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drm/i915: Disable stolen memory when DMAR is active

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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.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=68535
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: stable@vger.kernel.org
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Chris Wilson 2014-03-18 14:50:50 +02:00 committed by Jani Nikula
parent 825938307f
commit 0f4706d274
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/i915/i915_gem_stolen.c
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@ -214,6 +214,13 @@ int i915_gem_init_stolen(struct drm_device *dev)
struct drm_i915_private *dev_priv = dev->dev_private;
int bios_reserved = 0;
#ifdef CONFIG_INTEL_IOMMU
if (intel_iommu_gfx_mapped) {
DRM_INFO("DMAR active, disabling use of stolen memory\n");
return 0;
}
#endif
if (dev_priv->gtt.stolen_size == 0)
return 0;