R540 driver incompatibility with nv-p2p.h

[Calderweis]

Im on the Jetson Orin Nano and running ;
+---------------------------------------------------------------------------------------+
| NVIDIA-SMI 540.4.0 Driver Version: 540.4.0 CUDA Version: 12.6 |
|-----------------------------------------+----------------------+----------------------+
| GPU Name Persistence-M | Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap | Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|=========================================+======================+======================|
| 0 Orin (nvgpu) N/A | N/A N/A | N/A |
| N/A N/A N/A N/A / N/A | Not Supported | N/A N/A |
| | | N/A |
+-----------------------------------------+----------------------+----------------------+

+---------------------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=======================================================================================|
| No running processes found |
+---------------------------------------------------------------------------------------+

cat /etc/nv_tegra_release
# R36 (release), REVISION: 4.3, GCID: 38968081, BOARD: generic, EABI: aarch64, DATE: Wed Jan 8 01:49:37 UTC 2025
# KERNEL_VARIANT: oot
TARGET_USERSPACE_LIB_DIR=nvidia
TARGET_USERSPACE_LIB_DIR_PATH=usr/lib/aarch64-linux-gnu/nvidia

The error :
mismatch between the function signatures defined in gdrcopy/src/gdrdrv/nv-p2p-dummy.c and the declarations in the nv-p2p.h header file (/usr/src/nvidia/nvidia-oot/include/linux/nv-p2p.h

[drossetti]

@Calderweis gdrcopy does not support Tegra nvGPU.
Also note that nv-p2p has gone through heavy rework on CUDA13.0/R580, to the point that nv-p2p is not supported when using OpenRM and is discouraged on nvGPU.
Customers should switch to standard Linux kernel APIs, like pin_user_pages() with FOLL_LONGTERM.
Could you please close this issue? Thanks