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System and program products for facilitating access to status and measurement data associated with input/output processing

  • US 7,984,198 B2
  • Filed: 02/03/2009
  • Issued: 07/19/2011
  • Est. Priority Date: 10/10/2006
  • Status: Expired due to Fees
First Claim
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1. A system of facilitating input/output processing of a processing environment, said system comprising:

  • an input/output communications adapter of the processing environment to obtain a transport control word, said transport control word including a count of the total amount of data being transferred, an address of a descriptor control block to be sent to a control unit of the processing environment, in which the descriptor control block includes a plurality of input/output commands to be executed, an address of a list that informs the input/output communications adapter where to store or fetch data received from or transmitted to the control unit, and a location in memory where to store ending status from the control unit, said ending status being directly accessible by an operating system of the processing environment; and

    said input/output communications adapter to forward to the control unit, in a single communication, the descriptor control block that includes the plurality of input/output commands as one entity, the control unit to execute the plurality of input/output commands to perform one or more input/output operations, wherein the executing is performed absent a tracking by the input/output communications adapter of state relative to the individual input/output commands of the plurality of input/output commands being executed by the control unit.

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