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Linux/AM5728: PCIe RC driver EDMA support

vefone
Expert 2440 points
Part Number: AM5728


Tool/software: Linux

Hi,

TI,

I now use am5728(run linux) to communicate with FPGA，but I found the speed is very slow,because I use mmap and memcpy function to do it.

I want to use edma to finish the communication,so I want to know whether the pcie rc driver support edma.

Is there a reference?

BR,

vefone

  • 0
    TI__Guru**** 393215 points
    The software team have been notified. They will respond here.
  • 0 in reply to Biser Gatchev-XID
    TI__Guru 50170 points
    Hi, Vefone,

    None of the PCI host controller drivers in linux uses DMA since the use case is limited to programming the PCI device (memory space/registers mapped in EP BAR's). The EP's use it's own DMA to transfer data to RC buffers.

    We'd like to know your use case. What kind of data will be transferred between RC and EP, and also:
    1) Does the Endpoint have DMA? If EP has DMA will it help and is the DMA on RC still needed?
    2) Are you looking for user space API to program DMA?

    Rex
  • 0 in reply to Rex Chang
    TI__Guru 50170 points
    Hi, Vefong,

    We evaluated your requirement and wonder if you can take drivers/dma/dmatest.c as an example to do memcopy DMA to a mapped region?
    If you don't have other questions, I'll close this thread. For any other issues, please submit a new thread.

    Thanks!

    Rex