Function dmar_domain_alloc

freebsd/x86/iommu/intel_ctx.c:380–438

}

static struct dmar_domain *
dmar_domain_alloc(struct dmar_unit *dmar, bool id_mapped)
{
	struct iommu_domain *iodom;
	struct iommu_unit *unit;
	struct dmar_domain *domain;
	int error, id, mgaw;

	id = alloc_unr(dmar->domids);
	if (id == -1)
		return (NULL);
	domain = malloc(sizeof(*domain), M_DMAR_DOMAIN, M_WAITOK | M_ZERO);
	iodom = DOM2IODOM(domain);
	unit = DMAR2IOMMU(dmar);
	domain->domain = id;
	LIST_INIT(&domain->contexts);
	iommu_domain_init(unit, iodom, &dmar_domain_map_ops);

	domain->dmar = dmar;

	/*
	 * For now, use the maximal usable physical address of the
	 * installed memory to calculate the mgaw on id_mapped domain.
	 * It is useful for the identity mapping, and less so for the
	 * virtualized bus address space.
	 */
	domain->iodom.end = id_mapped ? ptoa(Maxmem) : BUS_SPACE_MAXADDR;
	mgaw = dmar_maxaddr2mgaw(dmar, domain->iodom.end, !id_mapped);
	error = domain_set_agaw(domain, mgaw);
	if (error != 0)
		goto fail;
	if (!id_mapped)
		/* Use all supported address space for remapping. */
		domain->iodom.end = 1ULL << (domain->agaw - 1);

	iommu_gas_init_domain(DOM2IODOM(domain));

	if (id_mapped) {
		if ((dmar->hw_ecap & DMAR_ECAP_PT) == 0) {
			domain->pgtbl_obj = domain_get_idmap_pgtbl(domain,
			    domain->iodom.end);
		}
		domain->iodom.flags |= IOMMU_DOMAIN_IDMAP;
	} else {
		error = domain_alloc_pgtbl(domain);
		if (error != 0)
			goto fail;
		/* Disable local apic region access */
		error = iommu_gas_reserve_region(iodom, 0xfee00000,
		    0xfeefffff + 1, &iodom->msi_entry);
		if (error != 0)
			goto fail;
	}
	return (domain);

fail:
	dmar_domain_destroy(domain);
	return (NULL);