[PATCH 18/32] drm/i915/execlists: Always request completion before marking an error

[Chris Wilson]

Due to fun and games in our preempt-to-busy, it is possible for a
request to be completed in the background. Be vigilant and avoid setting
an error on already signaled request, as dma_fence_set_error() throws a
warning.

Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/gt/intel_lrc.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index cdbaf46a7847..242b2e36da05 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -235,6 +235,13 @@ static void execlists_init_reg_state(u32 *reg_state,
 				     const struct intel_ring *ring,
 				     bool close);
 
+static void mark_eio(struct i915_request *rq)
+{
+	if (!i915_request_signaled(rq))
+		dma_fence_set_error(&rq->fence, -EIO);
+	i915_request_mark_complete(rq);
+}
+
 static inline u32 intel_hws_preempt_address(struct intel_engine_cs *engine)
 {
 	return (i915_ggtt_offset(engine->status_page.vma) +
@@ -2859,12 +2866,8 @@ static void execlists_cancel_requests(struct intel_engine_cs *engine)
 	__execlists_reset(engine, true);
 
 	/* Mark all executing requests as skipped. */
-	list_for_each_entry(rq, &engine->active.requests, sched.link) {
-		if (!i915_request_signaled(rq))
-			dma_fence_set_error(&rq->fence, -EIO);
-
-		i915_request_mark_complete(rq);
-	}
+	list_for_each_entry(rq, &engine->active.requests, sched.link)
+		mark_eio(rq);
 
 	/* Flush the queued requests to the timeline list (for retiring). */
 	while ((rb = rb_first_cached(&execlists->queue))) {
@@ -2874,8 +2877,7 @@ static void execlists_cancel_requests(struct intel_engine_cs *engine)
 		priolist_for_each_request_consume(rq, rn, p, i) {
 			list_del_init(&rq->sched.link);
 			__i915_request_submit(rq);
-			dma_fence_set_error(&rq->fence, -EIO);
-			i915_request_mark_complete(rq);
+			mark_eio(rq);
 		}
 
 		rb_erase_cached(&p->node, &execlists->queue);
@@ -2894,8 +2896,7 @@ static void execlists_cancel_requests(struct intel_engine_cs *engine)
 		if (ve->request) {
 			ve->request->engine = engine;
 			__i915_request_submit(ve->request);
-			dma_fence_set_error(&ve->request->fence, -EIO);
-			i915_request_mark_complete(ve->request);
+			mark_eio(ve->request);
 			ve->base.execlists.queue_priority_hint = INT_MIN;
 			ve->request = NULL;
 		}
-- 
2.23.0