| Message ID | 1388405775-25800-1-git-send-email-chris@chris-wilson.co.uk (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Dec 30, 2013 at 12:16:15PM +0000, Chris Wilson wrote: > 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 <ben@bwidawsk.net> > 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 <chris@chris-wilson.co.uk> Reviewed-by: Ben Widawsky <ben@bwidawsk.net> [snip]
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index 998f9a0b322a..2adfef0fa6ac 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -1727,6 +1727,9 @@ static int i915_gmch_probe(struct drm_device *dev, dev_priv->gtt.do_idle_maps = needs_idle_maps(dev_priv->dev); dev_priv->gtt.base.clear_range = i915_ggtt_clear_range; + if (unlikely(dev_priv->gtt.do_idle_maps)) + DRM_INFO("applying Ironlake quirks for intel_iommu\n"); + return 0; }
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 <ben@bwidawsk.net> 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 <chris@chris-wilson.co.uk> --- drivers/gpu/drm/i915/i915_gem_gtt.c | 3 +++ 1 file changed, 3 insertions(+)