drm/i915: Pull out some more common engine init code

Created two common helpers for engine setup and engine init phases
respectively to help with code sharing.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1468422221-12132-1-git-send-email-tvrtko.ursulin@linux.intel.com
Reviewed-by: Chris Wilson <chris-wilson.co.uk>

drivers/gpu/drm/i915/intel_engine_cs.c

@@ -160,3 +160,50 @@ cleanup:
 	return ret;
 }
 
+void intel_engine_init_hangcheck(struct intel_engine_cs *engine)
+{
+	memset(&engine->hangcheck, 0, sizeof(engine->hangcheck));
+}
+
+/**
+ * intel_engines_setup_common - setup engine state not requiring hw access
+ * @engine: Engine to setup.
+ *
+ * Initializes @engine@ structure members shared between legacy and execlists
+ * submission modes which do not require hardware access.
+ *
+ * Typically done early in the submission mode specific engine setup stage.
+ */
+void intel_engine_setup_common(struct intel_engine_cs *engine)
+{
+	INIT_LIST_HEAD(&engine->active_list);
+	INIT_LIST_HEAD(&engine->request_list);
+	INIT_LIST_HEAD(&engine->buffers);
+	INIT_LIST_HEAD(&engine->execlist_queue);
+	spin_lock_init(&engine->execlist_lock);
+
+	intel_engine_init_hangcheck(engine);
+	i915_gem_batch_pool_init(&engine->i915->drm, &engine->batch_pool);
+}
+
+/**
+ * intel_engines_init_common - initialize cengine state which might require hw access
+ * @engine: Engine to initialize.
+ *
+ * Initializes @engine@ structure members shared between legacy and execlists
+ * submission modes which do require hardware access.
+ *
+ * Typcally done at later stages of submission mode specific engine setup.
+ *
+ * Returns zero on success or an error code on failure.
+ */
+int intel_engine_init_common(struct intel_engine_cs *engine)
+{
+	int ret;
+
+	ret = intel_engine_init_breadcrumbs(engine);
+	if (ret)
+		return ret;
+
+	return i915_cmd_parser_init_ring(engine);
+}

drivers/gpu/drm/i915/intel_lrc.c

@@ -2009,6 +2009,8 @@ logical_ring_setup(struct intel_engine_cs *engine)
 	struct drm_i915_private *dev_priv = engine->i915;
 	enum forcewake_domains fw_domains;
 
+	intel_engine_setup_common(engine);
+
 	/* Intentionally left blank. */
 	engine->buffer = NULL;
 
@@ -2026,21 +2028,12 @@ logical_ring_setup(struct intel_engine_cs *engine)
 
 	engine->fw_domains = fw_domains;
 
-	INIT_LIST_HEAD(&engine->active_list);
-	INIT_LIST_HEAD(&engine->request_list);
-	INIT_LIST_HEAD(&engine->buffers);
-	INIT_LIST_HEAD(&engine->execlist_queue);
-	spin_lock_init(&engine->execlist_lock);
-
 	tasklet_init(&engine->irq_tasklet,
 		     intel_lrc_irq_handler, (unsigned long)engine);
 
 	logical_ring_init_platform_invariants(engine);
 	logical_ring_default_vfuncs(engine);
 	logical_ring_default_irqs(engine);
-
-	intel_engine_init_hangcheck(engine);
-	i915_gem_batch_pool_init(&dev_priv->drm, &engine->batch_pool);
 }
 
 static int
@@ -2049,11 +2042,7 @@ logical_ring_init(struct intel_engine_cs *engine)
 	struct i915_gem_context *dctx = engine->i915->kernel_context;
 	int ret;
 
-	ret = intel_engine_init_breadcrumbs(engine);
+	ret = intel_engine_init_common(engine);
-	if (ret)
-		goto error;
-
-	ret = i915_cmd_parser_init_ring(engine);
 	if (ret)
 		goto error;
 

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -549,11 +549,6 @@ static bool stop_ring(struct intel_engine_cs *engine)
 	return (I915_READ_HEAD(engine) & HEAD_ADDR) == 0;
 }
 
-void intel_engine_init_hangcheck(struct intel_engine_cs *engine)
-{
-	memset(&engine->hangcheck, 0, sizeof(engine->hangcheck));
-}
-
 static int init_ring_common(struct intel_engine_cs *engine)
 {
 	struct drm_i915_private *dev_priv = engine->i915;
@@ -2176,15 +2171,12 @@ static int intel_init_ring_buffer(struct intel_engine_cs *engine)
 
 	WARN_ON(engine->buffer);
 
-	INIT_LIST_HEAD(&engine->active_list);
+	intel_engine_setup_common(engine);
-	INIT_LIST_HEAD(&engine->request_list);
+
-	INIT_LIST_HEAD(&engine->execlist_queue);
-	INIT_LIST_HEAD(&engine->buffers);
-	i915_gem_batch_pool_init(&dev_priv->drm, &engine->batch_pool);
 	memset(engine->semaphore.sync_seqno, 0,
 	       sizeof(engine->semaphore.sync_seqno));
 
-	ret = intel_engine_init_breadcrumbs(engine);
+	ret = intel_engine_init_common(engine);
 	if (ret)
 		goto error;
 
@@ -2225,10 +2217,6 @@ static int intel_init_ring_buffer(struct intel_engine_cs *engine)
 		goto error;
 	}
 
-	ret = i915_cmd_parser_init_ring(engine);
-	if (ret)
-		goto error;
-
 	return 0;
 
 error:

drivers/gpu/drm/i915/intel_ringbuffer.h

@@ -480,6 +480,9 @@ int intel_ring_invalidate_all_caches(struct drm_i915_gem_request *req);
 int intel_init_pipe_control(struct intel_engine_cs *engine, int size);
 void intel_fini_pipe_control(struct intel_engine_cs *engine);
 
+void intel_engine_setup_common(struct intel_engine_cs *engine);
+int intel_engine_init_common(struct intel_engine_cs *engine);
+
 int intel_init_render_ring_buffer(struct intel_engine_cs *engine);
 int intel_init_bsd_ring_buffer(struct intel_engine_cs *engine);
 int intel_init_bsd2_ring_buffer(struct intel_engine_cs *engine);