static long vfio_fsl_mc_ioctl()

in fsl-mc/vfio_fsl_mc.c [120:238]

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

static long vfio_fsl_mc_ioctl(struct vfio_device *core_vdev,
			      unsigned int cmd, unsigned long arg)
{
	unsigned long minsz;
	struct vfio_fsl_mc_device *vdev =
		container_of(core_vdev, struct vfio_fsl_mc_device, vdev);
	struct fsl_mc_device *mc_dev = vdev->mc_dev;

	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;

		info.flags = VFIO_DEVICE_FLAGS_FSL_MC;

		if (is_fsl_mc_bus_dprc(mc_dev))
			info.flags |= VFIO_DEVICE_FLAGS_RESET;

		info.num_regions = mc_dev->obj_desc.region_count;
		info.num_irqs = mc_dev->obj_desc.irq_count;

		return copy_to_user((void __user *)arg, &info, minsz) ?
			-EFAULT : 0;
	}
	case 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 >= mc_dev->obj_desc.region_count)
			return -EINVAL;

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

		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)
			return -EINVAL;

		if (info.index >= mc_dev->obj_desc.irq_count)
			return -EINVAL;

		info.flags = VFIO_IRQ_INFO_EVENTFD;
		info.count = 1;

		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;
		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, mc_dev->obj_desc.irq_count,
					mc_dev->obj_desc.irq_count, &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_fsl_mc_set_irqs_ioctl(vdev, hdr.flags,
						 hdr.index, hdr.start,
						 hdr.count, data);
		mutex_unlock(&vdev->igate);
		kfree(data);

		return ret;
	}
	case VFIO_DEVICE_RESET:
	{
		return vfio_fsl_mc_reset_device(vdev);

	}
	default:
		return -ENOTTY;
	}
}