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Re: [Xen-devel] dom0 kernel fails to recognize DVD drive on piix controller

>>> On 21.04.16 at 11:37, <olaf@xxxxxxxxx> wrote:
> On my Fujitsu Esprimo Mobile M9400 laptop the upstream dom0 kernel does
> not find the DVD drive. The DVD drive is found with native kernels and
> also with xenlinux based kernels, like 4.1 based openSUSE Leap.
> [    6.242286] ata_piix 0000:00:1f.1: version 2.13
> [    6.242625] xen: registering gsi 19 triggering 0 polarity 1
> [    6.242635] Already setup the GSI :19
> [    6.250792] ata_piix: probe of 0000:00:1f.1 failed with error -22
> After some investigation it turned out that irq_to_desc() returns
> nothing for the piix PCI device, as a result EINVAL is returned.
> The callchain is like:
>  piix_init_one
>   ata_pci_sff_activate_host (legacy_mode case)
>    devm_request_threaded_irq
>     irq_to_desc
> This happens with 4.4, 4.5 and 4.6 based dom0 kernels.
> Any idea whats happening here, where to look further?

Does the device actually use IRQ19, or does it instead use IRQ14
and IRQ15 (which then may require some special casing somewhere)?


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