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Intel IOMMU: Intel iommu cmdline option - forcedac

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Introduce intel_iommu=forcedac commandline option.  This option is helpful to
verify the pci device capability of handling physical dma'able address greater
than 4G.

Signed-off-by: Anil S Keshavamurthy <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Muli Ben-Yehuda <[email protected]>
Cc: "Siddha, Suresh B" <[email protected]>
Cc: Arjan van de Ven <[email protected]>
Cc: Ashok Raj <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Greg KH <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Keshavamurthy, Anil S 2007-10-21 16:41:53 -07:00 • committed by Linus Torvalds
commit 7d3b03ce7b
2 changed files with 13 additions and 1 deletions
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7
Documentation/kernel-parameters.txt
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@ -781,6 +781,13 @@ and is between 256 and 4096 characters. It is defined in the file
bypassed by not enabling DMAR with this option. In
this case, gfx device will use physical address for
DMA.
forcedac [x86_64]
With this option iommu will not optimize to look
for io virtual address below 32 bit forcing dual
address cycle on pci bus for cards supporting greater
than 32 bit addressing. The default is to look
for translation below 32 bit and if not available
then look in the higher range.
io7= [HW] IO7 for Marvel based alpha systems
See comment before marvel_specify_io7 in