JP6408498B2 - Suspicious diagnosis circuit, information processing apparatus, suspected diagnosis method and program - Google Patents

Description

  The present invention relates to a technique for identifying a suspicious object of an error when accessing a device of a device that connects various devices via a bus.

  In devices such as computers that connect devices such as memory and sensors via the bus, a retry function is provided in the event of an access error to a CPU (Central Processing Unit) device so as not to hinder system operation. ing. There are various standards for buses, such as a serial data bus such as an IIC (Inter-Integrated Circuit, also abbreviated as I2C) bus. In the I2C bus, it is possible to access a device to be connected at a predetermined time interval and perform polling monitoring of the device. In addition to polling monitoring, improving the reliability of access to devices via the bus is essential for stable system operation.

  In order to improve the reliability of connection via a data bus, Patent Document 1 discloses a bus error detection processing device that analyzes and processes an error during access. The bus error detection processing device disclosed in Patent Document 1 includes bus error detection means for detecting and identifying errors, and error data processing means for performing statistical analysis processing of error contents. Furthermore, an error processing unit that performs data retransmission processing, alarm processing, and communication with an external device as necessary according to the error content, and error data storage unit that stores error information are provided.

JP 2001-75878 A

  However, the technique disclosed in Patent Document 1 has the following problems.

  The bus error detection processing device of Patent Literature 1 statistically processes errors of devices connected to the bus for each error type based on the number of retries and errors. In this process, a process for discriminating whether or not an error has occurred regularly is not performed. For this reason, there is a shortage of information when specifying the suspicious object of the error, and the accuracy of specifying the suspicious object is reduced. That is, in Patent Document 1, a common part that acts in common on a plurality of devices connected to the bus and is not accessed by the CPU like other devices, such as a power source, cannot be specified as a suspicious target.

  The present invention has been made in view of the above problems, and its purpose is to make it possible to distinguish whether or not a bus error has occurred periodically, thereby identifying the suspicious object of the error. Is to improve.

  The suspected diagnosis circuit of the present invention compares the number of access retries with a first threshold value and a second threshold value greater than the first threshold value based on success or failure of access to a device connected to the bus. Means, a flag management means for setting a flag and a time when the number of retries is equal to or greater than the first threshold, and resetting the flag after a predetermined time has elapsed from the time; and the number of retries is the first If the threshold value is equal to or greater than 2, a suspect identification unit that identifies the suspect object based on the success or failure of the access and the flag.

  The information processing apparatus of the present invention compares the access retry count with a first threshold value and a second threshold value greater than the first threshold value based on success or failure of access to a device connected to the bus. Means, a flag management means for setting a flag and a time when the number of retries is equal to or greater than the first threshold, and resetting the flag after a predetermined time has elapsed from the time; and the number of retries is the first If the threshold is equal to or greater than 2, a suspect diagnosis circuit having suspect identification means for identifying the suspect object based on the success or failure of the access and the flag is provided.

  The suspected diagnosis method of the present invention compares the number of access retries with a first threshold and a second threshold greater than the first threshold based on the success or failure of access to a device connected to the bus, If the number of retries is greater than or equal to the first threshold, set a flag and time, reset the flag that has passed a predetermined time or more from the time, and if the number of retries is greater than or equal to the second threshold, The suspected object is specified based on the success or failure of access and the flag.

  The suspected diagnosis program of the present invention is a process for comparing the number of access retries with a first threshold value and a second threshold value greater than the first threshold value based on success or failure of access to a device connected to the bus. When the number of retries is greater than or equal to the first threshold, a process for setting a flag and time, a process for resetting the flag that has passed a predetermined time from the time, and the number of retries are the second If it is equal to or greater than the threshold, the computer is caused to execute a process of identifying the suspected object based on the success or failure of the access and the flag.

  According to the present invention, it becomes possible to distinguish whether or not a bus error has occurred periodically, and the accuracy of specifying the error suspect can be improved.

It is a block diagram which shows the structure of the doubt diagnosis circuit of the 1st Embodiment of this invention. It is a block diagram which shows the structure of the doubt diagnosis circuit of the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the suspicious diagnosis circuit of the 3rd Embodiment of this invention. It is a flowchart which shows operation | movement of the doubt diagnosis circuit of the 3rd Embodiment of this invention. The example of information for the suspicion diagnosis of the suspicion diagnosis circuit of the 3rd Embodiment of this invention is shown. The example of information for the suspicion diagnosis of the suspicion diagnosis circuit of the 3rd Embodiment of this invention is shown. The example of information for the suspicion diagnosis of the suspicion diagnosis circuit of the 3rd Embodiment of this invention is shown. The example of information for the suspicion diagnosis of the suspicion diagnosis circuit of the 3rd Embodiment of this invention is shown.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the preferred embodiments described below are technically preferable for carrying out the present invention, but the scope of the invention is not limited to the following.
(First embodiment)
FIG. 1 is a block diagram showing a structure of a suspicious diagnosis circuit according to the first embodiment of the present invention. The suspicious diagnosis circuit 1 according to the present embodiment compares the number of access retries with a first threshold value and a second threshold value that is larger than the first threshold value based on the success or failure of access to a device connected to the bus. Means 2 are included. Furthermore, when the number of retries is greater than or equal to the first threshold, the flag management means is provided for setting a flag and time and resetting a flag that has passed a predetermined time from the time. In addition, when the number of retries is equal to or greater than the second threshold, there is a suspicious identification unit that identifies the suspicious object based on the success or failure of the access and the flag.

  In the suspicious diagnosis circuit 1 of this embodiment, it is possible to know whether or not a bus error has occurred periodically based on the presence or absence of a flag.

Therefore, according to the present embodiment, it becomes possible to distinguish whether or not a bus error has occurred regularly, and the accuracy of specifying the error suspect can be improved.
(Second Embodiment)
FIG. 2 is a block diagram showing the structure of a suspicious diagnosis circuit according to the second embodiment of the present invention. The suspicious diagnosis circuit 5 of this embodiment includes retry management means 6 and suspicion specifying means 7. The retry management means 6 compares the number of access retries with a first threshold value and a second threshold value that is larger than the first threshold value, based on the success or failure of the CPU access to the device connected to the bus. Further, when the number of retries is equal to or greater than the first threshold, a flag and time are set. Further, a flag that has passed a predetermined time from the time is reset. When the number of retries is greater than or equal to the second threshold, the suspicious identification means 7 identifies the suspicious object based on the success or failure of the access and the flag.

  In the suspicious diagnosis circuit 1 of this embodiment, it is possible to know whether or not a bus error has occurred periodically based on the presence or absence of a flag.

Therefore, according to the present embodiment, it becomes possible to distinguish whether or not a bus error has occurred regularly, and the accuracy of specifying the error suspect can be improved.
(Third embodiment)
FIG. 3 is a block diagram showing the structure of a suspicious diagnosis circuit according to the third embodiment of the present invention. In FIG. 3, a CPU, a bus, a device, and a power source included in the information processing apparatus 100 incorporating the suspected diagnosis circuit 10 according to the present embodiment are also illustrated. The suspicious diagnosis circuit 10 of this embodiment includes a retry management unit 20 and a suspicious identification unit 30. The retry management unit 20 includes a comparison unit 21, a flag management unit 22, a time management unit 23, and a storage unit 24.

  The suspicious diagnosis circuit 10 can be realized by being incorporated in a CPU on which a master device (Master Device) operates and executing a program on the CPU. The suspicious diagnosis circuit 10 is incorporated in the information processing apparatus 100 such as a server having a CPU, but is not limited thereto. The suspicious diagnosis circuit 10 is a device independent of the information processing device 100 by enabling acquisition of success / failure information when the CPU tries to access a device (slave device, slave device) connected to the bus. It can also be.

  The CPU is connected to the devices A, B, C, and D via the bus A and controls them. The CPU controls the power source A that supplies power to the devices AD. Further, the CPU is connected to the device E, device F, device G, and device H via the bus B and controls them. The CPU controls a power supply B that supplies power to the device E-H. The bus A and the bus B can be various serial buses and parallel buses.

  For example, an I2C bus can be used for the bus A and the bus B. At this time, the CPU controls each device connected to the I2C bus as a master device by BMC (Baseboard Management Controller) firmware. In the I2C bus, the CPU can poll each device by accessing each connected device at a certain time interval.

  The power source A is connected to the devices A-D via the bus A and supplies power to the devices A-D. The power source A is a common part that acts in common with the devices AD. The power source B is connected to the device E-H via the bus B and supplies power to the device E-H. The power source B is a common part that acts in common with the devices E-H.

  In FIG. 3, the CPU is connected to the devices AD and the power source A via the bus A, and is connected to the devices EH and the power source B via the bus B, but is not limited thereto. The number of buses and the number of devices can be arbitrary. The device can be various memories, ICs (Integrated Circuits), sensors, and display devices, but is not limited thereto.

  The CPU accesses the devices A to D via the bus A and the devices E to H via the bus B. The CPU periodically accesses each device in order at regular time intervals. The time interval at which the CPU accesses each device and the access order are not limited to one. The time interval accessed by the CPU and the access order can be arbitrarily changed. At this time, the CPU provides the suspect diagnosis circuit 10 with success / failure information indicating whether the access to each device has succeeded or failed.

  The CPU can determine whether the access has succeeded or failed based on whether an ACK (Acknowledgement) is returned from the device or a NACK (Negative Acknowledgement) is returned. The CPU can also determine whether or not the reply from the device has exceeded the time limit or whether or not the data returned from the device to the CPU is within the expected value range.

  If the access fails, the CPU re-executes the access (retry) or determines the access failure, that is, the suspected error, based on the instruction provided from the suspect diagnosis circuit 10 that has received the success / failure information of the access failure from the CPU. An alarm can be sent.

  The suspicious diagnosis circuit 10 receives access success / failure information from the CPU and notifies the CPU of an access retry instruction or a target to be suspected of causing an error. In the suspicious diagnosis circuit 10 shown in FIG. 3, the devices A to D and the common part power supply A connected to the bus A, the devices E to H connected to the bus B, and the common part power supply B can be suspected. .

  The common part is not limited to the power source, and examples thereof include an air cooling fan and a cooling unit that cool each device in common. Further, the common part may not be connected to the bus.

  Below, the function of the component of the suspicious diagnosis circuit 10 is demonstrated.

  The comparison unit 21 compares the number of access retries to the device with a temporary retry threshold (first threshold) based on the access success / failure information provided from the CPU. The comparison unit 21 also compares the number of retries for accessing the device and the retry threshold (second threshold) based on the success / failure information provided by the CPU. When the number of retries is less than the retry threshold, the comparison unit 21 instructs the CPU to retry access. Further, when the number of retries is equal to or greater than the retry threshold, the comparing unit 21 determines that access to the device is impossible.

  The temporary retry threshold (first threshold) is set to a value smaller than the retry threshold (second threshold). The retry threshold is a threshold serving as a reference for the comparison unit 21 to determine that the device cannot be accessed when the number of retries exceeds this value. On the other hand, the temporary retry threshold is a threshold that serves as a reference indicating a state in which a retry is performed within a range that does not reach the number of retries determined as inaccessible. Note that the retry threshold and the temporary retry threshold may be different values for each device, or may be the same value.

  The flag management unit 22 sets (registers) a retry flag when the number of retries is equal to or greater than the temporary retry threshold. Furthermore, the flag management means 22 sets the time when the retry flag is set. At this time, the flag management unit 22 stores the retry flag and time in the storage unit 24.

  The flag management means 22 also resets (deletes) a flag that has passed a predetermined time or more from the time when the retry flag was set. At this time, the flag management unit 22 deletes the retry flag and the time when the retry flag was set from the storage unit 24.

  The retry flag is a flag indicating a state in which a retry is performed within a range that does not reach the number of retries determined as inaccessible. The retry flag is reset when a predetermined time or more elapses from the set time. Therefore, if the retry flag is set, it can be determined that an access failure has occurred periodically. On the other hand, if the retry flag is not set, it can be determined that an access failure does not occur periodically.

  The time management unit 23 includes a timer and notifies the flag management unit 22 whether or not a predetermined time or more has elapsed from the time when the retry flag stored in the storage unit 24 is set. Upon receiving the notification, the flag management means 22 resets the flag when a predetermined time or more has elapsed.

  The storage unit 24 stores the access success / failure information, the retry count, the retry threshold value, the temporary retry threshold value, the retry flag, and the time when the retry flag is set for each device. “1” can be stored when the retry flag is set, and “0” can be stored when the retry flag is not set. The access success / failure information to be stored can be the latest success / failure information. The access success / failure information may be stored together with time. The comparison means 21 can provide access success / failure information, time and retry count information. As the storage unit 24, a storage medium such as a semiconductor memory or an HDD (Hard Disk Drive) can be used.

  In the suspicious identification means 30, the comparison means 21 compares the retry count of the access with the retry threshold, and if the retry count is equal to or greater than the retry threshold, it acquires information such as a retry flag stored in the storage means 24. Identify the subject that is suspected of causing the error. Here, the devices A to D and the common part power source A connected to the bus A, the devices E to H connected to the bus B, and the common part power source B can be suspected. In other words, if the suspect identification means 30 confirms the retry flag set even in another device connected to the same bus as the bus to which the device determined to be inaccessible is connected, power is commonly supplied to these devices. The power supply to be supplied can be identified as a subject of error.

  The suspicious identification means 30 provides the identified suspicious target information to the CPU. Based on the information provided from the suspicious diagnosis circuit 10, the CPU can issue an alarm indicating the suspicious object of the error.

  FIG. 4 is a flowchart showing the operation of the suspicious diagnosis circuit 10 of the present embodiment. The flowchart in FIG. 4 starts after the suspected diagnosis circuit 10 receives access success / failure information from the CPU. The flowchart of FIG. 4 shows the operation of the suspicious diagnosis circuit 10 when the CPU accesses one of the devices A to H. Since the CPU accesses each device, each time the CPU accesses each device. The flowchart of FIG. 4 is executed. Access to the device of the CPU is assumed to be access at the time of polling monitoring, but is not limited to this.

  In step S01, when receiving the access success / failure information, the comparison unit 21 determines whether or not the access to the device is successful based on the access success / failure information. If successful (YES), the process proceeds to step S02. If not (NO), the process proceeds to step S03. Further, the comparison unit 21 stores the current access success / failure information in the storage unit 24.

  In step S02, the comparison unit 21 resets the number of retries stored in the storage unit 24, and the flag management unit 22 resets the retry flag stored in the storage unit 24, and the process ends.

  In step S <b> 03, the comparison unit 21 increments the number of retries for accessing the device and stores it in the storage unit 24.

  In step S04, the flag management unit 22 confirms whether or not the retry flag is set in the storage unit 24. When the retry flag is set (YES), the process proceeds to step S05. When the retry flag is not set (NO), the process proceeds to step S07.

  In step S05, the time management unit 23 checks whether or not a predetermined time (interval time, Interval Time) or more has elapsed from the time when the retry flag is set, and notifies the flag management unit 22 of it. When the predetermined time or more has elapsed (YES), the process proceeds to step S06. If the predetermined time has not elapsed (NO), the process proceeds to step S10.

  Note that if step S05 is NO, that is, if the retry flag is set and the predetermined time or more has not elapsed, a new time may be set before proceeding to step S10. In this method, the time when an access failure occurs before a predetermined time has elapsed after the retry flag is set is updated as a new retry flag setting time. For example, when the interval time is set to 24 hours, when 14 hours have elapsed from the already set time, the remaining time is 10 hours. If a new time is set at this time, the remaining time becomes 24 hours.

  In step S06, the flag management unit 22 resets the retry flag and proceeds to step S10.

  In step S07, the comparison unit 21 compares the number of retries for accessing the device with a temporary retry threshold (first threshold). When the number of retries is equal to or greater than the temporary retry threshold (YES), the process proceeds to step S08. When the number of retries is less than the temporary retry threshold (NO), the process proceeds to step S13.

  In step S08, the flag management unit 22 sets a retry flag and proceeds to step S09.

  In step S09, the flag management unit 22 sets the time in which the retry flag was set in step S08 in the time management unit 23, and proceeds to step S10.

  In step S10, the comparison unit 21 compares the number of retries for accessing the device with the retry threshold (second threshold). If the number of retries is equal to or greater than the retry threshold (YES), the comparison unit 21 determines that the device cannot be accessed, and the process proceeds to step S11. When the number of retries is less than the retry threshold (NO), the process proceeds to step S13.

  In step S <b> 11, the suspect identification unit 30 acquires access success / rejection information and retry flag information necessary for identifying the suspected object from the storage unit 24. At this time, information on the device for which the number of retries is greater than or equal to the retry threshold in step S10 and information on other devices connected to the bus A and bus B are acquired together, and the process proceeds to step S12.

  In step S12, the suspicious identification means 30 identifies the suspicious object of the error based on the access success / failure information and the retry flag information. The target that can be specified as the suspicious target here is the device AD connected to the bus A and the power source A of the common part, and the device EH connected to the bus B and the power source B of the common part.

  First, the suspicious identification means 30 identifies the device whose access success / failure information is negative among the devices A-H as the suspicious target. In this case, regardless of the retry flag, the device can be identified as a suspected object because the number of retries is equal to or greater than the retry threshold.

  Next, when the retry flag is set in all or a plurality of devices connected to the same bus, the suspicious identification means 30 identifies a common part that acts in common on the devices connected to the bus as a suspicious target. . In this case, a power source that supplies power to each device in common via the bus can be specified as a suspicious object. The common parts such as the power supplies A and B are not the objects that the CPU regularly accesses like the other devices A-H. However, the suspicious identification means 30 can identify the common part as the suspicious object based on the setting status of the retry flag of each device.

  The suspicious identification means 30 notifies the CPU of the identified suspicious object, and ends.

  In step S13, the comparison unit 21 instructs the CPU to retry access, and the process ends.

  In step S02, the flag management unit 22 does not have to reset the retry flag. If the retry flag is not reset, when the access fails after the next time, the retry flag is handled starting from the time when the retry flag was last set. On the other hand, when the retry flag is reset, when the access fails after the next time, the retry flag is handled starting from the time when the new access failure occurs. Whether or not to reset the retry flag can be selected based on the design policy of the system.

  Next, the operation of step S12 in which the suspicious identification unit 30 identifies the suspicious object will be specifically described. Prior to step S <b> 12, in step S <b> 11, the suspect identification unit 30 acquires retry flag information and access success / failure information necessary for identifying the suspect target from the storage unit 24. 5A, FIG. 5B, FIG. 5C, and FIG. 5D show examples of the retry flag for each device and the latest access success / failure information when identifying the suspected object among the information stored in the storage unit 24. FIG.

  FIG. 5A shows an example in which the CPU has successfully accessed each device. FIG. 5A shows a case where the CPU has successfully accessed and no retry has occurred. The retry flag is displayed as “0” and the access is displayed as “success”. 5A is information stored in the storage unit 24, but is information when access is successful, and is not read out in the flowchart of FIG. For example, the user of the information processing apparatus 100 can obtain the information from the storage unit 24 separately from the flowchart of FIG. 4 for the purpose of confirmation.

  FIG. 5B shows a case where the CPU fails to access the device F and the comparison unit 21 determines that access to the device F is impossible. In the device F, the access is “failure” and the retry flag is “1”. This indicates that the device F has been retried periodically. At this time, the suspicious identification means 30 sets the device F as a suspicion target. On the other hand, in the device C, the access is “success” and the retry flag is “1”. This indicates that the device C is not determined to be inaccessible but is retried periodically. At this time, the suspicious identification means 30 does not make the device C a suspicious object.

  The retry flags of devices A, B, and D connected to the same bus A as device C are “0”. The retry flags of the devices E, G, and H connected to the same bus B as the device F are “0”. These indicate that the devices A, B, D, E, G, and H are not periodically retried. At this time, the suspicious identification means 30 does not target the devices A, B, D, E, G, and H. Further, the suspicious identification means 30 does not consider the power source A and the power source B that supply power to the devices A, B, D, E, G, and H as suspicious targets.

  As described above, the suspicious identification unit 30 identifies the device F as an error suspicious object based on the success or failure of the access and the retry flag.

  FIG. 5C shows a case where the CPU fails to access the device F and the comparison unit 21 determines that access to the device F is impossible. In the device F, the access is “failure” and the retry flag is “0”. This indicates that the device F has failed to access periodically after the retry flag has been reset and has not been retried periodically. At this time, the suspicious identification means 30 sets the device F determined by the comparison means 21 to be inaccessible as a suspicion target. In FIG. 5C, the other devices AE, G, and H are in the same state as in FIG. 5B.

  As described above, the suspicious identification unit 30 identifies the device F as an error suspicious object based on the success or failure of the access and the retry flag.

  FIG. 5D shows a case where the CPU has failed to access device A and comparison means 21 determines that access to device A is not possible. In the device A, the access is “failure” and the retry flag is “1”. This indicates that the device A has been retried periodically. At this time, the suspicious identification means 30 makes the device A a suspicious object.

  The retry flags of devices B, C, and D that are connected to the same bus A as the device A and have been successfully accessed are all “1”. On the other hand, the retry flags of the devices E, F, G, and H that are connected to the bus B and have been successfully accessed are all “0”. That is, since retry is regularly performed in all of the devices A to D connected to the bus A, the suspicious identification unit 30 can identify the power source A common to the devices A to D as the suspicion target. It becomes.

  Even if the retry flag is not “1” in all the devices connected to the bus A, for example, when the retry flag is “1” in more than half of the devices, the power source is specified as the suspicious target. The reference can also be set in advance based on past results.

  As described above, the suspicious identification means 30 identifies the power source A that supplies power to the device connected to the bus A together with the device A as the suspicious target of the error based on the success or failure of the access and the retry flag.

  The suspicious diagnosis circuit 10 of the present embodiment resets the retry flag that has passed a predetermined time or more from the time when the retry flag was set, so that it can know whether or not a bus error has occurred periodically. As a result, it is possible to increase information for specifying the suspected object of the error, and it is possible to extend the suspected object to a common part such as a power source other than the device that is making an error response.

  As described above, according to the present embodiment, it becomes possible to distinguish whether or not a bus error has occurred periodically, and the accuracy of identifying the suspicious object of the error can be improved.

  The present invention is not limited to the above embodiment, and various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the present invention.

Moreover, although a part or all of said embodiment may be described also as the following additional remarks, it is not restricted to the following.
(Appendix 1)
Comparing means for comparing the number of retries of the access with a second threshold value greater than the first threshold value based on success or failure of access to a device connected to the bus;
Flag management means for setting a flag and time if the number of retries is greater than or equal to the first threshold, and resetting the flag when a predetermined time or more has elapsed from the time;
A suspect diagnosis circuit comprising suspect identification means for identifying an suspect object based on the success or failure of the access and the flag when the number of retries is equal to or greater than the second threshold.
(Appendix 2)
There are a plurality of the devices,
The predetermined common part acts in common on the plurality of devices,
The suspect diagnosis circuit according to claim 1, wherein the suspect identification unit identifies the common part as the suspect object when the flags of a plurality of the devices are set.
(Appendix 3)
The suspicious diagnosis circuit according to appendix 2, wherein the common unit includes a power source.
(Appendix 4)
4. The suspicious diagnosis circuit according to claim 1, further comprising time management means for detecting an elapsed time from the time.
(Appendix 5)
5. The suspicious diagnosis circuit according to claim 1, further comprising a storage unit that stores the flag.
(Appendix 6)
6. The suspicious diagnosis circuit according to claim 1, wherein the comparison means increments the number of retries and compares the first threshold value with the second threshold value when the access is denied.
(Appendix 7)
7. The suspicious diagnosis circuit according to claim 1, wherein the comparison means resets the number of retries when the access is successful.
(Appendix 8)
8. The suspicious diagnosis circuit according to claim 1, wherein the flag management means resets the retry flag when the access is successful.
(Appendix 9)
9. The suspicious diagnosis circuit according to claim 1, wherein the time includes a time when the flag is set.
(Appendix 10)
Based on the success or failure of the access to the device connected to the bus, the number of retry times of the access is compared with a first threshold value and a second threshold value that is larger than the first threshold value, and the number of retry times is the first threshold value. A retry management means for setting a flag and a time if the threshold is greater than or equal to a threshold, and resetting the flag after a predetermined time or more from the time;
A suspect diagnosis circuit comprising suspect identification means for identifying an suspect object based on the success or failure of the access and the flag when the number of retries is equal to or greater than the second threshold.
(Appendix 11)
There are a plurality of the devices,
The predetermined common part acts in common on the plurality of devices,
The suspicious diagnosis circuit according to appendix 10, wherein the suspicious identification means identifies the common part as the suspicious object when the flags of a plurality of the devices are set.
(Appendix 12)
The suspicious diagnosis circuit according to claim 11, wherein the common unit includes a power source.
(Appendix 13)
13. The suspicious diagnosis circuit according to any one of appendices 10 to 12, further comprising time management means for detecting an elapsed time from the time.
(Appendix 14)
14. The suspicious diagnosis circuit according to claim 10, further comprising a storage unit that stores the flag.
(Appendix 15)
15. The suspicious diagnosis circuit according to one of appendices 10 to 14, wherein the retry management means increments the number of retries and compares the first threshold value with the second threshold value when the access is denied.
(Appendix 16)
16. The suspicious diagnosis circuit according to claim 10, wherein the retry management unit resets the number of retries when the access is successful.
(Appendix 17)
17. The suspicious diagnosis circuit according to claim 10, wherein the retry management unit resets the retry flag when the access is successful.
(Appendix 18)
18. The suspicious diagnosis circuit according to claim 10, wherein the time has a time when the flag is set.
(Appendix 19)
An information processing apparatus comprising the suspect diagnosis circuit according to any one of appendices 1 to 18.
(Appendix 20)
Based on the success or failure of access to a device connected to the bus, the number of access retries is compared with a first threshold and a second threshold greater than the first threshold;
If the number of retries is greater than or equal to the first threshold, set a flag and time;
Reset the flag after a predetermined time or more from the time,
When the number of retries is equal to or greater than the second threshold value, a suspected diagnosis method that identifies a suspected object based on the success or failure of the access and the flag.
(Appendix 21)
The device according to appendix 20, wherein there are a plurality of devices, a predetermined common portion acts in common on a plurality of the devices, and the common portion is specified as the suspected object when the flags of the plurality of devices are set. Suspicious diagnosis method.
(Appendix 22)
The suspicious diagnosis method according to appendix 21, wherein the common unit has a power source.
(Appendix 23)
23. The suspected diagnosis method according to any one of appendices 20 to 22, wherein when the access is denied, the retry count is incremented and compared with the first threshold value and the second threshold value.
(Appendix 24)
24. The suspicious diagnosis method according to one of appendices 20 to 23, wherein when the access is successful, the retry count is reset.
(Appendix 25)
25. The suspected diagnosis method according to one of appendices 20 to 24, wherein when the access is successful, the retry flag is reset.
(Appendix 26)
26. The suspected diagnosis method according to claim 20, wherein the time includes a time when the flag is set.
(Appendix 27)
A process of comparing the number of retry times of access to a first threshold value and a second threshold value greater than the first threshold value based on success or failure of access to a device connected to the bus;
A process of setting a flag and time when the number of retries is greater than or equal to the first threshold;
A process of resetting the flag when a predetermined time or more has elapsed from the time;
A suspect diagnosis program for causing a computer to execute a process of specifying a suspect object based on success or failure of access and the flag when the number of retries is equal to or greater than the second threshold.
(Appendix 28)
There are a plurality of devices, and a predetermined common part acts in common on a plurality of the devices, and when the flags of a plurality of the devices are set, a process of specifying the common part as the suspect is executed. The suspect diagnosis program according to appendix 27.
(Appendix 29)
29. The suspicious diagnosis program according to appendix 28, wherein the common unit has a power source.
(Appendix 30)
30. The suspicious diagnosis program according to one of appendices 27 to 29, wherein when the access is not permitted, the number of retries is incremented and a process of comparing the first threshold value with the second threshold value is executed.
(Appendix 31)
31. The suspicious diagnosis program according to appendix 27 or 30, wherein when the access is successful, a process of resetting the number of retries is executed.
(Appendix 32)
32. The suspicious diagnosis program according to claim 27, wherein when the access is successful, a process of resetting the retry flag is executed.
(Appendix 33)
33. The suspicious diagnosis program according to claim 27, wherein the time includes a time when the flag is set.

1, 5, 10 Suspicious diagnosis circuit 2 Comparison means 3 Flag management means 4 Suspicious identification means 6 Retry management means 7 Suspicious identification means 20 Retry management means 21 Comparison means 22 Flag management means 23 Time management means 24 Storage means 30 Suspicious identification means 100 Information processing device

Claims (10)

Based on the success or failure of the access to the device connected to the bus, the number of retry times of the access is compared with a first threshold value and a second threshold value that is larger than the first threshold value, and the retry number of times is the second threshold value . A comparison means for instructing the retry of the access when less than a threshold value ;
Flag management means for setting a flag and time if the number of retries is greater than or equal to the first threshold, and resetting the flag when a predetermined time or more has elapsed from the time;
A suspect diagnosis circuit comprising suspect identification means for identifying an suspect object based on the success or failure of the access and the flag when the number of retries is equal to or greater than the second threshold. There are a plurality of the devices,
The predetermined common part acts in common on the plurality of devices,
The suspicious diagnosis circuit according to claim 1, wherein the suspicious identification unit identifies the common part as the suspicious object when the flags of the plurality of devices are set.   The suspect diagnosis circuit according to claim 2, wherein the common unit includes a power source.   4. The suspicious diagnosis circuit according to claim 1, wherein the comparison unit increments the number of retries and compares the first threshold value with the second threshold value when the access is rejected. 5.   5. The suspicious diagnosis circuit according to claim 1, wherein the comparison unit resets the number of retries when the access is successful.   6. The suspicious diagnosis circuit according to claim 1, wherein the flag management means resets the flag when the access is successful. Based on the success or failure of the access to the device connected to the bus, the number of retry times of the access is compared with a first threshold value and a second threshold value that is larger than the first threshold value, and the retry number of times is the second threshold value . Retry management instructing retry of access when less than threshold , setting flag and time when the number of retries is greater than or equal to the first threshold, and resetting the flag when a predetermined time or more has elapsed from the time Means,
A suspect diagnosis circuit comprising suspect identification means for identifying an suspect object based on the success or failure of the access and the flag when the number of retries is equal to or greater than the second threshold.   An information processing apparatus comprising the suspicious diagnosis circuit according to claim 1. Based on the success or failure of access to a device connected to the bus, the number of access retries is compared with a first threshold and a second threshold greater than the first threshold;
If the number of retries is less than the second threshold, indicate the retry of the access,
If the number of retries is greater than or equal to the first threshold, set a flag and time;
Reset the flag after a predetermined time or more from the time,
When the number of retries is equal to or greater than the second threshold value, a suspected diagnosis method that identifies a suspected object based on the success or failure of the access and the flag. A process of comparing the number of retry times of access to a first threshold value and a second threshold value greater than the first threshold value based on success or failure of access to a device connected to the bus;
When the retry count is less than the second threshold, a process for instructing the retry of the access;
A process of setting a flag and time when the number of retries is greater than or equal to the first threshold;
A process of resetting the flag when a predetermined time or more has elapsed from the time;
A suspect diagnosis program for causing a computer to execute a process of specifying a suspect object based on success or failure of access and the flag when the number of retries is equal to or greater than the second threshold.

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