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| author |   Ville Syrjälä <ville.syrjala@linux.intel.com> | 2020-10-15 13:21:35 +0100 |
|---|---|---|
| committer |   Chris Wilson <chris@chris-wilson.co.uk> | 2020-10-15 15:38:19 +0100 |
| commit | d46b60a2e8d246f1f0faa38e52f4f5a73858c338 (patch) | |
| tree | a5b73c3b14544544dbb6aea89dd257a93d5697ea /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | drm/i915/gt: Initialize reserved and unspecified MOCS indices (diff) | |
| download | wireguard-linux-d46b60a2e8d246f1f0faa38e52f4f5a73858c338.tar.xz wireguard-linux-d46b60a2e8d246f1f0faa38e52f4f5a73858c338.zip | |
drm/i915: Mark ininitial fb obj as WT on eLLC machines to avoid rcu lockup during fbdev init
Currently we leave the cache_level of the initial fb obj
set to NONE. This means on eLLC machines the first pin_to_display()
will try to switch it to WT which requires a vma unbind+bind.
If that happens during the fbdev initialization rcu does not
seem operational which causes the unbind to get stuck. To
most appearances this looks like a dead machine on boot.
Avoid the unbind by already marking the object cache_level
as WT when creating it. We still do an excplicit ggtt pin
which will rewrite the PTEs anyway, so they will match whatever
cache level we set.
Cc: <stable@vger.kernel.org> # v5.7+
Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2381
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20201007120329.17076-1-ville.syrjala@linux.intel.com
Link: https://patchwork.freedesktop.org/patch/msgid/20201015122138.30161-1-chris@chris-wilson.co.uk
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