* Han, Weidong <weidong....@intel.com> wrote:
> Siddha, Suresh B wrote:
> > On Wed, 2009-05-06 at 23:16 -0700, Han, Weidong wrote:
> >> @@ -634,6 +694,44 @@ static int ir_parse_ioapic_scope(struct
> >> acpi_dmar_header *header, " 0x%Lx\n",
> >> scope->enumeration_id, drhd->address);
> >>
> >> + bus = pci_find_bus(drhd->segment, scope->bus);
> >> + path = (struct acpi_dmar_pci_path *)(scope + 1); +
> >> count =
> >> (scope->length - + sizeof(struct
> >> acpi_dmar_device_scope))
> >> + / sizeof(struct acpi_dmar_pci_path);
> >> +
> >> + while (count) {
> >> + if (pdev)
> >> + pci_dev_put(pdev);
> >> +
> >> + if (!bus)
> >> + break;
> >> +
> >> + pdev = pci_get_slot(bus,
> >> + PCI_DEVFN(path->dev, path->fn));
> >> + if (!pdev)
> >> + break;
> >
> > ir_parse_ioapic_scope() happens very early in the boot. So, I
> > don't think we can do the pci related discovery here.
> >
>
> Thanks for your pointing it out. It should enable the source-id
> checking for io-apic's after the pci subsystem is up. I will
> change it.
Note, there's ways to do early PCI quirks too, check
arch/x86/kernel/early-quirks.c. It's done by reading the PCI
configuration space directly via a careful early-capable subset of
the PCI config space APIs.
But it's a method of last resort.
Ingo
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