[Intel-gfx] [PATCH 1/3] drm/i915/gt: Cancel submitted requests upon context reset

[Chris Wilson]

Since we process schedule-in of a context after submitting the request,
if we decide to reset the context at that time, we also have to cancel
the requets we have marked for submission.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 .../drm/i915/gt/intel_execlists_submission.c  | 22 +++++++++++++++++--
 drivers/gpu/drm/i915/i915_request.c           |  2 ++
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index 1fae6c6f3868..2123d9566061 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -466,6 +466,23 @@ static void intel_engine_context_out(struct intel_engine_cs *engine)
 	write_sequnlock_irqrestore(&engine->stats.lock, flags);
 }
 
+static struct i915_request *
+cancel_requests(const struct intel_timeline * const tl, struct i915_request *rq)
+{
+	struct i915_request *active = rq;
+
+	list_for_each_entry_from_reverse(rq, &tl->requests, link) {
+		if (__i915_request_is_complete(rq))
+			break;
+
+		i915_request_set_error_once(rq, -EIO);
+		__i915_request_skip(rq);
+		active = rq;
+	}
+
+	return active;
+}
+
 static void reset_active(struct i915_request *rq,
 			 struct intel_engine_cs *engine)
 {
@@ -487,14 +504,15 @@ static void reset_active(struct i915_request *rq,
 	 * remain correctly ordered. And we defer to __i915_request_submit()
 	 * so that all asynchronous waits are correctly handled.
 	 */
-	ENGINE_TRACE(engine, "{ rq=%llx:%lld }\n",
+	rq = cancel_requests(ce->timeline, rq);
+	ENGINE_TRACE(engine, "{ reset rq=%llx:%lld }\n",
 		     rq->fence.context, rq->fence.seqno);
 
 	/* On resubmission of the active request, payload will be scrubbed */
 	if (__i915_request_is_complete(rq))
 		head = rq->tail;
 	else
-		head = active_request(ce->timeline, rq)->head;
+		head = rq->head;
 	head = intel_ring_wrap(ce->ring, head);
 
 	/* Scrub the context image to prevent replaying the previous batch */
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 6578faf6eed8..ad3b6a4f424f 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -490,6 +490,8 @@ void __i915_request_skip(struct i915_request *rq)
 	if (rq->infix == rq->postfix)
 		return;
 
+	RQ_TRACE(rq, "error: %d\n", rq->fence.error);
+
 	/*
 	 * As this request likely depends on state from the lost
 	 * context, clear out all the user operations leaving the
-- 
2.20.1