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intel-iommu: Fix device-to-iommu mapping for PCI-PCI bridges.

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When the DMAR table identifies that a PCI-PCI bridge belongs to a given
IOMMU, that means that the bridge and all devices behind it should be
associated with the IOMMU. Not just the bridge itself.

This fixes the device_to_iommu() function accordingly.

(It's broken if you have the same PCI bus numbers in multiple domains,
but this function was always broken in that way; I'll be dealing with
that later).

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse 2009-04-04 00:39:25 +01:00
parent d0b03bd1c6
commit 924b6231ed
1 changed files with 6 additions and 1 deletions
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7
drivers/pci/intel-iommu.c
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@ -477,11 +477,16 @@ static struct intel_iommu *device_to_iommu(u8 bus, u8 devfn)
if (drhd->ignored)
continue;
for (i = 0; i < drhd->devices_cnt; i++)
for (i = 0; i < drhd->devices_cnt; i++) {
if (drhd->devices[i] &&
drhd->devices[i]->bus->number == bus &&
drhd->devices[i]->devfn == devfn)
return drhd->iommu;
if (drhd->devices[i]->subordinate &&
drhd->devices[i]->subordinate->number <= bus &&
drhd->devices[i]->subordinate->subordinate >= bus)
return drhd->iommu;
}
if (drhd->include_all)
return drhd->iommu;