How to test PCIE-DMA performance?

Hi,

I’m working on Jetson Orin and now I connect Orin with a NVME SSD.

My software version is JetPack 5.0.1

lspci -v

0005:04:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981/PM983 (prog-if 02 [NVM Express])

        Subsystem: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981/PM983

        Flags: bus master, fast devsel, latency 0, IRQ 54

        Memory at 2b28a00000 (64-bit, non-prefetchable) [size=16K]

        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=33 Masked-

        Capabilities: [100] Advanced Error Reporting

        Capabilities: [148] Device Serial Number 00-00-00-00-00-00-00-00

        Capabilities: [158] Power Budgeting 

        Capabilities: [168] Secondary PCI Express

        Capabilities: [188] Latency Tolerance Reporting

        Capabilities: [190] L1 PM Substates

        Kernel driver in use: nvme

How can I use DMA function to transfer data to the SSD and test the transfer/receive performance through DMA on PCIe?

Is there any example test code offered in the kernel driver? If so how to use it?