linux-kernel - Re: [PATCH 2/2] Intel-IOMMU, intr-remap: source-id checking

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Date:	Thu, 07 May 2009 11:19:41 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	"Han, Weidong" <weidong.han@...el.com>
Cc:	"dwmw2@...radead.org" <dwmw2@...radead.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [PATCH 2/2] Intel-IOMMU, intr-remap: source-id checking

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,
suresh

> +
> +				path++;
> +				count--;
> +				bus = pdev->subordinate;
> +			}
> +
> +			if (pdev) { /* PCI discoverable IOAPIC*/
> +				ir_ioapic[ir_ioapic_num].bus =
> +					pdev->bus->number;
> +				ir_ioapic[ir_ioapic_num].devfn = pdev->devfn;
> +			} else { /* Not PCI discoverable IOAPIC */
> +				if (!bus)
> +					ir_ioapic[ir_ioapic_num].bus =
> +						scope->bus;
> +				else
> +					ir_ioapic[ir_ioapic_num].bus =
> +						bus->number;
> +				ir_ioapic[ir_ioapic_num].devfn =
> +					PCI_DEVFN(path->dev, path->fn);
> +			}
> +
>  			ir_ioapic[ir_ioapic_num].iommu = iommu;
>  			ir_ioapic[ir_ioapic_num].id = scope->enumeration_id;
>  			ir_ioapic_num++;


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