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From:   Kalle Valo <kvalo@codeaurora.org>
To:     Thomas Gleixner <tglx@linutronix.de>
Cc:     Thomas Krause <thomaskrause@posteo.de>,
        Bjorn Helgaas <helgaas@kernel.org>,
        Govind Singh <govinds@codeaurora.org>,
        linux-pci@vger.kernel.org, linux-wireless@vger.kernel.org,
        Devin Bayer <dev@doubly.so>, ath11k@lists.infradead.org,
        Christoph Hellwig <hch@lst.de>,
        David Woodhouse <dwmw@amazon.co.uk>
Subject: Re: pci_alloc_irq_vectors fails ENOSPC for XPS 13 9310
References: <20201103160838.GA246433@bjorn-Precision-5520>
        <874km61732.fsf@nanos.tec.linutronix.de>
        <fa26ac8b-ed48-7ea3-c21b-b133532716b8@posteo.de>
        <87mtzxkus5.fsf@nanos.tec.linutronix.de>
Date:   Thu, 05 Nov 2020 15:23:03 +0200
In-Reply-To: <87mtzxkus5.fsf@nanos.tec.linutronix.de> (Thomas Gleixner's
        message of "Wed, 04 Nov 2020 16:26:34 +0100")
Message-ID: <87wnz0hr9k.fsf@codeaurora.org>
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Thomas Gleixner <tglx@linutronix.de> writes:

> On Wed, Nov 04 2020 at 14:04, Thomas Krause wrote:
>> config) but CONFIG_INTEL_IOMMU_DEFAULT_ON needed to be set manually. I 
>> hope this helps, if there is more I can do to debug it on my side I'm 
>> happy to do so.
>
>> [    0.050130] DMAR: [Firmware Bug]: Your BIOS is broken; DMAR reported at address 0!
>>                BIOS vendor: Dell Inc.; Ver: 1.1.1; Product Version:
>
>> [    0.103693] DMAR: Host address width 39
>> [    0.103693] DMAR: DRHD base: 0x000000fed90000 flags: 0x0
>> [    0.103697] DMAR: dmar0: reg_base_addr fed90000 ver 4:0 cap 1c0000c40660462 ecap 69e2ff0505e
>> [    0.103698] DMAR: DRHD base: 0x000000fed84000 flags: 0x0
>> [    0.103701] DMAR: dmar1: reg_base_addr fed84000 ver 1:0 cap d2008c40660462 ecap f050da
>> [    0.103702] DMAR: DRHD base: 0x000000fed86000 flags: 0x0
>> [    0.103706] DMAR: dmar2: reg_base_addr fed86000 ver 1:0 cap d2008c40660462 ecap f050da
>> [    0.103707] DMAR: DRHD base: 0x00000000000000 flags: 0x1
>> [    0.103707] DMAR: Parse DMAR table failure.
>
> which disables interrupt remapping and therefore the driver gets only
> one MSI which makes it unhappy.
>
> Not that I'm surprised, it's Dell.... Can you check whether they have a
> BIOS update for that box?

I was told that on Dell XPS 15 (with a working QCA6390 setup) there's a
separate "Virtualisation" setting in BIOS. See if you have that and try
enabling it.

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