From c0a7f818997f58b2c184a3ff313c170c411b88b4 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Mon, 30 Dec 2013 12:16:15 +0000 Subject: [PATCH] drm/i915: Mention when we enable the Ironlake iommu workarounds The iommu and gfx on Ironlake do not like each other and require a big hammer to prevent hard machine hangs. In commit 5c0422878fcdc279ae9a8e8b66972a15b5efb67f Author: Ben Widawsky Date: Mon Oct 17 15:51:55 2011 -0700 drm/i915: ILK + VT-d workaround we added the workaround, but never emitted any debug message that it was active. Doing so should help identify known performance regressions. Signed-off-by: Chris Wilson Reviewed-by: Ben Widawsky Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_gem_gtt.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 056f1f0e2772..9e07a864dec0 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -1438,6 +1438,9 @@ static int i915_gmch_probe(struct drm_device *dev, dev_priv->gtt.base.clear_range = i915_ggtt_clear_range; dev_priv->gtt.base.insert_entries = i915_ggtt_insert_entries; + if (unlikely(dev_priv->gtt.do_idle_maps)) + DRM_INFO("applying Ironlake quirks for intel_iommu\n"); + return 0; } -- 2.20.1