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

Oliver Neukum
2021-04-27T12:00:00Z

Am Montag, den 26.04.2021, 13:01 +0000 schrieb David Laight:
> From: Rafael J. Wysocki
> > Sent: 26 April 2021 12:49
> >
> > On Mon, Apr 26, 2021 at 11:17 AM Oliver Neukum <oneukum@suse.com> wrote:
> > > Am Freitag, den 23.04.2021, 19:16 -0700 schrieb Rajat Jain:
> > > > Export the already available info, to the userspace via the
> > > > device core, so that userspace can implement whatever policies it
> > > > wants to, for external removable devices.
> > >
> > > Hi,
> > >
> > > is there a way to tell apart whether a device can undergo regular
> > > surprise removal?
> >
> > PCI devices located under a removable parent can undergo surprise
> > removal. The ones on a Thunderbolt chain too.
> >
> > > Do we want that?
> >
> > Do you mean surprise removal? Yes, we do.
>
> Always been true - think of cardbus (PCI pcmcia) cards with
> PCI bridges to external PCI expansion chassis containing
> additional PCI slots.
> The cardbus card is hot removable.

Hi,

that is true for those options, but not for the style
of PCI hotplug which requires you to push a button and wait
for the blinking light.

REgards
Oliver