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. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=68535 Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx> --- drivers/gpu/drm/i915/i915_gem_stolen.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c index 984ada1b0084..13a849afe479 100644 --- a/drivers/gpu/drm/i915/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/i915_gem_stolen.c @@ -325,11 +325,25 @@ void i915_gem_cleanup_stolen(struct drm_device *dev) drm_mm_takedown(&dev_priv->mm.stolen); } +static bool need_dmar_wa(struct drm_device *dev) +{ +#ifdef CONFIG_INTEL_IOMMU + if (INTEL_INFO(dev)->gen >= 6 && intel_iommu_gfx_mapped) + return true; +#endif + return false; +} + int i915_gem_init_stolen(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; struct resource *r; + if (need_dmar_wa(dev)) { + DRM_INFO("DMAR active, disabling use of stolen memory\n"); + return 0; + } + if (dev_priv->gtt.stolen_size == 0) return 0; -- 1.9.0 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
