Communicating with an I/O device using a queue data structure and pre-translated addresses
US7590817B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2006 |
| Grant date | Sep 15, 2009 |
| Priority date | — |
| Expiry date | Sep 25, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F12/1081
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Mechanisms for communicating with an I/O device or endpoint using a queue data structure and pre-translated addresses associated with the queue data structure are provided. With the mechanisms, a device driver invokes device driver services for initializing address translation and protection table (ATPT) entries in a root complex for the queue data structure. The device driver services return untranslated addresses to the device driver which are in turn provided to the I/O device or endpoint. The I/O device or endpoint may then request a translation of these untranslated addresses and store them in the I/O device or endpoint prior to receiving an I/O operation targeting the queue data structure. The cached translation may be used to directly access the queue data structure from the I/O device or endpoint by bypassing the root complex's address translation facilities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.