From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Lukas Wunner <lukas@wunner.de>
Cc: Bjorn Helgaas <helgaas@kernel.org>,
Mario Limonciello <mario.limonciello@amd.com>,
Bjorn Helgaas <bhelgaas@google.com>,
"open list:PCI SUBSYSTEM" <linux-pci@vger.kernel.org>,
"open list:THUNDERBOLT DRIVER" <linux-usb@vger.kernel.org>,
"open list:RADEON and AMDGPU DRM DRIVERS"
<amd-gfx@lists.freedesktop.org>,
"open list:DRM DRIVERS" <dri-devel@lists.freedesktop.org>,
"open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS"
<nouveau@lists.freedesktop.org>,
Hans de Goede <hdegoede@redhat.com>,
Michael Jamet <michael.jamet@intel.com>,
Yehezkel Bernat <YehezkelShB@gmail.com>,
Alexander.Deucher@amd.com,
Andreas Noever <andreas.noever@gmail.com>
Subject: Re: [PATCH v3 05/12] PCI: Detect root port of internal USB4 devices by `usb4-host-interface`
Date: Mon, 14 Feb 2022 13:11:54 +0200 [thread overview]
Message-ID: <Ygo4+sfeHhQeSUEa@lahna> (raw)
In-Reply-To: <Ygo1eoVe8D0b80QF@lahna>
On Mon, Feb 14, 2022 at 01:11:05PM +0200, Mika Westerberg wrote:
> > > It is used to identify "tunneled" ports (whether PCIe, USB 3.x or
> > > DisplayPort). Tunnels are created by software (in Linux it is the
> > > Thunderbolt driver) and are dynamic in nature. The USB4 links go over
> > > USB Type-C cable which also is something user can plug/unplug freely.
> > >
> > > I would say it is reasonable expectation that anything behind these
> > > ports can be assumed as "removable".
> >
> > USB gadgets may be soldered to the mainboard. Those cannot be
> > unplugged freely. It is common practice to solder USB Ethernet
> > or USB FTDI serial ports and nothing's preventing a vendor to solder
> > USB4/Thunderbolt gadgets.
>
> Right, that's why I say it is "reasonable expectation" that anything
> behind these ports can be assumed "removable" :) Of course they don't
> have to be but if we assume that in the driver where this actually
> matters we should be on the safe side, no?
Also the tunnels are not permanent anyway.
next prev parent reply other threads:[~2022-02-14 11:32 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-11 19:32 [PATCH v3 00/12] Overhaul `is_thunderbolt` Mario Limonciello
2022-02-11 19:32 ` [PATCH v3 01/12] thunderbolt: move definition of PCI_CLASS_SERIAL_USB_USB4 Mario Limonciello
2022-02-11 21:02 ` Bjorn Helgaas
2022-02-11 19:32 ` [PATCH v3 02/12] PCI: Move `is_thunderbolt` check for lack of command completed to a quirk Mario Limonciello
2022-02-11 21:20 ` Bjorn Helgaas
2022-02-11 19:32 ` [PATCH v3 03/12] PCI: Move check for old Apple Thunderbolt controllers into " Mario Limonciello
2022-02-11 21:35 ` Bjorn Helgaas
2022-02-11 22:06 ` Limonciello, Mario
2022-02-14 7:15 ` Mika Westerberg
2022-02-13 9:19 ` Lukas Wunner
2022-02-13 9:21 ` Lukas Wunner
2022-02-14 7:23 ` Mika Westerberg
2022-02-11 19:32 ` [PATCH v3 04/12] PCI: Drop the `is_thunderbolt` attribute from PCI core Mario Limonciello
2022-02-13 8:20 ` Lukas Wunner
2022-02-13 17:26 ` Limonciello, Mario
2022-02-14 7:27 ` Mika Westerberg
2022-02-11 19:32 ` [PATCH v3 05/12] PCI: Detect root port of internal USB4 devices by `usb4-host-interface` Mario Limonciello
2022-02-11 21:45 ` Bjorn Helgaas
2022-02-14 7:34 ` Mika Westerberg
2022-02-14 8:52 ` Lukas Wunner
2022-02-14 10:56 ` Mika Westerberg
2022-02-14 11:08 ` Mika Westerberg
2022-02-14 11:11 ` Mika Westerberg [this message]
2022-02-17 20:40 ` Bjorn Helgaas
2022-02-11 19:32 ` [PATCH v3 06/12] PCI: Explicitly mark USB4 NHI devices as removable Mario Limonciello
2022-02-11 21:58 ` Bjorn Helgaas
2022-02-11 19:32 ` [PATCH v3 07/12] PCI: Set ports for discrete USB4 controllers appropriately Mario Limonciello
2022-02-11 22:10 ` Bjorn Helgaas
2022-02-11 19:32 ` [PATCH v3 08/12] drm/amd: drop the use of `pci_is_thunderbolt_attached` Mario Limonciello
2022-02-11 19:32 ` [PATCH v3 09/12] drm/nouveau: " Mario Limonciello
2022-02-11 19:32 ` [PATCH v3 10/12] drm/radeon: " Mario Limonciello
2022-02-11 19:32 ` [PATCH v3 11/12] platform/x86: amd-gmux: " Mario Limonciello
2022-02-11 19:32 ` [PATCH v3 12/12] PCI: drop `pci_is_thunderbolt_attached` Mario Limonciello
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