agp/intel-agp: Clear entire GTT on startup

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Some BIOSes fail to initialise the GTT, which will cause DMA faults when
the IOMMU is enabled. We need to clear the whole thing to point at the
scratch page, not just the part that Linux is going to use.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
[anholt: Note that this may also help with stability in the presence of
driver bugs, by not drawing to memory we don't own]
Signed-off-by: Eric Anholt <eric@anholt.net>

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David Woodhouse 2009-12-02 11:00:05 +00:00 • committed by Eric Anholt

parent f2b115e69d

commit fc61901373

1 changed files with 6 additions and 1 deletions

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7

drivers/char/agp/intel-agp.c

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