iommu_is_buswide_ctx
if (iommu_is_buswide_ctx(iodom->iommu, pci_get_bus(ctx->dev)))
bool iommu_is_buswide_ctx(struct iommu_unit *unit, u_int busno);
if (iommu_is_buswide_ctx(AMD2IOMMU(unit),
KASSERT(!iommu_is_buswide_ctx(AMD2IOMMU(unit), bus) ||
if (iommu_is_buswide_ctx(DMAR2IOMMU(unit), busno)) {
KASSERT(!iommu_is_buswide_ctx(unit, bus) || (slot == 0 && func == 0),