MCA Error Logging Buffer for Preserving Machine Check Exceptions
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Solution Overview
Problem
Existing Machine Check Architecture (MCA) systems fail to effectively store and manage multiple hardware errors in quick succession, leading to potential loss of critical error details due to overwriting in register banks, which hampers debugging and error handling.
Innovation Solution
Implementing a Machine Check Architecture (MCA) subsystem that copies error exception details to system memory using circuitry, such as scatter-gather circular linked lists or contiguous arrays, and utilizes DMA engines to prevent overwriting, allowing error handling software to access and analyze errors without real-time retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If error handling software rapidly reads and caches errors from register banks in real time, then error processing speed is improved, but earlier errors may be overwritten or lost
Solution Approach 1:
The patent implements a circular buffer data structure in system memory that pre-allocates storage space for multiple error records. When errors occur, they are automatically stored in this pre-prepared buffer structure, eliminating the need for real-time retrieval and caching operations. The circular buffer continuously overwrites oldest entries only when full, preserving recent errors while maintaining a history of previous errors.
Solution Approach 2:
The patent introduces a circular buffer data structure as an intermediary between the register banks and error handling software. This buffer acts as a buffer zone that temporarily holds multiple error records, allowing software to access errors at its own pace without risking overwriting. The buffer mediates the conflict between fast error reporting and careful error analysis.
2Ease of operation
If errors are stored in register banks for real-time processing, then error handling responsiveness is improved, but multiple sequential errors cannot be retained
Solution Approach 1:
The patent transitions from storing errors in fixed register banks (one-dimensional, single-slot storage) to using a circular buffer data structure in system memory (multi-dimensional, multi-slot storage). This dimensional change allows the system to retain multiple error records simultaneously while maintaining efficient access patterns. The circular buffer organizes error storage in a wraparound structure that efficiently utilizes memory space.
3Reliability
If error details are logged to system memory using DMA engines, then error data preservation is improved, but system complexity increases
Solution Approach 1:
The patent implements a self-service error logging mechanism where the circular buffer in system memory automatically receives error records via DMA engines without requiring active intervention from error handling software. The buffer structure itself manages the storage and preservation of error data, freeing the software from the burden of real-time error capture and preservation while ensuring reliable data retention.
Data Source
AI summary
Examples described herein relate to circuitry to copy reported error data to a data structure in memory. In some examples, the reported error data includes a last reported error and at least one other reported error. In some examples, the circuitry utilizes a direct memory access (DMA) circuitry to copy the reported error data to the data structure in memory.