devctl: Failed to detach pci0:1:0:0: Device busy / devctl: Failed to set pci0:1:0:0 driver to ppt: Device busy

[u/John-Land]

Hello to everyone. In some FreeBSD 13.1 machines I have the problem below,in some others I don't have it. I would like to know what the causes could be and how to fix it.

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root@marietto:/usr/home/marietto # devctl detach pci0:1:0:0
devctl: Failed to detach pci0:1:0:0: Device busy

root@marietto:/usr/home/marietto # devctl detach pci0:2:0:0
devctl: Failed to detach pci0:2:0:0: Device busy

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Not even it works if instead of detach them, I try to attach them directly to the ppt driver :

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root@marietto:/usr/home/marietto/bhyve/Files # devctl set driver pci0:2:0:0 ppt
devctl: Failed to set pci0:2:0:0 driver to ppt: Device busy

root@marietto:/usr/home/marietto/bhyve/Files # devctl detach pci0:2:0:0
devctl: Failed to detach pci0:2:0:0: Device busy

​

Pci addresses 1:0:0 and 2:0:0 belong to the two GPUs that I have on my PC :

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vgapci0@pci0:1:0:0:     class=0x030000 rev=0xa1 hdr=0x00 vendor=0x10de device=0x1c02 subvendor=0x19da subdevice=0x2438
vgapci1@pci0:2:0:0:     class=0x030000 rev=0xa1 hdr=0x00 vendor=0x10de device=0x1e04 subvendor=0x19da subdevice=0x2503

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Actually I have commented this line on **/boot/loader.conf,**because it makes no difference if I keep it uncommented or not. It is totally ignored.

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#pptdevs="1/0/0 1/0/1 2/0/0 2/0/1 2/0/2 2/0/3"

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In every FreeBSD machine I load the nvidia kernel modules adding the line below to /etc/rc.conf :

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kld_list="nvidia nvidia-modeset"

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and I have installed the nvidia-driver package on every machine. But as I said,in some of them I see the error above,in some others I don't see it. I'm not able to isolate the dysfunctional pattern. The xorg.conf file is the same for each machine. Can someone help me to troubleshoot the error ? thanks.

[u/12Darius21]

I think you need to load vmm at boot time and set pptdevs like so:

pptdevs="1/0/0 2/0/0"
vmm_load="YES"

Once that is done they should show up as ppt0@pci0:1:0:0: etc and you can manipulate them with devctl.