Abstract: A memory subsystem includes memory devices with space dynamically allocated for improvement of reliability, availability, and serviceability (RAS) in the system. Error checking and correction (ECC) logic detects an error in all or a portion of a memory device. In response to error detection, the system can dynamically perform one or more of: allocate active memory device space for sparing to spare a failed memory segment; write a poison pattern into a failed cacheline to mark it as failed; perform permanent fault detection (PFD) and adjust application of ECC based on PFD detection; or, spare only a portion of a device and leave another portion active, including adjusting ECC based on the spared portion. The error detection can be based on bits of an ECC device, and error correction based on those bits and additional bits stored on the data devices.

Abstract: A memory subsystem with error checking and scrubbing (ECS) logic on-device on the memory can adapt the rate of ECS operations in response to detection of errors in the memory when the memory device is in automatic ECS mode. The ECS logic can include an indication of rows of memory that have been offlined by the host. The ECS logic can skip the offlined rows in ECS operation counts. The ECS logic can include requests or hints by the host to have ECS operations performed. An internal address generator of the ECS logic can select between generated addresses and the hints. The system can allow a memory controller to detect multibit errors (MBEs) related to a specific address of the associated memory. When the detected MBEs indicate a pattern of errors, the memory controller triggers a row hammer response for the specific address.

Abstract: A memory subsystem includes memory devices with space dynamically allocated for improvement of reliability, availability, and serviceability (RAS) in the system. Error checking and correction (ECC) logic detects an error in all or a portion of a memory device. In response to error detection, the system can dynamically perform one or more of: allocate active memory device space for sparing to spare a failed memory segment; write a poison pattern into a failed cacheline to mark it as failed; perform permanent fault detection (PFD) and adjust application of ECC based on PFD detection; or, spare only a portion of a device and leave another portion active, including adjusting ECC based on the spared portion. The error detection can be based on bits of an ECC device, and error correction based on those bits and additional bits stored on the data devices.

Abstract: Upon occurrence of multiple errors in a central processing unit (CPU) package, data indicating the errors is stored in machine check (MC) banks. A timestamp corresponding to each error is stored, the timestamp indicating a time of occurrence for each error. A machine check exception (MCE) handler is generated to address the errors based on the timestamps. The timestamps can be stored in the MC banks or in a utility box (U-box). The MCE handler can then address the errors based on order of occurrence, for example by determining that the first error in time causes the remaining error. The MCE can isolate hardware/software associated with the first error to recover from a failure. The MCE can report only the first error to the operating system (OS) or other error management software/hardware. The U-Box may also convert the timestamps into real time to support user debugging.

Abstract: An apparatus is described. The apparatus includes a processor. The processor includes a memory controller to read and write from a memory. The memory controller includes error correction coding (ECC) circuitry to correct errors in data read from the memory. The processor includes register space to track read data error information. The processor includes an embedded controller. The processor includes local memory coupled to the embedded controller. The embedded controller is to read the read data error information and store the read data error information in the local memory.

Abstract: Upon occurrence of multiple errors in a central processing unit (CPU) package, data indicating the errors is stored in machine check (MC) banks. A timestamp corresponding to each error is stored, the timestamp indicating a time of occurrence for each error. A machine check exception (MCE) handler is generated to address the errors based on the timestamps. The timestamps can be stored in the MC banks or in a utility box (U-box). The MCE handler can then address the errors based on order of occurrence, for example by determining that the first error in time causes the remaining error. The MCE can isolate hardware/software associated with the first error to recover from a failure. The MCE can report only the first error to the operating system (OS) or other error management software/hardware. The U-Box may also convert the timestamps into real time to support user debugging.

Abstract: Upon occurrence of multiple errors in a central processing unit (CPU) package, data indicating the errors is stored in machine check (MC) banks. A timestamp corresponding to each error is stored, the timestamp indicating a time of occurrence for each error. A machine check exception (MCE) handler is generated to address the errors based on the timestamps. The timestamps can be stored in the MC banks or in a utility box (U-box). The MCE handler can then address the errors based on order of occurrence, for example by determining that the first error in time causes the remaining error. The MCE can isolate hardware/software associated with the first error to recover from a failure. The MCE can report only the first error to the operating system (OS) or other error management software/hardware. The U-Box may also convert the timestamps into real time to support user debugging.

Abstract: An apparatus and method for machine check bank reporting in a processor. For example, one embodiment includes a processor comprising: one or more cores to execute instructions and process data; a plurality of machine check architecture banks to store errors detected during execution of the instructions; error monitoring circuitry to detect the errors and responsively update the MCA banks; and a first error register (FERR) into which a first error vector is to be stored to identify an MCA bank containing a first error in an error sequence, the error monitoring circuitry to update the first error vector responsive to detecting the first error; and one or more next error registers (NERRs) to store one or more error vectors to one or more other MCA banks containing subsequent errors occurring after the first error.

Abstract: Upon occurrence of multiple errors in a central processing unit (CPU) package, data indicating the errors is stored in machine check (MC) banks. A timestamp corresponding to each error is stored, the timestamp indicating a time of occurrence for each error. A machine check exception (MCE) handler is generated to address the errors based on the timestamps. The timestamps can be stored in the MC banks or in a utility box (U-box). The MCE handler can then address the errors based on order of occurrence, for example by determining that the first error in time causes the remaining error. The MCE can isolate hardware/software associated with the first error to recover from a failure. The MCE can report only the first error to the operating system (OS) or other error management software/hardware. The U-Box may also convert the timestamps into real time to support user debugging.

Abstract: Upon occurrence of multiple errors in a central processing unit (CPU) package, data indicating the errors is stored in machine check (MC) banks. A timestamp corresponding to each error is stored, the timestamp indicating a time of occurrence for each error. A machine check exception (MCE) handler is generated to address the errors based on the timestamps. The timestamps can be stored in the MC banks or in a utility box (U-box). The MCE handler can then address the errors based on order of occurrence, for example by determining that the first error in time causes the remaining error. The MCE can isolate hardware/software associated with the first error to recover from a failure. The MCE can report only the first error to the operating system (OS) or other error management software/hardware. The U-Box may also convert the timestamps into real time to support user debugging.

Abstract: In one embodiment, a processor includes a plurality of cores including a first core to be reserved for execution in a protected domain, the first core to be hidden from an operating system. The processor may further include a filter coupled to the plurality of cores, where the filter includes a plurality of fields each associated with one of the plurality of cores to indicate whether an interrupt of the protected domain is to be directed to the corresponding core. Other embodiments are described and claimed.

Abstract: An apparatus and method for machine check bank reporting in a processor. For example, one embodiment includes a processor comprising: one or more cores to execute instructions and process data; a plurality of machine check architecture banks to store errors detected during execution of the instructions; error monitoring circuitry to detect the errors and responsively update the MCA banks; and a first error register (FERR) into which a first error vector is to be stored to identify an MCA bank containing a first error in an error sequence, the error monitoring circuitry to update the first error vector responsive to detecting the first error; and one or more next error registers (NERRs) to store one or more error vectors to one or more other MCA banks containing subsequent errors occurring after the first error.

Abstract: Upon occurrence of multiple errors in a central processing unit (CPU) package, data indicating the errors is stored in machine check (MC) banks. A timestamp corresponding to each error is stored, the timestamp indicating a time of occurrence for each error. A machine check exception (MCE) handler is generated to address the errors based on the timestamps. The timestamps can be stored in the MC banks or in a utility box (U-box). The MCE handler can then address the errors based on order of occurrence, for example by determining that the first error in time causes the remaining error. The MCE can isolate hardware/software associated with the first error to recover from a failure. The MCE can report only the first error to the operating system (OS) or other error management software/hardware. The U-Box may also convert the timestamps into real time to support user debugging.

Abstract: Methods and apparatuses relating to a common architectural state presentation for a processor having cores of different types are described. In one embodiment, a processor includes a first core, a second core, wherein the first core comprises a unique architectural state and a common architectural state with the second core, and circuitry to migrate a thread from said first core to said second core, said circuitry to migrate the common architectural state from the first core to the second core, and migrate the unique architectural state to a storage external from the second core.

Abstract: In one embodiment, the present invention includes a method for controlling redundant execution such that if an exceptional event occurs, the redundant execution is stopped, non-redundant execution is performed in one of the threads until the exceptional event has been-resolved, after which a state of the threads is synchronized, and redundant execution is continued. Other embodiments are described and claimed.

Abstract: In one embodiment, a processor includes a plurality of cores including a first core to be reserved for execution in a protected domain, the first core to be hidden from an operating system. The processor may further include a filter coupled to the plurality of cores, where the filter includes a plurality of fields each associated with one of the plurality of cores to indicate whether an interrupt of the protected domain is to be directed to the corresponding core. Other embodiments are described and claimed.

Abstract: Methods and apparatuses relating to a common architectural state presentation for a processor having cores of different types are described.

Abstract: Embodiments of an invention for signaling software recoverable errors are disclosed. In one embodiment, a processor includes a first unit, a programmable indicator, and a second unit. The first unit is to detect a poison error. The programmable indicator is to indicate whether the poison error is signaled as a machine check error or as one of a fault and a system management interrupt. The second unit is to signal the poison error as one of a fault and a system management error responsive to the programmable indicator.

Abstract: In one embodiment, the present invention includes a method for providing a cache block in an exclusive state to a first cache and providing the same cache block in the exclusive state to a second cache when cores accessing the two caches are executing redundant threads. Other embodiments are described and claimed.

Abstract: A redundant multithreading processor is presented. In one embodiment, the processor performs execution of a thread and its duplicate thread in parallel and determines, when in a redundant multithreading mode, whether or not to synchronize an operation of the thread and an operation of the duplicate thread.