linux-kernel - Re: [PATCH] pci: support Thunderbolt requirements for I/O resources.

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Date:	Wed, 12 Nov 2014 21:19:05 +0100
From:	Andreas Noever <andreas.noever@...il.com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>
Cc:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Michael Jamet <michael.jamet@...el.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	amir.jer.levy@...el.com, dan.alloun@...el.com,
	Rafael Wysocki <rjw@...ysocki.net>
Subject: Re: [PATCH] pci: support Thunderbolt requirements for I/O resources.

On Wed, Nov 12, 2014 at 7:30 PM, Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
> On Wed, Nov 12, 2014 at 7:29 PM, Bjorn Helgaas <bhelgaas@...gle.com> wrote:
>
> []
>
>>> To prevent this, we detect a chain contains a Thunderbolt
>>> device by checking the Thunderbolt PCI device id.
>>
>> I'm really not happy about checking a list of device IDs to identify
>> Thunderbolt devices.  Surely there's a better way, because a list like
>> this has to be updated regularly.
>
> I recently proposed internally to use quirks (pci_fixup_early) for
> that, but apparently Michael didn't have time to answer. It might be
> he can just comment here since the patch already public.

In any case: this will interfere with thunderbolt hotplug on Apple
systems, where we do not have BIOS support and have to handle hotplug
events and assign resources ourselves. So please add a DMI check for
Apple (the reverse of what we do in
http://lxr.free-electrons.com/source/drivers/thunderbolt/nhi.c?v=3.17#L664
).

Thanks,
Andreas
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