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

• US 9,201,830 B2
• Filed: 11/13/2012
• Issued: 12/01/2015
• 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:
  US13/674,987
• Publication Number:
  US 20130073767A1
• Time in Patent Office: 1,113 Days
• US Class Current: 1/1
• 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

A system for implementing non-standard input/output (I/O) adapters in a standardized I/O architecture, 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 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 method further comprising 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, transforming the request into the format supported by the I/O bus, transmitting the request to the I/O adapter, receiving the completion response from the I/O adapter, 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.

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 adapter communicatively coupled to an I/O hub via an I/O bus, I/O adapter including logic for implementing a method, the method comprising;

receiving a request for an operation, the request indicating that a completion response to the request is required, the completion response comprising an address of the I/O adapter and a response code;

determining that the operation does not generate the completion response;

generating a new request, the new request in a format supported by the I/O bus;

transforming the header of the new request to include the address of the I/O adapter; and

sending the new request to a host system via the I/O bus,

wherein the completion response is in a format not supported by the I/O bus and the new request is in a format not supported by the I/O adapter and a requester, the requester initiating the request.

2. The system of claim 1, wherein the I/O bus is a PCIe bus.

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

4. The system of claim 1, wherein the I/O adapter comprises an I/O expansion adapter, the I/O expansion adapter sharing the I/O bus with at least one PCIe adapter.

5. The system of claim 1, wherein the new request is generated in response to determining that the request is a write request.