Dynamic Interrupt Priority Management in Storage Controllers
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Solution Overview
Problem
Current storage systems face challenges in dynamically managing interrupt priorities at runtime without requiring downtime, as existing firmware-based solutions necessitate offline updates and extensive testing for compatibility across various configurations, leading to inefficiencies and potential integration issues.
Innovation Solution
Implementing a storage system with a processor and memory that allows for dynamic modification of interrupt priorities based on received criteria, separate from the compiled firmware, enabling on-the-fly adjustments without halting operations, and optionally utilizing a Programmable Interrupt Controller (PIC) for prioritization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If interrupt priorities are defined at the hardcoded firmware level, then interrupt processing is stable and reliable, but the storage controller must be taken offline to modify priorities and extensive testing is required
Solution Approach 1:
The patent segments the interrupt priority management into two independent parts: the firmware (which remains stable and runs continuously) and the interrupt priority data structure (which can be dynamically modified). By separating the priority definitions from the firmware code and storing them in accessible memory, the system allows priority changes without requiring firmware updates or controller shutdown, thus resolving the contradiction between adaptability and downtime.
Solution Approach 2:
The patent implements dynamic interrupt priority management by allowing the interrupt priority data structure to be modified at runtime. The processor can read and modify priority values in memory while the storage controller continues to operate, enabling flexible priority reconfiguration without system interruption. This dynamic approach eliminates the need for offline firmware updates while maintaining stable interrupt processing.
2Adaptability or versatility
If firmware is replaced to change interrupt priorities, then priority management is updated, but the storage controller requires offline re-initialization and extensive integration testing
Solution Approach 1:
The patent extracts the interrupt priority definitions from the firmware code and places them in separate, accessible memory structures. This extraction allows the priorities to be modified independently of the firmware, eliminating the need for complete firmware replacement. The firmware remains unchanged and continues to function, while only the priority data needs to be updated, significantly reducing update complexity and testing requirements.
Solution Approach 2:
The patent creates a copy of the interrupt priority data in accessible memory that can be modified without affecting the original firmware. The processor reads from this copyable priority structure rather than from hardcoded firmware, allowing multiple copies or versions of priority configurations to exist simultaneously. This copying mechanism enables easy updates and A/B testing without risking system stability.
3Adaptability or versatility
If interrupt priorities are modified in firmware, then new priorities are implemented, but integration issues may arise and extensive pre-production testing is required
Solution Approach 1:
The patent implements a safe modification mechanism where interrupt priorities are changed in a controlled manner with proper synchronization. The system uses memory barriers and atomic operations to ensure that priority changes are completed atomically, preventing partial or inconsistent state transitions. This beforehand cushioning through careful synchronization protocols ensures that modifications do not compromise system reliability or create integration issues, eliminating the need for extensive testing.
Solution Approach 2:
The patent introduces an intermediary layer between the firmware and the interrupt handling logic. This intermediary is the accessible memory structure that holds priority data, acting as a buffer that decouples the stable firmware from the modifiable priority configurations. Changes in this intermediary layer do not directly impact the firmware's internal consistency, thereby maintaining system reliability while enabling customization.
Data Source
AI summary
Methods and systems for advanced interrupt processing and scheduling are provided. The system comprises a memory operable to store interrupt priorities, an interface, and a processor operable to acquire incoming interrupts and to handle the incoming interrupts according to the interrupt priorities. The processor is also operable to receive interrupt processing criteria from the interface (sent, for example, from a device not directly coupled with the system), and to modify the interrupt priorities of the memory based upon the interrupt processing criteria without losing incoming processing requests for the system. Additionally, the processor is operable to process the incoming interrupts according to the modified interrupt priorities responsive to modifying the interrupt priorities.