Intel® FPGA SDK for OpenCL™: Intel® Stratix® 10 GX FPGA Development Kit Reference Platform Porting Guide

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ID 683809
Date 3/28/2022
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Document Table of Contents
Document Table of Contents x
1. Intel® FPGA SDK for OpenCL™ Intel® Stratix® 10 GX FPGA Development Kit Reference Platform Porting Guide 2. Intel® Stratix® 10 GX FPGA Development Kit Reference Platform Design Architecture 3. Developing Your Intel® Stratix® 10 Custom Platform 4. Document Revision History
1. Intel® FPGA SDK for OpenCL™ Intel® Stratix® 10 GX FPGA Development Kit Reference Platform Porting Guide x
1.1. Introduction to Intel® Reference Platform 1.2. Intel® Stratix® 10 GX FPGA Development Kit Reference Platform: Prerequisites 1.3. Features of the Intel® Stratix® 10 GX FPGA Development Kit Reference Platform 1.4. Contents of the Intel® Stratix® 10 GX FPGA Development Kit Reference Platform
1.3. Features of the Intel® Stratix® 10 GX FPGA Development Kit Reference Platform x
1.3.1. Intel® Stratix® 10 GX FPGA Development Kit Reference Platform Board Variants
2. Intel® Stratix® 10 GX FPGA Development Kit Reference Platform Design Architecture x
2.1. Host-to- Intel® Stratix® 10 FPGA Communication over PCIe® 2.2. DDR4 as Global Memory for OpenCL Applications 2.3. Host Connection to OpenCL Kernels 2.4. Partial Reconfiguration 2.5. Other Components in the Reference Design 2.6. Intel® Stratix® 10 FPGA System Design 2.7. Guaranteed Timing Closure of the Intel® Stratix® 10 GX FPGA Development Kit Reference Platform Design 2.8. Intel® FPGA SDK for OpenCL™ Compilation Flows 2.9. Addition of Timing Constraints 2.10. Connection of the Intel® Reference Platform to the Intel® FPGA SDK for OpenCL™ 2.11. Intel® Stratix® 10 FPGA Programming Flow 2.12. Implementation of Intel® FPGA SDK for OpenCL™ Utilities 2.13. Considerations in Intel® Stratix® 10 GX FPGA Development Kit Reference Platform Implementation
2.1. Host-to- Intel® Stratix® 10 FPGA Communication over PCIe® x
2.1.1. Instantiation of Intel® Stratix® 10 PCIe* Hard IP with Direct Memory Access 2.1.2. Device Identification Registers for Intel® Stratix® 10 PCIe Hard IP 2.1.3. Instantiation of the version_id Component 2.1.4. Board Support Package Software Layer 2.1.5. Direct Memory Access 2.1.6. Message Signaled Interrupt Hardware Considerations Software Considerations 2.1.7. Instantiation of board_cade_id_0 Component – JTAG Cable Autodetect Feature
2.1.4. Board Support Package Software Layer x
2.1.4.1. Common Hardware Constants in Software Headers Files 2.1.4.2. PCIe Kernel Driver 2.1.4.3. Host-to-Device MMD Software Implementation
2.1.5. Direct Memory Access x
2.1.5.1. Implementing a DMA Transfer
2.2. DDR4 as Global Memory for OpenCL Applications x
2.2.1. DDR4 IP Instantiation 2.2.2. DDR4 Connection to PCIe Host 2.2.3. DDR4 Connection to the OpenCL Kernel
2.4. Partial Reconfiguration x
2.4.1. Constant Address Bridge (constant_address_bridge)
2.6. Intel® Stratix® 10 FPGA System Design x
2.6.1. Clocks 2.6.2. Resets 2.6.3. Floorplan 2.6.4. Global Routing 2.6.5. Pipelining 2.6.6. DDR4 Calibration
2.7. Guaranteed Timing Closure of the Intel® Stratix® 10 GX FPGA Development Kit Reference Platform Design x
2.7.1. Supply the Kernel Clock 2.7.2. Guarantee Kernel Clock Timing 2.7.3. Provide a Timing-Closed Post-Fit Netlist
2.8. Intel® FPGA SDK for OpenCL™ Compilation Flows x
2.8.1. Compile Flow 2.8.2. Platform Designer System Generation 2.8.3. QAR/QDB File Generation
2.10. Connection of the Intel® Reference Platform to the Intel® FPGA SDK for OpenCL™ x
2.10.1. Describe the Intel® Stratix® 10 GX FPGA Development Kit Reference Platform to the Intel® FPGA SDK for OpenCL™ 2.10.2. Describe the Intel® Stratix® 10 GX FPGA Development Kit Reference Platform Hardware to the Intel® FPGA SDK for OpenCL™
2.12. Implementation of Intel® FPGA SDK for OpenCL™ Utilities x
2.12.1. aocl install 2.12.2. aocl uninstall 2.12.3. aocl program 2.12.4. aocl flash 2.12.5. aocl diagnose 2.12.6. aocl list-devices
3. Developing Your Intel® Stratix® 10 Custom Platform x
3.1. Initializing Your Intel® Stratix® 10 Custom Platform 3.2. Modifying the Intel® Stratix® 10 GX FPGA Development Kit Reference Platform Design 3.3. Integrating Your Intel® Stratix® 10 Custom Platform with the Intel® FPGA SDK for OpenCL™ 3.4. Setting up the Intel® Stratix® 10 Custom Platform Software Development Environment 3.5. Establishing Intel® Stratix® 10 Custom Platform Host Communication 3.6. Branding Your Intel® Stratix® 10 Custom Platform 3.7. Changing the Device Part Number 3.8. Connecting the Memory in the Intel® Stratix® 10 Custom Platform 3.9. Modifying the Kernel PLL Reference Clock 3.10. Integrating an OpenCL Kernel in Your Intel® Stratix® 10 Custom Platform 3.11. Troubleshooting Intel® Stratix® 10 GX FPGA Development Kit Reference Platform Porting Issues
1. Intel® FPGA SDK for OpenCL™ Intel® Stratix® 10 GX FPGA Development Kit Reference Platform Porting Guide
2. Intel® Stratix® 10 GX FPGA Development Kit Reference Platform Design Architecture
3. Developing Your Intel® Stratix® 10 Custom Platform
4. Document Revision History

2.1.6. Message Signaled Interrupt

The Intel® Stratix® 10 GX FPGA Development Kit Reference Platform uses one MSI line for both DMA and the kernel interface.

Two different modules generate the signal for the MSI line. The DMA controller in the PCIe hard IP core generates the DMA's MSI. The PCI Express interrupt request (IRQ) module (that is, the INTELFPGAOCLSDKROOT/board/s10_ref/hardware/s10gx/ip/irq_controller directory) generates the kernel interface's MSI.

For more information about the PCI Express IRQ module, refer to Handling PCIe Interrupts webpage.

Hardware Considerations

In INTELFPGAOCLSDKROOT/board/s10_ref/hardware/s10gx/board.qsys, the DMA MSI is connected internally; however, you must connect the kernel interface interrupt manually. For the kernel interface interrupt, the PCI Express IRQ module is instantiated as pcie_irq in board.qsys. The kernel interface interrupts connections are as follows:

  • The kernel_irq_to_host port from the OpenCL Kernel Interface (kernel_interface) connects to the interrupt receiver, which allows the OpenCL kernels to signal the PCI Express IRQ module to send an MSI.
  • The PCIe hard IP's msi_intfc port connects to the MSI_Interface port in the PCI Express IRQ module. The kernel interface interrupt receives the MSI address and the data necessary to generate the interrupt via msi_intfc.
  • The IRQ_Gen_Host port on the PCI Express IRQ module, which is used to write the MSI, connects to the txs port on the PCIe hard IP.
  • The IRQ_Read_Agent and IRQ_Mask_Agent ports connect to the pipe_stage_host_ctrl module on Bar 4. After receiving an MSI, the user driver can read the IRQ_Read_Agent port to check the status of the kernel interface interrupt, and read the IRQ_Mask_Agent port to mask the interrupt.

Software Considerations

The interrupt service routine in the Linux driver checks which module generates the interrupt. For the DMA's MSI, the driver reads the DMA descriptor table's status bit in local memory, as specified in the Read DMA Example section of the Intel® Stratix® 10 Avalon-MM DMA Interface for PCIe Solutions User Guide. For kernel interface's MSI, the driver reads the interrupt line sent by the kernel interface.

The interrupt service routine involves the following tasks:

  1. Check DMA status on the DMA descriptor table.
  2. Read the kernel status from the IRQ_READ_Agent port on the PCI Express IRQ module.
  3. If a kernel interrupt was triggered, mask the interrupt by writing to the IRQ_MASK_Agent port on the PCI Express IRQ module. Then, execute the kernel interrupt service routine.
  4. If a DMA interrupt was triggered, reset the DMA descriptor table and execute the DMA interrupt service routine.
  5. If applicable, unmask a masked kernel interrupt.
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