linux-kernel - Re: [PATCH v2 6/9] PCI: Rename is_thunderbolt to is

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Message-ID: <20231105173946.GA31955@wunner.de>
Date:   Sun, 5 Nov 2023 18:39:46 +0100
From:   Lukas Wunner <lukas@...ner.de>
To:     Mario Limonciello <mario.limonciello@....com>
Cc:     Karol Herbst <kherbst@...hat.com>, Lyude Paul <lyude@...hat.com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Danilo Krummrich <dakr@...hat.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Xinhui Pan <Xinhui.Pan@....com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Mark Gross <markgross@...nel.org>,
        Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        Pali Rohár <pali@...nel.org>,
        Marek Behún <kabel@...nel.org>,
        "Maciej W . Rozycki" <macro@...am.me.uk>,
        Manivannan Sadhasivam <mani@...nel.org>,
        "open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS" 
        <dri-devel@...ts.freedesktop.org>,
        "open list:DRM DRIVER FOR NVIDIA GEFORCE/QUADRO GPUS" 
        <nouveau@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:RADEON and AMDGPU DRM DRIVERS" 
        <amd-gfx@...ts.freedesktop.org>,
        "open list:PCI SUBSYSTEM" <linux-pci@...r.kernel.org>,
        "open list:ACPI" <linux-acpi@...r.kernel.org>,
        "open list:X86 PLATFORM DRIVERS" 
        <platform-driver-x86@...r.kernel.org>,
        "open list:THUNDERBOLT DRIVER" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v2 6/9] PCI: Rename is_thunderbolt to is_tunneled

On Fri, Nov 03, 2023 at 02:07:55PM -0500, Mario Limonciello wrote:
> The `is_thunderbolt` bit has been used to indicate that a PCIe device
> contained the Intel VSEC which is used by various parts of the kernel
> to change behavior. To later allow usage with USB4 controllers as well,
> rename this to `is_tunneled`.

This doesn't seem to make sense.  is_thunderbolt indicates that a device
is part of a Thunderbolt controller.  See the code comment:

> -	unsigned int	is_thunderbolt:1;	/* Thunderbolt controller */

A Thunderbolt controller is not necessarily tunneled.  The PCIe switch,
NHI and XHCI of the Thunderbolt host controller are not tunneled at all.

Thanks,

Lukas