JPH0588944A - Input/output control and monitor system for information processing system - Google Patents

Abstract

PURPOSE:To effectively use the processing capability of a central processing unit by checking the end state of an input/ output controller and an input/output device at the time of the end of another processing in the central processing unit to eliminate a need of monitor of end report and gathering of trouble data from the input/output controller. CONSTITUTION:A central controller 1, a main storage device 2, and plural input/output controllers 10 and 11 are connected to a processor bus 3, and plural input/output devices 13, 14, and 16 are connected to input/output controllers 10 and 11. The main storage device 2 is used for start report from the central processing unit 1 to input/output controllers 10 and 11 and end report in the opposite direction. An input/output control monitor device 4 monitors the presence or the absence of this end report and the presence or the absence of a trouble (abnormality) flag in end report data. Trouble (abnormality) data is stored in the main storage device 2 if the absence of end report is detected, and detailed state information is stored in the main storage device 2 if the trouble (abnormality) flag is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input / output control monitoring method for an information processing system, and more particularly to a failure (abnormality) processing of an end report from the input / output control unit to the central control unit.

[0002]

2. Description of the Related Art A conventional information processing system has a configuration as shown in FIG. The central controller 101 uses the processor bus 3 to connect the main memory 2 and the input / output controller 110,
It is connected to 111. The input / output control device 110 is connected to the input / output devices 13 and 14 via the device bus 12. The input / output control device 111 is connected to the input / output device 16 via the device bus 15. Central controller 1
01 is connected to the input / output control devices 110 and 111 via a plurality of activation signal lines 20. Each input / output control device 11
The activation completion reports of 0 and 111 are connected to the central control unit 101 via a plurality of signal lines 21. Further, the end reports of the input / output control devices 110 and 111 are connected to the central control device 101 via the signal line 22.

Next, a conventional technique in the write operation will be described by taking a magnetic tape device as the input / output devices 13 and 14 and a magnetic tape control device as the input / output control device 110 as an example.

The central controller 101 executes the instructions in the main memory 2 to perform various data processing and input / output control. The central control device 101 activates the input / output control device 110 via the activation signal line 20 when executing an instruction to record the data in the main storage device 2 in the magnetic tape device 13. The activated input / output control device 110 informs the central control device 101 via the signal line 21 whether or not it has been activated normally. That is, it is a start-up report. When the central control unit 101 learns from the signal line 21 that the input / output control unit 10 can be started normally, it moves to the next process.
When the input / output control device 10 cannot be normally started, the central control device 101 shifts to a failure (abnormality) process. On the other hand, the activated input / output control device 110 reads a command from the main storage device 2 via the processor bus 3 and executes the operation according to the command. The input / output control device 110 instructs the magnetic tape device 13 to start operation. Next, the input / output control device 110 transfers data between the main storage device 2 and the magnetic tape device 13 via the device 12. The input / output control device 110 records the data in the main storage device 2 on the magnetic tape during the write operation. This operation is performed for the number of bytes specified by the command.

The input / output control unit 110 is
When it is detected that the designated number of bytes have been sent from the main storage device 2 to the magnetic tape device 13, the magnetic tape device 13 is detected.
Stop the operation of. Next, the input / output control device 110 stores the end state [normal or fault (abnormality) flag] of the magnetic tape device 13 and the input / output control device 110 in a specific address in the main storage device 2. After that, the input / output control unit 110 sends a completion report to the central control unit 101 via the signal line 22.
This end report is generally an interrupt signal to the central controller 101. The central control unit 101, which has received the end report, checks the end state, and when the end is normal, moves to the next process. When there is a failure (abnormality), the procedure goes to failure (abnormality) processing.

[0006]

When the central controller of the above-mentioned conventional information processing system starts the input / output controller, it waits for its end report (interrupt signal). When receiving the end report from the input / output control unit, the central control unit examines the end state and determines whether to go to the normal state or go to the failure (abnormality) process. The central control unit predicts the operating time of the input / output control unit in advance when the input / output control unit is activated. If there is a termination report from the I / O controller within the time predicted by the central controller, check the termination status. However, if there is a failure (abnormality) in the input / output control device or the input / output device, the end report may not be issued within the predicted time. In this case as well, the central control unit must perform fault (abnormality) processing. Therefore, the central control unit must always monitor the end report when the I / O control unit is activated.

The processing speed of the central controller is much faster than the processing speed of the input / output device. In recent years, the progress of semiconductor technology has been remarkable, and the progress of the processing speed of the central control unit is remarkably higher than the progress of the processing speed of the input / output device, and the difference in the processing speed is becoming wider. The central control unit with this high processing speed must monitor the end status of the processing of the slow input / output control unit.

Now, suppose that the monitoring cycle of the central control unit is 1 m.
s, the monitoring processing time per time is 10 μs, and the operating time of the input / output device is 60 seconds, [60 s ÷ 1 × 10 ^-3 ] × 10 × 10 ^-6 = 0.6 s The total monitoring processing time is 0 .6 seconds. On the other hand, if the monitoring cycle of the central controller is 100 ms and the other conditions are the same, [60 s ÷ 0.1] × 10 × 10 ⁻⁶ = 60 × 10 ⁻⁶ s The total monitoring processing time is 60 μs, It is less time than the former. The monitoring cycle of the input / output device by the central controller is determined by other input / output devices, other processing cycle, clock frequency, and the like. Therefore, increasing the monitoring cycle has a drawback that it affects other processes and increases hardware. This drawback is magnified as the processing speed of the central controller increases.

[0009]

According to an input / output control method of an information processing system of the present invention, a central processing unit, a main storage unit and a plurality of input / output control units are connected to a processor bus, and the input / output control unit is connected to the input / output control unit. In an information processing system in which a plurality of input / output devices are connected, means for monitoring the presence / absence of a termination report from the input / output control device to the central control device and the presence / absence of a failure (abnormality) flag in the termination report data, A means for storing failure (abnormality) display data in a specific address of the main storage device when no end report is detected, and an input / output device corresponding to the input / output control device itself when detecting the existence of the failure (abnormality) flag. An input / output control monitoring device having means for storing status information with the input / output control device at a specific address of the main storage device is connected to the processor bus, and the input / output control is performed from the central control device. It is configured to perform end report and of the output device from the activation instruction to the output control device of the input device to location to the central control device via the main storage device.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. The central control unit 1 is connected to the main storage unit 2, the input / output control units 10 and 11 and the input / output control monitoring unit 4 via the processor bus 3. The input / output control device 10 uses the device bus 12 to input / output devices 13,
It is connected to 14. The input / output control device 11 is connected to the input / output device 16 via the device bus 15.

FIG. 2 is an information allocation diagram in the main storage device 2 and shows only a portion related to the present invention. Figure 2
As shown in (a), the main storage device 2 has as many input / output control / monitoring information 2 as the number of input / output control / monitoring devices (for example, one).
00 and input / output control status information 300 corresponding to the number of input / output control devices (for example, n).

FIG. 2B is a detailed diagram of the input / output control monitoring information 200 of FIG. Input / output control monitoring information 200
Is composed of a plurality (# 1 to #n) of input / output monitoring data 210. The input / output monitoring data 210 exists for each input / output device, and includes an F unit 211 and a monitoring time unit 212 having a plurality of bytes. When the F section 211 is "0", the corresponding input / output device is not monitored, and when the F section 211 is "1", the corresponding input / output device is monitored. The monitoring time of the monitoring time 212 is the time from the start of the input / output device to the end report.

FIG. 2C is a detailed diagram of the input / output control state information 300 shown in FIG. Input / output control status information 300
Is an E unit 310, a control command unit 320, and an SS unit 3
30 and a DS section 340 of a plurality of bytes.

When the E section 310 is "00", it indicates a control command execution prohibited state. When the E section 310 is “11”, it indicates the executable state of the control command. Part E 310
"01" indicates that the control command is being executed by the input / output control device. When the E unit 310 is “10”, the input / output control monitoring device is executing (monitoring) the control command being executed by the input / output control device (see FIG. 2D).

The control command section 320 sets a command given by the central control unit to the input / output control unit. 「×××
X0010 ”start, etc. (see FIG. 2 (e)).

The SS section 330 displays whether the DS section 340 is valid or invalid (see FIG. 2 (f)). In the DS section 340,
Normal operation or failure (abnormality) of I / O controller and I / O device
Data (flag) DS for displaying the state and the like is set.

Next, the data in the main storage device 2 is recorded on a magnetic tape by using a magnetic tape device as the input / output device 13 and a magnetic tape controller as the input / output control device 10 in FIG. 1 as an example. The operation (write operation) to be performed will be described.

In FIG. 1, when reset by a power-on system reset key (not shown), the central control unit 1 initializes the main storage unit 2 and sets the F section 211 of each input / output monitoring data 210. "0" (stop monitoring)
A value determined for each input / output device is set in the monitoring time section 212. Further, the E section 310 of the input / output control state information 300
Is set to “00” (execution is prohibited), and the SS section 330 is set to “00”.
Set to (DS invalid).

On the other hand, when the input / output control device (magnetic tape control device) 10 and the input / output control monitoring device 4 are reset, they stand by for a time to complete the initialization of the central control device 1, and the initial control of the central control device 1 is started. When the setting is completed, the main storage device 2 is periodically visited to see the E section 3 of the input / output control state information 300.
Waiting for 10 to become "11", "10" or "01".

During this time, the central control unit 1 is in charge of the main memory unit 2.
When an instruction to record the data in the I / O device (magnetic tape device) 13 is executed, the SS section 330 of the I / O control status information 300 in the main memory 2 is set to "00" (DS invalid), and the control command section 320 is set. Set the control command (in this case "start") to. Furthermore, the magnetic tape device 1
The F section 211 of the input / output monitoring data 210 corresponding to 3 is set to "1" (monitor execution), and then the E section 310 is set to "11".
Set to (executable).

On the other hand, the magnetic tape control device 10 includes an E unit 3
When it is detected that 10 has become "11" (executable),
The input / output operation is started, and the command, the number of data transfer bytes, etc. for the magnetic tape device 13 are read from the main storage device 2 and executed. The magnetic tape control device 10 then moves to the E section 3
10 is set to “01” (the input / output control device is being executed). Further, the magnetic tape controller 10 transfers the data in the main storage device 2 to the magnetic tape device 13 until the number of data transfer bytes becomes zero.

On the other hand, the input / output control monitoring device 4 includes an E unit 31
When 0 is detected as "11" or "01",
Input / output monitoring data 210 corresponding to the magnetic tape device 13
Check the F part 211 of. If the F section 211 is "1" (monitoring is executed), the monitoring of the magnetic tape device is started for the monitoring time set in the monitoring time section 212. At the same time, the E section 310 of the input / output control status information 300 is set to “10” (monitoring device is being executed). After that, the SS unit 330 is monitored to become “11” (DS valid).

The magnetic tape control device 10 transfers the number of data transfer bytes and the data in the main storage device 2 to the magnetic tape device 13 unless a failure (abnormality) occurs in the magnetic tape control device 10 or the magnetic tape device 13. To do. Upon completion of this data transfer, the magnetic tape control device 10 puts the end state [fault (abnormality) flag] of the magnetic tape control device 10 and the magnetic tape device 13 into the DS unit 340 of the input / output control state information 300 and the SS unit. Set 330 to "11" (DS is valid).

When a failure (abnormality) occurs in the magnetic tape controller 10 or the magnetic tape device 13 and the subsequent processing cannot be continued, the end state [failure (abnormality) flag] is not entered in the DS section 340, and the SS section is not entered. 330 is also "00" (DS invalid)
It remains.

On the other hand, the input / output control monitoring device 4 monitors that the SS section 330 of the input / output control status information 300 becomes "11" (DS valid) during the monitoring time set in the monitoring time section 212. The SS unit 330 is set to "1" during the monitoring time.
1 "(DS is valid), the monitoring of the magnetic tape controller 10 is stopped. However, within the above monitoring time, the SS unit 330
Does not become “11” (DS valid), failure (abnormal) display data (flag) is set in the DS section 340, and the SS section 3
Set 30 to "11" (DS is valid).

If the subsequent processing is continued even if a failure (abnormality) occurs in the magnetic tape controller 10 or the magnetic tape device 13, the magnetic tape controller 10 causes the DS section 340 to end when the processing is completed. [Fault (abnormality) flag] is stored, and “01” (input / output control device is being executed) is set in the SS unit 330.

The input / output control monitoring device 4 also includes an SS unit 33.
0 is being monitored. When the SS section 330 becomes “01” (error display), the data of the DS section 340 is temporarily saved, a specific value set for each input / output device is set in the monitoring time section 212, and the SS section 330 is set to “00”. Set to (DS invalid). Then, the control command section 320 of the information in the main storage device 2
Control command (in this case, "status read") is set, and then the E section 310 is set to "11" (executable).
When the magnetic tape control device 10 detects that the E section 310 has become “11”, it starts the status read operation. The magnetic tape control device 10 stores the state of the magnetic tape device 13 and the state of the magnetic tape control device 10 at a specific address in the storage device 2. When the storage is completed, the end state (flag) of the magnetic tape control device 10 and the magnetic tape device 13 is set in the DS unit 340, and the SS unit 330 is set to "10" (status read). The input / output control monitoring device 4 includes the SS unit 3
When 30 becomes "10", the data of the DS section 340 is checked.

If the fault (abnormality) flag is set, the fault processing is executed. The fault processing will be omitted.

When the failure (abnormal) flag is not set in the data of the DS section 340, the saved data of the DS section 340 is returned and the SS section 330 is set to "11" (DS is valid). Then, the E unit 310 sets “11” (executable) or “0”.
Wait until it becomes 1 ”(I / O controller is running).

The central control unit 1 uses the S of the information in the main storage unit 2.
The S section 330 is read as appropriate, and the SS section 330 reads "11".
If it is other than (DS valid), other processing is performed. When the SS unit 330 is “11”, the central controller 1 has the DS unit 3
40 is read out and a normal termination process or a failure (abnormality) process is performed.

[0032]

As described above, according to the present invention, when the central control device activates the input / output control device, the central control device determines that the input / output control device and the input / output device are terminated when other processing is completed. The end state is inspected, and if it is in a normal state, normal processing is performed, and if it is in a failure (abnormal) state, failure (abnormal) processing is executed. Therefore, the central control unit does not have to constantly monitor the end report of the I / O control unit, and does not have to execute the status read when the I / O control unit and the I / O unit have a failure (abnormality). Other processing can be performed. Further, there is an effect that the faster processing capacity of the central control unit can be effectively utilized for processing other than the monitoring of the input / output device.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIGS. 2A to 2C are information allocation diagrams in the main memory device according to the present invention, and FIGS. 2D to 2F are code allocation diagrams of input / output control state information.

FIG. 3 is a block diagram of a conventional information processing system.

[Explanation of Codes] 1,101 Central control unit 2 Main storage device 3 Processor bus 10,110 Input / output control device (magnetic tape control device) 11,111 Input / output control device 12,15 Device bus 13,14 Input / output device ( Magnetic tape device) 16 I / O device

Claims (1)

[Claims] 1. An information processing system in which a central control unit, a main storage unit, and a plurality of input / output control units are connected to a processor bus, and a plurality of input / output units are connected to the input / output control unit. Means for monitoring the presence / absence of an end report from the device to the central controller and the presence / absence of a failure (abnormality) flag in the end report data; Means for storing the status information of the input / output device corresponding to the input / output control device and the self input / output control device in the specific address of the main storage device when the presence of the fault (abnormality) flag is detected. An input / output control monitoring device having means for storing the input / output control monitoring device is connected to the processor bus, the central control device issues an instruction to activate the input / output device to the input / output control device, and An input / output control monitoring system for an information processing system, characterized in that a completion report of the input / output device to a central control device is reported via the main storage device.