Processing input/output operations in a channel using a control block

US10223013B2 · kind B2 · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Craig A. Bickelman · Poughkeepsie, US
• Daniel F. Casper · Poughkeepsie, US
• Christopher J. Colonna · Ossining, US
• John R. Flanagan · Poughkeepsie, US
• Francis Gassert · Monroe, US
• Elke G. Nass · Ehningen, DE
• Kenneth J. Oakes · Wappingers Falls, US
• Mooheng Zee · Fishkill, US

Key dates

• Filing date: Apr 11, 2017
• Grant date: Mar 5, 2019
• Expiry date: Apr 11, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F13/1642
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

Examples of techniques for processing I/O operations in a channel are disclosed. In one example implementation according to aspects of the present disclosure, a computer-implemented method may include: copying, by a system assist processor, a subchannel of the channel into a lower portion of a channel communication area responsive to receiving the I/O operation; copying, by the system assist processor, channel program information from a designated starting location in a customer memory into a control block; building, by the system assist processor, a starting channel communication area into a top portion of the control block; queuing, by the system assist processor, the control block to a queue for the channel; processing, by the channel, the I/O operation responsive to retrieving the control block from the queue.