DMA_TLB_GLOBAL_FLUSH
DMA_TLB_GLOBAL_FLUSH);
iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);
case DMA_TLB_GLOBAL_FLUSH:
val = DMA_TLB_GLOBAL_FLUSH|DMA_TLB_IVT;
iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH);