[Intel-gfx] [PATCH v2 for -fixes] drm/i915: Disable stolen memory when DMAR is active

[David Woodhouse]

On Tue, 2014-03-18 at 14:59 +0200, Jani Nikula wrote:
> From: Chris Wilson <chris at chris-wilson.co.uk>
> 
> We have reports of heavy screen corruption if we try to use the stolen
> memory reserved by the BIOS whilst the DMA-Remapper is active. This
> quirk may be only specific to a few machines or BIOSes, but first lets
> apply the big hammer and always disable use of stolen memory when DMAR
> is active.
> 
> v2 by Jani: Rebase on -fixes, only look at intel_iommu_gfx_mapped.

Perhaps this (and all similar workarounds) should be predicated on
i915_preliminary_hw_support? When people are using the Linux kernel for
chipset validation, we sure as hell don't want to silently disable this
stuff and let them think it's working when it's not.

-- 
dwmw2

-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/x-pkcs7-signature
Size: 5745 bytes
Desc: not available
URL: <http://lists.freedesktop.org/archives/intel-gfx/attachments/20140319/bf8ae6d5/attachment.bin>