DMA Address Translation in an IOMMU

A system comprising:

• a memory system storing a device table and one or more input/output (I/O) page tables during use;
• a least one I/O device configured to generate a memory request;
• an I/O memory management unit (IOMMU) coupled to the I/O device and to the memory system, wherein the IOMMU is configured to translate the memory request using translation data, and wherein the translation data corresponds to:
• (i) one or more device table entries in the device table, wherein the device table entry for a given request is selected by an identifier corresponding to the I/O device;
• and (ii) one or more I/O page tables, wherein the selected device table entry for the given request includes a pointer to a set of I/O page tables to be used to translate the given request.

A method comprising:

• receiving an input/output (I/O) device-generated memory request in an IOMMU;
• determining a device table entry corresponding to the memory request by the IOMMU;
• determining a set of I/O page tables corresponding to the memory request responsive to the device table entry;
• and
• translating the memory request using translation data corresponding to the device table entry and the set of I/O page tables.