Xen dom0 "interrupt storm detected on "irq16:"; throttling interrupt source"

[Eggert, Lars]

I'll test Friday, thanks.

On 2015-5-13, at 16:52, Roger Pau Monné <roger.pau at citrix.com> wrote:
> 
> El 13/05/15 a les 15.48, Eggert, Lars ha escrit:
>> isci0: <Intel(R) C600 Series Chipset SAS Controller (SATA mode)> port 0x6000-0x60ff mem 0xde07c000-0xde07ffff,0xddc00000-0xddffffff irq 16 at device 0.0 on pci10
>> isci0: attempting to allocate 2 MSI-X vectors (2 supported)
>> isci: 1:000089 ISCI bus_alloc_resource failed
> 
> This device is sharing the same IRQ#16 with ehci0, and I have a feeling
> it's not properly setting up it's interrupt sources. First, FreeBSD
> Dom0 still doesn't support MSI-X (only MSI), but isci doesn't check the
> errors returned by pci_alloc_msix. I have a patch for FreeBSD which
> might solve it, however I don't have any similar box I can use to test
> it, would you mind giving it a spin?
> 
> Thanks, Roger.
> 
> ---
> diff --git a/sys/x86/xen/xen_msi.c b/sys/x86/xen/xen_msi.c
> index 0f678b1..181b956 100644
> --- a/sys/x86/xen/xen_msi.c
> +++ b/sys/x86/xen/xen_msi.c
> @@ -114,6 +114,7 @@ int
> xen_msix_alloc(device_t dev, int *irq)
> {
> 
> +	*irq = -1;
> 	return (ENXIO);
> }
> 
> 

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