PCI: Add DMA alias quirk for Adaptec 3405

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The Adaptec 3405 is actually an Intel 80333 I/O processor where the exposed
device at 0e.0 is actually the address translation unit of the I/O
processor and a hidden, private device at 01.0 masters the DMA for the
device.  Create a fixed alias between the exposed and hidden devfn so we
can enable the IOMMU.

Scenarios like this are potentially likely for any device incorporating
this I/O processor, so this little bit of abstraction with the fixed alias
table should make future additions trivial.

Without this fix, booting a system with the Intel IOMMU enabled and an
Adaptec 3405 at 02:0e.0 results in a flood of errors like this:

  dmar: DRHD: handling fault status reg 3
  dmar: DMAR:[DMA Write] Request device [02:01.0] fault addr ffbff000
  DMAR:[fault reason 02] Present bit in context entry is clear

[bhelgaas: changelog, comment]
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Adaptec OEM Raid Solutions <aacraid@adaptec.com>

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Alex Williamson 2015-01-13 11:26:50 -07:00 • committed by Bjorn Helgaas

parent 6a3763d173

commit d3d2ab43dd

1 changed files with 38 additions and 0 deletions

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drivers/pci/quirks.c

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