WO2009101058A4 - Processing a variable length device command word at a control unit in an i/o processing system - Google Patents

Processing a variable length device command word at a control unit in an i/o processing system Download PDF

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Publication number
WO2009101058A4
WO2009101058A4 PCT/EP2009/051463 EP2009051463W WO2009101058A4 WO 2009101058 A4 WO2009101058 A4 WO 2009101058A4 EP 2009051463 W EP2009051463 W EP 2009051463W WO 2009101058 A4 WO2009101058 A4 WO 2009101058A4
Authority
WO
WIPO (PCT)
Prior art keywords
dcw
subsystem
control data
customer data
data count
Prior art date
Application number
PCT/EP2009/051463
Other languages
French (fr)
Other versions
WO2009101058A1 (en
Inventor
Daniel Casper
John Flanagan
Matthew Kalos
Catherine Huang
Ugochukwu Njoku
Dale Riedy
Gustav Sittmann Iii
Original Assignee
International Business Machines Corporation
Ibm United Kingdom Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Business Machines Corporation, Ibm United Kingdom Limited filed Critical International Business Machines Corporation
Priority to EP09709864A priority Critical patent/EP2181395B1/en
Priority to JP2010546305A priority patent/JP5159902B2/en
Priority to AT09709864T priority patent/ATE504040T1/en
Priority to DE602009000984T priority patent/DE602009000984D1/en
Priority to CN2009801046989A priority patent/CN101939731B/en
Priority to KR1020107016970A priority patent/KR101243005B1/en
Publication of WO2009101058A1 publication Critical patent/WO2009101058A1/en
Publication of WO2009101058A4 publication Critical patent/WO2009101058A4/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/10—Program control for peripheral devices
    • G06F13/12—Program control for peripheral devices using hardware independent of the central processor, e.g. channel or peripheral processor
    • G06F13/124—Program control for peripheral devices using hardware independent of the central processor, e.g. channel or peripheral processor where hardware is a sequential transfer control unit, e.g. microprocessor, peripheral processor or state-machine
    • G06F13/126—Program control for peripheral devices using hardware independent of the central processor, e.g. channel or peripheral processor where hardware is a sequential transfer control unit, e.g. microprocessor, peripheral processor or state-machine and has means for transferring I/O instructions and statuses between control unit and main processor

Abstract

A computer program product, apparatus and method for processing a variable length device command word (DCW) at a control unit configured for communication with an input/output (I/O) subsystem in an I/O processing system. The computer program product includes a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method. The method includes receiving a DCW at the control unit from the I/O subsystem. The DCW specifies one or more I/O operations and includes a command, a control data count, and control data having a varying length specified by the control data count. The control data is extracted in response to the control data count. The command is then executed in response to the extracted control data to perform the specified one or more I/O operations.

Claims

AMENDED CLAIMS received by the International Bureau on 17 August 2009 (17.08.2009)
1. A computer program product for processing a variable length device command word (DCW) at a control unit configured for communication with an input/output (I/O) subsystem in an I/O processing system, the computer program product comprising:
a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
receiving a DCW at the control unit from the I/O subsystem, the DCW specifying one or more I/O operations and including a command, a control data count, and control data having a varying length specified by the control data count;
extracting the control data in response to the control data count;
executing the command in response to the extracted control data to perform the specified one or more I/O operations; and
wherein the DCW further includes a customer data count specifying an amount of customer data associated with the DCW.
2. The computer program product of claim 1 wherein the customer data count has a value greater than zero and the method further comprises receiving customer data from the I/O subsystem.
3. The computer program product of claim 1 wherein the customer data count has a value greater than zero and the method further comprises transmitting the customer data to the I/O subsystem.
4. The computer program product of claim 1 wherein the method further comprises completing the I/O operations and transmitting a completion message to the I/O subsystem in response to the completing.
5. The computer program product of claim 1 wherein the DCW is received via a transport command control block (TCCB) that includes a transport command area (TCA) header, a TCA where the DCW is located, and a TCA trailer.
6. The computer program product of claim 5 wherein the TCA includes one or more other commands for execution by the control unit.
7. The computer program product of claim 1 wherein the I/O subsystem is a channel subsystem.
8. An apparatus for processing a variable length DCW in an I/O processing system, the apparatus comprising:
a control unit configured for communication with an I/O subsystem, the control unit performing a method comprising:
receiving a DCW specifying one or more I/O operations at the control unit from the I/O subsystem, the DCW including a command, a control data count, and control data having a varying length specified by the control data count;
extracting the control data in response to the control data count;
executing the command in response to the extracted control data to perform the specified one or more I/O operations; and
wherein the DCW further includes a customer data count specifying an amount of customer data associated with the DCW.
9. The apparatus of claim 8 wherein the customer data count has a value greater than zero and the method further comprises receiving the customer data from the I/O subsystem.
10. The apparatus of claim 9 wherein the customer data count has a value greater than zero and the method further comprises transmitting the customer data to the I/O subsystem.
11. The apparatus of claim 8 wherein the method further comprises completing the I/O operations and transmitting a completion message to the I/O subsystem in response to completing.
12. The apparatus of claim 8 wherein the DCW is received via a TCCB that includes a TCA header, a TCA where the DCW is located, and a TCA trailer.
13. The apparatus of claim 12 wherein the TCA includes one or more other commands for execution by the control unit.
14. A method for processing a variable length DCW at a control unit configured for communication with an input/output (I/O) subsystem in an I/O processing system, the method comprising:
receiving a DCW specifying one or more I/O operations at the control unit from the host computer system, the DCW including a command, a control data count, and control data having a varying length specified by the control data count;
extracting the control data in response to the control data count; and
executing the command in response to the extracted control data to perform the specified one or more I/O operations;
wherein the DCW further includes a customer data count specifying an amount of customer data associated with the DCW.
15. The method of claim 14 wherein the customer data count has a value greater than zero and the method further comprises receiving the customer data from the I/O subsystem.
16. The method of claim 14 wherein the customer data count has a value greater than zero and the method further comprises transmitting the customer data to the I/O subsystem.
17. The method of claim 14 further comprising completing the I/O operations and transmitting a completion message to the I/O subsystem in response to the completing.
PCT/EP2009/051463 2008-02-14 2009-02-09 Processing a variable length device command word at a control unit in an i/o processing system WO2009101058A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
EP09709864A EP2181395B1 (en) 2008-02-14 2009-02-09 Processing a variable length device command word at a control unit in an i/o processing system
JP2010546305A JP5159902B2 (en) 2008-02-14 2009-02-09 Method for processing a variable length device command word (DCW) in a controller configured to communicate with a channel subsystem in an I / O processing system
AT09709864T ATE504040T1 (en) 2008-02-14 2009-02-09 PROCESSING OF VARIABLE-LENGTH DEVICE COMMANDS ON A CONTROL UNIT IN AN I/O PROCESSING SYSTEM
DE602009000984T DE602009000984D1 (en) 2008-02-14 2009-02-09 PROCESSING DEVICE COMMANDS OF VARIABLE LENGTH ON A CONTROL UNIT IN AN I / O PROCESSING SYSTEM
CN2009801046989A CN101939731B (en) 2008-02-14 2009-02-09 Processing a variable length device command word at a control unit in an I/O processing system
KR1020107016970A KR101243005B1 (en) 2008-02-14 2009-02-09 Processing a variable length device command word at a control unit in an i/o processing system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/030,939 2008-02-14
US12/030,939 US7840717B2 (en) 2008-02-14 2008-02-14 Processing a variable length device command word at a control unit in an I/O processing system

Publications (2)

Publication Number Publication Date
WO2009101058A1 WO2009101058A1 (en) 2009-08-20
WO2009101058A4 true WO2009101058A4 (en) 2009-10-15

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PCT/EP2009/051463 WO2009101058A1 (en) 2008-02-14 2009-02-09 Processing a variable length device command word at a control unit in an i/o processing system

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US (1) US7840717B2 (en)
EP (1) EP2181395B1 (en)
JP (1) JP5159902B2 (en)
KR (1) KR101243005B1 (en)
CN (1) CN101939731B (en)
AT (1) ATE504040T1 (en)
DE (1) DE602009000984D1 (en)
WO (1) WO2009101058A1 (en)

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