Input/output (I/O) expansion response processing in a peripheral component interconnect express (PCIe) environment

• US 8,918,573 B2
• Filed: 06/23/2010
• Issued: 12/23/2014
• Est. Priority Date: 06/23/2010
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Gregg, Thomas A., Craddock, David F., Lais, Eric N.
• Primary Examiner(s): Patel, Nimesh G
• Application Number:
  US12/821,239
• Publication Number:
  US 20110320666A1
• Time in Patent Office: 1,644 Days
• Field of Search: 710313-315
• US Class Current: 710/313
• CPC Class Codes: G06F 13/36 for access to common bus or bus system
• CPC Class Codes: G06F 13/385 for adaptation of a particular data processing system to different peripheral devices
• CPC Class Codes: G06F 13/4027 using bus bridges G06F13/4022 takes precedence

Abstract

Embodiments of the invention relate to optimizing EDRAM refresh rates in a high performance cache architecture. A request is received from a requester to perform an operation on an I/O adapters. It is determined if the request is in a format other than a format supported by an I/O bus and if, the requester requires a completion response for the request. The request is transformed into the format supported by the I/O bus and is transmitted to the I/O adapter. The completion response is received from the I/O adapter, and includes an indicator that the request has been completed. The completion response is in the format supported by the I/O bus and is transmitted to the requester.

Claims

1. A system for implementing non-standard input/output (I/O) adapters in a standardized I/O architecture, the system comprising:

an I/O hub communicatively coupled to an I/O bus and a plurality of I/O adapters, the I/O hub including logic configured for implementing a method comprising;

receiving a request from a requester to perform an operation on one of the plurality of I/O adapters, the request including an address field for storing a requestor address;

determining that the request is in a format other than a format supported by the I/O bus;

determining that the requester requires a completion response for the request, the determining based on a content of at least one bit in the address field;

transforming the request into the format supported by the I/O bus;

transmitting the transformed request to the I/O bus;

receiving the completion response from an I/O adapter included in the plurality of I/O adapters, the completion response comprising an indicator that the request has been completed, the completion response in the format supported by the I/O bus; and

transmitting the completion response to the requester.

2. The system of claim 1, wherein the I/O bus is a Peripheral Component Interconnect Express (PCIe) bus.

3. The system of claim 1, wherein the format of the request is an I/O expansion format.

4. The system of claim 1, wherein the plurality of I/O adapters comprises at least one I/O expansion adapter and at least one PCIe adapter.

5. The system of claim 1, wherein the transformed request is in a format not supported by the I/O adapter and the requester.

6. The system of claim 1, wherein the method further comprises:

determining that the request is a request to store data; and

storing information about the requester in the I/O hub in response to the determining, the information comprising;

the requester address;

the operation code, the operation code identifying the operation that is to be performed; and

an indicator indicating that a response is required.

7. The system of claim 1, wherein the determining that the request is in a format other than a format supported by the I/O bus is based on the content of at least one bit in the address field.

8. A system for implementing non-standard input/output (I/O) adapters in a standardized I/O architecture, the system comprising:

an I/O hub communicatively coupled to an I/O bus and a plurality of I/O adapters, the I/O hub including logic configured for implementing a method comprising;

receiving a request from a requester to perform an operation on one of the plurality of I/O adapters, the request including an address field for storing the requestor address;

determining that the requester requires a completion response for the request, the determining based on a content of at least one bit in the address field;

determining that the request is a request to store data;

storing information about the requester in the I/O hub in response to the determining, the information comprising;

the requester address;

an operation code, the operation code identifying the operation that is to be performed; and

an indicator indicating that a response is required;

determining that the request is in a format other than a format supported by the I/O bus;

transforming the request into the format supported by the I/O bus;

transmitting the transformed request to the I/O bus;

receiving the completion response from an I/O adapter included in the plurality of I/O adapters, the completion response comprising an indicator that the request has been completed, the completion response in the format supported by the I/O bus; and

transmitting the completion response to the requester.