Experimental Physics and
Industrial Control System

> Does anyone have to experience generic DMA support for the  Xilinx Zynq or Zynq ultrascal+ core or have a plan for the development?

Not sure what you mean by "generic" DMA support. Couple of software and firmware developers here at ESS are working on a firmware using XDMA ip core, that is supported by Xilinx xdma kernel driver (sources online). Running on the Ultrascale FPGA (not zynq) on an AMC sitting in a uTCA crate. This means we are not developing our own DMA / PCIe core but utilizing Xilinx one, available free of charge.
Some preliminary tested are showing ~88% PCIe link utilization when transferring data in bulk over DMA; i.e. Gen3 4 lanes rate is ~3.5 GB/s card to host.

All of this is still in prototyping stage.

We have no EPICS driver for this, yet. The plan is to, first develop userpace library that would abstract away details and let the user work with clocks, triggers, data channels..; compared to to "raw FPGA registers". Then, the EPICS driver will be built on top of this userspace library.

//hinko
________________________________________
From: Tech-talk <[email protected]> on behalf of Ha, Kiman via Tech-talk <[email protected]>
Sent: Saturday, November 9, 2019 11:22:03 PM
To: [email protected]
Subject: Linux DMA driver and device support for Xilinx FPGA

Hello,

I am looking for the DMA driver and epics device support module for the Xilinx Zynq and Zynq ultrascal+ core.
Does anyone have to experience generic DMA support for the  Xilinx Zynq or Zynq ultrascal+ core or have a plan for the development?

For example, we developed four channel 500 MHz digitizer for the bunch by bunch beam position monitor (performance looks good, < 300 nm turn by tune position for the NSLS-II).
Currently, prototype supports an FPGA logic block ram (BRAM, 8 K/16 K * 16bit * 4, 500MHz clock rate) .
I have plan provides at least 1 M * 16bit * 4)  or 2 M points from the external DDR3/4 memory (FPGA side we implemented DMA core, but Linux part needs help) .
Because our physics group wants to minimum 1000 turns BxB position data.
If we have an epics device support, that’s very valuable for many diagnostics applications, especially beam diagnostics and physics applications.

Thanks,
Kiman

Replies:

Re: Linux DMA driver and device support for Xilinx FPGA Ralph Lange via Tech-talk

RE: Linux DMA driver and device support for Xilinx FPGA Ha, Kiman via Tech-talk

References:

Linux DMA driver and device support for Xilinx FPGA Ha, Kiman via Tech-talk

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