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Method for user space operations for direct I/O between an application instance and an I/O adapter

  • US 7,552,240 B2
  • Filed: 05/23/2005
  • Issued: 06/23/2009
  • Est. Priority Date: 05/23/2005
  • Status: Active Grant
First Claim
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1. A method, in a data processing system, for managing user space operations, comprising:

  • receiving, in the data processing system, a user space operation from a user management interface;

    determining if the user space operation is a resource management operation or a processing queue operation;

    performing one or more resource management operations to either create, modify, query or destroy a resource allocation if the user space operation is a resource management operation; and

    performing one or more processing queue operations to insert a work queue entry in a work queue to send an out of user space input/output (I/O) operation directly to an I/O adapter without intervention by either an operating system or system image, and to retrieve, directly from the I/O adapter without intervention by either an operating system or system image, a completion queue entry from a completion queue for a completed out of user space input/output operation, if the user space operation is a processing queue operation.

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