dom0 kernel fails to recognize DVD drive on piix controller

dom0 kernel fails to recognize DVD drive on piix controller

[Olaf Hering]

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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?

I'm attaching a collection of logfiles, like dmesg, lspci and the used
debug patch, along with the used .config for the dom0 kernel.

Thanks,

Olaf

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Re: dom0 kernel fails to recognize DVD drive on piix controller

[Jan Beulich]

>>> On 21.04.16 at 11:37, <olaf@aepfle.de> 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)?

Jan


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Re: dom0 kernel fails to recognize DVD drive on piix controller

[Olaf Hering]

On Thu, Apr 21, Jan Beulich wrote:

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

How do I find out?

Olaf

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Re: dom0 kernel fails to recognize DVD drive on piix controller

[Jan Beulich]

>>> On 21.04.16 at 11:52, <olaf@aepfle.de> wrote:
> On Thu, Apr 21, Jan Beulich wrote:
> 
>> Does the device actually use IRQ19, or does it instead use IRQ14
>> and IRQ15 (which then may require some special casing somewhere)?
> 
> How do I find out?

Check what the native kernel uses.

Jan


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Re: dom0 kernel fails to recognize DVD drive on piix controller

[Olaf Hering]

On Thu, Apr 21, Jan Beulich wrote:

> >>> On 21.04.16 at 11:52, <olaf@aepfle.de> wrote:
> > On Thu, Apr 21, Jan Beulich wrote:
> > 
> >> Does the device actually use IRQ19, or does it instead use IRQ14
> >> and IRQ15 (which then may require some special casing somewhere)?
> > 
> > How do I find out?
> 
> Check what the native kernel uses.

Yeah, silly question. Sorry.

Its indeed 14/15:
 14:        139        115   IO-APIC  14-edge      ata_piix
 15:          0          0   IO-APIC  15-edge      ata_piix

So does that special handling have to be done in Xen or in dom0?

Olaf

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Re: dom0 kernel fails to recognize DVD drive on piix controller

[Jan Beulich]

>>> On 21.04.16 at 12:35, <olaf@aepfle.de> wrote:
> On Thu, Apr 21, Jan Beulich wrote:
> 
>> >>> On 21.04.16 at 11:52, <olaf@aepfle.de> wrote:
>> > On Thu, Apr 21, Jan Beulich wrote:
>> > 
>> >> Does the device actually use IRQ19, or does it instead use IRQ14
>> >> and IRQ15 (which then may require some special casing somewhere)?
>> > 
>> > How do I find out?
>> 
>> Check what the native kernel uses.
> 
> Yeah, silly question. Sorry.
> 
> Its indeed 14/15:
>  14:        139        115   IO-APIC  14-edge      ata_piix
>  15:          0          0   IO-APIC  15-edge      ata_piix
> 
> So does that special handling have to be done in Xen or in dom0?

In Dom0 I would guess - Xen can't do anything about Dom0's
understanding of interrupts, and from the looks of it Dom0 only
sets up IRQ19 here, ignoring the two legacy interrupts.

Jan


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Re: dom0 kernel fails to recognize DVD drive on piix controller

[Juergen Gross]

On 21/04/16 11:37, Olaf Hering 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?

You might want to test Stefano's patch trying to fix a similar issue:

http://lists.xen.org/archives/html/xen-devel/2016-04/msg02512.html


Juergen

> 
> I'm attaching a collection of logfiles, like dmesg, lspci and the used
> debug patch, along with the used .config for the dom0 kernel.
> 
> Thanks,
> 
> Olaf
> 
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
> 


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Re: dom0 kernel fails to recognize DVD drive on piix controller

[Olaf Hering]

On Thu, Apr 21, Juergen Gross wrote:

> http://lists.xen.org/archives/html/xen-devel/2016-04/msg02512.html

Thanks, this helps.

Olaf

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