JPH048826B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an input/output control method in a computer system, and in particular, from a channel control device to a device control device, for example, character patterns, control logic, etc. Concerning methods for transferring control data.

[Summary of the invention]

The present invention aims to improve the efficiency of transfer control when transferring control data from a host to a device control device, which is necessary for the device control device to cause an input/output device to perform an input/output operation. , specify a dedicated device address that can be identified on the hardware as the transfer destination of the control data,
By treating the control mechanism of the device control device as an independent device, it is possible to transfer control data separately from normal input/output data transfer.

[Prior Art] Conventionally, control data was transferred from a host to a device control device using a device address defined in software. Therefore, in order to perform input/output control of normal input/output data and input/output control of control data independently under one device address, input/output data and control data must be controlled on the channel control side or device control side. It was necessary to separate the two.

FIG. 2 shows an example of the configuration of such a conventional computer system. In the figure, 1 is a host, 2 is a channel control function, 3 is a device control device, 4 is a device control function, 5 to 7 are input/output devices, and 8 to 10 are WAITs that wait for input/output commands during control data processing. part, 11 to 1
Reference numeral 3 indicates an input/output data control section, 14 to 16 indicate control data control sections, 17 to 19 indicate input/output device control sections, and 20 to 22 indicate input/output control data control sections.

Figure 3 shows the channel control function 2 in Figure 2.
FIG. 4 is a conceptual diagram for explaining the operation of the device control function 4 in an easy-to-understand manner.

For example, if the input/output device 5 is a display terminal and the device control device 3 does not have a character pattern prepared for the characters in the output data, the device control device 3 sends the host 1 a character pattern. A transfer request is issued and the control data controller 14 is activated. At this time, as described above, switching between input/output data transfer and control data transfer is performed in the data transfer unit 2. That is, the illustrated state is the control data controller 1
4 shows the transfer of control data; at this time, the input/output command is
When issued by the OS, BUSY is responded and the input/output data control unit 11 is not activated. Further, the device address of the input/output device 5, for example #1, is specified as the destination of control data transferred from the host to the device control device.

On the other hand, within the device control function, the input/output device 5
It determines whether the data transferred from the host with the destination device address is input/output data or control data, and if it is recognized as control data, starts the input/output control data control unit 20. and performs control data reception processing.

FIG. 4 is an operational flow showing more detailed operation of the conventional system shown in FIG. The upper half shows the operation of the channel control function, and the lower half shows the operation of the device control function. Also, a is input/output data transfer processing when input/output command SIO macro is issued,
And b shows the case of control data transfer processing.

In the case of input/output data transfer processing in a, when an input/output command SIO is issued from the operating system, the presence or absence of BUSY is checked, and if BUSY,
Enters WAIT state (according to WAIT parts 8 to 10).
On the other hand, if it is NOT BUSY, the input/output data transfer is executed (by the input/output data control units 11 to 13), and when it is completed, the finalization process is performed and the transition is made to the IDLE state where it waits for the next SIO to be issued.

Next, in the case of the control data transfer process of b, when the control data transfer control is started (by the control data control units 14 to 16), the BUSY state is set, input/output data transfer process is prohibited, and the control Executes data transfer processing and releases BUSY state after completion.
At this time, check whether the input/output instruction is in the WAIT state,
If it is NOT WAIT, it moves to IDLE state and WAIT
If so, cancel the WAIT state and execute the input/output data transfer process.

In this way, input/output data or control data is transferred from the host to the device controller.

When the device control function receives data transferred from the host, it checks whether an input/output operation instruction has been issued, and if it is an input/output operation instruction, it receives the input/output data and starts input/output processing. (by the input/output device control units 17 to 19).

In input/output processing, it is checked whether transfer of control data is necessary for the processing, and if necessary, an interrupt for control data request is raised to the host. It then waits for control data to be transferred. On the other hand, if the control data is not needed or if the control data has been received, it executes the input/output operation, and when it is finished, performs the finalization process and notifies the host (for example, by a device end DE interrupt). This results in
The input/output data control section within the channel control function performs finalization processing.

[Problem that the invention seeks to solve]

The conventional control data transfer method described above requires processing to separate input/output data and control data for both the channel control function and device control function, and when transferring control data, input/output commands are responded with BUSY. Therefore, there was a problem that the control was complicated, such as requiring queue control, and the response to input/output commands was slow.

[Means for solving problems]

The present invention provides a method for transferring input/output data and control data by allocating a special dedicated device address as a destination address when transferring control data from a host to a device control device, and identifying this on hardware. It is an independent version.

According to the configuration of the present invention, a host having a channel control means, a plurality of input/output devices each having a unique device address, and a plurality of input/output devices provided between the host and the host for controlling the plurality of input/output devices. a device control device, the device control device having a dedicated device address for receiving control data from a host, and a device address identification unit on hardware for identifying each of the device addresses; When executing an input/output command, the host specifies the device address of the input/output device and instructs the device control device to perform input/output operations and transfers input/output data. Identifies the device address and starts input/output operations to the input/output device at the specified device address according to input/output operation instructions from the host, and if new control data is required at that time, the host provides control. The host requests data transfer, and in response to the control data transfer request from the device control device, the host specifies the device address dedicated to the device control device and transfers the control data to the device control device, and the device control device: The apparatus is characterized in that when the device address identifying section identifies a dedicated device address instructed by the host, the received control data is taken in and the previously instructed input/output operation is executed.

〔Example〕

The details of the present invention will be explained below with reference to Examples.

FIG. 1 is a block diagram of a system according to an embodiment of the present invention. In the figure, 1 is a host, 3 is a device control device, 5 to 7 are input/output devices, 23 is a channel control function, 24 is a device control function, 25 to 27 are input/output data control units, 28 is a control data control unit, Reference numeral 29 indicates a device address identification section, 30 to 32 indicate input/output device control sections, 33 indicates an input/output control data control section, and 34 indicates a WAIT section.

FIG. 5 is a conceptual diagram for explaining the operation of the embodiment system shown in FIG. 1 in an easy-to-understand manner.
The operation of the system shown in FIG. 1 will be described below with reference to FIG. 5.

When the input/output command SIO is issued in the host 1, the input/output data control unit 25 of the channel control function 23 transfers the input/output data to, for example, the device address #1 of the input/output device 5 as the destination. This device address #1 is identified by the device address identification section 29 in FIG. 1 in the device control device, and the input/output device control section 30 is activated. The device address identification unit 29 is composed of hardware (including firmware) and is capable of quick response. In this way, the input/output device control unit 3
0 receives input/output data sent from the host and causes the input/output device 5 to perform input/output operations. At this time, if replenishment of control data is required, a control data transfer request is issued to the host.

When the control data control unit 28 transfers control data to the device control device 3, it specifies a device address specifically assigned as the control data transfer destination, for example, device address #N in the example of FIG. 5, as the destination. This device address #N is determined in advance so as not to overlap with other device addresses. In the device control device 3, the device address identification unit 29 identifies the device address #N, and activates the previously associated input/output control data control unit 33, as in the case of input/output data transfer. As a result, the input/output control data controller 33 receives the control data sent from the host, and notifies the input/output device controller 30 of the received control data. The input/output device control unit 30 executes input/output operations using the transferred control data.

FIG. 6 is a detailed operational flow diagram of the embodiment system of FIG. 1. In the figure, a is an input/output command
b shows the operational flow during input/output data transfer processing based on SIO issuance, and b shows the operational flow during control data transfer processing.

First, during the input/output data transfer process of a,
When the input/output command SIO is issued, the input/output data control unit of the channel control function executes input/output data transfer processing, and performs termination processing by completing the transfer.

On the device control device side, an input/output device control section receives input/output data and performs input/output processing. At that time, it is checked whether the control data is necessary or not, and if it is not necessary, the input/output operation is executed, and when all is completed, the final processing is performed. However, if control data is required, it is checked whether the control data transfer process in the input/output control data control section 33 is in the BUSY state, and the control data transfer processing in the input/output control data control section 33 is changed to the BUSY state based on a request from another input/output device control section. If set, a WAIT state is entered, and a queue is created by the WAIT section 34. If it is in the NOT BUSY state, the input/output control data controller 33 is set to the BUSY state, and an interrupt for a control data request to the host is generated.

As a result, the control data transfer process b is started. The control data transferred from the control data controller 28 of the host is received by the input/output control data controller 33 as a result of device address identification, as described above. Once all control data has been received,
The termination process notifies the input/output device control unit, and further releases the BUSY state. At this time, if any control data requests remain in the WAIT state, they are released from the WAIT state and re-entered.
Set the BUSY state and request control data.

In this way, the WAIT section 34 performs queue management for control data requests from each input/output device control section, and sequentially sends control data to the control data control section 28 and the input/output control data control section 33. transfer can be performed.

〔Effect of the invention〕

As described above, according to the present invention, there is no WAIT for input/output commands during control data transfer, and
Distributed processing becomes possible, and control data transfer processing of each input/output device control system can be unified, making it possible to simplify and centralize control.

Furthermore, since there is no need to directly execute control data transfer processing in input/output control, the input/output interrupt level can be released.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a system according to an embodiment of the present invention.
Figure 2 is a configuration diagram of a conventional system, and Figure 3 is a diagram of a conventional system.
A conceptual diagram of the conventional system shown in Fig. 4.
FIG. 5 is a conceptual diagram of the embodiment system shown in FIG. 1, and FIG. 6 is an operation flow diagram of the embodiment system shown in FIG. In the figure, 1 is the host, 3 is the device control device, and 5 is the host.
7 to 7 are input/output devices, 23 is a channel control function, 24 is a device control function, 25 to 27 are input/output data control units, 28 is a control data control unit,
29 is a device address identification section, 30 to 32 are input/output device control sections, 33 is an input/output control data control section, and 34 is a WAIT section.

Claims (1)

[Scope of Claims] 1. A host having channel control means, a plurality of input/output devices each having a unique device address, and a device provided between the host and the host for controlling the plurality of input/output devices. The device control device has a dedicated device address for receiving control data from the host, and has a device address identification section on hardware for identifying each of the device addresses, When executing an input/output command, the device specifies the device address of the input/output device and instructs the device control device to perform input/output operations and transfers the input/output data. It identifies the address and starts input/output operations to the input/output device at the specified device address according to input/output operation instructions from the host. If new control data is required at this time, the control data is sent to the host. In response to the control data transfer request from the device control device, the host specifies the device address dedicated to the device control device and transfers the control data to the device control device, and the device control device transfers the control data to the device control device. A control data transfer method, characterized in that when a device address identification unit identifies a dedicated device address instructed by the host, received control data is taken in and the previously instructed input/output operation is executed.