[Intel-gfx] [PATCH] drm/i915: Spin until breadcrumb threads are complete

[Chris Wilson]

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 at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 drivers/gpu/drm/i915/i915_gem_request.c  |  5 ++---
 drivers/gpu/drm/i915/intel_breadcrumbs.c | 31 ++++++++++++-------------------
 drivers/gpu/drm/i915/intel_ringbuffer.h  |  3 +--
 3 files changed, 15 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index d866069c1767..6c71637d4be1 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -319,9 +319,8 @@ static int i915_gem_init_global_seqno(struct drm_i915_private *i915, u32 seqno)
 
 	/* If the seqno wraps around, we need to clear the breadcrumb rbtree */
 	if (!i915_seqno_passed(seqno, atomic_read(&timeline->next_seqno))) {
-		while (intel_kick_waiters(i915) || intel_kick_signalers(i915))
-			yield();
-		yield();
+		while (intel_breadcrumbs_busy(i915))
+			cond_resched(); /* spin until threads are complete */
 	}
 	atomic_set(&timeline->next_seqno, seqno);
 
diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c
index c410d3d6465f..c9c46a538edb 100644
--- a/drivers/gpu/drm/i915/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c
@@ -629,35 +629,28 @@ void intel_engine_fini_breadcrumbs(struct intel_engine_cs *engine)
 	cancel_fake_irq(engine);
 }
 
-unsigned int intel_kick_waiters(struct drm_i915_private *i915)
+unsigned int intel_breadcrumbs_busy(struct drm_i915_private *i915)
 {
 	struct intel_engine_cs *engine;
 	enum intel_engine_id id;
 	unsigned int mask = 0;
 
-	/* To avoid the task_struct disappearing beneath us as we wake up
-	 * the process, we must first inspect the task_struct->state under the
-	 * RCU lock, i.e. as we call wake_up_process() we must be holding the
-	 * rcu_read_lock().
-	 */
-	for_each_engine(engine, i915, id)
-		if (unlikely(intel_engine_wakeup(engine)))
-			mask |= intel_engine_flag(engine);
+	for_each_engine(engine, i915, id) {
+		struct intel_breadcrumbs *b = &engine->breadcrumbs;
 
-	return mask;
-}
+		spin_lock_irq(&b->lock);
 
-unsigned int intel_kick_signalers(struct drm_i915_private *i915)
-{
-	struct intel_engine_cs *engine;
-	enum intel_engine_id id;
-	unsigned int mask = 0;
+		if (b->first_wait) {
+			wake_up_process(b->first_wait->tsk);
+			mask |= intel_engine_flag(engine);
+		}
 
-	for_each_engine(engine, i915, id) {
-		if (unlikely(READ_ONCE(engine->breadcrumbs.first_signal))) {
-			wake_up_process(engine->breadcrumbs.signaler);
+		if (b->first_signal) {
+			wake_up_process(b->signaler);
 			mask |= intel_engine_flag(engine);
 		}
+
+		spin_unlock_irq(&b->lock);
 	}
 
 	return mask;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index cbc148863a03..3466b4e77e7c 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -587,7 +587,6 @@ 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_ */
-- 
2.10.2