JPS603222B2 - Logout method in information processing system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides, in an information processing system having a central processing unit and a service processor, state information of the central processing unit logged out by the service processor when an error occurs in the central processing unit. The present invention relates to a logout method in an information processing system in which information is transferred to a central processing unit in response to a request from the device.

When a machine check interrupt occurs in an information processing apparatus, it is customary to perform a retry to automatically recover the system.

In order to investigate a hardware failure or a location where a failure is likely to occur in an information processing apparatus, it has been conventionally practiced to log out the internal state prior to performing a retry. In the conventional logout method, a copy register is provided to hold the internal state, and when a machine check state is entered, the contents of the copy register are held in the main memory or the like. Such a logout method may require an enormous amount of hardware such as copy registers. In addition, when an error occurs in an information processing device, it is impossible to save the internal state on your own while preserving the state at the time of error occurrence without special hardware such as a copy register. , is impossible. For example, when an error occurs in the memory control unit, it is impossible to maintain the state of the memory control unit at the time the error occurred and write its internal state to the memory. By the way, recently, a service processor has been added to the main system's central processing system.

This service processor has a console function, display function, and diagnostic function. However, this service processor is about the size of a minicomputer, and its capabilities are inferior to that of the main system's central processing unit. This can be done significantly more efficiently than using a service processor. The present invention is based on the above idea, and in order to omit a hardware mechanism dedicated to logout, a service processor is used to log out the main body central processing system, and the data logged out by the service processor is The purpose is to provide a logout method directly from the main system's central processing center.

Therefore, the logout method in the information processing apparatus of the present invention includes a service processor, a central processing unit having an error analysis function, a scanout mechanism that scans out the internal state and information of the central processing unit, and the above-mentioned service processor. a console data register accessible by a processor and a central processing unit; a notification means capable of notifying the central processing unit of log termination and log data termination from the service processor to the central processing unit; and the central processing unit. and a completion interrupt notification means for sending a log request interrupt from the central processing unit to the service processor, and a completion interrupt notification means for sending a completion interrupt from the central processing unit to the service processor, , upon receiving the log request fee from the central processing counterfeiter, activates the scanout mechanism to perform the scanout operation, imports the scanned data into its own memory, and after the scanout is completed. Notify the central processing unit of the end of the log and set the central processing unit to a clock start state,
When a completion interrupt is received from the central processing unit, it is checked whether the logout data transfer request flag in the console data register is on, and if the logout data transfer request flag is on, the scan is performed. The logout data obtained as a result of is set in the console data register, and when all the logout data has been transferred, the end of the log data is notified to the central processing unit, and the central processing unit If it is determined that the log should not be suppressed when a log is detected, it will stop the clock after notifying the service processor of the log request interrupt, and upon receiving the end of log from the service processor, it will start retrying. After the retry is completed, it is determined whether or not to start the log. If the log is to be started, the logout data transfer request flag in the console data register is turned on, and the logout data is stored in the console data register. A long-out method in an information processing system characterized by being configured to read and write this to main memory when it is set, and then perform error analysis. Hereinafter, the present invention will be explained with reference to the drawings. 1st
The figure is a block diagram of one embodiment of the present facial expression, and Figure 2A and Mouth are a flowchart explaining its operation.

In Figure 1, 1 is a central processing unit (hereinafter abbreviated as CPU)
, 2 is a service processor (hereinafter abbreviated as SVP), 3 is a scanout address, register (hereinafter abbreviated as SOA), 4 is a counter, 5 is a scanout data register (hereinafter abbreviated as SOD), 6 is a console・Data register (hereinafter abbreviated as CDR), 6a is the logout data transfer request flag, 7 is the micro service register (
(hereinafter abbreviated as MSR), 8 is a command register (hereinafter CM
), ClogR is CPU log request interrupt, COMP
indicate completion interrupts indicating that the log request has ended. Next, the operation shown in FIG. 1 will be explained with reference to FIG. 2, A and mouth.

Figure 2A and mouth are used together to explain the operation of the system in Figure 1. When an error occurs in the CPUI and a machine check interrupt occurs, the CPUI decides whether to request a log. For example, if the location of the error occurrence is clear, log requests are suppressed. When sending a log request, the CPUI turns on the CPU log request CI0 bait and sets error cause 0. "Error cause 0" is the error cause before retry execution. After performing the above operations, the CPUI clock is stopped. SVP
2 receives a log request interrupt from the CPUI, investigates the cause of the error, determines the detection point to be scanned out, and
Initiate logout. Logout is started by setting the start address of the scan address and the block length to be continuously scanned out in the SOA 3. 1
The counter 4 is counted up for each block, and the scan address is thereby updated.

Scanout data read from the detection point specified by the scan address is written to SOD5. S.O.
When scanout data is written to all bits of D5, SVP2 takes the contents of SOD5 into memory. As described above, the scanout ends when the specified block length of scanout data is enclosed. When the scanout is completed, SVP2 uses MSR7 and CM old8 to notify CPU1 that logging has ended and starts the CPU clock. When the log end is notified and the clock starts,
An error interrupt occurs and a retry is performed. If eight retries are unsuccessful or if damage occurs, the log request interrupt CIo station is turned on and error cause 1 is set. "Error cause 1" is the cause of the error that occurred after the retry. When the SVP 2 receives the log request interrupt CIo, it logs out as described above and notifies the CPUI of the end of the log.
Scanout data based on error cause 0 and scanout data based on error cause 1 are separately stored in the memory. When the CPUI receives the olog end, it checks whether the data logged out by the SVP2 should be transferred to itself. This is done in a process called "log start" at the beginning of Figure 2. When requesting logout data transfer, the logout data transfer request flag 6a is turned on. The 15th bit of CDR is used as the logout data transfer request flag 6a. After the CPUI performs log start processing, it sends a completion interrupt COMP to SVP2. When SVP2 receives the completion interrupt COMP, it checks whether the logout data transfer request flag 6a is on or not, and performs logout.
When the data transfer request flag 6a is set, that is, when it is on, logout data is set in the CDR 6. The logout data in CDR6 is
and stored in main memory (not shown). CPUUI logs out. Perform error analysis using the data. The effect analysis can also be performed by SVP2. When all the logout data has been transferred, the end of the log data is notified to the CPUI, and then the end of the log is notified to the CPUI. Upon receiving these notifications, the CPUI sends a completion interrupt COMP to SVP2. When this completion interrupt COMP is received, SVP
2 returns to the main routine. As is clear from the above description, according to the present invention, it is possible to omit the dedicated logout hardware conventionally provided on the central processing unit side, to perform detailed logout, and to transfer logout data to the central processing unit side. Since a means for transmitting the data to the central processing unit is provided, effects such as error analysis can be efficiently performed on the central processing unit side.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a flow chart explaining the operation of the system shown in FIG. DESCRIPTION OF SYMBOLS 1...Central processing unit, 2...Service processor, 3...Scanout address register, 4...Power counter, 5...Scanout data register, 6...Console data register, 7...Micro - Service register, 8...command register. Boo Shiryo Z Core (1) Na Z Wakikawa)

Claims (1)

[Claims] 1 A service processor, a central processing unit having an error analysis function, a scanout mechanism for scanning out internal state information of the central processing unit, and a console accessible by the service processor and central processing unit. a data register; a notification means capable of notifying the central processing unit of the end of the log sent from the service processor to the central processing unit and the end of log data; and completion interrupt notification means for sending a log request interrupt from the central processing unit to the service processor, and the service processor receives the log request interrupt from the central processing unit. Upon receiving the above, the scan-out mechanism is activated to perform a scan-out operation, the scan-out data is taken into its own memory, and after the scan-out is completed, it notifies the central processing unit that the log has ended, and also When the central processing unit is set to the clock start state and a completion interrupt is received from the central processing unit, it is checked whether the logout data transfer request flag in the console data register is on or not. If it is on, the logout data obtained as a result of scanout is set in the console data register, and when all the logout data has been transferred, the central processing unit is notified of the end of the log data. If the central processing unit determines that the log should not be suppressed when an error is detected, the central processing unit notifies the service processor of a log request interrupt and then stops the clock, and prevents the service processor from processing the log. When the log end is received, a retry is executed, and after the retry is completed, it is determined whether the log should be started or not. If the log is to be started, the logout data transfer request flag in the console data register is turned on, and the logout data transfer request flag is turned on in the console data register. - A logout method for an information processing system characterized by being configured such that when logout data is set in a data register, it is read and written to main memory, and then an error analysis is performed.