path: root/Documentation/Intel-IOMMU.txt
diff options
authorKeshavamurthy, Anil S <>2007-10-21 16:41:55 -0700
committerLinus Torvalds <>2007-10-22 08:13:19 -0700
commite820482cd2621dba60e403af1c54502daa54b220 (patch)
tree3498401c7154e14008ab80b2f0cbca539ce7ffbc /Documentation/Intel-IOMMU.txt
parent3460a6d9cef9ac2aa997da7eff7ff1c8291b361c (diff)
Intel IOMMU: Iommu Gfx workaround
When we fix all the opensource gfx drivers to use the DMA api's, at that time we can yank this config options out. [ Kconfig fixes] Signed-off-by: Anil S Keshavamurthy <> Cc: Andi Kleen <> Cc: Peter Zijlstra <> Cc: Muli Ben-Yehuda <> Cc: "Siddha, Suresh B" <> Cc: Arjan van de Ven <> Cc: Ashok Raj <> Cc: "David S. Miller" <> Cc: Christoph Lameter <> Cc: Greg KH <> Signed-off-by: Jan Engelhardt <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'Documentation/Intel-IOMMU.txt')
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/Intel-IOMMU.txt b/Documentation/Intel-IOMMU.txt
index aba7722c2935..c2321903aa09 100644
--- a/Documentation/Intel-IOMMU.txt
+++ b/Documentation/Intel-IOMMU.txt
@@ -57,6 +57,11 @@ Graphics Problems?
If you encounter issues with graphics devices, you can try adding
option intel_iommu=igfx_off to turn off the integrated graphics engine.
+If it happens to be a PCI device included in the INCLUDE_ALL Engine,
+then try enabling CONFIG_DMAR_GFX_WA to setup a 1-1 map. We hear
+graphics drivers may be in process of using DMA api's in the near
+future and at that time this option can be yanked out.
Some exceptions to IOVA
Interrupt ranges are not address translated, (0xfee00000 - 0xfeefffff).