[Intel-gfx] [PATCH] drm/i915: Collect user engines at driver_register phase

[Michal Wajdeczko]

There is no need to add engines to early uabi list one by one
during engine setup, we can collect all engines while doing final
renames at driver_register phase. This will also unblock us in
case we would need to do some late modifications of the engine
list after engine setup but before starting uabi registration.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_engine_cs.c   |  1 -
 drivers/gpu/drm/i915/gt/intel_engine_user.c | 15 +++++++++++++--
 drivers/gpu/drm/i915/gt/intel_engine_user.h |  1 -
 drivers/gpu/drm/i915/gt/mock_engine.c       |  2 --
 4 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 9cc1ea6519ec..12056ad30b14 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -342,7 +342,6 @@ static int intel_engine_setup(struct intel_gt *gt, enum intel_engine_id id)
 	gt->engine_class[info->class][info->instance] = engine;
 	gt->engine[id] = engine;
 
-	intel_engine_add_user(engine);
 	gt->i915->engine[id] = engine;
 
 	return 0;
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_user.c b/drivers/gpu/drm/i915/gt/intel_engine_user.c
index 7f7150a733f4..e9231e27cdf1 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_user.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_user.c
@@ -35,10 +35,20 @@ intel_engine_lookup_user(struct drm_i915_private *i915, u8 class, u8 instance)
 	return NULL;
 }
 
-void intel_engine_add_user(struct intel_engine_cs *engine)
+static void add_engine(struct drm_i915_private *i915,
+		       struct intel_engine_cs *engine)
 {
 	llist_add((struct llist_node *)&engine->uabi_node,
-		  (struct llist_head *)&engine->i915->uabi_engines);
+		  (struct llist_head *)&i915->uabi_engines);
+}
+
+static void add_engines(struct drm_i915_private *i915)
+{
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+
+	for_each_engine(engine, i915, id)
+		add_engine(i915, engine);
 }
 
 static const u8 uabi_classes[] = {
@@ -190,6 +200,7 @@ void intel_engines_driver_register(struct drm_i915_private *i915)
 	struct rb_node **p, *prev;
 	LIST_HEAD(engines);
 
+	add_engines(i915);
 	sort_engines(i915, &engines);
 
 	prev = NULL;
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_user.h b/drivers/gpu/drm/i915/gt/intel_engine_user.h
index f845ea1cbfaa..7fb07fa98494 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_user.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_user.h
@@ -17,7 +17,6 @@ intel_engine_lookup_user(struct drm_i915_private *i915, u8 class, u8 instance);
 
 unsigned int intel_engines_has_context_isolation(struct drm_i915_private *i915);
 
-void intel_engine_add_user(struct intel_engine_cs *engine);
 void intel_engines_driver_register(struct drm_i915_private *i915);
 
 const char *intel_engine_class_repr(u8 class);
diff --git a/drivers/gpu/drm/i915/gt/mock_engine.c b/drivers/gpu/drm/i915/gt/mock_engine.c
index 83f549d203a0..c36490a00b5d 100644
--- a/drivers/gpu/drm/i915/gt/mock_engine.c
+++ b/drivers/gpu/drm/i915/gt/mock_engine.c
@@ -277,8 +277,6 @@ struct intel_engine_cs *mock_engine(struct drm_i915_private *i915,
 	timer_setup(&engine->hw_delay, hw_delay_complete, 0);
 	INIT_LIST_HEAD(&engine->hw_queue);
 
-	intel_engine_add_user(&engine->base);
-
 	return &engine->base;
 }
 
-- 
2.19.2