JPH0370263B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] In a data processing device in which a channel control device controls a plurality of channels, when a log factor occurs in a channel, the channel retains log data in the channel, and , create an additional information area on the command from the channel to the channel control device, add the above log out to the above additional information area during other reporting operations, and report to the channel control device. It is disclosed that the log data transfer process during the process is made more efficient.

[Industrial application field]

The present invention relates to a log-out processing method, and particularly to a log-out processing method that efficiently transfers log data from a channel to a channel control device.

[Prior art]

Conventionally, as will be described later in Fig. 1, a central processing unit CPU, a main memory unit MEM, a service processor SVP, a channel control unit CHC, and a channel CH have been used.
Data processing apparatuses having the following are known.

In such a data processing device, when a failure occurs during data transfer between a certain channel and the main storage device, an operation is performed as shown in the example of operation shown in FIG.

That is, if a failure occurs while the channel CH is transferring data between it and the main memory MEM as shown in Figure 3, the data transfer will be stopped and the channel CH will not be able to create log data. ,
The data is transferred to the channel control device CHC together with the log report. The channel CH then creates a channel status word by processing corresponding to the termination interrupt and sends it to the channel controller.
Issue an interrupt request to CHC. This interrupt request is transferred to the central processing unit CDU side and
The CPU receives the channel status word by processing the interrupt and, if necessary, causes the service processor SVP, for example, to reap detailed log data on the channel controller CHC.

[Problem that the invention seeks to solve]

Conventionally, the above operation was performed, so (i) the channel CH had to transfer the log information twice to the channel control device CHC, and (ii) there were multiple channel CHs. As the frequency of log requests increases, this can cause system
(iii) the ability for each channel to generate log requests to be
There were problems such as an increase in the amount of hardware needed to be installed on the CH.

[Means for solving problems]

The present invention solves the above-mentioned problems, and FIG. 1 shows a basic configuration diagram of the present invention. In the figure, 1 is a central processing unit, 2 is a main storage device, 3 is a service processor, 4 is a channel control device, 5 is a channel, and 6 is a
is the system bus, and 7 is the log area.
What data is held, 8 represents a channel status word with additional information.

[Effect]

In the figure, all control operations for each channel 5-i are performed via the channel control device 4. However, data transfer between channel 5-i and main storage device 2 can be performed directly. This is to improve the transfer performance of channel 5-i.

The channel control device 4 receives a startup instruction from the central processing unit 1, analyzes the startup instruction, performs startup processing for the channel 5-i based on the analysis result, accepts an interrupt request from the channel 5-i, and performs processing on the central processing unit 1. It performs operations such as generating an interrupt request to the side, collecting and storing fault information from each channel 5-i (in the log area 7), and reporting to the service processor 3.

In the case of the present invention, for example, a channel in which a failure occurs does not immediately send the log data to the channel control device 4, but retains the log data within itself. Then, in some other reporting operation to the channel control device 4, such as when reporting completion or requesting an interrupt, the log data is notified in the form of information 8 shown in FIG.

a. When reporting completion, the command corresponding to the completion report and CPU interface information are combined and notified; b. When requesting an interrupt, the command corresponding to the interrupt request and information related to it are combined and notified. and will be notified.

In the case of the present invention, #2 byte to #5 are added to the #0 byte and #1 byte.
An additional information area for the byte is prepared. and,
The log data is written in the area and notified to the channel control device 4 in a form corresponding to other reporting operations as described above (in a form corresponding to the completion report and interrupt request). The log data is in log area 7
held on top.

〔Example〕

FIG. 2 shows an example of the operation of one embodiment of the present invention. As will become clear when compared with Figure 3, the log
Data transfer is blocked. That is, when a log factor such as a failure occurs while data is being transferred between channel 5-i and main storage device 2, the data transfer is stopped and the log data is transferred to channel 5-i. is held within i. When the channel 5-i issues an interrupt to report completion, it transfers log data as shown in the information 8 above to the channel control device 4 in addition to the interrupt request command. The channel control device 4 is a rogue
The data is held in the log area 7 shown in FIG. 1, and an interrupt is issued to the central processing unit 1 side. The central processing unit 1 then reads the channel status word stored in the main memory in the processing for dealing with the interrupt, and if necessary, the service processor 3 reads the channel status word from the log area 7.
Read log data within.

Note that although the case shown in FIG. 2 represents the case where the notification is made in response to the completion report, the notification is not limited to this.

〔Effect of the invention〕

As described above, according to the present invention, the system bus is no longer used only for transferring log data, and the conventional problems are solved.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the basic configuration of the present invention, FIG. 2 is an example of the operation of an embodiment of the present invention, and FIG. 3 is an example of the operation of the conventional case. In the figure, 1 is the central processing unit, 2 is the main memory, and 3
is a service processor, 4 is a channel controller, 5 is a channel, 6 is a system bus, and 8 is a channel status word with additional information added.

Claims (1)

[Scope of Claims] 1. The channel control device 4 comprises at least a central processing unit 1, a main storage device 2, a channel control device 4, and a plurality of channels 5-i controlled by the channel control device 4. in the data processing device which notifies the central processing unit 1 side by writing a channel status word indicating the state of the channel 5-i in the main storage device 2, from the channel 5-i to the channel control device. channel 5 for interrupt requests or completion reports sent to channel 4.
-i is configured to add additional information that describes detailed status information including detailed information on the failure status of channel 5-i, and retains the log data on channel 5-i when a log factor occurs in channel 5-i. and transfers the log data as additional information during other reporting operations to the channel controller 4, and the channel controller 4 notifies the channel status word at that time, and then the central processor 1 A logout processing method characterized in that the above-mentioned additional information is read by the user.