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3970564940
If the user is racing a call to debugfs/i915_drop_caches with ongoing submission from another thread/process, we may never end up idling the GPU and be uninterruptibly spinning in debugfs/i915_drop_caches trying to catch an idle moment. Just flush the work once, that should be enough to park the system under correct conditions. Outside of those we either have a driver bug or the user is racing themselves. Sadly, because the user may be provoking the unwanted situation we can't put a warn here to attract attention to a probable bug. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190507121108.18377-4-chris@chris-wilson.co.uk |
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