linux-kernel - Re: Thunderbolt 3 (Skylake / Alpine Ridge) hotplug

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Message-ID: <56F101C2.7010904@jscinoz.so>
Date:	Tue, 22 Mar 2016 19:26:42 +1100
From:	Jack Coulter <jscinoz@...inoz.so>
To:	Bjorn Helgaas <helgaas@...nel.org>
Cc:	Andreas Noever <andreas.noever@...il.com>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org, "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: Thunderbolt 3 (Skylake / Alpine Ridge) hotplug

Hi Bjorn,

> Can you open a report at http://bugzilla.kernel.org, category
> drivers/PCI, and attach complete "lspci -vv" output (run as root) and
> complete dmesg logs, both when hub is attached at boot, and when
> booting without hub and attaching hub later?
>
> I don't know much about Thunderbolt.  But since it appears as a PCI
> device, I would expect some sort of hotplug notification when you
> attach the hub.  If pciehp handles hotplug, it looks like we should
> see something from pcie_isr() in the dmesg log.
>
> Since you don't see that, I suspect we're getting ACPI notifications
> via the acpiphp driver.  I'm not as familiar with that, so I don't
> know what if anything it logs.  If you're inclined, you could add some
> printks in
>
>   acpiphp_add_context()
>   acpi_device_hotplug()
>   acpiphp_hotplug_notify()
>   hotplug_event()
>
> Then we'd at least see if we get any ACPI notifications.
>
> Bjorn

I've logged a report with the requested details; it can be found here:

https://bugzilla.kernel.org/show_bug.cgi?id=115121



Kind regards,
Jack




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