long vfio_spapr_iommu_eeh_ioctl()

in vfio_spapr_eeh.c [31:101]

• 66 lines of code
• 21 McCabe index (conditional complexity)

long vfio_spapr_iommu_eeh_ioctl(struct iommu_group *group,
				unsigned int cmd, unsigned long arg)
{
	struct eeh_pe *pe;
	struct vfio_eeh_pe_op op;
	unsigned long minsz;
	long ret = -EINVAL;

	switch (cmd) {
	case VFIO_CHECK_EXTENSION:
		if (arg == VFIO_EEH)
			ret = eeh_enabled() ? 1 : 0;
		else
			ret = 0;
		break;
	case VFIO_EEH_PE_OP:
		pe = eeh_iommu_group_to_pe(group);
		if (!pe)
			return -ENODEV;

		minsz = offsetofend(struct vfio_eeh_pe_op, op);
		if (copy_from_user(&op, (void __user *)arg, minsz))
			return -EFAULT;
		if (op.argsz < minsz || op.flags)
			return -EINVAL;

		switch (op.op) {
		case VFIO_EEH_PE_DISABLE:
			ret = eeh_pe_set_option(pe, EEH_OPT_DISABLE);
			break;
		case VFIO_EEH_PE_ENABLE:
			ret = eeh_pe_set_option(pe, EEH_OPT_ENABLE);
			break;
		case VFIO_EEH_PE_UNFREEZE_IO:
			ret = eeh_pe_set_option(pe, EEH_OPT_THAW_MMIO);
			break;
		case VFIO_EEH_PE_UNFREEZE_DMA:
			ret = eeh_pe_set_option(pe, EEH_OPT_THAW_DMA);
			break;
		case VFIO_EEH_PE_GET_STATE:
			ret = eeh_pe_get_state(pe);
			break;
		case VFIO_EEH_PE_RESET_DEACTIVATE:
			ret = eeh_pe_reset(pe, EEH_RESET_DEACTIVATE, true);
			break;
		case VFIO_EEH_PE_RESET_HOT:
			ret = eeh_pe_reset(pe, EEH_RESET_HOT, true);
			break;
		case VFIO_EEH_PE_RESET_FUNDAMENTAL:
			ret = eeh_pe_reset(pe, EEH_RESET_FUNDAMENTAL, true);
			break;
		case VFIO_EEH_PE_CONFIGURE:
			ret = eeh_pe_configure(pe);
			break;
		case VFIO_EEH_PE_INJECT_ERR:
			minsz = offsetofend(struct vfio_eeh_pe_op, err.mask);
			if (op.argsz < minsz)
				return -EINVAL;
			if (copy_from_user(&op, (void __user *)arg, minsz))
				return -EFAULT;

			ret = eeh_pe_inject_err(pe, op.err.type, op.err.func,
						op.err.addr, op.err.mask);
			break;
		default:
			ret = -EINVAL;
		}
	}

	return ret;
}