diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2014-03-18 14:50:50 +0200 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2014-03-19 10:05:38 +0200 |
| commit | 0f4706d2740f2a221cd502922b22e522009041d9 (patch) | |
| tree | fd0df0e726d1309558982b6f0ee7531cc560e46c | |
| parent | 825938307f812c7cbfe064c7884bd8bdb27c2144 (diff) | |
| download | lwn-0f4706d2740f2a221cd502922b22e522009041d9.tar.gz lwn-0f4706d2740f2a221cd502922b22e522009041d9.zip | |
drm/i915: Disable stolen memory when DMAR is active
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>
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_stolen.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c index d58b4e287e32..28d24caa49f3 100644 --- a/drivers/gpu/drm/i915/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c @@ -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; |