drm/i915/selftests: Remove live_suppress_wait_preempt

With the removal of the internal wait-priority boosting, we can also
remove the selftest to ensure that those waits were being suppressed
from causing preemptions.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200607222108.14401-4-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gt/selftest_lrc.c

@@ -2379,183 +2379,6 @@ static int live_suppress_self_preempt(void *arg)
 	goto err_client_b;
 }
 
-static int __i915_sw_fence_call
-dummy_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
-{
-	return NOTIFY_DONE;
-}
-
-static struct i915_request *dummy_request(struct intel_engine_cs *engine)
-{
-	struct i915_request *rq;
-
-	rq = kzalloc(sizeof(*rq), GFP_KERNEL);
-	if (!rq)
-		return NULL;
-
-	rq->engine = engine;
-
-	spin_lock_init(&rq->lock);
-	INIT_LIST_HEAD(&rq->fence.cb_list);
-	rq->fence.lock = &rq->lock;
-	rq->fence.ops = &i915_fence_ops;
-
-	i915_sched_node_init(&rq->sched);
-
-	/* mark this request as permanently incomplete */
-	rq->fence.seqno = 1;
-	BUILD_BUG_ON(sizeof(rq->fence.seqno) != 8); /* upper 32b == 0 */
-	rq->hwsp_seqno = (u32 *)&rq->fence.seqno + 1;
-	GEM_BUG_ON(i915_request_completed(rq));
-
-	i915_sw_fence_init(&rq->submit, dummy_notify);
-	set_bit(I915_FENCE_FLAG_ACTIVE, &rq->fence.flags);
-
-	spin_lock_init(&rq->lock);
-	rq->fence.lock = &rq->lock;
-	INIT_LIST_HEAD(&rq->fence.cb_list);
-
-	return rq;
-}
-
-static void dummy_request_free(struct i915_request *dummy)
-{
-	/* We have to fake the CS interrupt to kick the next request */
-	i915_sw_fence_commit(&dummy->submit);
-
-	i915_request_mark_complete(dummy);
-	dma_fence_signal(&dummy->fence);
-
-	i915_sched_node_fini(&dummy->sched);
-	i915_sw_fence_fini(&dummy->submit);
-
-	dma_fence_free(&dummy->fence);
-}
-
-static int live_suppress_wait_preempt(void *arg)
-{
-	struct intel_gt *gt = arg;
-	struct preempt_client client[4];
-	struct i915_request *rq[ARRAY_SIZE(client)] = {};
-	struct intel_engine_cs *engine;
-	enum intel_engine_id id;
-	int err = -ENOMEM;
-	int i;
-
-	/*
-	 * Waiters are given a little priority nudge, but not enough
-	 * to actually cause any preemption. Double check that we do
-	 * not needlessly generate preempt-to-idle cycles.
-	 */
-
-	if (!HAS_LOGICAL_RING_PREEMPTION(gt->i915))
-		return 0;
-
-	if (preempt_client_init(gt, &client[0])) /* ELSP[0] */
-		return -ENOMEM;
-	if (preempt_client_init(gt, &client[1])) /* ELSP[1] */
-		goto err_client_0;
-	if (preempt_client_init(gt, &client[2])) /* head of queue */
-		goto err_client_1;
-	if (preempt_client_init(gt, &client[3])) /* bystander */
-		goto err_client_2;
-
-	for_each_engine(engine, gt, id) {
-		int depth;
-
-		if (!intel_engine_has_preemption(engine))
-			continue;
-
-		if (!engine->emit_init_breadcrumb)
-			continue;
-
-		for (depth = 0; depth < ARRAY_SIZE(client); depth++) {
-			struct i915_request *dummy;
-
-			engine->execlists.preempt_hang.count = 0;
-
-			dummy = dummy_request(engine);
-			if (!dummy)
-				goto err_client_3;
-
-			for (i = 0; i < ARRAY_SIZE(client); i++) {
-				struct i915_request *this;
-
-				this = spinner_create_request(&client[i].spin,
-							      client[i].ctx, engine,
-							      MI_NOOP);
-				if (IS_ERR(this)) {
-					err = PTR_ERR(this);
-					goto err_wedged;
-				}
-
-				/* Disable NEWCLIENT promotion */
-				__i915_active_fence_set(&i915_request_timeline(this)->last_request,
-							&dummy->fence);
-
-				rq[i] = i915_request_get(this);
-				i915_request_add(this);
-			}
-
-			dummy_request_free(dummy);
-
-			GEM_BUG_ON(i915_request_completed(rq[0]));
-			if (!igt_wait_for_spinner(&client[0].spin, rq[0])) {
-				pr_err("%s: First client failed to start\n",
-				       engine->name);
-				goto err_wedged;
-			}
-			GEM_BUG_ON(!i915_request_started(rq[0]));
-
-			if (i915_request_wait(rq[depth],
-					      I915_WAIT_PRIORITY,
-					      1) != -ETIME) {
-				pr_err("%s: Waiter depth:%d completed!\n",
-				       engine->name, depth);
-				goto err_wedged;
-			}
-
-			for (i = 0; i < ARRAY_SIZE(client); i++) {
-				igt_spinner_end(&client[i].spin);
-				i915_request_put(rq[i]);
-				rq[i] = NULL;
-			}
-
-			if (igt_flush_test(gt->i915))
-				goto err_wedged;
-
-			if (engine->execlists.preempt_hang.count) {
-				pr_err("%s: Preemption recorded x%d, depth %d; should have been suppressed!\n",
-				       engine->name,
-				       engine->execlists.preempt_hang.count,
-				       depth);
-				err = -EINVAL;
-				goto err_client_3;
-			}
-		}
-	}
-
-	err = 0;
-err_client_3:
-	preempt_client_fini(&client[3]);
-err_client_2:
-	preempt_client_fini(&client[2]);
-err_client_1:
-	preempt_client_fini(&client[1]);
-err_client_0:
-	preempt_client_fini(&client[0]);
-	return err;
-
-err_wedged:
-	for (i = 0; i < ARRAY_SIZE(client); i++) {
-		igt_spinner_end(&client[i].spin);
-		i915_request_put(rq[i]);
-	}
-	intel_gt_set_wedged(gt);
-	err = -EIO;
-	goto err_client_3;
-}
-
 static int live_chain_preempt(void *arg)
 {
 	struct intel_gt *gt = arg;
@@ -4592,7 +4415,6 @@ int intel_execlists_live_selftests(struct drm_i915_private *i915)
 		SUBTEST(live_nopreempt),
 		SUBTEST(live_preempt_cancel),
 		SUBTEST(live_suppress_self_preempt),
-		SUBTEST(live_suppress_wait_preempt),
 		SUBTEST(live_chain_preempt),
 		SUBTEST(live_preempt_gang),
 		SUBTEST(live_preempt_timeout),