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AssigneeInternational Business Machines Corporation
InventorsBruce Leroy Beukema, Richard Charles Booth, David Robert Engebretsen, Thomas Rembert Sand, Kenneth Michael Valk
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A clustered computer system, bridge device and method include support for an atomic ownership change operation that ensures orderly and reliable ownership management of an input/output (I/O) bridge device. A lock indicator is associated with a bridge device, and is used to indicate a “locked” or “unlocked” status of the bridge device. Whenever the lock indicator indicates that the bridge device is unlocked, an atomic operation such as a read request to a lock indicator register is utilized to both set the indicator to indicate a locked status for the bridge device, and to associate the bridge device with a source node that initiated the atomic operation. In connection with the lock indicator, write access to one or more configuration parameter registers is controlled such that only the node that is associated with the bridge device is permitted to update such configuration parameter registers.
A method of processing access requests in an input/output (I/O) bridge device in a clustered computer system, the method comprising:
A method of obtaining ownership of a input/output (I/O) bridge device in a clustered computer system, the method comprising:
An input/output (I/O) bridge device for use in a clustered computer system, the bridge device comprising:
A clustered computer system, comprising:
A program product, the program product comprising:
Dependencies are inferred from the claim text.