JP2615520B2 - I / O device status confirmation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for checking the status of an input / output device when a channel path reset (RCHP) instruction is issued.

In a computer system in which a plurality of input / output devices (I / O) are connected to each channel path via a plurality of channel paths, a central processing unit (CP)
To test the status of each input / output device (I / O) when the U) issues a channel path reset (RCHP) instruction, multiple I / O devices are connected to each channel path. Therefore, for example, if the test function task that tests a certain input / output device (I / O) issues the above-mentioned channel path reset (RCHP) instruction by itself, the input / output device (I / O) that is not related to the test function task There is a problem that affects I / O).

In addition, in cooperation with each test function task, while selecting all the channel paths of the computer system,
If the channel path reset (RCHP) instruction is issued, communication between a plurality of tasks is required because of the exclusive control of the channel path reset (RCHP) instruction, which complicates the control. There are problems such as.

[0004] From such a situation, arbitrarily the channel
A method for efficiently testing an input / output device (I / O) while issuing a path reset (RCHP) instruction is required.

[0005]

2. Description of the Related Art FIGS. 5 and 6 are diagrams for explaining a conventional method for checking the status of an input / output device. FIG. 5 shows an example of the configuration of a computer system, and FIG. (I
FIG. 3 is a diagram illustrating a test method of (/ O).

In FIG. 5, each input / output device (I / O) 6
Channel device (C) subordinate to channel processor (CHP) 3
H) 4 via an input / output control unit (IOC) 5, and a central processing unit (CPU) 1 issues an input / output instruction, so that a channel processing unit (CHP) 3 and a channel unit (CH ) Four
Autonomously decodes the input / output instruction and sends the necessary command
(Read / write / sense command) is issued to the corresponding input / output device (I / O) 6 via the channel path 40 and the input / output control device (IOC) 5, and each input / output device (I / O O) Control 6.

Channel path reset associated with the present invention
The (RCHP) instruction includes an input / output controller (IOC) 5 under the channel path 40 corresponding to the channel path identifier (CHPID) indicated by the channel path reset (RCHP) instruction, and an input / output device (I / O ) Clear the status of 6.

In order to test an arbitrary input / output device (I / O) 6 connected to the computer system, the conventional method uses the test function tasks A to a having the structure shown in FIG.
Is prepared, and the central processing unit (CPU) 1 executes the respective test function tasks A to a to test the corresponding input / output device (I / O) 6.

Accordingly, in the test function tasks A to a, the channel / path reset (RCH) for interrupting the hardware operation of the input / output control device (IOC) 5 and the input / output device (I / O) 6
P) The instruction may be executed.

Conventionally, in the test of a channel / path reset instruction (hereinafter referred to as RCHP instruction) for interrupting the hardware operation, a plurality of test function tasks A to a of a test program operate, and each test function task A
In a to a, the RCHP command is issued to an arbitrary channel path identifier (hereinafter referred to as CHPID) alone, or all the CHPIDs of the system are linked in the test function task group a. Channel path
The RCHP instruction is issued while selecting and controlling 40.

[0011]

In the former method in which the test function tasks A to a alone issue the RCHP instruction to an arbitrary channel path identifier (hereinafter, referred to as CHPID), any of For CHPID,
An input / output device (I / O) that is affected by reset processing connected to the CHPID to issue the RCHP instruction
There is a problem that it is difficult to confirm the validity of the completion operation of 6.

That is, it is impossible to recognize when and to which CHPID the reset was issued, except for the test function task Aa that issued the RCHP instruction. Normally, when the RCHP instruction is issued in the test function task Aa, a “device end” interrupt from the input / output device (I / O) 6 cannot be obtained. However, in the other test function tasks B to a,
It is impossible to determine whether the “device end” interrupt cannot be obtained due to an error of the input / output device (I / O) 6 itself, or whether it can be obtained by the RCHP instruction.

In the latter method, in which the RCHP instruction is issued while selecting and controlling all the CHPIDs in the system in cooperation with the test function tasks A to a, a plurality of test function tasks A, to a are used. Since exclusive control of issuance of the RCHP instruction is required in communication, control becomes complicated, and the overhead of processing in the entire test system increases, so that there is a problem that an efficient test cannot be performed.

The present invention has been made in view of the above-mentioned drawbacks, and in a computer system in which a plurality of input / output devices (I / O) are connected to each channel path via a plurality of channel paths.・ Path reset instruction (RCHP)
It is an object of the present invention to provide a method for efficiently testing the validity of the completion operation of an input / output device (I / O) at the time of issuance.

[0015]

FIG. 1 is a diagram illustrating the principle of the present invention. The above problem is solved by a method for confirming the status of an input / output device configured as follows.

A plurality of input / output devices (I / Is) are connected to each channel path 40 via the plurality of channel paths 40.
O) In the computer system to which 6 is connected, how to test the status of each input / output device (I / O) 6 when the central processing unit (CPU) 1 issues a channel path reset (RCHP) instruction. The channel / path reset task and the task of testing the validity of the completion operation of each input / output device are separated from the plurality of test function tasks corresponding to each input / output device (I / O) 6. Therefore, only one reset task in the system and a task for confirming the completion status of the input / output device status are provided, and the status bytes 60, 61 of each input / output device (I / O) 6 and the input when the input / output instruction is issued Output device startup information 62, channel / path reset (RCHP)
The date and time of occurrence (TOD) is added to the instruction issue / completion information 63,
The status bytes 60, 61, I / O device startup information 62, and channel / path reset instruction (I / O device 6) of each of the above I / O devices 6 generated and updated in response to the execution of the test function task and reset task RCHP) issue / completion information 63,
In the above I / O device status completion status confirmation task, trace in chronological order and reset the channel / path (RCHP).
It is configured to check the validity of the status of each input / output device (I / O) 6 when the instruction is issued.

[0017]

That is, in the present invention, the test function tasks A to
The test processing of the channel / path reset (RCHP) instruction is separated from a and made a dedicated task (reset task).
Then, this dedicated task (reset task) is used for all the channel processors (CH
P) 3 Perform a reset test on the subordinate channel path 40.

Therefore, the centralized management of the channel path 40 becomes possible, and the RCHP between the test function tasks A to
Eliminate instruction conflicts. Further, in the present invention, the input / output device (I /
O) An I / O device status completion status confirmation task (completion confirmation task) for confirming the status of the 6 groups is provided separately from the test function tasks A to a.

According to the present invention, each input / output device
(I / O) 6 status bytes 60 and 61, I / O device activation information when an I / O instruction is issued 62, Channel path reset (RCHP) instruction issuance / completion information 63
(TOD), the status byte 60, 61 of each input / output device (I / O) 6 with the above date and time (TOD) generated and updated corresponding to the execution of the test function task and reset task. The I / O device activation information 62 and the channel / path reset instruction (RCHP) issue / completion information 63 are traced in time series in the I / O device status completion status check task independent of the test function task A to The channel
Check the validity of the status of each I / O device when the path reset (RCHP) instruction is issued.

The trace information includes start information 62, RCHP of input / output instructions for each input / output device (I / O) 6 when a plurality of test function tasks and reset tasks are executed.
The instruction issue / completion information 63, the interrupt status byte 61 of each input / output device, and the end status byte 60 are used to generate information along with the date and time of occurrence (TOD). The RCHP instruction is executed by the input / output device (I
/ O) 6 to determine when it was issued during operation, to determine the completion status of each input / output device (I / O) 6
It is possible to determine whether the termination has been forcibly terminated by the CHP instruction or the expected termination of the test input / output operation by the input / output instruction.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is an explanatory view of the principle of the present invention.
3 and 4 are views showing one embodiment of the present invention.
FIG. 3 shows an example of a trace table, and FIG. 4 shows an operation of chronologically tracing the trace table by the input / output device status completion state confirmation task. .

According to the present invention, in a computer system in which a plurality of input / output devices (I / O) 6 are connected to each channel path 40 via a plurality of channel paths 40, a central processing unit When the (CPU) 1 issues the channel path reset (RCHP) instruction, each input / output device (I /
O) Test each I / O device (I /
O) The channel / path reset task and the task of testing the validity of the completion operation of each input / output device are separated from the plurality of test function tasks a corresponding to 6 so that only one reset task in the system is provided. , An I / O device status completion status confirmation task (completion confirmation task) is provided, and the status byte of each I / O device (I / O) 6
I / O device activation information when an I / O instruction is issued 62, Channel path reset instruction (RCHP) issue / completion information 63
The status of each input / output device (I / O) 6 with the date and time of occurrence (TOD) that has been generated and updated in response to the execution of the test function task and reset task. The means for tracing the bytes 60, 61, the input / output device activation information 62, and the RCHP issue / completion information 63 by the input / output device status completion status confirmation task is a means necessary for carrying out the present invention. Note that the same reference numerals indicate the same object throughout the drawings.

Hereinafter, the method of checking the status of the input / output device according to the present invention will be described with reference to FIGS. First, in the present invention, as shown in FIG. 1, the reset task is configured independently of the test function tasks A to A corresponding to each input / output device (I / O) 6. As shown in FIG. 2, each channel path 40 is selected by each CHPID and the channel path 40 is reset in response to the input / output operation by tasks A to.

In FIG. 2, the reset task manages the reset status of each channel path 40 in a unified manner using a channel path management table shown in FIG. The example of FIG. 2 shows that after resetting each channel path (corresponding to CH1 to CH4) once, the channel path (corresponding to CH5) 40 is currently being reset.

Therefore, each test function task A can execute an input / output instruction without being aware of the RCHP instruction by another test function task B, and the RCHP between the test function tasks A can be executed. Communication for performing exclusive processing of an instruction is not required, and overhead due to the communication can be reduced. Also, the overhead of referring to and updating the channel path management table can be reduced.

Next, referring to FIGS. 3 and 4, the input / output device (I / O) by the input / output device status completion status confirmation task will be described.
The trace operation in the operation completed state will be described. Fig. 3 (a),
As shown in (b), each input / output device (I / O) 6 has an end status byte 60 or an interrupt status byte 61
In the present invention, the date and time of occurrence (TOD) is added to these status bytes 60 and 61.

Also, the date and time of occurrence (TOD) is added to the input / output activation information (see FIG. 3 (c)) 62 when an input / output command is issued to each input / output device (I / O) 6. Furthermore, the date and time of occurrence (TOD) is also added to the RCHP issue / completion information at the time of issuing the RCHP instruction {see FIG. 3 (d)}.

Therefore, when the present invention is implemented, each time the test function tasks A to A are executed, the above-mentioned input / output device (I / O)
The end status byte 60 and interrupt status byte 61 of 6 are updated, and the update date and time (TOD) is recorded.

Each time a reset task that operates independently of the test function tasks A- is executed, the RCH
The P issue / completion information 63, together with its occurrence / completion date and time (TOD), is not shown in the main storage unit (MSU) 2 (see FIG. 5).
Recorded above.

Accordingly, as shown in FIG. 4, the completion status 60 of each input / output device (I / O) 6 or the RCHP issue / completion information 63 is determined by the input / output device status completion status confirmation task of the present invention. By tracing in time series and analyzing the traced information, the validity of the status of the input / output device (I / O) 6 affected by the RCHP instruction can be confirmed. become.

For example, when an input / output command is issued to the input / output device A by the test function task A, if the RCHP command is issued after the end status date and time (TOD), the process ends normally. By confirming that they are valid, their validity can be recognized. If the end status is not set, the validity can be confirmed by confirming the date / time (TOD) of issue / completion of the RCHP instruction.

As described above, the present invention provides a computer system in which a plurality of input / output devices (I / O) 6 are connected to each channel path 40 via the plurality of channel paths 40. Each I / O device when Central Processing Unit (CPU) 1 issues a reset channel path (RCHP) instruction
To test the status of (I / O) 6, check each I / O device.
From a plurality of test function tasks a corresponding to (I / O) 6,
Separate the channel / path reset task and the task to test the validity of the completion operation of each I / O device, and provide only one reset task and the I / O device status completion status confirmation task in the system. Equipment (I
/ O) 6 status bytes 60, 61, I / O device activation information 62 when an I / O instruction is issued, and channel path reset instruction (RCHP) issuance / completion information 63
OD), and the date and time of occurrence that has been generated and updated in response to the execution of the test function task and reset task
Status byte for each input / output device (I / O) 6 with (TOD)
60,61, I / O device startup information 62, RCHP issue / completion information 63
Are traced in chronological order by the above-mentioned I / O device status completion status confirmation task, and the channel / path reset is performed.
The feature is that the validity of the status of each input / output device when the (RCHP) instruction is issued is checked.

[0033]

As described in detail above, in the input / output device state checking method of the present invention, the test for resetting the channel / path is set as the only dedicated task (reset task) in the test system. The management and control of the channel path to be reset can be centrally managed by the reset task, and the processing such as communication between test function tasks and updating of the recording table is not required. For this reason,
The overhead associated with the test for resetting the channel path in the test system is eliminated, and the test for resetting the channel path is efficiently executed.
In addition to the test function task, an I / O device status completion status confirmation task is provided, and the status byte of each I / O device (I / O) 6 and I / O device activation information when an I / O command is issued, Channel path reset instruction (RCH
P) with the date and time of occurrence (TOD) added to the issuance / completion information, and the I / O device (I / O) with the date and time of occurrence (TOD) generated and updated in response to the execution of the test function task and reset task. / O) Trace the 6 status bytes, I / O device startup information, and RCHP issue / completion information in chronological order with the I / O device status completion status confirmation task, and issue the channel path reset (RCHP) instruction. The validity of the status of each I / O device at the time is checked, so that the validity of the status of each I / O device affected by the reset of the channel path, which was difficult in the past, Can be checked efficiently.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 shows an embodiment of the present invention (part 1).

FIG. 3 shows an embodiment of the present invention (part 2).

FIG. 4 shows an embodiment of the present invention (part 3).

FIG. 5 is a diagram for explaining a conventional method of checking the status of an input / output device (part 1);

FIG. 6 illustrates a conventional method for checking the status of an input / output device (part 2).

[Explanation of symbols]

1 Central processing unit (CPU) 2 Main storage device
(MSU) 3 channel processor (CHP) 4 channel device (CH) 40 channel path 5 I / O controller (IOC) 6 I / O device (I / O) 60 Exit status byte 61 Interrupt status byte 62 I / O device activation Information 63 RCHP issue / completion information, a Test function task Reset task I / O device status completion status confirmation task

Claims (1)

(57) [Claims] 1. A method according to claim 1, wherein said plurality of channel paths comprise:
Multiple I / O devices for each channel path (40)
In the computer system to which (I / O) (6) is connected, the central processing unit (CPU) (1) uses the channel path reset (RCHP)
A method for testing the status of each input / output device (I / O) (6) when an instruction is issued, comprising a plurality of test function tasks corresponding to each input / output device (I / O) (6). From (), the channel / path reset task, and
The task of testing the validity of the completion operation of each I / O device is separated, and only one reset task () and the I / O device status completion status confirmation task () are provided in the system. O) (6) status byte (60, 61) and I / O device activation information (6
2), The generation date and time (TOD) is added to the issue / completion information (63) of the channel path reset (RCHP) instruction, which is generated and updated in response to the execution of the test function task () and reset task (). Each of the above input / output devices (I /
O) (6) status byte (60, 61), I / O device startup information
(62), the channel / path reset instruction (RCHP) issuance / completion information (63) is traced in chronological order by the input / output device status completion status confirmation task (), and the channel / path reset (RCHP) instruction is traced. Input / output device (I / O) at the time of issuance of
(6) A method for confirming the status of an input / output device, which comprises checking the validity of the status.