[PATCH v2] drm/i915/guc: Remove preemption support for current fw

* [PATCH v2] drm/i915/guc: Remove preemption support for current fw
@ 2019-07-01 20:28 Daniele Ceraolo Spurio
  2019-07-01 21:00 ` ✗ Fi.CI.SPARSE: warning for drm/i915/guc: Remove preemption support for current fw (rev2) Patchwork
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Daniele Ceraolo Spurio @ 2019-07-01 20:28 UTC (permalink / raw)
  To: intel-gfx

From: Chris Wilson <chris@chris-wilson.co.uk>

Preemption via GuC submission is not being supported with its current
legacy incarnation. The current FW does support a similar pre-emption
flow via H2G, but it is class-based instead of being instance-based,
which doesn't fit well with the i915 tracking. To fix this, the
firmware is being updated to better support our needs with a new flow,
so we can safely remove the old code.

v2 (Daniele): resurrect & rebase, reword commit message, remove
preempt_context as well

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_context.c  |  17 --
 drivers/gpu/drm/i915/gt/intel_engine_cs.c    |  13 --
 drivers/gpu/drm/i915/gt/intel_engine_types.h |   1 -
 drivers/gpu/drm/i915/gt/intel_gt_pm.c        |   4 -
 drivers/gpu/drm/i915/i915_debugfs.c          |   5 -
 drivers/gpu/drm/i915/i915_drv.h              |   2 -
 drivers/gpu/drm/i915/intel_guc.c             |  31 ---
 drivers/gpu/drm/i915/intel_guc.h             |   9 -
 drivers/gpu/drm/i915/intel_guc_submission.c  | 220 +------------------
 drivers/gpu/drm/i915/selftests/intel_guc.c   |  31 +--
 10 files changed, 14 insertions(+), 319 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 8a9787cf0cd0..9c695910bc43 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -644,18 +644,12 @@ static void init_contexts(struct drm_i915_private *i915)
 	init_llist_head(&i915->contexts.free_list);
 }
 
-static bool needs_preempt_context(struct drm_i915_private *i915)
-{
-	return USES_GUC_SUBMISSION(i915);
-}
-
 int i915_gem_contexts_init(struct drm_i915_private *dev_priv)
 {
 	struct i915_gem_context *ctx;
 
 	/* Reassure ourselves we are only called once */
 	GEM_BUG_ON(dev_priv->kernel_context);
-	GEM_BUG_ON(dev_priv->preempt_context);
 
 	intel_engine_init_ctx_wa(dev_priv->engine[RCS0]);
 	init_contexts(dev_priv);
@@ -677,15 +671,6 @@ int i915_gem_contexts_init(struct drm_i915_private *dev_priv)
 	GEM_BUG_ON(!atomic_read(&ctx->hw_id_pin_count));
 	dev_priv->kernel_context = ctx;
 
-	/* highest priority; preempting task */
-	if (needs_preempt_context(dev_priv)) {
-		ctx = i915_gem_context_create_kernel(dev_priv, INT_MAX);
-		if (!IS_ERR(ctx))
-			dev_priv->preempt_context = ctx;
-		else
-			DRM_ERROR("Failed to create preempt context; disabling preemption\n");
-	}
-
 	DRM_DEBUG_DRIVER("%s context support initialized\n",
 			 DRIVER_CAPS(dev_priv)->has_logical_contexts ?
 			 "logical" : "fake");
@@ -696,8 +681,6 @@ void i915_gem_contexts_fini(struct drm_i915_private *i915)
 {
 	lockdep_assert_held(&i915->drm.struct_mutex);
 
-	if (i915->preempt_context)
-		destroy_kernel_context(&i915->preempt_context);
 	destroy_kernel_context(&i915->kernel_context);
 
 	/* Must free all deferred contexts (via flush_workqueue) first */
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index d1508f0b4c84..55b11409c1f0 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -842,15 +842,6 @@ int intel_engine_init_common(struct intel_engine_cs *engine)
 	if (ret)
 		return ret;
 
-	/*
-	 * Similarly the preempt context must always be available so that
-	 * we can interrupt the engine at any time. However, as preemption
-	 * is optional, we allow it to fail.
-	 */
-	if (i915->preempt_context)
-		pin_context(i915->preempt_context, engine,
-			    &engine->preempt_context);
-
 	ret = measure_breadcrumb_dw(engine);
 	if (ret < 0)
 		goto err_unpin;
@@ -862,8 +853,6 @@ int intel_engine_init_common(struct intel_engine_cs *engine)
 	return 0;
 
 err_unpin:
-	if (engine->preempt_context)
-		intel_context_unpin(engine->preempt_context);
 	intel_context_unpin(engine->kernel_context);
 	return ret;
 }
@@ -888,8 +877,6 @@ void intel_engine_cleanup_common(struct intel_engine_cs *engine)
 	if (engine->default_state)
 		i915_gem_object_put(engine->default_state);
 
-	if (engine->preempt_context)
-		intel_context_unpin(engine->preempt_context);
 	intel_context_unpin(engine->kernel_context);
 	GEM_BUG_ON(!llist_empty(&engine->barrier_tasks));
 
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
index 7e056114344e..8be63019d707 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
@@ -288,7 +288,6 @@ struct intel_engine_cs {
 	struct llist_head barrier_tasks;
 
 	struct intel_context *kernel_context; /* pinned */
-	struct intel_context *preempt_context; /* pinned; optional */
 
 	intel_engine_mask_t saturated; /* submitting semaphores too late? */
 
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
index 36ba80e6a0b7..da81b3a92d16 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
@@ -145,10 +145,6 @@ int intel_gt_resume(struct intel_gt *gt)
 		if (ce)
 			ce->ops->reset(ce);
 
-		ce = engine->preempt_context;
-		if (ce)
-			ce->ops->reset(ce);
-
 		engine->serial++; /* kernel context lost */
 		err = engine->resume(engine);
 
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index eeecdad0e3ca..02eaa15d47c0 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2017,11 +2017,6 @@ static int i915_guc_info(struct seq_file *m, void *data)
 
 	seq_printf(m, "\nGuC execbuf client @ %p:\n", guc->execbuf_client);
 	i915_guc_client_info(m, dev_priv, guc->execbuf_client);
-	if (guc->preempt_client) {
-		seq_printf(m, "\nGuC preempt client @ %p:\n",
-			   guc->preempt_client);
-		i915_guc_client_info(m, dev_priv, guc->preempt_client);
-	}
 
 	/* Add more as required ... */
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 02dd9f9f3a89..1cdd06539dc5 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1378,8 +1378,6 @@ struct drm_i915_private {
 	struct intel_engine_cs *engine[I915_NUM_ENGINES];
 	/* Context used internally to idle the GPU and setup initial state */
 	struct i915_gem_context *kernel_context;
-	/* Context only to be used for injecting preemption commands */
-	struct i915_gem_context *preempt_context;
 	struct intel_engine_cs *engine_class[MAX_ENGINE_CLASS + 1]
 					    [MAX_ENGINE_INSTANCE + 1];
 
diff --git a/drivers/gpu/drm/i915/intel_guc.c b/drivers/gpu/drm/i915/intel_guc.c
index c40a6efdd33a..501b74f44374 100644
--- a/drivers/gpu/drm/i915/intel_guc.c
+++ b/drivers/gpu/drm/i915/intel_guc.c
@@ -101,8 +101,6 @@ void intel_guc_init_early(struct intel_guc *guc)
 
 static int guc_init_wq(struct intel_guc *guc)
 {
-	struct drm_i915_private *dev_priv = guc_to_i915(guc);
-
 	/*
 	 * GuC log buffer flush work item has to do register access to
 	 * send the ack to GuC and this work item, if not synced before
@@ -122,31 +120,6 @@ static int guc_init_wq(struct intel_guc *guc)
 		return -ENOMEM;
 	}
 
-	/*
-	 * Even though both sending GuC action, and adding a new workitem to
-	 * GuC workqueue are serialized (each with its own locking), since
-	 * we're using mutliple engines, it's possible that we're going to
-	 * issue a preempt request with two (or more - each for different
-	 * engine) workitems in GuC queue. In this situation, GuC may submit
-	 * all of them, which will make us very confused.
-	 * Our preemption contexts may even already be complete - before we
-	 * even had the chance to sent the preempt action to GuC!. Rather
-	 * than introducing yet another lock, we can just use ordered workqueue
-	 * to make sure we're always sending a single preemption request with a
-	 * single workitem.
-	 */
-	if (HAS_LOGICAL_RING_PREEMPTION(dev_priv) &&
-	    USES_GUC_SUBMISSION(dev_priv)) {
-		guc->preempt_wq = alloc_ordered_workqueue("i915-guc_preempt",
-							  WQ_HIGHPRI);
-		if (!guc->preempt_wq) {
-			destroy_workqueue(guc->log.relay.flush_wq);
-			DRM_ERROR("Couldn't allocate workqueue for GuC "
-				  "preemption\n");
-			return -ENOMEM;
-		}
-	}
-
 	return 0;
 }
 
@@ -154,10 +127,6 @@ static void guc_fini_wq(struct intel_guc *guc)
 {
 	struct workqueue_struct *wq;
 
-	wq = fetch_and_zero(&guc->preempt_wq);
-	if (wq)
-		destroy_workqueue(wq);
-
 	wq = fetch_and_zero(&guc->log.relay.flush_wq);
 	if (wq)
 		destroy_workqueue(wq);
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index d91c96679dbb..ec1038c1f50e 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -37,11 +37,6 @@
 
 struct __guc_ads_blob;
 
-struct guc_preempt_work {
-	struct work_struct work;
-	struct intel_engine_cs *engine;
-};
-
 /*
  * Top level structure of GuC. It handles firmware loading and manages client
  * pool and doorbells. intel_guc owns a intel_guc_client to replace the legacy
@@ -76,10 +71,6 @@ struct intel_guc {
 	void *shared_data_vaddr;
 
 	struct intel_guc_client *execbuf_client;
-	struct intel_guc_client *preempt_client;
-
-	struct guc_preempt_work preempt_work[I915_NUM_ENGINES];
-	struct workqueue_struct *preempt_wq;
 
 	DECLARE_BITMAP(doorbell_bitmap, GUC_NUM_DOORBELLS);
 	/* Cyclic counter mod pagesize	*/
diff --git a/drivers/gpu/drm/i915/intel_guc_submission.c b/drivers/gpu/drm/i915/intel_guc_submission.c
index 12c22359fdac..8520bb224175 100644
--- a/drivers/gpu/drm/i915/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/intel_guc_submission.c
@@ -46,11 +46,10 @@ enum {
  *
  * GuC client:
  * A intel_guc_client refers to a submission path through GuC. Currently, there
- * are two clients. One of them (the execbuf_client) is charged with all
- * submissions to the GuC, the other one (preempt_client) is responsible for
- * preempting the execbuf_client. This struct is the owner of a doorbell, a
- * process descriptor and a workqueue (all of them inside a single gem object
- * that contains all required pages for these elements).
+ * is only one client, which is charged with all submissions to the GuC. This
+ * struct is the owner of a doorbell, a process descriptor and a workqueue (all
+ * of them inside a single gem object that contains all required pages for these
+ * elements).
  *
  * GuC stage descriptor:
  * During initialization, the driver allocates a static pool of 1024 such
@@ -88,12 +87,6 @@ enum {
  *
  */
 
-static inline u32 intel_hws_preempt_done_address(struct intel_engine_cs *engine)
-{
-	return (i915_ggtt_offset(engine->status_page.vma) +
-		I915_GEM_HWS_PREEMPT_ADDR);
-}
-
 static inline struct i915_priolist *to_priolist(struct rb_node *rb)
 {
 	return rb_entry(rb, struct i915_priolist, node);
@@ -563,126 +556,6 @@ static void flush_ggtt_writes(struct i915_vma *vma)
 		intel_uncore_posting_read_fw(&i915->uncore, GUC_STATUS);
 }
 
-static void inject_preempt_context(struct work_struct *work)
-{
-	struct guc_preempt_work *preempt_work =
-		container_of(work, typeof(*preempt_work), work);
-	struct intel_engine_cs *engine = preempt_work->engine;
-	struct intel_guc *guc = container_of(preempt_work, typeof(*guc),
-					     preempt_work[engine->id]);
-	struct intel_guc_client *client = guc->preempt_client;
-	struct guc_stage_desc *stage_desc = __get_stage_desc(client);
-	struct intel_context *ce = engine->preempt_context;
-	u32 data[7];
-
-	if (!ce->ring->emit) { /* recreate upon load/resume */
-		u32 addr = intel_hws_preempt_done_address(engine);
-		u32 *cs;
-
-		cs = ce->ring->vaddr;
-		if (engine->class == RENDER_CLASS) {
-			cs = gen8_emit_ggtt_write_rcs(cs,
-						      GUC_PREEMPT_FINISHED,
-						      addr,
-						      PIPE_CONTROL_CS_STALL);
-		} else {
-			cs = gen8_emit_ggtt_write(cs,
-						  GUC_PREEMPT_FINISHED,
-						  addr,
-						  0);
-			*cs++ = MI_NOOP;
-			*cs++ = MI_NOOP;
-		}
-		*cs++ = MI_USER_INTERRUPT;
-		*cs++ = MI_NOOP;
-
-		ce->ring->emit = GUC_PREEMPT_BREADCRUMB_BYTES;
-		GEM_BUG_ON((void *)cs - ce->ring->vaddr != ce->ring->emit);
-
-		flush_ggtt_writes(ce->ring->vma);
-	}
-
-	spin_lock_irq(&client->wq_lock);
-	guc_wq_item_append(client, engine->guc_id, lower_32_bits(ce->lrc_desc),
-			   GUC_PREEMPT_BREADCRUMB_BYTES / sizeof(u64), 0);
-	spin_unlock_irq(&client->wq_lock);
-
-	/*
-	 * If GuC firmware performs an engine reset while that engine had
-	 * a preemption pending, it will set the terminated attribute bit
-	 * on our preemption stage descriptor. GuC firmware retains all
-	 * pending work items for a high-priority GuC client, unlike the
-	 * normal-priority GuC client where work items are dropped. It
-	 * wants to make sure the preempt-to-idle work doesn't run when
-	 * scheduling resumes, and uses this bit to inform its scheduler
-	 * and presumably us as well. Our job is to clear it for the next
-	 * preemption after reset, otherwise that and future preemptions
-	 * will never complete. We'll just clear it every time.
-	 */
-	stage_desc->attribute &= ~GUC_STAGE_DESC_ATTR_TERMINATED;
-
-	data[0] = INTEL_GUC_ACTION_REQUEST_PREEMPTION;
-	data[1] = client->stage_id;
-	data[2] = INTEL_GUC_PREEMPT_OPTION_DROP_WORK_Q |
-		  INTEL_GUC_PREEMPT_OPTION_DROP_SUBMIT_Q;
-	data[3] = engine->guc_id;
-	data[4] = guc->execbuf_client->priority;
-	data[5] = guc->execbuf_client->stage_id;
-	data[6] = intel_guc_ggtt_offset(guc, guc->shared_data);
-
-	if (WARN_ON(intel_guc_send(guc, data, ARRAY_SIZE(data)))) {
-		intel_write_status_page(engine,
-					I915_GEM_HWS_PREEMPT,
-					GUC_PREEMPT_NONE);
-		tasklet_schedule(&engine->execlists.tasklet);
-	}
-
-	(void)I915_SELFTEST_ONLY(engine->execlists.preempt_hang.count++);
-}
-
-/*
- * We're using user interrupt and HWSP value to mark that preemption has
- * finished and GPU is idle. Normally, we could unwind and continue similar to
- * execlists submission path. Unfortunately, with GuC we also need to wait for
- * it to finish its own postprocessing, before attempting to submit. Otherwise
- * GuC may silently ignore our submissions, and thus we risk losing request at
- * best, executing out-of-order and causing kernel panic at worst.
- */
-#define GUC_PREEMPT_POSTPROCESS_DELAY_MS 10
-static void wait_for_guc_preempt_report(struct intel_engine_cs *engine)
-{
-	struct intel_guc *guc = &engine->i915->guc;
-	struct guc_shared_ctx_data *data = guc->shared_data_vaddr;
-	struct guc_ctx_report *report =
-		&data->preempt_ctx_report[engine->guc_id];
-
-	if (wait_for_atomic(report->report_return_status ==
-			    INTEL_GUC_REPORT_STATUS_COMPLETE,
-			    GUC_PREEMPT_POSTPROCESS_DELAY_MS))
-		DRM_ERROR("Timed out waiting for GuC preemption report\n");
-	/*
-	 * GuC is expecting that we're also going to clear the affected context
-	 * counter, let's also reset the return status to not depend on GuC
-	 * resetting it after recieving another preempt action
-	 */
-	report->affected_count = 0;
-	report->report_return_status = INTEL_GUC_REPORT_STATUS_UNKNOWN;
-}
-
-static void complete_preempt_context(struct intel_engine_cs *engine)
-{
-	struct intel_engine_execlists *execlists = &engine->execlists;
-
-	if (inject_preempt_hang(execlists))
-		return;
-
-	execlists_cancel_port_requests(execlists);
-	execlists_unwind_incomplete_requests(execlists);
-
-	wait_for_guc_preempt_report(engine);
-	intel_write_status_page(engine, I915_GEM_HWS_PREEMPT, GUC_PREEMPT_NONE);
-}
-
 static void guc_submit(struct intel_engine_cs *engine,
 		       struct i915_request **out,
 		       struct i915_request **end)
@@ -742,21 +615,6 @@ static void __guc_dequeue(struct intel_engine_cs *engine)
 	lockdep_assert_held(&engine->active.lock);
 
 	if (last) {
-		if (intel_engine_has_preemption(engine)) {
-			struct guc_preempt_work *preempt_work =
-				&engine->i915->guc.preempt_work[engine->id];
-			int prio = execlists->queue_priority_hint;
-
-			if (i915_scheduler_need_preempt(prio, rq_prio(last))) {
-				intel_write_status_page(engine,
-							I915_GEM_HWS_PREEMPT,
-							GUC_PREEMPT_INPROGRESS);
-				queue_work(engine->i915->guc.preempt_wq,
-					   &preempt_work->work);
-				return;
-			}
-		}
-
 		if (*++first)
 			return;
 
@@ -820,12 +678,7 @@ static void guc_submission_tasklet(unsigned long data)
 		memmove(execlists->inflight, port, rem * sizeof(*port));
 	}
 
-	if (intel_read_status_page(engine, I915_GEM_HWS_PREEMPT) ==
-	    GUC_PREEMPT_FINISHED)
-		complete_preempt_context(engine);
-
-	if (!intel_read_status_page(engine, I915_GEM_HWS_PREEMPT))
-		__guc_dequeue(engine);
+	__guc_dequeue(engine);
 
 	spin_unlock_irqrestore(&engine->active.lock, flags);
 }
@@ -846,16 +699,6 @@ static void guc_reset_prepare(struct intel_engine_cs *engine)
 	 * prevents the race.
 	 */
 	__tasklet_disable_sync_once(&execlists->tasklet);
-
-	/*
-	 * We're using worker to queue preemption requests from the tasklet in
-	 * GuC submission mode.
-	 * Even though tasklet was disabled, we may still have a worker queued.
-	 * Let's make sure that all workers scheduled before disabling the
-	 * tasklet are completed before continuing with the reset.
-	 */
-	if (engine->i915->guc.preempt_wq)
-		flush_workqueue(engine->i915->guc.preempt_wq);
 }
 
 static void guc_reset(struct intel_engine_cs *engine, bool stalled)
@@ -1112,7 +955,6 @@ static int guc_clients_create(struct intel_guc *guc)
 	struct intel_guc_client *client;
 
 	GEM_BUG_ON(guc->execbuf_client);
-	GEM_BUG_ON(guc->preempt_client);
 
 	client = guc_client_alloc(dev_priv,
 				  INTEL_INFO(dev_priv)->engine_mask,
@@ -1124,20 +966,6 @@ static int guc_clients_create(struct intel_guc *guc)
 	}
 	guc->execbuf_client = client;
 
-	if (dev_priv->preempt_context) {
-		client = guc_client_alloc(dev_priv,
-					  INTEL_INFO(dev_priv)->engine_mask,
-					  GUC_CLIENT_PRIORITY_KMD_HIGH,
-					  dev_priv->preempt_context);
-		if (IS_ERR(client)) {
-			DRM_ERROR("Failed to create GuC client for preemption!\n");
-			guc_client_free(guc->execbuf_client);
-			guc->execbuf_client = NULL;
-			return PTR_ERR(client);
-		}
-		guc->preempt_client = client;
-	}
-
 	return 0;
 }
 
@@ -1145,10 +973,6 @@ static void guc_clients_destroy(struct intel_guc *guc)
 {
 	struct intel_guc_client *client;
 
-	client = fetch_and_zero(&guc->preempt_client);
-	if (client)
-		guc_client_free(client);
-
 	client = fetch_and_zero(&guc->execbuf_client);
 	if (client)
 		guc_client_free(client);
@@ -1191,28 +1015,11 @@ static void __guc_client_disable(struct intel_guc_client *client)
 
 static int guc_clients_enable(struct intel_guc *guc)
 {
-	int ret;
-
-	ret = __guc_client_enable(guc->execbuf_client);
-	if (ret)
-		return ret;
-
-	if (guc->preempt_client) {
-		ret = __guc_client_enable(guc->preempt_client);
-		if (ret) {
-			__guc_client_disable(guc->execbuf_client);
-			return ret;
-		}
-	}
-
-	return 0;
+	return __guc_client_enable(guc->execbuf_client);
 }
 
 static void guc_clients_disable(struct intel_guc *guc)
 {
-	if (guc->preempt_client)
-		__guc_client_disable(guc->preempt_client);
-
 	if (guc->execbuf_client)
 		__guc_client_disable(guc->execbuf_client);
 }
@@ -1223,9 +1030,6 @@ static void guc_clients_disable(struct intel_guc *guc)
  */
 int intel_guc_submission_init(struct intel_guc *guc)
 {
-	struct drm_i915_private *dev_priv = guc_to_i915(guc);
-	struct intel_engine_cs *engine;
-	enum intel_engine_id id;
 	int ret;
 
 	if (guc->stage_desc_pool)
@@ -1245,11 +1049,6 @@ int intel_guc_submission_init(struct intel_guc *guc)
 	if (ret)
 		goto err_pool;
 
-	for_each_engine(engine, dev_priv, id) {
-		guc->preempt_work[id].engine = engine;
-		INIT_WORK(&guc->preempt_work[id].work, inject_preempt_context);
-	}
-
 	return 0;
 
 err_pool:
@@ -1259,13 +1058,6 @@ int intel_guc_submission_init(struct intel_guc *guc)
 
 void intel_guc_submission_fini(struct intel_guc *guc)
 {
-	struct drm_i915_private *dev_priv = guc_to_i915(guc);
-	struct intel_engine_cs *engine;
-	enum intel_engine_id id;
-
-	for_each_engine(engine, dev_priv, id)
-		cancel_work_sync(&guc->preempt_work[id].work);
-
 	guc_clients_destroy(guc);
 	WARN_ON(!guc_verify_doorbells(guc));
 
diff --git a/drivers/gpu/drm/i915/selftests/intel_guc.c b/drivers/gpu/drm/i915/selftests/intel_guc.c
index 6ca8584cd64c..1a1915e44f6b 100644
--- a/drivers/gpu/drm/i915/selftests/intel_guc.c
+++ b/drivers/gpu/drm/i915/selftests/intel_guc.c
@@ -103,13 +103,10 @@ static int ring_doorbell_nop(struct intel_guc_client *client)
 /*
  * Basic client sanity check, handy to validate create_clients.
  */
-static int validate_client(struct intel_guc_client *client,
-			   int client_priority,
-			   bool is_preempt_client)
+static int validate_client(struct intel_guc_client *client, int client_priority)
 {
 	struct drm_i915_private *dev_priv = guc_to_i915(client->guc);
-	struct i915_gem_context *ctx_owner = is_preempt_client ?
-			dev_priv->preempt_context : dev_priv->kernel_context;
+	struct i915_gem_context *ctx_owner = dev_priv->kernel_context;
 
 	if (client->owner != ctx_owner ||
 	    client->engines != INTEL_INFO(dev_priv)->engine_mask ||
@@ -163,7 +160,7 @@ static int igt_guc_clients(void *args)
 	 */
 	guc_clients_disable(guc);
 	guc_clients_destroy(guc);
-	if (guc->execbuf_client || guc->preempt_client) {
+	if (guc->execbuf_client) {
 		pr_err("guc_clients_destroy lied!\n");
 		err = -EINVAL;
 		goto unlock;
@@ -177,24 +174,14 @@ static int igt_guc_clients(void *args)
 	GEM_BUG_ON(!guc->execbuf_client);
 
 	err = validate_client(guc->execbuf_client,
-			      GUC_CLIENT_PRIORITY_KMD_NORMAL, false);
+			      GUC_CLIENT_PRIORITY_KMD_NORMAL);
 	if (err) {
 		pr_err("execbug client validation failed\n");
 		goto out;
 	}
 
-	if (guc->preempt_client) {
-		err = validate_client(guc->preempt_client,
-				      GUC_CLIENT_PRIORITY_KMD_HIGH, true);
-		if (err) {
-			pr_err("preempt client validation failed\n");
-			goto out;
-		}
-	}
-
-	/* each client should now have reserved a doorbell */
-	if (!has_doorbell(guc->execbuf_client) ||
-	    (guc->preempt_client && !has_doorbell(guc->preempt_client))) {
+	/* the client should now have reserved a doorbell */
+	if (!has_doorbell(guc->execbuf_client)) {
 		pr_err("guc_clients_create didn't reserve doorbells\n");
 		err = -EINVAL;
 		goto out;
@@ -204,8 +191,7 @@ static int igt_guc_clients(void *args)
 	guc_clients_enable(guc);
 
 	/* each client should now have received a doorbell */
-	if (!client_doorbell_in_sync(guc->execbuf_client) ||
-	    !client_doorbell_in_sync(guc->preempt_client)) {
+	if (!client_doorbell_in_sync(guc->execbuf_client)) {
 		pr_err("failed to initialize the doorbells\n");
 		err = -EINVAL;
 		goto out;
@@ -300,8 +286,7 @@ static int igt_guc_doorbells(void *arg)
 			goto out;
 		}
 
-		err = validate_client(clients[i],
-				      i % GUC_CLIENT_PRIORITY_NUM, false);
+		err = validate_client(clients[i], i % GUC_CLIENT_PRIORITY_NUM);
 		if (err) {
 			pr_err("[%d] client_alloc sanity check failed!\n", i);
 			err = -EINVAL;
-- 
2.20.1

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