PCIE test probelem

Hi,

I’m using Jetson Orin Nx Developer Kit and a PC to test PCIE dma transfer with pci_endpoint_test.c provided by kernel.

Orin Nx board configed by this link
https://docs.nvidia.com/jetson/archives/r35.4.1/DeveloperGuide/text/SD/Communications/PcieEndpointMode.html?highlight=pcie

Connecting and Configuring the Devices Section

On PC side modify and build the PCI_endpoint_test.c module and insert into kernel

then build pci_epf_test.c to make pcitest function

/dev/pci-endpoint-test.0 can be found

but when i try to run pcitest the task always blocked and the dmesg shows

 [  846.921118] INFO: task pcitest:3418 blocked for more than 120 seconds.

[  846.921135]       Tainted: G           OE     5.15.0-89-generic #99~20.04.1-Ubuntu

[  846.921141] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

[  846.921143] task:pcitest         state:D stack:    0 pid: 3418 ppid:  3311 flags:0x00000000

[  846.921155] Call Trace:

[  846.921159]  

[  846.921165]  __schedule+0x2cd/0x890

[  846.921179]  ? usleep_range_state+0x90/0x90

[  846.921188]  schedule+0x69/0x110

[  846.921194]  schedule_timeout+0x206/0x2d0

[  846.921203]  ? putname+0x57/0x70

[  846.921209]  ? usleep_range_state+0x90/0x90

[  846.921216]  __wait_for_common+0xb0/0x160

[  846.921224]  wait_for_completion+0x24/0x30

[  846.921232]  pci_endpoint_test_ioctl+0x92f/0xcd7 [pci_endpoint_test]

[  846.921242]  __x64_sys_ioctl+0x92/0xd0

[  846.921249]  do_syscall_64+0x59/0xc0

[  846.921256]  entry_SYSCALL_64_after_hwframe+0x62/0xcc

[  846.921262] RIP: 0033:0x7f28999ac3ab

[  846.921267] RSP: 002b:00007ffd229622d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010

[  846.921274] RAX: ffffffffffffffda RBX: 000056398a36e004 RCX: 00007f28999ac3ab

[  846.921277] RDX: 00007ffd229622e0 RSI: 0000000040085005 RDI: 0000000000000003

[  846.921281] RBP: 000056398ac872a0 R08: 0000000000000000 R09: 0000000000000000

[  846.921284] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffea

[  846.921287] R13: 0000000000000003 R14: 00007ffd229622e0 R15: 0000000000000001

[  846.921292]  

the lspci shows

0000:05:00.0 RAM memory: NVIDIA Corporation Device 0001

	Flags: bus master, fast devsel, latency 0, IRQ 168

	Memory at 85e00000 (32-bit, non-prefetchable) [size=64K]

	Memory at 6001e00000 (64-bit, prefetchable) [size=128K]

	Memory at 85e10000 (64-bit, non-prefetchable) [size=4K]

	Capabilities: [40] Power Management version 3

	Capabilities: [50] MSI: Enable+ Count=1/1 Maskable+ 64bit+

	Capabilities: [70] Express Endpoint, MSI 00

	Capabilities: [b0] MSI-X: Enable- Count=8 Masked-

	Capabilities: [100] Advanced Error Reporting

	Capabilities: [148] Secondary PCI Express

	Capabilities: [168] Physical Layer 16.0 GT/s 

	Capabilities: [18c] Lane Margining at the Receiver 

	Capabilities: [1a4] Latency Tolerance Reporting

	Capabilities: [1ac] L1 PM Substates

	Capabilities: [1bc] Vendor Specific Information: ID=0002 Rev=4 Len=100 

	Capabilities: [2bc] Vendor Specific Information: ID=0001 Rev=1 Len=038 

	Capabilities: [2f4] Data Link Feature 

	Capabilities: [300] Precision Time Measurement

	Capabilities: [30c] Vendor Specific Information: ID=0003 Rev=1 Len=054 

	Capabilities: [374] Vendor Specific Information: ID=0006 Rev=0 Len=018 

	Kernel driver in use: pci-endpoint-test

	Kernel modules: pci_endpoint_test

need some help