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ikwzm / udmabuf

User space mappable dma buffer device driver for Linux.

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petalinux2020.2 do not work with u-dma-buf

roundchen opened this issue · comments

commented

Hi ikwzm

I'm using u-dma-buf (master branch)on a Zynq MPSoC Ultrascale+ board (ZCU111),and I use xilinx offer petalinux bsp for zcu111 with the petalinux version is 2020.2.
I compile u-dma-buf.c and insmod it install well. then I run the test program a.out ( u-dma-buf_test.c) ,there is a Segmentation fault .
It seems u-dma-buf can not work with petalinux 2020.2

then I compile u-dma-buf.c in petalinux 2019.1,it work well

thanks

root@xilinx-zcu111-2020_2:# mount /dev/mmcblk0p1 /mnt
[ 54.788933] /dev/mmcblk0p1: Can't open blockdev
root@xilinx-zcu111-2020_2:#
root@xilinx-zcu111-2020_2:~# cd /mnt
root@xilinx-zcu111-2020_2:/mnt#
048576ilinx-zcu111-2020_2:/mnt# insmod u-dma-buf.ko udmabuf0=78643200 udmabuf1=1048576
[ 54.867568] u_dma_buf: loading out-of-tree module taints kernel.
[ 54.896593] u-dma-buf udmabuf0: driver version = 3.2.4
[ 54.901732] u-dma-buf udmabuf0: major number = 242
[ 54.906689] u-dma-buf udmabuf0: minor number = 0
[ 54.911482] u-dma-buf udmabuf0: phys address = 0x0000000068500000
[ 54.917747] u-dma-buf udmabuf0: buffer size = 78643200
[ 54.923144] u-dma-buf u-dma-buf.0: driver installed.
[ 54.929525] u-dma-buf udmabuf1: driver version = 3.2.4
[ 54.934669] u-dma-buf udmabuf1: major number = 242
[ 54.939632] u-dma-buf udmabuf1: minor number = 1
[ 54.944418] u-dma-buf udmabuf1: phys address = 0x000000006d000000
[ 54.950680] u-dma-buf udmabuf1: buffer size = 1048576
[ 54.955987] u-dma-buf u-dma-buf.1: driver installed.
root@xilinx-zcu111-2020_2:/mnt#
root@xilinx-zcu111-2020_2:/mnt# ./a.out
phys_addr=0x68500000
size=78643200
check_buf()
Segmentation fault

rfsoc_ps(2021-3-5 18_27_51).txt

commented

I solve this problem using petalinux generated kernel compile u-dma-buf.c
when I download linux-xlnx and compiled as the kernel to compile u-dma-buf.c ,this problem appear.
thank you for your contribution to open Source

commented

Thank you for the issue.

This issue did not occur with 5.4.0-xlnx-v2020.2-zynqmp-fpga provided by ZynqMP-FPGA-Linux. 5.4.0-xlnx-v2020.2-zynqmp-fpga is not built using PetaLinux.

I'm not using PetaLinux, so it's not easy to solve this problem.
Please provide any information.