From: David Woodhouse Date: Fri, 3 Apr 2009 23:39:25 +0000 (+0100) Subject: intel-iommu: Fix device-to-iommu mapping for PCI-PCI bridges. X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=924b6231edfaf1e764ffb4f97ea382bf4facff58;p=linux-beck.git intel-iommu: Fix device-to-iommu mapping for PCI-PCI bridges. 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 --- diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index f3eebd2b2d72..6262c198e56e 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -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;