Patents by Inventor Nicholas STILWELL

Nicholas STILWELL has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Emulating memory mapped I/O for coherent accelerators in error state
    Patent number: 9690495
    Abstract: Embodiments disclose techniques for emulating memory mapped I/O (MMIO) for coherent accelerators in an error state. In one embodiment, once an operating system determines that a processor is unable to access a coherent accelerator via a MMIO operation, the operating system deletes one or more page table entries associated with MMIO of one or more hardware contexts of the coherent accelerator. After deleting the page table entries, the operating system can detect a page fault associated with execution of a process by the processor. Upon determining that the page fault was caused by the process attempting to access one of the deleted page table entries while executing a MMIO operation, the operating system emulates the execution of the MMIO operation for the faulting process, giving the process the illusion that its requested MMIO operation was successful.
    Type: Grant
    Filed: November 3, 2015
    Date of Patent: June 27, 2017
    Assignee: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Andre L. Albot, Vishal C. Aslot, Bruce Mealey, Nicholas Stilwell
  • EMULATING MEMORY MAPPED I/O FOR COHERENT ACCELERATORS IN ERROR STATE
    Publication number: 20170123684
    Abstract: Embodiments disclose techniques for emulating memory mapped I/O (MMIO) for coherent accelerators in an error state. In one embodiment, once an operating system determines that a processor is unable to access a coherent accelerator via a MMIO operation, the operating system deletes one or more page table entries associated with MMIO of one or more hardware contexts of the coherent accelerator. After deleting the page table entries, the operating system can detect a page fault associated with execution of a process by the processor. Upon determining that the page fault was caused by the process attempting to access one of the deleted page table entries while executing a MMIO operation, the operating system emulates the execution of the MMIO operation for the faulting process, giving the process the illusion that its requested MMIO operation was successful.
    Type: Application
    Filed: November 3, 2015
    Publication date: May 4, 2017
    Inventors: Andre L. ALBOT, Vishal C. ASLOT, Bruce MEALEY, Nicholas STILWELL