MEM_EVENT_RING
iova = uaudio_iommu_map_pa(MEM_EVENT_RING, dma_coherent, er_pa,
uaudio_iommu_unmap(MEM_EVENT_RING, IOVA_BASE, PAGE_SIZE, PAGE_SIZE);
case MEM_EVENT_RING:
case MEM_EVENT_RING:
uaudio_iommu_unmap(MEM_EVENT_RING, IOVA_BASE, PAGE_SIZE,