Quality of service for input/output memory management unit

A data processing system, comprising:

• a plurality of input/output devices;
• an input/output memory management unit (IOMMU) coupled to the plurality of input/output devices and having a plurality of hardware resources that the IOMMU uses to translate virtual addresses received from the plurality of input/output devices to physical addresses, and a high priority queue and a low priority queue coupled to the plurality of hardware resources, wherein the IOMMU:
• assigns each of the plurality of input/output devices to a corresponding one of the high priority queue and the low priority queue based on predetermined memory access needs of the corresponding ones of the plurality of input/output devices;
• and
• in response to receiving an address translation request from a first input/output device, uses an assigned one of the high priority queue and the low priority queue to dispatch the address translation request to one of the plurality of hardware resources, wherein the IOMMU allocates address translation requests from the high priority queue to the plurality of hardware resources in preference to address translation requests from the low priority queue.

A method for generating a physical address in response to an address translation request in an input/output memory management unit (IOMMU), comprising:

• receiving address translation requests from a plurality of input/output devices;
• statically allocating percentages of a plurality of hardware resources to corresponding ones of the plurality of input/output devices based on predetermined memory access needs of the corresponding ones of the plurality of input/output devices, wherein statically allocating comprises allocating a first percentage of the plurality of hardware resources to a first input/output device;
• and
• receiving a first address translation request from the first input/output device;
• and
• using the first percentage of the plurality of hardware resources allocated to the first input/output device to translate a first virtual address of the first address translation request to a first physical address.