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authorKeshavamurthy, Anil S <anil.s.keshavamurthy@intel.com>2007-10-21 16:41:53 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-22 08:13:18 -0700
commit7d3b03ce7bff9d39ebaee1bb8de1968c4434b883 (patch)
tree0016214c96d2475a160efdd85539242e356ce2d9 /Documentation
parenteb3fa7cb51a2a35cd95eb92e65d8039c779468a5 (diff)
Intel IOMMU: Intel iommu cmdline option - forcedac
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 <anil.s.keshavamurthy@intel.com> Cc: Andi Kleen <ak@suse.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Muli Ben-Yehuda <muli@il.ibm.com> Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com> Cc: Arjan van de Ven <arjan@infradead.org> Cc: Ashok Raj <ashok.raj@intel.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Christoph Lameter <clameter@sgi.com> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/kernel-parameters.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 8157417724a8..b2361667839f 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -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