linux-kernel - RE: [PATCH 1/4] PCI / ACPI: Identify external PCI devices

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Date:   Thu, 15 Nov 2018 19:33:54 +0000
From:   <Mario.Limonciello@...l.com>
To:     <mika.westerberg@...ux.intel.com>, <lorenzo.pieralisi@....com>
CC:     <lukas@...ner.de>, <iommu@...ts.linux-foundation.org>,
        <joro@...tes.org>, <dwmw2@...radead.org>,
        <baolu.lu@...ux.intel.com>, <ashok.raj@...el.com>,
        <bhelgaas@...gle.com>, <rjw@...ysocki.net>,
        <jacob.jun.pan@...el.com>, <andreas.noever@...il.com>,
        <michael.jamet@...el.com>, <YehezkelShB@...il.com>,
        <ckellner@...hat.com>, <anthony.wong@...onical.com>,
        <linux-acpi@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/4] PCI / ACPI: Identify external PCI devices



> -----Original Message-----
> From: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Sent: Thursday, November 15, 2018 1:01 PM
> To: Lorenzo Pieralisi
> Cc: Lukas Wunner; iommu@...ts.linux-foundation.org; Joerg Roedel; David
> Woodhouse; Lu Baolu; Ashok Raj; Bjorn Helgaas; Rafael J. Wysocki; Jacob jun Pan;
> Andreas Noever; Michael Jamet; Yehezkel Bernat; Christian Kellner; Limonciello,
> Mario; Anthony Wong; linux-acpi@...r.kernel.org; linux-pci@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH 1/4] PCI / ACPI: Identify external PCI devices
> 
> 
> [EXTERNAL EMAIL]
> 
> On Thu, Nov 15, 2018 at 05:46:08PM +0000, Lorenzo Pieralisi wrote:
> > Do you really need to parse it if the dev->is_thunderbolt check is enough ?
> 
> Yes, we need to parse it one way or another. dev->is_thunderbolt is
> based on heuristics which do not apply anymore when the thing gets
> integrated in the SoC.
> 
> The _DSD is there already (on existing systems) and is being used by
> Windows so I don't understand why we cannot take advantage of it? Every
> new system with Thunderbolt ports will have it.

Furthermore it's entirely in the BIOS writers best interest to do this correctly
as it applies proper policy on Windows as well.

I wouldn't be surprised if WHCK failed if it was done wrong.