RISCV_IOMMU_QUEUE_LOG2SZ_FIELD
#define RISCV_IOMMU_CQB_ENTRIES RISCV_IOMMU_QUEUE_LOG2SZ_FIELD
#define RISCV_IOMMU_FQB_ENTRIES RISCV_IOMMU_QUEUE_LOG2SZ_FIELD
#define RISCV_IOMMU_PQB_ENTRIES RISCV_IOMMU_QUEUE_LOG2SZ_FIELD
riscv_iommu_writeq(iommu, queue->qbr, RISCV_IOMMU_QUEUE_LOG2SZ_FIELD);
if (logsz > FIELD_GET(RISCV_IOMMU_QUEUE_LOG2SZ_FIELD, qb))
logsz = FIELD_GET(RISCV_IOMMU_QUEUE_LOG2SZ_FIELD, qb);
FIELD_PREP(RISCV_IOMMU_QUEUE_LOG2SZ_FIELD, logsz);