[PATCH 3/4] drm/i915/gt: Free stale request on destroying the virtual engine

[Chris Wilson]

Since preempt-to-busy, we may unsubmit a request while it is still on
the HW and completes asynchronously. That means it may be retired and in
the process destroy the virtual engine (as the user has closed their
context), but that engine may still be holding onto the unsubmitted
compelted request. Therefore we need to potentially cleanup the old
request on destroying the virtual engine. We also have to keep the
virtual_engine alive until after the sibling's execlists_dequeue() have
finished peeking into the virtual engines, for which we serialise with
RCU.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_lrc.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 417f6b0c6c61..cb04bc5474be 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -180,6 +180,7 @@
 #define EXECLISTS_REQUEST_SIZE 64 /* bytes */
 
 struct virtual_engine {
+	struct rcu_head rcu;
 	struct intel_engine_cs base;
 	struct intel_context context;
 
@@ -5393,10 +5394,25 @@ static void virtual_context_destroy(struct kref *kref)
 		container_of(kref, typeof(*ve), context.ref);
 	unsigned int n;
 
-	GEM_BUG_ON(!list_empty(virtual_queue(ve)));
-	GEM_BUG_ON(ve->request);
 	GEM_BUG_ON(ve->context.inflight);
 
+	if (unlikely(ve->request)) {
+		struct i915_request *old;
+		unsigned long flags;
+
+		spin_lock_irqsave(&ve->base.active.lock, flags);
+
+		old = fetch_and_zero(&ve->request);
+		if (old) {
+			GEM_BUG_ON(!i915_request_completed(old));
+			__i915_request_submit(old);
+			i915_request_put(old);
+		}
+
+		spin_unlock_irqrestore(&ve->base.active.lock, flags);
+	}
+	GEM_BUG_ON(!list_empty(virtual_queue(ve)));
+
 	for (n = 0; n < ve->num_siblings; n++) {
 		struct intel_engine_cs *sibling = ve->siblings[n];
 		struct rb_node *node = &ve->nodes[sibling->id].rb;
@@ -5422,7 +5438,7 @@ static void virtual_context_destroy(struct kref *kref)
 	intel_engine_free_request_pool(&ve->base);
 
 	kfree(ve->bonds);
-	kfree(ve);
+	kfree_rcu(ve, rcu);
 }
 
 static void virtual_engine_initial_hint(struct virtual_engine *ve)
-- 
2.20.1