PCIe Retimer Fault Handling Through Error Event Notification
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Solution Overview
Problem
Existing interconnect architectures in computing systems lack standardized mechanisms for error detection and fault handling in extension devices such as retimers, leading to unreliable operation and hindered adoption of high-speed interconnect protocols due to undetectable errors and increased latency.
Innovation Solution
Equipping retimers with error detection logic and event registers to detect and report errors, allowing system software to handle fault handling and improve Reliability, Availability, and Serviceability (RAS) by enabling in-band and out-of-band notifications to endpoint devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If extension devices like retimers are added to extend link length, then the physical reach of the interconnect is improved, but error detection and fault handling capabilities deteriorate due to lack of standardized mechanisms
Solution Approach 1:
The patent introduces standardized intermediary components (error detection logic, event registers, notification logic) within the retimer device that mediate between the physical link extension function and the error handling system. These intermediaries enable reliable error detection and reporting across extended links by providing a standardized interface for error information exchange between retimer and endpoint devices.
Solution Approach 2:
The patent implements universal error detection and handling mechanisms that work across different link configurations and retimer positions. The standardized error reporting mechanism provides multi-functional capability to detect errors regardless of where they occur in the extended link, and to report them consistently to various system components (upstream/downstream devices, system software).
2Reliability
If standardized error detection mechanisms are implemented in retimer devices, then system reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the error detection and handling functionality into distinct, modular components within the retimer: error detection logic for detecting errors, event registers for storing error information, and notification logic for reporting errors. This segmentation allows each component to be optimized independently and simplifies the overall implementation by dividing the complex fault handling task into manageable functional blocks.
Solution Approach 2:
The retimer device performs self-diagnosis and self-reporting of errors through its integrated error detection logic and event registers. The device monitors its own operational status and automatically generates notifications when errors occur, eliminating the need for external monitoring systems and reducing the complexity of system-wide fault detection mechanisms.
Data Source
AI summary
An extension device is positioned within a point-to-point link to connect two devices, where the extension device includes error detection circuitry to detect a set of errors at the extension device. The extension device further includes memory to store an event register, where the extension device is to write data to the event register to describe detection of an error by the error detection circuitry. The extension device further includes a transmitter to transmit a notification signal to indicate the detection of the error and presence of the data in the event register associated with the error.