Method and apparatus for enabling data paths on a remote bus

• US 5,655,112 A
• Filed: 09/09/1994
• Issued: 08/05/1997
• Est. Priority Date: 10/23/1992
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: MacInnis, Alexander Garland
• Primary Examiner(s): Heckler, Thomas M.
• Assistant Examiner(s): BUTLER, DENNIS
• Application Number:
  US08/303,553
• Time in Patent Office: 1,061 Days
• Field of Search: 395/501, 395/502, 395/504, 395/505, 395/672, 395/676, 395/290, 395/293, 395/308, 395/311, 395/312
• US Class Current: 345/501
• CPC Class Codes: G06F 13/362 with centralised access control
• CPC Class Codes: G06F 15/17 using an input/output type connection, e.g. channel, I/O port
• CPC Class Codes: G06F 9/5011 the resources being hardware resources other than CPUs, Servers and Terminals

Abstract

A method for enabling data paths including the steps of receiving a request to enable a data path on a remote bus between a first processing apparatus and a second processing apparatus, determining whether the remote bus can handle the requested data path, and enabling the data path on the remote bus if the remote bus can handle the requested data path. In addition, an apparatus for enabling data paths including an apparatus for receiving a request to enable a data path on a remote bus between a first processing apparatus and a second processing apparatus, apparatus for determining whether the remote bus can handle the requested data path, and apparatus for enabling the data path on the remote bus if the remote bus can handle the requested data path.

Claims

1. A method for a bus enabler to enable data paths on a data processing system including a processor coupled to the bus enabler by a first bus, and a first processing means coupled to a second processing means by a remote bus, comprising the steps of:

a) receiving a request from the processor across the first bus to enable a data path on the remote bus between the first processing means and the second processing means, said remote bus not being directly connected to said processor, said first and second processing means being directly connected to the remote bus, and said data path not including the first bus;

b) determining whether the remote bus can handle the requested data path; and

c) enabling the data path on the remote bus if the remote bus can handle the requested data path.

2. The method of claim 1 wherein the step of enabling includes sending a request to at least one of the processing means to enable the requested data path.

3. The method of claim 2 further comprising step of enabling multiple data paths on the remote bus.

4. The method of claim 3 wherein the step of enabling multiple data paths includes enabling the multiple data paths to concurrently contend for use of the remote bus.

5. The method of claim 4 wherein the step of enabling multiple data paths includes prioritizing each enabled data path.

6. The method of claim 1 wherein the step of receiving includes said remote bus not being directly connected to said first bus.

7. The method of claim 1 wherein the step of receiving includes said remote bus not being accessible by said processor except through said enabling means.

8. An apparatus for enabling data paths on a data processing system including a processor coupled to a bus enabler by a first bus, and a first processing means coupled to a second processing means by a remote bus, comprising:

a) means for receiving a request from the processor across the first bus to enable a data path on the remote bus between the first processing means and the second processing means, said remote bus not being directly connected to said processor, said first and second processing means being directly connected to the remote bus, and said data path not including the first bus;

b) means for determining whether the remote bus can handle the requested data path; and

c) means for enabling the data path on the remote bus if the remote bus can handle the requested data path.

9. The apparatus of claim 8 wherein the means for enabling includes means for sending a request to at least one of the processing means to enable the requested data path.

10. The apparatus of claim 9 further comprising means for enabling multiple data paths on the remote bus.

11. The apparatus of claim 10 wherein the means for enabling multiple data paths includes means for enabling the multiple data paths to concurrently contend for use of the remote bus.

12. The apparatus of claim 11 wherein the means for enabling multiple data paths includes means for prioritizing each enabled data path.

13. The apparatus of claim 8 wherein the means for receiving includes said remote bus not being directly connected to said first bus.

14. The apparatus of claim 8 wherein the means for receiving includes said remote bus not being accessible by said processor except through said enabling means.

15. A data processing system for enabling data paths comprising:

a) a processor for processing data;

b) a memory for storing data to be processed;

c) a first processing means on a remote bus;

d) a second processing means on the remote bus;

e) means for receiving a request from said processor across a first bus to enable a data path on the remote bus between the first processing means and the second processing means, said remote bus not being directly connected to said processor, said first and second processing means being directly connected to the remote bus, and said data path not including the first bus;

f) means for determining whether the remote bus can handle the requested data path from data stored in the memory; and

g) means for enabling the data path on the remote bus if the remote bus can handle the requested data path.

16. The data processing system of claim 15 wherein the means for enabling includes means for sending a request to at least one of the processing means to enable the requested data path.

17. The data processing system of claim 16 further comprising means for enabling multiple data paths on the remote bus.

18. The data processing system of claim 17 wherein the means for enabling multiple data paths includes means for enabling the multiple data paths to concurrently contend for use of the remote bus.

19. The data processing system of claim 18 wherein the means for enabling multiple data paths includes means for prioritizing each enabled data path.

20. The data processing system of claim 15 wherein the means for receiving includes said remote bus not being directly connected to said first bus.

21. The data processing system of claim 15 wherein the means for receiving includes said remote bus not being accessible by said processor except through said enabling means.

22. A memory for storing a computer program executable by a processor for instructing a data processing system to enable data paths comprising:

a) means for receiving a request from the processor across a first bus to enable a data path on a remote bus between a first processing means and a second processing means, said remote bus not being directly connected to said processor, said first and second processing means being directly connected to the remote bus, and said data path not including the first bus;

b) means for determining whether the remote bus can handle the requested data path; and

c) means for enabling the data path on the remote bus if the remote bus can handle the requested data path.

23. The memory of claim 22 wherein the means for enabling includes means for sending a request to at least one of the processing means to enable the requested data path.

24. The memory of claim 23 further comprising means for enabling multiple data paths on the remote bus.

25. The memory of claim 24 wherein the means for enabling multiple data paths includes means for enabling the multiple data paths to concurrently contend for use of the remote bus.

26. The memory of claim 25 wherein the means for enabling multiple data paths includes means for prioritizing each enabled data path.

27. The memory of claim 22 wherein the means for receiving includes said remote bus not being directly connected to said first bus.

28. The memory of claim 22 wherein the means for receiving includes said remote bus not being accessible by said processor except through said enabling means.