pci_alloc_irq_vectors fails ENOSPC for XPS 13 9310

[Kalle Valo]

Thomas Gleixner <tglx at 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.

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches