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authorDavid Woodhouse <David.Woodhouse@intel.com>2010-06-15 10:57:57 +0100
committerDavid Woodhouse <David.Woodhouse@intel.com>2010-06-15 10:57:57 +0100
commit2d9e667efdfb4e986074d98e7d9a424003c7c43b (patch)
treea3436795620225e16c676882caf6822e219b98b6 /net/wanrouter/wanproc.c
parent00dfff77e7184140dc45724c7232e99302f6bf97 (diff)
intel-iommu: Force-disable IOMMU for iGFX on broken Cantiga revisions.
Certain revisions of this chipset appear to be broken. There is a shadow GTT which mirrors the real GTT but contains pre-translated physical addresses, for performance reasons. When a GTT update happens, the translations are done once and the resulting physical addresses written back to the shadow GTT. Except sometimes, the physical address is actually written back to the _real_ GTT, not the shadow GTT. Thus we start to see faults when that physical address is fed through translation again. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'net/wanrouter/wanproc.c')
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