz) ?
			-EFAULT : 0;

	} else if (cmd == VFIO_DEVICE_SET_IRQS) {
		struct vfio_irq_set hdr;
		u8 *data = NULL;
		int ret = 0;
		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, vdev->num_irqs,
						 vdev->num_irqs, &data_size);
		if (ret)
			return ret;

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

		mutex_lock(&vdev->igate);

		ret = vfio_platform_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
						   hdr.start, hdr.count, data);
		mutex_unlock(&vdev->igate);
		kfree(data);

		return ret;

	} else if (cmd == VFIO_DEVICE_RESET) {
		return vfio_platform_call_reset(vdev, NULL);
	}

	return -ENOTTY;
}