Re: [PATCH v2 2/2] pci: Support "removable" attribute for PCI devices

[Rajat Jain]

On Thu, Apr 29, 2021 at 2:58 AM Rafael J. Wysocki <rafael@xxxxxxxxxx> wrote:
>
> On Thu, Apr 29, 2021 at 11:03 AM Oliver Neukum <oneukum@xxxxxxxx> wrote:
> >
> > Am Mittwoch, den 28.04.2021, 14:21 +0200 schrieb Rafael J. Wysocki:
> >
> > > In principle, in the wake of Thunderbolt every PCI driver handling
> > > PCIe devices needs to be able to deal with a device that's gone away
> > > without notice, because in principle any PCIe device can be included
> > > into a Thunderbolt docking station which may go away as a whole
> > > without notice.
> >
> > Yes, but we are dealing with what we export to user space, don't we?
>
> Right, so it would be good to know why exporting this information to
> user space is desired.

For us, the driving motivation is to implement policies in userspace
for user removable devices. Eg:

* Tracking the statistics around usage of user removable devices (how
many users use such devices, how often etc).
* Removing user removable devices when a user logs out.
* Not allowing a new user removable device while the screen is locked.
* (perhaps additional such policies in future).

Thanks,

Rajat