Re: [Xen-devel] nr_irqs_gsi

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Jul 11, 2012 at 10:42:10AM +0100, Andrew Cooper wrote:
> 
> On 11/07/12 04:31, Joe Jin wrote:
> > Hi,
> >
> > IHAC whose server have 12 NICs, but when bring up found the 12 NIC not be
> > enabled, I found below from xm-dmesg
> > (XEN) physdev.c:122: dom0: map invalid irq 55
> >
> > The corresponding codes:
> >
> > 115     /* Verify or get irq. */
> > 116     switch ( map->type )
> > 117     {
> > 118     case MAP_PIRQ_TYPE_GSI:
> > 119         if ( map->index < 0 || map->index >= nr_irqs_gsi )
> > 120         {
> > 121             dprintk(XENLOG_G_ERR, "dom%d: map invalid irq %d\n",
> > 122                     d->domain_id, map->index);
> > 123             ret = -EINVAL;
> > 124             goto free_domain;
> > 125         }
> > 126 
> >
> > Log all info to xm-dmesg I got:
> > (XEN) ACPI: IOAPIC (id[0x00] address[0xfec00000] gsi_base[0])
> > (XEN) IOAPIC[0]: apic_id 0, version 32, address 0xfec00000, GSI 0-23
> > (XEN) ACPI: IOAPIC (id[0x01] address[0xfec80000] gsi_base[32])
> > (XEN) IOAPIC[1]: apic_id 1, version 32, address 0xfec80000, GSI 32-55
> > (XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
> > (XEN) ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
> > (XEN) ACPI: IRQ0 used by override.
> > (XEN) ACPI: IRQ2 used by override.
> > (XEN) ACPI: IRQ9 used by override.
> > (XEN) Enabling APIC mode:  Phys.  Using 2 I/O APICs
> > (XEN) ACPI: HPET id: 0x8086a301 base: 0xfed00000
> > (XEN) PCI: MCFG configuration 0: base e0000000 segment 0 buses 0 - 255
> > (XEN) PCI: MCFG area at e0000000 reserved in E820
> > (XEN) ERST table is invalid
> > (XEN) Using ACPI (MADT) for SMP configuration information
> > (XEN) IRQ limits: 55 GSI, 3033 MSI/MSI-X
> > (XEN) Using scheduler: SMP Credit Scheduler (credit)
> >
> > nr_irqs_gsi = 55, 
> > So the condition of #119 should be (map->index > nr_irqs_gsi)?
> > for GSI irq 55 should be available as well?
> >
> > Thanks,
> > Joe
> 
> No.  There are 55 GSIs, indexed 0 thru 54.  You would be introducing an
> off-by-one error by changing the condition.
> 
> The more interesting question is why you are attempting to map more GSIs
> than you actually have.

Could it be the ACPI DSDT _PRT being confused. Joe, what does dom0
print out for:

xen: registering gsi ...

for the devices? (maybe all to see if there is a trend?)
arch/x86/pci/xen.c to print out the 
> 
> ~Andrew
> 
> >
> > _______________________________________________
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> > Xen-devel@xxxxxxxxxxxxx
> > http://lists.xen.org/xen-devel
> 
> -- 
> Andrew Cooper - Dom0 Kernel Engineer, Citrix XenServer
> T: +44 (0)1223 225 900, http://www.citrix.com
> 
> 
> 
> 
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