| From | Kamal Mostafa <> | Subject | [PATCH 3.8 76/86] drm/i915: Disable stolen memory when DMAR is active | Date | Tue, 1 Apr 2014 09:08:29 -0700 |
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3.8.13.21 -stable review patch. If anyone has any objections, please let me know.
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From: Chris Wilson <chris@chris-wilson.co.uk>
commit 0f4706d2740f2a221cd502922b22e522009041d9 upstream.
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> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Kamal Mostafa <kamal@canonical.com> --- drivers/gpu/drm/i915/i915_gem_stolen.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c index be24312..af92fea 100644 --- a/drivers/gpu/drm/i915/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c @@ -174,6 +174,13 @@ int i915_gem_init_stolen(struct drm_device *dev) struct drm_i915_private *dev_priv = dev->dev_private; unsigned long prealloc_size = dev_priv->mm.gtt->stolen_size; +#ifdef CONFIG_INTEL_IOMMU + if (intel_iommu_gfx_mapped) { + DRM_INFO("DMAR active, disabling use of stolen memory\n"); + return 0; + } +#endif + dev_priv->mm.stolen_base = i915_stolen_to_physical(dev); if (dev_priv->mm.stolen_base == 0) return 0; -- 1.8.3.2
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