Facilitating transport mode input/output operations between a channel subsystem and input/output devices
First Claim
1. A computer program product for performing an input/output (I/O) operation initiated by an I/O operation instruction at a host computer system configured for communication with a control unit, the computer program product comprising:
- a non-transitory machine-readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising;
obtaining a transport command word (TCW) at a channel subsystem in the host computer system for an I/O operation, the TCW including a transport command control block (TCCB) address field for locating at least one address of a TCCB, the TCCB including a transport command area (TCA) configured to hold a first plurality of device command words (DCWs) and control data associated with respective DCWs, the first plurality of DCWs including a transfer TCA extension (TTE) DCW that specifies a TCA extension, the TCA extension configured to hold one or more DCWs and control data associated with respective DCWs;
gathering the TCCB from one or more locations specified in the TCCB address field and transferring the TCCB to the control unit;
gathering the TCA extension specified by the TTE DCW; and
transferring the TCA extension to the control unit.
1 Assignment
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Accused Products
Abstract
A computer program product is provided for performing an input/output (I/O) processing operation at a host computer system. The computer program product is configured to perform: obtaining a transport command word (TCW) at a channel subsystem for an I/O operation, the TCW including an address of a transport command control block (TCCB) having a transport command area (TCA) configured to hold a first plurality of device command words (DCW) and control data associated with respective DCWs, the first plurality of DCWs including a transfer TCA extension (TTE) DCW that specifies a TCA extension, the TCA extension configured to hold one or more DCWs and control data associated with respective DCWs; gathering the TCCB from one or more locations specified in the TCCB address and transferring the TCCB to the control unit; gathering the TCA extension specified by the TTE DCW; and transferring the TCA extension to the control unit.
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Citations
24 Claims
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1. A computer program product for performing an input/output (I/O) operation initiated by an I/O operation instruction at a host computer system configured for communication with a control unit, the computer program product comprising:
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a non-transitory machine-readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising; obtaining a transport command word (TCW) at a channel subsystem in the host computer system for an I/O operation, the TCW including a transport command control block (TCCB) address field for locating at least one address of a TCCB, the TCCB including a transport command area (TCA) configured to hold a first plurality of device command words (DCWs) and control data associated with respective DCWs, the first plurality of DCWs including a transfer TCA extension (TTE) DCW that specifies a TCA extension, the TCA extension configured to hold one or more DCWs and control data associated with respective DCWs; gathering the TCCB from one or more locations specified in the TCCB address field and transferring the TCCB to the control unit; gathering the TCA extension specified by the TTE DCW; and transferring the TCA extension to the control unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for performing an input/output (I/O) operation initiated by an I/O operation instruction at a host computer system configured for communication with a control unit, the host computer system configured to perform:
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obtaining a transport command word (TCW) at a channel subsystem in the host computer system for an I/O operation, the TCW including a transport command control block (TCCB) address field for locating at least one address of a TCCB, the TCCB including a transport command area (TCA) configured to hold a first plurality of device command words (DCWs) and control data associated with respective DCWs, the first plurality of DCWs including a transfer TCA extension (TTE) DCW that specifies a TCA extension, the TCA extension configured to hold one or more DCWs and control data associated with respective DCWs; gathering the TCCB from one or more locations specified in the TCCB address field and transferring the TCCB to the control unit; gathering the TCA extension specified by the TTE DCW; and transferring the TCA extension to the control unit. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of performing an input/output (I/O) operation initiated by an I/O operation instruction at a host computer system configured for communication with a control unit, the method comprising:
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obtaining a transport command word (TCW) at a channel subsystem in the host computer system for an I/O operation, the TCW including a transport command control block (TCCB) address field for locating at least one address of a TCCB, the TCCB including a transport command area (TCA) configured to hold a first plurality of device command words (DCWs) and control data associated with respective DCWs, the first plurality of DCWs including a transfer TCA extension (TTE) DCW that specifies a TCA extension, the TCA extension configured to hold one or more DCWs and control data associated with respective DCWs; gathering the TCCB from one or more locations specified in the TCCB address field and transferring the TCCB to the control unit; gathering the TCA extension specified by the TTE DCW; and transferring the TCA extension to the control unit. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification