Hello,
I hope this is the correct mailing list to ask my question.
Looking at "/sys/bus/pci/drivers/xxxxx/" I see a bunch of files, which (for a lack of better term) I will call "interfaces" and they can be used to associate a device with a driver. E.g.:
```
$ ls /sys/bus/pci/drivers/vfio-pci/
bind module new_id remove_id uevent unbind
```
For example I can use `bind` or `new_id` to bind a driver to a device:
```
sudo bash -c "echo '0000:${PCI_ADDRESS}' > '/sys/bus/pci/drivers/vfio-pci/bind'"
sudo bash -c "echo '${VENDOR_ID} ${DEVICE_ID}' > '/sys/bus/pci/drivers/vfio-pci/new_id'"
```
and I can use `unbind` to unbind the currently used driver from a device:
```
sudo bash -c "echo '0000:${PCI_ADDRESS}' > '/sys/bus/pci/drivers/${DRIVER}/unbind'"
```
My problem is that I can find no official documentation on these "interfaces" (`bind`, `unbind`, `new_id`, `remove_id`,`uevent`).
It seems to me that I have to use `new_id` to bind the driver for the first time after a reboot and if I then unbind it again, I have to use `bind` instead of `new_id` until I reboot again.
If I use `remove_id` after using `new_id`, I have to use `new_id` again the next time.
But if I use `remove_id` before using `new_id`, I get an error (`echo: write error: No such device`). Same for using `bind` before using `new_id` first.
I have 3 questions now:
1. Are my assumptions correct?
2. If so, how can I check which of these "interfaces" I need (`new_id` vs `bind`) without blindly executing them an then checking if it failed?
3. What are each of these "interfaces" actually doing and how do you use them correctly?
Thanks in advance. I hope I'm doing this correctly, this is my first time on a mailing list.
Best regards
linux.enthusiast
