PCIe Interrupt Routing in FPGA for Multi-Type Processor Compatibility
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Solution Overview
Problem
FPGA-based cloud platforms face compatibility issues with processor interrupts, requiring re-design and firmware upgrades when interrupt types change, leading to increased maintenance and development time.
Innovation Solution
A PCIe interrupt processing method that determines the supported interrupt type by an FPGA based on an interrupt vector signal, using corresponding target processing mechanisms to process internal interrupts without modifying logic codes, enabling compatibility with multiple interrupt types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the FPGA logic design is configured to support only one interrupt type for simple development cooperation, then the ease of manufacture is improved, but the adaptability deteriorates
Solution Approach 1:
The patent implements a universal interrupt processing mechanism that can handle multiple interrupt types (INTx, MSI, MSIX) through a unified architecture. The FPGA logic design incorporates an interrupt type identification module that automatically detects the interrupt type and routes it to the appropriate processing path, enabling one logic design to support multiple interrupt types without requiring separate designs for each type.
Solution Approach 2:
The patent introduces dynamic configuration capabilities where the interrupt processing mechanism can adapt its behavior based on the detected interrupt type. The system dynamically selects processing paths and configures parameters according to the specific interrupt type (INTx, MSI, or MSIX), allowing the same hardware logic to flexibly accommodate different interrupt protocols without reconfiguration or redesign.
2Adaptability or versatility
If the interrupt type is changed during platform upgrade, then the adaptability is improved, but the device complexity increases due to requiring logic modification and firmware upgrade
Solution Approach 1:
The patent segments the interrupt processing functionality into distinct modular components: an interrupt type identification module, a processing path selection module, and multiple specialized processing sub-modules for different interrupt types. This segmentation allows the system to handle multiple interrupt types through a unified architecture without requiring complex interconnections or modifications to the overall logic design.
Solution Approach 2:
The patent introduces an intermediary interrupt type identification module that acts as a mediator between the interrupt input and the processing logic. This intermediary automatically detects the interrupt type and directs the processing to the appropriate path, eliminating the need for complex conditional logic throughout the system and simplifying the overall device architecture while maintaining adaptability to different interrupt types.
3Measurement precision
If the FPGA logic is re-written for each interrupt type upgrade, then the measurement precision of interrupt type support is improved, but the loss of time increases due to re-design and firmware upgrade periods
Solution Approach 1:
The patent incorporates preliminary action by pre-configuring the FPGA logic design to include support for multiple interrupt types (INTx, MSI, and MSIX) from the outset. The interrupt processing mechanism is designed in advance with all necessary processing paths and configuration options, eliminating the need for subsequent re-design or firmware upgrades when transitioning between interrupt types. This preliminary comprehensive design ensures precise support for multiple interrupt types while avoiding time losses associated with iterative modifications.
Data Source
AI summary
Provided are a PCIe interrupt processing method and apparatus, a device and a non-transitory readable storage medium, relating to the technical field of computers. The PCIe interrupt processing method comprises: a currently generated internal interrupt signal is acquired; a PCIe interrupt type supported by a current FPGA is determined according to an interrupt vector signal output by a PCIe IP core, so as to determine a corresponding target interrupt processing mechanism according to the PCIe interrupt type; and the internal interrupt signal is processed by means of the target interrupt processing mechanism, and a processing result is input to the PCIe IP core, such that the PCIe IP core sends an interrupt message packet to a central processing unit on the basis of the processing result. The technical solution expands the compatibility of an FPGA with processor interrupts, facilitating the implementation of FPGA logic platform construction.