INFORMATION PROCESSING APPARATUS AND CONTROL METHOD THEREOF

• US 20090216930A1
• Filed: 02/13/2009
• Published: 08/27/2009
• Est. Priority Date: 02/27/2008
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: NISHINO, Shuji
• Granted Patent: US 8,151,028 B2
• Time in Patent Office: Days
• US Class Current: 710/267
• CPC Class Codes: G06F 13/26 with priority control

Abstract

An information processing apparatus connected with an IO device, having a processing unit, a channel device transferring data between the information processing apparatus and the IO device having a activation controller activating the channel device, a storage device having a predetermined area storing a result operation executed by the channel device, an interrupt controller controlling an interrupt required by the channel device to the processing unit, a channel device controller controlling the channel device and a driver writing a request for a first interrupt in the area of the storage device through the channel device and requiring the first interrupt to the processing unit by using the interrupt controller, wherein the processing unit executes driver commands for reading information stored in the area and requesting the first interrupt when the processing unit detects the request for the first interrupt.

Claims

1. An information processing apparatus connected with an IO device, comprising:

a processing unit;

a channel device transferring data between the information processing apparatus and the IO device, the channel device having a activation controller activating the channel device;

a storage device having a predetermined area storing a result operation executed by the channel device;

an interrupt controller controlling an interrupt required by the channel device to the processing unit;

a channel device controller controlling the channel device; and

a driver writing a request for a first interrupt in the predetermined area of the storage device through the channel device and requiring the first interrupt to the processing unit by using the interrupt controller,

wherein the processing unit executes driver commands for reading information stored in the predetermined area and requesting the first interrupt when the processing unit detects the request for the first interrupt.

2. The information processing apparatus according to claim 1, wherein the channel device executes the driver commands requests for the first interrupt, writes a result of the first interrupt in the predetermined area and requires a second interrupt to the processing unit by using the interrupt controller;

and

wherein the processing unit reads the result of the first interrupt from the predetermined area when the processing unit detects the request for the second interrupt and notifies a completion of the second interrupt to the interrupt controller.

3. The information processing apparatus according to claim 1, wherein the processing unit executes the driver commands to cancel the first interrupt when the request for the first interrupt required by the channel device is not accepted.

4. The information processing system according to claim 3, wherein the driver reports an error to the channel device controller when the first interrupt required by the channel device is not accepted.

5. An information processing system comprising:

an information processing apparatus having a processing unit;

an IO device connected to the information processing apparatus;

a channel device transferring data between the information processing apparatus and the IO device, the channel device having a activation controller activating the channel device;

a storage device having a predetermined area storing a result operation executed by the channel device;

an interrupt controller controlling an interrupt required by the channel device to the processing unit;

a channel device controller controlling the channel device; and

a driver writing a request for a first interrupt in the predetermined area of the storage device through the channel device and requiring the first interrupt to the processing unit by using the interrupt controller,

wherein the processing unit executes driver commands for reading information stored in the predetermined area and requesting the first interrupt when the processing unit detects the request for the first interrupt.

6. The information processing apparatus according to claim 5,

wherein the channel device executes the driver commands requests for the first interrupt, writes a result of the first interrupt in the predetermined area and requires a second interrupt to the processing unit by using the interrupt controller;

and

wherein the processing unit reads the result of the first interrupt from the predetermined area when the processing unit detects the request for the second interrupt and notifies a completion of the second interrupt to the interrupt controller.

7. The information processing apparatus according to claim 5, wherein the processing unit executes the driver commands to cancel the first interrupt when the request for the first interrupt required by the channel device is not accepted.

8. The information processing system according to claim 7, wherein the driver reports an error to the channel device controller when the first interrupt required by the channel device is not accepted.

9. A control method of an information processing apparatus connected with an IO device, having a processing unit, a storage device, a channel device including an interrupt controller transferring data between the information processing apparatus and the IO device, the method comprising:

writing a request for a first interrupt in a predetermined area of the storage device by the channel device;

requiring the first interrupt to the processing unit by using the interrupt controller;

reading the request for the first interrupt from the predetermined area by the processing unit when the processing unit detects the request for the first interrupt; and

executing the first interrupt by using the interrupt controller when the first interrupt required by the channel device is accepted when other processes to be prioritized over the request for the first interrupt by the processing unit do not exist, and executing the first interrupt by using the interrupt controller after the processing unit executes other processes when the request for the first interrupt is not accepted because the other processes to be prioritized over the request for the first interrupt exist.

10. The control method according to claim 9, further comprising:

executing the request for the first interrupt by the channel device;

writing the result of the first interrupt in the predetermined area by the channel device;

requiring a second interrupt to the processing unit by the channel device by using the interrupt controller;

reading the result of the first interrupt from the predetermined area when the processing unit detects the second interrupt; and

notifying the completion of the second interrupt to the interrupt controller by the processing unit.

11. The control method according to claim 10, further comprising:

cancelling the first interrupt required by the channel device when the processing unit does not accept the first interrupt.

12. The control method according to claim 11, further comprising:

reporting an error to the channel device controller when the processing unit does not accept the first interrupt required by the channel driver.

13. A control program product for an information processing apparatus connected with an IO device, having a processing unit, a storage device, a channel device including an interrupt controller transferring data between the information processing apparatus and the IO device, said control program for an information processing apparatus for executing the processes of:

writing a request for a first interrupt in an predetermined area of the storage device by using the channel device;

requiring the first interrupt to the processing unit by using the interrupt controller included in the channel device;

reading the request for the first interrupt from the predetermined area when the processing unit detects the request for the first interrupt; and

executing the first interrupt by using the interrupt controller when the first interrupt required by the channel device is accepted when other processes to be prioritized over the request for the first interrupt do not exist, and executing the first interrupt by using the interrupt controller after the processing unit executes other processes when the request for the first interrupt required by the channel device is not accepted because the other processes to be prioritized over the request for the first interrupt exist.

14. The control program according to claim 13, further executing the processes of:

executing the request for the first interrupt by using the channel device;

writing the result of the first interrupt in the predetermined area by using the channel device;

requiring a second interrupt to the processing unit by using the interrupt controller included in the channel device;

reading the result of the first interrupt from the predetermined area when the processing unit detects the request for the second interrupt; and

notifying the completion of the second interrupt to the interrupt controller.

15. The control program according to claim 14, further executing the processes of:

cancelling the first interrupt required by the channel device when the first interrupt is not accepted.

16. The control program according to claim 15, further executing the processes of:

reporting the error when the first interrupt required by the channel device is not accepted.