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x86_64: Calgary - Fix mis-handled PCI topology

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Current code assumed that devices were directly connected to a Calgary
bridge, as it tried to get the iommu table directly from the parent bus
controller.

When we have another bridge between the Calgary/CalIOC2 bridge and the
device we should look upwards until we get to the top (Calgary/CalIOC2
bridge), where the iommu table resides.

Signed-off-by: Murillo Fernandes Bernardes <mfb@br.ibm.com>
Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Murillo Fernandes Bernardes 2007-08-10 22:31:00 +02:00 committed by Linus Torvalds
parent 3320ad994a
commit f055a0619a
1 changed files with 6 additions and 7 deletions
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11
arch/x86_64/kernel/pci-calgary.c
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@ -367,16 +367,15 @@ static inline struct iommu_table *find_iommu_table(struct device *dev)
pdev = to_pci_dev(dev);
/* is the device behind a bridge? */
if (unlikely(pdev->bus->parent))
pbus = pdev->bus->parent;
else
pbus = pdev->bus;
/* is the device behind a bridge? Look for the root bus */
while (pbus->parent)
pbus = pbus->parent;
tbl = pci_iommu(pbus);
BUG_ON(pdev->bus->parent &&
(tbl->it_busno != pdev->bus->parent->number));
BUG_ON(tbl && (tbl->it_busno != pbus->number));
return tbl;
}