diff options
| author | Jiang Liu <jiang.liu@linux.intel.com> | 2014-04-15 06:35:35 +0400 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2014-04-15 09:11:58 +0400 |
| commit | 5ae0566a0fffa09a77ac5996e3854fe91cd87167 (patch) | |
| tree | b1a06359a5807a73d10ee25fdf162752a54641ac /drivers/iommu/dmar.c | |
| parent | 9f05d3fb644bf178c169d9c70dcfe360e3a006ae (diff) | |
| download | linux-5ae0566a0fffa09a77ac5996e3854fe91cd87167.tar.xz | |
iommu/vt-d: fix bug in matching PCI devices with DRHD/RMRR descriptors
Commit "59ce0515cdaf iommu/vt-d: Update DRHD/RMRR/ATSR device scope
caches when PCI hotplug happens" introduces a bug, which fails to
match PCI devices with DMAR device scope entries if PCI path array
in the entry has more than one level.
For example, it fails to handle
[1D2h 0466 1] Device Scope Entry Type : 01
[1D3h 0467 1] Entry Length : 0A
[1D4h 0468 2] Reserved : 0000
[1D6h 0470 1] Enumeration ID : 00
[1D7h 0471 1] PCI Bus Number : 00
[1D8h 0472 2] PCI Path : 1C,04
[1DAh 0474 2] PCI Path : 00,02
And cause DMA failure on HP DL980 as:
DMAR:[fault reason 02] Present bit in context entry is clear
dmar: DRHD: handling fault status reg 602
dmar: DMAR:[DMA Read] Request device [02:00.2] fault addr 7f61e000
Reported-and-tested-by: Davidlohr Bueso <davidlohr@hp.com>
Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/iommu/dmar.c')
| -rw-r--r-- | drivers/iommu/dmar.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index f445c10df8df..39f8b717fe84 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -152,7 +152,8 @@ dmar_alloc_pci_notify_info(struct pci_dev *dev, unsigned long event) info->seg = pci_domain_nr(dev->bus); info->level = level; if (event == BUS_NOTIFY_ADD_DEVICE) { - for (tmp = dev, level--; tmp; tmp = tmp->bus->self) { + for (tmp = dev; tmp; tmp = tmp->bus->self) { + level--; info->path[level].device = PCI_SLOT(tmp->devfn); info->path[level].function = PCI_FUNC(tmp->devfn); if (pci_is_root_bus(tmp->bus)) |