ANS_NVMMU_TCB_SIZE
KASSERT(q->q_entries <= (ANS_NVMMU_TCB_SIZE / ANS_NVMMU_TCB_PITCH));
q->q_nvmmu_dmamem = nvme_dmamem_alloc(sc, ANS_NVMMU_TCB_SIZE);
(ANS_NVMMU_TCB_SIZE / ANS_NVMMU_TCB_PITCH) - 1);