Providing indirect data addressing for a control block at a channel subsystem of an I/O processing system

An computer program product, apparatus, and method for facilitating input/output (I/O) processing for an I/O operation at a host computer system configured for communication with a control unit. The computer program product is provided for performing a method including: sending a transport command w...

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Bibliographic Details
Main Authors HUANG CATHERINE C, RIEDY DALE F, NJOKU UGOCHUKWU C, CASPER DANIEL F, FLANAGAN JOHN R, KALOS MATTHEW J, SITTMANN, III GUSTAV E
Format Patent
LanguageEnglish
Published 22.03.2016
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:An computer program product, apparatus, and method for facilitating input/output (I/O) processing for an I/O operation at a host computer system configured for communication with a control unit. The computer program product is provided for performing a method including: sending a transport command word (TCW) to an I/O subsystem, the TCW specifying a location address and indicating whether the TCW directly or indirectly addresses a message; extracting the location address from the TCW; obtaining the message from the specified location address based on the TCW indicating direct addressing, the message including the one or more I/O commands; gathering the one or more I/O commands from command locations specified by a list of addresses identified by the specified location address to form the message based on the TCW indicating indirect addressing; and generating a message including the one or more I/O commands.
Bibliography:Application Number: US201414304383