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drm/i915: Spin until breadcrumb threads are complete

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When we need to reset the global seqno on wraparound, we have to wait
until the current rbtrees are drained (or otherwise the next waiter will
be out of sequence). The current mechanism to kick and spin until
complete, may exit too early as it would break if the target thread was
currently running. Instead, we must wake up the threads, but keep
spinning until the trees have been deleted.

In order to appease Tvrtko, busy spin rather than yield().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161108143719.32215-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
This commit is contained in:
Chris Wilson
2016-11-08 14:37:19 +00:00
parent 677100ce15
commit 6a5d1db98e
3 changed files with 17 additions and 26 deletions
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3
drivers/gpu/drm/i915/intel_ringbuffer.h
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@@ -578,7 +578,6 @@ static inline bool intel_engine_wakeup(const struct intel_engine_cs *engine)
void intel_engine_reset_breadcrumbs(struct intel_engine_cs *engine);
void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine);
unsigned int intel_kick_waiters(struct drm_i915_private *i915);
unsigned int intel_kick_signalers(struct drm_i915_private *i915);
unsigned int intel_breadcrumbs_busy(struct drm_i915_private *i915);
#endif /* _INTEL_RINGBUFFER_H_ */