Method and apparatus for restricting input/output device peer-to-peer operations in a data processing system to improve reliability, availability, and serviceability
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United States of America Patent
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Feb 8, 2011
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app pub date -
Feb 3, 2005
filing date -
Feb 3, 2005
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Abstract
A method and an apparatus are provided for restricting input/output device peer-to-peer operations in a data processing system to improve reliability, availability, and serviceability. A peer-to-peer (P2P) control logic is provided to perform a lookup of P2P lookup table entries. Each P2P lookup table entry comprises bus, device and function number fields, optional control fields, and an accept/reject bit. Upon receiving a communication request from a requesting I/O device, P2P control logic implemented in either a logical bridge or an I/O device identifies the requester ID of the request and determines if a match exists in the P2P lookup table entries. If a match is found and the accept/reject bit is enabled, I/O operations can be received from the requester.
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