Abstract:
입력/출력 처리 시스템에서 제어 유닛과 채널 서브시스템간의 통신을 처리하기 위한 컴퓨터 프로그램 제품, 장치, 및 방법이 개시되었다. 컴퓨터 프로그램 제품은 처리회로로 판독할 수 있고 처리회로로 실행하기 위한 명령어를 저장하는 유형의 저장 매체를 포함한다. 상기 방법은 입력/출력 동작을 개시시키기 위해 채널 서브시스템으로부터 제어 유닛에 명령어를 전송하는 것; 동작의 완료에 대한 소정 기간을 설정하는 것; 및 소정 기간내에 동작이 완료되지 않았다는 것에 응답하여, 제어 유닛이 명령어에 대한 교환을 개설하였는 지에 대한 여부를 결정하기 위해 메시지를 전송하는 것을 포함한다.
Abstract:
Systems, methods and computer program products for providing indirect data addressing at an I/O subsystem of 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 control word for an I/O operation. The control word includes an indirect data address for data associated with the I/O operation. The indirect data address includes a starting location of a list of storage addresses that collectively specify the data, the list spans two or more non-contiguous storage locations. Data is gathered responsive to the list. The gathered data is transmitted to a control unit in the I/O processing system.
Abstract:
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 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 the host computer system obtaining a transport command word (TCW) for an I/O operation. The TCW specifies a location of one or more I/O commands and a flag. The flag is set to indicate that the location is an indirect address. The host computer system extracts the location of the one or more I/O commands and the flag from the TCW. The host computer system gathers the one or more I/O commands responsive to the location specified by the TCW and the flag, and then forwards the one or more I/O commands to the control unit for execution.
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.
Abstract:
Systems, methods and computer program products for providing indirect data addressing at an I/O subsystem of 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 control word for an I/O operation. The control word includes an indirect data address for data associated with the I/O operation. The indirect data address includes a starting location of a list of storage addresses that collectively specify the data, the list spans two or more non-contiguous storage locations. Data is gathered responsive to the list. The gathered data is transmitted to a control unit in the I/O processing system.
Abstract:
A state of an input/output (I/O) operation in an I/O processing system is determined. A request for performing the I/O operation is received from an I/O operating system at a channel subsystem and forwarded to a control unit controlling an I/O device for executing the I/O operation. After a predetermined amount of time passes without receiving indication from the control unit that the I/O operation is completed, an interrogation request is received at the channel subsystem from the I/O operating system for determining the state of the I/O operation. An interrogation command is sent from the channel subsystem to the control unit. A response is received from the control unit, the response indicates a state of the I/O device executing the I/O operation, a state of the control unit controlling the I/O device executing the I/O operation, and the state of the I/O operation being executed.
Abstract:
Un método para proporcionar un direccionamiento de datos indirectos en un subsistema I/O de un sistema (100) de tratamiento de I/O, comprendiendo el método: recibir (1002) una palabra de control para una operación de I/O en el subsistema de I/O, incluyendo la palabra de control una dirección de datos indirectos para datos asociados con la operación de I/O, incluyendo la dirección de datos indirectos una posición de inicio de una lista de direcciones de almacenamiento que especifica colectivamente los datos, extendiéndose la lista a dos o más posiciones de almacenamiento no contiguas; agrupar (1004) los datos que responden a la lista; y transmitir (1006) los datos agrupados a una unidad de control en el sistema de tratamiento de I/O; en el que la lista incluye además un primer indicador asociado con cada dirección de almacenamiento en la lista, teniendo el primer indicador un primer valor para indicar que la dirección de almacenamiento asociada se refiere a una parte de los datos y teniendo el primer indicador un segundo valor para indicar que la dirección de almacenamiento asociada se refiere a una posición de almacenamiento dónde las direcciones de almacenamiento adicional en la lista están posicionadas; en el que para cada dirección de almacenamiento en la lista, el agrupamiento incluye: acceder a la dirección de almacenamiento y al primer indicador asociado con la dirección de almacenamiento; añadir contenidos desde la dirección de almacenamiento a los datos en respuesta al primer indicador que tiene el primer valor; caracterizado por: acceder a una segunda dirección de almacenamiento y a un segundo indicador situado en la dirección de almacenamiento en respuesta al primer indicador que tiene el segundo valor, y añadir contenidos desde la segunda dirección de almacenamiento a los datos en respuesta al segundo indicador que tiene el primer valor.
Abstract:
Ein Verfahren zum dynamischen Wechseln zwischen Datenübertragungstechniken umfasst ein Empfangen einer E/A-Anforderung und ein Berechnen eines Kostenaufwands für ein Ausführen der E/A-Anforderung unter Verwendung einer Speicherkopie-Datenübertragungstechnik. Bei der Speicherkopie-Datenübertragungstechnik werden Cache-Segmente, die der E/A-Anforderung zugehörig sind, aus dem Cache-Speicher in einen permanent abgebildeten Speicher kopiert, der permanent auf ein Busadressfenster abgebildet ist. In dem Verfahren wird ferner ein Kostenaufwand für ein Ausführen der E/A-Anforderung unter Verwendung einer Speicherabbild-Datenübertragungstechnik berechnet. Bei der Speicherabbild-Datenübertragungstechnik werden temporär Cache-Segmente, die der E/A-Anforderung zugehörig sind, aus dem Cache-Speicher auf das Busadressfenster abgebildet. In dem Verfahren wird entweder die Speicherkopie-Datenübertragungstechnik oder die Speicherabbild-Datenübertragungstechnik verwendet, um die der E/A-Anforderung zugehörigen Cache-Segmente zu übertragen, in Abhängigkeit davon, welche Technik weniger kostenaufwändig ist. Es werden ferner ein entsprechendes System und Computerprogrammprodukt offenbart.