JPH0431421B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] In an input/output command control method for a communication control processing device, each adapter in the device executes input/output commands under the control of a central processing unit, and each adapter executes each input/output command that it executes. When a running level is assigned according to the type of input/output command and the central processing unit accepts the input/output command issued, the central processing unit completes the processing of the input/output command before executing the input/output command. Notify. This enables the central processing unit to process the next input/output command, reducing the waiting time for processing completion and improving the processing efficiency of the system.

[Industrial application field]

The present invention relates to an input/output command control method in a communication control processing device, and more particularly to an input/output command control method that reduces waiting time for completion of processing of input/output commands and improves system processing efficiency.

[Conventional technology]

A communication control processing device is a device that is interposed between a communication line and a host processor and performs the necessary control when transmitting data between the host and other computer systems, terminal devices, etc. connected to the communication line. .

FIG. 2 is a block diagram showing the basic configuration of the communication control processing device.

In FIG. 2, reference numeral 100 denotes a communication control processing device, which includes a central processing section 110, a channel connection adapter 120, a line connection adapter 130, and an internal bus 140.

The central processing unit 110 internally includes a main memory 111 and a main control unit 112, and the main memory 111 stores a control program (CP) for controlling communication control operations.
program) and data are stored.

The main control unit 112 controls the execution of commands of the NCP, executes input/output commands to the channel connection adapter 120 and line connection adapter 130, controls interrupts from each component, and the like.

The channel connection adapter 120 internally includes a control memory 121, a processor 122, and a channel connection section 123, and controls the interface and mutual data transfer between a host processor (not shown) and a communication control processing device.

The control memory 121 includes channel connection adapter 1.
Control programs and data for controlling the operations of 20 are stored. The channel connection unit 123 controls the connection and interface between the channel of the host processor (not shown) and the communication control processing device.
The processor 122 controls the execution of commands of the control program, controls the operation of the channel connection section 123, and controls mutual data transfer between the host processor and the communication control processing device.

The line control adapter 130 has internal control memory 1.
31, processor 132 and transmission/reception control section 133
It controls the interface and data transmission and reception between the line and the communication control processing device.

The control memory 131 includes the line control adapter 130
A control program and data for controlling the operation of the controller are stored. The transmission/reception control unit 133 interfaces the line and the communication control device, performs line connection processing, and performs transmission/reception processing.
Controls the disassembly/assembly processing of received characters. The processor 132 controls the execution of commands of the control program and controls the operation of the transmission/reception control section 133 to transmit and receive data between the line and the communication control processing device.

In this way, the communication control processing device is based on a microprogram control system.

The internal bus 140 includes a central processing unit 110, a channel connection adapter 120, and a line connection adapter 13.
0 to each other.

Next, the input/output command control operation performed by the communication control processing device will be explained with reference to FIG. Note that since the input/output control operations of the channel connection adapter 120 and the line connection adapter 130 are basically the same, the case of the channel connection adapter 120 will be described below as an example.

FIG. 3 shows a time chart of input/output control for the channel connection adapter. The upper row shows a time chart of input/output command processing performed by the central processing unit 110, and the lower row shows a time chart of input/output command processing performed by the channel connection adapter 120. The numbers 1, 2, 1′, 2′, 1″, 2″ etc. in each row are as follows:
Indicates each processing unit.

In the channel connection adapter 120, when the output command is executed at the normal program running level (level 1), the input command is executed at the same or higher level than the output command running level (level 1). It is executed at a high priority level (level 2) (FIG. 3 shows the case where the input command is executed at level 2).

The central processing unit 110 receives commands from the host processor via the channel connection adapter 120. This command processing is started by an interrupt from the channel connection adapter 120. A part of the input/output command processing between the channel connection adapter 120 and the central processing unit 110 in this command processing is performed by the third
As shown in the figure. The central processing unit 110 performs command processing by combining input and output commands for the channel connection adapter 120. In addition, processing 1-2, 5-7
is an operation inside the central processing unit 110, and 3 and 4 are input/output instructions.

When the channel connection adapter 120 receives this output command, it controls the inside of the channel adapter 120 in accordance with the output command (processes 1' to 4'). When the process is completed, a process completion notification is sent to the central processing unit 110 (process 5').

The central processing unit 110 includes a channel connection adapter 1
Upon receiving the processing completion notification from 20, an input command is issued to the channel connection adapter 120 (processing 4).

Upon receiving this input command, the channel connection adapter 120 informs the central processing unit 1 of the completion of the input command together with the internal state of the channel connection adapter 120.
10 (processes 1″ to 4″).

When the central processing unit 110 receives this processing completion notification, it becomes possible to perform the next input/output command or the processing inside the central processing unit 110.

The above operation is the same even when the running level of the input command is level 1, which is the same as the running level of the output command.

In this way, in the input/output command control method of the conventional communication control processing device, the input command and the output command are processed by the next command after the processing of each command is completed, regardless of whether the running level is the same or different. It was configured to process instructions.

The above also applies to the line connection adapter 130.

[Problem that the invention seeks to solve]

In conventional communication control processing devices, as mentioned above, when a channel connection adapter or a line control adapter executes input/output command processing, it does not matter whether the input/output command is an input command or an output command. Furthermore, regardless of the running level, the next command is processed after the command is completed.

For this reason, the central processing unit 110 uses the control program CP until the command processing is completed, regardless of input commands and output commands, and regardless of the running level.
As shown in Figure 3, there is a processing completion waiting time ΔT between one input/output command (output command) and the next input/output command (input command). There was a problem with processing being delayed. When the number of input/output commands is large, this waiting time accumulates, resulting in a decrease in processing efficiency.

Furthermore, even when an input command unrelated to the output command is executed after an output command, the control program NCP of the central processing unit 110 cannot interrupt the next input command unless it is notified that the processing of the output command has completed. ,
There was a problem that the next input command could not be executed until the output command was completed.

The present invention reduces the processing completion waiting time that occurs between each input/output command in a channel connection adapter or line connection adapter of a communication control processing device, and allows other inputs with a high running level unrelated to the input/output command to be performed next to the input/output command. An input/output control method in a communication control processing device that improves system processing efficiency by enabling the execution of other input/output instructions without stepping over the completion of processing of the input/output instruction when executing an output instruction. The purpose is to provide

[Means for solving problems]

The means taken by the present invention to solve the above-mentioned problems in the input/output control system of the conventional communication control processing device will be explained with reference to FIG.

FIG. 1 shows a time chart of the input/output control method of the present invention.

The basic configuration of the communication control processing device in which the input/output control method of the present invention is implemented is the same as that shown in FIG. 2, so FIG. 2 will also be referred to in the following description.

In FIG. 1, the upper row shows a time chart of input/output command processing performed by the central processing unit 110, and the lower row shows a time chart of input/output command processing performed by the channel connection adapter 120 or line connection adapter 130 (hereinafter simply referred to as adapter). show. Numbers 1, 2, 1', 2', 1'', 2'', etc. in each row indicate each processing unit. Levels 1 and 2 indicate the running levels of each input/output command executed by the adapter, and level 2 is a running level with higher priority than level 1.

The adapter assigns a running level when executing each input/output instruction in accordance with the type of each input/output instruction.

Now, when the central processing unit 110 issues an input/output command (input/output command 1) to the adapter, the adapter performs the process of accepting the input/output command 1 (processing 1') and then processes the input/output command 1. Prior to execution, a processing completion notification for input/output instruction 1 is issued to central processing unit 110 (process 5').

When the central processing unit 110 receives this processing completion notification, the central processing unit 110 executes the input/output commands (input/output command 2 and ), a processing instruction for the input/output instruction 2 is issued to the adapter (processing 4).

After issuing the processing completion notification, the adapter continues to execute the input/output command 1 (processes 2' and 3').
Upon receiving the input/output command 2 from the central processing unit 110,
The execution of input/output command 1 is suspended and the processing of input/output command 2 with a high running level is executed. When the processing of input/output command 2 is completed, the completion of the processing is notified to the central processing unit 110 (processes 1'' to 4). ″).

Upon receiving this processing completion notification, the central processing unit 110 issues the next input/output command to the adapter.

When the processing of input/output instruction 2 is completed, the adapter uses the processing period until receiving the next input/output instruction from central processing unit 110 to execute the remaining instruction part of input/output instruction 1 that has been put on hold. (Process 4').

Note that when an input command is executed next to an output command in the same adapter, the processing of the output command may affect the data of the next input command, and in that case, the running level of the next input command Even if the running level of the output command is higher than the running level of the output command, a problem arises in that the execution of the input command must be suspended until the processing of the output command is completed.

In this case, since it is possible to detect whether the next input command has an effect on data from the content of the output command, it is detected whether the next input command has an effect on the data when performing acceptance processing for the output command. If it is detected that there is an influence, level 2, which is the run level of the input command, is masked, execution of the input command is suspended, and processing of the output command is continued until it is completed. By doing so, the above-mentioned problem can be solved.

[Effect]

Each adapter of the communication control processing device is assigned a running level according to the type of each input/output command that it executes, and when the central processing unit 110 performs acceptance processing for the input/output command issued, the adapter receives the input/output command. Prior to execution, a processing completion notification for the input/output command is issued to the central processing unit 110, thereby enabling the central processing unit to process the next input/output command.

As a result, as shown in FIG. 1, the processing completion waiting time that occurs between input/output commands of different running levels can be shortened, and the processing efficiency of the system can be improved.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 and 2, taking the case of a channel connection adapter 120 as an example.

In the channel connection adapter 120, input/output command 1 and input/output command 2 are output commands and input commands, respectively, as shown in parentheses, and the running levels are level 1 and level 2, respectively.

The input/output command control method in the channel connection adapter will be described below in accordance with the processing progress shown in the time chart of FIG.

(1) When the central processing unit 110 receives a command from a host processor (not shown) via a channel connection adapter, it performs a reception process (processing 1,
2).

(2) The central processing unit 110 issues an output command to the channel connection adapter 120 to determine a command from the host processor and perform data transfer processing in response to the command, and determines and controls the state of the channel connection adapter (processing 3). , 4).

(3) When the channel connection adapter 120 receives this output command, it performs an acceptance process (process 1').
In this reception process, the central processing unit 110
A process for detecting the type of input/output command from is performed. If an output instruction is detected, the content of the output instruction is further checked to detect whether the processing of this output instruction will affect the data of the next input instruction. will also be held.

(4) If it is detected that the input/output command from the central processing unit 110 is an output command and the processing of the output command does not affect the data of the next input command, the channel connection adapter 1
20 issues an output command processing completion notification to the central processing unit 110 before executing the output command (process 5'). (Processing when the processing of an output command affects the data of the next input command will be explained in section (10) below.) (5) The channel connection adapter 120 issues a notification of completion of processing of the output command. Then, the output command is subsequently executed (processes 2' and 3').

(6) Upon receiving the processing completion notification, the central processing unit 110 connects the channel connection adapter 1 as necessary.
It becomes possible to immediately issue an input command to 20 (process 4).

(7) When the channel connection adapter 120 receives this input command, it suspends the execution of the previous output command and executes the processing of the input command with a high running level, and when the processing of the input command is completed, the processing A notification of completion is sent to the central processing unit 110 (processes 1'' to 4'').

(8) Upon receiving this processing completion notification, the central processing unit 110 issues the next input/output command, for example, the next output command, to the channel connection adapter 120.

(9) When the processing of the input command is completed, the channel connection adapter uses the processing period until receiving the next input/output command from the central processing unit 110 to execute the remaining command part of the pending output command. (Process 4'). Output instructions generally have more processing items than input instructions, but if the output instruction's execution level is lower than the input instruction's execution level, as is clear from the above explanation, the interrupt processing period of the input instruction can be used. This is advantageous because a large number of output instructions can be executed.

By doing the above, as shown in FIG. 1, there is no processing completion waiting time between the output command processing and the input command processing executed in the channel connection adapter 120, and the conventional input/output command that executes the same input/output command is eliminated. Output command control method (see Figure 3)
The processing time can be reduced by the time equivalent to three processing units compared to the above. If the I/O command is executed many times, this time savings can accumulate and improve the processing efficiency of the system.

(10) If the result of the output command affects the data of the next input command, the channel connection adapter 120 suspends execution of the input command by masking level 2, which is the running level of the input command; Following the processing completion notification, the output command processing is executed. After completing the processing of the output command, the mask is removed and the input command is processed.

Although the case of the channel connection adapter 120 has been described above as an example, the case of the line connection adapter 130 is also performed in the same manner.

Further, in the input/output command control method of the present invention, another adapter (for example, the line connection adapter 130) assigns an interrupt level higher than the running level of one adapter (for example, the channel connection adapter 120) to the central processing unit 110. It is also effective in cases where

That is, if the central processing unit 110 is executing one instruction, the next interrupt will not be accepted until this instruction is completed. Therefore, if the channel connection adapter 120 notifies the completion of processing quickly, the interrupt processing of the line connection adapter 130 can be performed quickly. In this case as well, as in the above-described embodiment, the processing completion waiting time can be shortened and processing efficiency can be improved.

〔Effect of the invention〕

As explained above, according to the present invention, the processing completion waiting time that occurs between input/output commands of different running levels in input/output command control of a communication control processing device can be shortened, and the processing efficiency of the system can be improved. .

[Brief explanation of drawings]

Fig. 1: Time chart of the input/output command control method of the present invention; Fig. 2: Explanatory diagram of the communication control processing device;
FIG. 3: Time chart of input/output command control method in a conventional communication control processing device. In FIG. 2, 100... communication control processing device, 110... central processing unit, 120... channel connection adapter, 130... line channel adapter, 140... internal bus.

Claims (1)

[Claims] 1. Microprogram control channel connection adapter 12 having multiple program running levels.
0, a line connection adapter 130, and a central processing unit 110. (a) Each adapter 120, 130 executes an input/output command controlled by the central processing unit 110. (b) Each of the adapters 120 and 130 is assigned a running level according to the type of each input/output command that they execute, and (c) the central processing unit 110 issues an input/output command to one adapter. Then, the adapter performs acceptance processing for the input/output command, and then issues a processing completion notification of the input/output command to the central processing unit 110 before executing the input/output command. Command control method. 2. The input/output command control method according to claim 1, wherein when the input/output commands are output commands and input commands, a higher program execution level is given to the input commands than to the output commands. 3. In the process of accepting an input/output command from the central processing unit 110, if the input/output command is an output command, the adapter detects whether or not the processing of the output command has an influence on the data of subsequent input commands, and determines the influence. 3. The input/output command control method according to claim 2, wherein if there is no effect, a processing completion notification for the output command is issued, and if there is an influence, the running level of subsequent input commands is masked.