Re: [PATCH 2/6] thunderbolt: Add support for PCIe tunneling disabled (SL5)

[Mika Westerberg <mika.westerberg@linux.intel.com>]

On Tue, Jan 26, 2021 at 06:18:47PM +0200, Yehezkel Bernat wrote:
> On Tue, Jan 26, 2021 at 5:57 PM Mika Westerberg
> <mika.westerberg@linux.intel.com> wrote:
> >
> > Recent Intel Thunderbolt firmware connection manager has support for
> > another security level, SL5, that disables PCIe tunneling. This option
> > can be turned on from the BIOS.
> >
> > When this is set the driver exposes a new security level "nopcie" to the
> > userspace and hides the authorized attribute under connected devices.
> >
> > While there we also hide it when "dponly" security level is enabled
> > since it is not really usable in that case anyway.
> >
> > Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
> > ---
> 
> Looks good to me, I'm just not sure I understand how this is different from
> dponly mode. Is this just because it comes from the new _OSC?

The firmware connection manager reports this new security level instead
of dponly so we reflect that to the userspace, and while at it take
advantage of the nopcie when USB4 _OSC disables PCIe tunneling so they
both look the same from userspace perspective.