iommu_qi_wait_for_seq
iommu_qi_wait_for_seq(iommu, &gseq, true);
iommu_qi_wait_for_seq(DMAR2IOMMU(unit), &gseq, false);
iommu_qi_wait_for_seq(DMAR2IOMMU(unit), &gseq, true);
iommu_qi_wait_for_seq(unit, &gseq, !cansleep);
iommu_qi_wait_for_seq(unit, &gseq, false);
void iommu_qi_wait_for_seq(struct iommu_unit *unit, const struct