On Tue, Mar 18, 2014 at 02:59:04PM +0200, Jani Nikula wrote: > From: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > > 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@xxxxxxxxxxxxxxxxxx> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> > Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> > > --- > > Daniel, is this the color you want? Yeah, colour looks shiny ;-) Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx> > > Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx> > --- > 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 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; > > -- > 1.7.9.5 > -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
