Subject: Re: Thunderbolt 3 (Skylake / Alpine Ridge) hotplug
To: Bjorn Helgaas <helgaas@kernel.org>
References: <56D0085B.60402@jscinoz.so> <20160315172909.GF19974@localhost>
Cc: Andreas Noever <andreas.noever@gmail.com>, linux-pci@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
        "Rafael J. Wysocki" <rafael@kernel.org>
From: Jack Coulter <jscinoz@jscinoz.so>
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Date: Tue, 22 Mar 2016 19:26:42 +1100
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From: Jack Coulter <jscinoz@jscinoz.so>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: Andreas Noever <andreas.noever@gmail.com>, linux-pci@vger.kernel.org,
 linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org,
 "Rafael J. Wysocki" <rafael@kernel.org>
Message-ID: <56F101C2.7010904@jscinoz.so>
Subject: Re: Thunderbolt 3 (Skylake / Alpine Ridge) hotplug
References: <56D0085B.60402@jscinoz.so> <20160315172909.GF19974@localhost>
In-Reply-To: <20160315172909.GF19974@localhost>

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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=3D115121


Kind regards,
Jack


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