After the ILK vt-d workaround patches it became clear that we had introduced a bug. Chris Wilson tracked down the issue to recursive calls to unmap. This happens because we try to optimize waiting on requests by calling retire requests after the wait, which may drop the last reference on an object and end up freeing the object (and then unmap the object from the gtt). After the last patch we can now choose to defer processing the retire list. Kudos to Chris Wilson for tracking this one down. This patch fixes gem_unref_active_buffers from i-g-t. It was tested by forcing do_idle_maps to true. This also fixes tests/gem_linear_blits in intel-gpu-tools. Reported-by: guang.a.yang at intel.com Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=42180 Reviewed-by: Keith Packard <keithp at keithp.com> Signed-off-by: Ben Widawsky <ben at bwidawsk.net> --- drivers/gpu/drm/i915/i915_gem_gtt.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index e050b90..11bddd5 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -55,7 +55,7 @@ static bool do_idling(struct drm_i915_private *dev_priv) if (unlikely(dev_priv->mm.gtt->do_idle_maps)) { dev_priv->mm.interruptible = false; - if (i915_gpu_idle(dev_priv->dev, true)) { + if (i915_gpu_idle(dev_priv->dev, false)) { DRM_ERROR("Couldn't idle GPU\n"); /* Wait a bit, in hopes it avoids the hang */ udelay(10); -- 1.7.8.4
