[Intel-gfx] [PATCH] drm/i915: Prevent TLB error on first execution on SNB

[Chris Wilson]

Long ago I found that I was getting sporadic errors when booting SNB,
with the symptom being that the first batch died with IPEHR != *ACTHD,
typically caused by the TLB being invalid. These magically disappeared
if I held the forcewake during the entire ring initialisation sequence.
(It can probably be shortened to a short critical section, but the whole
initialisation is full of register writes and so we would be taking and
releasing forcewake almost continually, and so holding it over the
entire sequence will probably be a net win!)

Note some of the kernels I encounted the issue already had the deferred
forcewake release, so it is still relevant.

I know that there have been a few other reports with similar failure
conditions on SNB, I think such as
References: https://bugs.freedesktop.org/show_bug.cgi?id=80913

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_gem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 8d15c8110962..2426f6d9b5a5 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4868,6 +4868,7 @@ int i915_gem_init(struct drm_device *dev)
 		dev_priv->gt.stop_ring = intel_logical_ring_stop;
 	}
 
+	intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
 	ret = i915_gem_init_userptr(dev);
 	if (ret)
 		goto out_unlock;
@@ -4894,6 +4895,7 @@ int i915_gem_init(struct drm_device *dev)
 	}
 
 out_unlock:
+	intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
 	mutex_unlock(&dev->struct_mutex);
 
 	return ret;
-- 
2.1.4