David Kahn

US Patent:

8631181, Jan 14, 2014

Filed:

Sep 26, 2011

Appl. No.:

13/245541

Inventors:

John R. Feehrer - Westford MA, US
Hugh R. Kurth - Woburn MA, US
Carl F. Humphreys - Burlington MA, US
David M. Kahn - Makawao HI, US
John G. Johnson - San Jose CA, US
Tayfun Kocaoglu - Los Gatos CA, US
Gregory C. Onufer - Palo Alto CA, US

Assignee:

Oracle International Corporation - Redwood Shores CA

International Classification:

G06F 13/24

US Classification:

710268, 710260

Abstract:

The disclosed embodiments provide a system that validates message-signaled interrupts. During operation, the system receives a message-signaled interrupt from a requesting device. This message-signaled interrupt includes an interrupt vector that identifies an interrupt, and is accompanied by an identification tag that identifies the source of the interrupt. The system uses the interrupt vector to access a stored tag from a tracking mechanism that associates source devices with their assigned interrupt vector(s). The system then compares the identification tag and the stored tag to validate the message-signaled interrupt.

US Patent:

20180246826, Aug 30, 2018

Filed:

Apr 23, 2018

Appl. No.:

15/960301

Inventors:

- Redwood Shores CA, US
Patrick Stabile - Everett MA, US
Hugh R. Kurth - Bedford MA, US
David M. Kahn - Makawao HI, US

International Classification:

G06F 13/24
G06F 13/16
G06F 13/40

Abstract:

Embodiments of input/output hub unit are disclosed for aggregating interrupts received from multiple endpoint devices. The input/output hub may include an interface unit and one or more communication units. Each communication unit may be configured to receive messages from a corresponding endpoint device. The interface unit may be configured to update a first pointer within a first data structure responsive to a request from a given one of the communication units. The interface unit may be further configured to stored data in a second data structure responsive to updating the first pointer, reading a second pointer and the first pointer, and sending an interrupt responsive to a determination that the first and second pointers are equal.

US Patent:

20170286354, Oct 5, 2017

Filed:

Jun 21, 2017

Appl. No.:

15/629293

Inventors:

- Redwood City CA, US
Matthew Cohen - Cambridge MA, US
Rahoul Puri - Los Altos CA, US
Tayfun Kocaoglu - Los Gatos CA, US
John Johnson - San Jose CA, US
David Kahn - Makawao HI, US
Alan Adamson - San Diego CA, US
Sriram Jayakumar - Lexington MA, US
Julia Harper - Arlington MA, US
Robert G. Sheldon - Duxbury MA, US
Mark Kanda - Austin TX, US

International Classification:

G06F 13/42
G06F 9/455
G06F 13/36

Abstract:

An apparatus and method for controlling a device with shared hardware resources to provide separate execution environments for control and data functions are disclosed. A processor may be configured to generate a first request to access control functions of the device in response to execution of a first thread, and generate a second request to access data functions of the device in response to execution of a second thread. A communication unit may send first indicative of the first request and second data indicative of the second request to the device via first and second ports, respectively.

US Patent:

20170017589, Jan 19, 2017

Filed:

Sep 27, 2016

Appl. No.:

15/277146

Inventors:

- Redwood City CA, US
Patrick Stabile - Everett MA, US
Hugh R. Kurth - Bedford MA, US
David M. Kahn - Makawao HI, US

International Classification:

G06F 13/24
G06F 13/40
G06F 13/16

Abstract:

Embodiments of input/output hub unit are disclosed for aggregating interrupts received from multiple endpoint devices. The input/output hub may include an interface unit and one or more communication units. Each communication unit may be configured to receive messages from a corresponding endpoint device. The interface unit may be configured to update a first pointer within a first data structure responsive to a request from a given one of the communication units. The interface unit may be further configured to stored data in a second data structure responsive to updating the first pointer, reading a second pointer and the first pointer, and sending an interrupt responsive to a determination that the first and second pointers are equal.

US Patent:

20150356036, Dec 10, 2015

Filed:

Jun 10, 2014

Appl. No.:

14/300388

Inventors:

- Redwood City CA, US
Patrick Stabile - Everett MA, US
Hugh R Kurth - Bedford MA, US
David M Kahn - Makawao HI, US

International Classification:

G06F 13/24
G06F 13/16

Abstract:

Embodiments of input/output hub unit are disclosed for aggregating interrupts received from multiple endpoint devices. The input/output hub may include an interface unit and one or more communication units. Each communication unit may be configured to receive messages from a corresponding endpoint device. The interface unit may be configured to update a first pointer within a first data structure responsive to a request from a given one of the communication units. The interface unit may be further configured to stored data in a second data structure responsive to updating the first pointer, reading a second pointer and the first pointer, and sending an interrupt responsive to a determination that the first and second pointers are equal.

US Patent:

20150356038, Dec 10, 2015

Filed:

Jun 10, 2014

Appl. No.:

14/300418

Inventors:

- Redwood City CA, US
Patrick Stabile - Everett MA, US
Hugh R Kurth - Bedford MA, US
David M Kahn - Makawao HI, US
Robert Dickson - Harvard MA, US

International Classification:

G06F 13/32

Abstract:

Embodiments of input/output hub unit are disclosed for virutalizing an input/output subsystem. The input/output hub may include an interface unit and one or more communication units. Each communication unit may be configured to receive interrups or messages from a corresponding endpoint device. A given communication unit may be further configured to synthesize a virtual address from the received message, translate the synthesized virtual address to a real address, and then translate the real address to a physical address. The interface unit may be configured to send an interrupt dependent upon the physical address.