No dma_proxy_tx and dma_proxy_rx under /dev

[muuzoo]

https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/1027702787/Linux+DMA+From+User+Space+2.0

I followed "Linux Dma From User Space 2" tutorial.and compiled the kernel module and the application without any problems. But node is not created for rx and tx under /dev directory. In dmesg I can see DMA detected. My petalinux verison is 2022.1

fz3dma:/mnt/usb# dmesg | grep -i dma
[ 0.000000] DMA32 [mem 0x0000000000000000-0x00000000ffffffff]
[ 0.801761] DMA: preallocated 512 KiB GFP_KERNEL pool for atomic allocations
[ 0.807863] DMA: preallocated 512 KiB GFP_KERNEL|GFP_DMA32 pool for atomic allocations
[ 3.119533] iommu: DMA domain TLB invalidation policy: strict mode
[ 5.259805] xilinx-zynqmp-dma fd500000.dma-controller: ZynqMP DMA driver Probe success
[ 5.267896] xilinx-zynqmp-dma fd510000.dma-controller: ZynqMP DMA driver Probe success
[ 5.275976] xilinx-zynqmp-dma fd520000.dma-controller: ZynqMP DMA driver Probe success
[ 5.284072] xilinx-zynqmp-dma fd530000.dma-controller: ZynqMP DMA driver Probe success
[ 5.292165] xilinx-zynqmp-dma fd540000.dma-controller: ZynqMP DMA driver Probe success
[ 5.300255] xilinx-zynqmp-dma fd550000.dma-controller: ZynqMP DMA driver Probe success
[ 5.308341] xilinx-zynqmp-dma fd560000.dma-controller: ZynqMP DMA driver Probe success
[ 5.316421] xilinx-zynqmp-dma fd570000.dma-controller: ZynqMP DMA driver Probe success
[ 5.324568] xilinx-zynqmp-dma ffa80000.dma-controller: ZynqMP DMA driver Probe success
[ 5.332655] xilinx-zynqmp-dma ffa90000.dma-controller: ZynqMP DMA driver Probe success
[ 5.340737] xilinx-zynqmp-dma ffaa0000.dma-controller: ZynqMP DMA driver Probe success
[ 5.348812] xilinx-zynqmp-dma ffab0000.dma-controller: ZynqMP DMA driver Probe success
[ 5.356911] xilinx-zynqmp-dma ffac0000.dma-controller: ZynqMP DMA driver Probe success
[ 5.364996] xilinx-zynqmp-dma ffad0000.dma-controller: ZynqMP DMA driver Probe success
[ 5.373075] xilinx-zynqmp-dma ffae0000.dma-controller: ZynqMP DMA driver Probe success
[ 5.381157] xilinx-zynqmp-dma ffaf0000.dma-controller: ZynqMP DMA driver Probe success
[ 5.389471] xilinx-zynqmp-dpdma fd4c0000.dma-controller: Xilinx DPDMA engine is probed
[ 5.603420] mmc1: SDHCI controller on ff170000.mmc [ff170000.mmc] using ADMA 64-bit
[ 5.612961] mmc0: SDHCI controller on ff160000.mmc [ff160000.mmc] using ADMA 64-bit
[ 5.888179] systemd[1]: Hostname set to .

And I can load dma-proxy module with modpreobe command without error.

fz3dma:/mnt/usb# modprobe dma-proxy
[ 225.995027] dma_proxy: loading out-of-tree module taints kernel.
fz3dma:/mnt/usb# lsmod
Module Size Used by
dma_proxy 16384 0
uio_pdrv_genirq 16384 0

Here is the ls of /dev

[Livius90]

Did you make a device-tree overlay for dma-proxy? Firstly it need to be loaded then you can use modprobe.