[Xen-devel] Re: MSI error when reloading iwlagn module

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.09.11 at 21:57, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:
> Hi,
> 
> With a fairly current kernel + xen, I'm seeing this if I rmmod iwlagn
> and try to reload it:
> 
> [51230.646678] Intel(R) Wireless WiFi Link AGN driver for Linux, in-tree:
> [51230.646685] Copyright(c) 2003-2011 Intel Corporation
> [51230.646760] xen: registering gsi 17 triggering 0 polarity 1
> [51230.646773] xen_map_pirq_gsi: returning irq 17 for gsi 17
> [51230.646777] xen: --> pirq=17 -> irq=17 (gsi=17)
> [51230.646781] Already setup the GSI :17
> [51230.646789] iwlagn 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
> [51230.646814] iwlagn 0000:03:00.0: setting latency timer to 64
> [51230.646935] iwlagn 0000:03:00.0: pci_resource_len = 0x00002000
> [51230.646941] iwlagn 0000:03:00.0: pci_resource_base = ffffc9000671c000
> [51230.646945] iwlagn 0000:03:00.0: HW Revision ID = 0x35
> [51230.647075] iwlagn 0000:03:00.0: xen map irq failed -22 for 32752 domain
> [51230.647081] iwlagn 0000:03:00.0: pci_enable_msi failed
> [51230.647113] iwlagn 0000:03:00.0: PCI INT A disabled
> [51230.647126] iwlagn: probe of 0000:03:00.0 failed with error -22
> 
> with this on the Xen console
> 
> (XEN) physdev.c:139: dom0: can't create irq for msi!
> 
> 
> I'm running Xen as of a422e2a4451e, which your MSI changes in them,
> which I suspect of having caused a regression (since I don't remember
> having problems reloading msi-using drivers before).

Are you certain (i.e. did you try reverting the top 1 to 3 commits from
there)? Alternatively, do you know what c/s last worked for you? Is
this one the first removal, or after several of them?

The message solely indicates a failure of create_irq(), with either
find_unassigned_irq() or __assign_irq_vector() failing being the cause,
none of which I touched recently. Instead I wonder whether
23812:32814ad7458d wouldn't be a more likely candidate (with
23815:9fa77d26a813 and 23816:7f357e1ef60a being less likely ones).

I'll nevertheless see whether this reproduces with one of the MSI
drivers that my machines have in use and allow easy removal/reload.

Jan


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