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

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Message-ID: <20231106181818.GB18564@wunner.de>
Date:   Mon, 6 Nov 2023 19:18:18 +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 Mon, Nov 06, 2023 at 10:59:13AM -0600, Mario Limonciello wrote:
> On 11/5/2023 11:39, Lukas Wunner wrote:
> > 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.
> 
> I could really use some clarification which PCIe devices actually contain
> the Intel VSEC.
> 
> Is it in all 3 of those PCIe devices and not just the switch?

Yes, I've just double-checked Light Ridge, Cactus Ridge, Alpine Ridge.

Thanks,

Lukas