Bug 615558 – x11-drivers/nvidia-drivers - udev rule should create /dev/nvidia-uvm

• Product: Gentoo Linux
• Status: RESOLVED DUPLICATE

[Description Plero H 2017-04-14 16:05:41 UTC]

nvidia-drivers do not create uvm device, even when uvm flag is set.
So we must execute the script of http://docs.nvidia.com/cuda/cuda-installation-guide-linux/index.html#runfile-verifications every time we want to use cuda.

Instead we could create a udev rule to create the device when uvm module is loaded.
This udev rule could create the device itself or run the proposed script by nvidia.

My proposed udev rule:

ACTION=="add", SUBSYSTEM=="module", DEVPATH=="/module/nvidia_uvm", PROGRAM="/bin/grep nvidia-uvm /proc/devices", ENV{dev_num}="%c{1}", RUN+="/bin/mknod -m 666 /dev/nvidia-uvm c $env{dev_num} 0"

Please include that udev rule when uvm flag is set and if possible propose this udev rule upstream.

Reproducible: Always

[Comment 1 Jeroen Roovers (RETIRED) 2017-04-25 07:50:20 UTC]

Works for me and you didn't include any information about your system so I guess you need to read the bug reporting guidelines before you continue.

[Comment 2 Plero H 2017-05-14 21:09:41 UTC]

Can you please elaborate more?
Does your system creates a uvm device?
I removed 'sometimes' from the title, it's misleading.

[Comment 3 Jeroen Roovers (RETIRED) 2017-09-27 12:52:43 UTC]

(In reply to Plero H from comment #0)
> My proposed udev rule:
> 
> ACTION=="add", SUBSYSTEM=="module", DEVPATH=="/module/nvidia_uvm",
> PROGRAM="/bin/grep nvidia-uvm /proc/devices", ENV{dev_num}="%c{1}",
> RUN+="/bin/mknod -m 666 /dev/nvidia-uvm c $env{dev_num} 0"

Are you sure that should be read/write for all users?

[Comment 4 Jeroen Roovers (RETIRED) 2018-01-27 12:37:20 UTC]

*** This bug has been marked as a duplicate of bug 506696 ***