ATS

PCIe ATS Moves Address Translation Caching Into the Device

PCIe ATS Moves Address Translation Caching Into the Device An IOMMU can translate DMA addresses on behalf of a device, but that arrangement puts translation machinery in the path of device memory traffic. PCIe Address Translation Services (ATS) adds another option: a capable device can request a translation and retain the result in its own translation cache. Later transactions can carry the translated address instead of requiring the same translation work at the IOMMU for every access.