[RFC PATCH v2 09/11] drm/i915/gt: Isolate single sysfs engine file creation

[Andi Shyti <andi.shyti@linux.intel.com>]

In preparation for upcoming patches, we need the ability to
create and remove individual sysfs files. To facilitate this,
extract from the intel_engines_add_sysfs() function the creation
of individual files.

Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
---
 drivers/gpu/drm/i915/gt/sysfs_engines.c | 75 ++++++++++++++++---------
 drivers/gpu/drm/i915/gt/sysfs_engines.h |  2 +
 2 files changed, 49 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/sysfs_engines.c b/drivers/gpu/drm/i915/gt/sysfs_engines.c
index d0bb2aa561ed..3356fadce327 100644
--- a/drivers/gpu/drm/i915/gt/sysfs_engines.c
+++ b/drivers/gpu/drm/i915/gt/sysfs_engines.c
@@ -9,6 +9,7 @@
 #include "i915_drv.h"
 #include "intel_engine.h"
 #include "intel_engine_heartbeat.h"
+#include "intel_gt_print.h"
 #include "sysfs_engines.h"
 
 struct kobj_engine {
@@ -483,7 +484,7 @@ static void add_defaults(struct kobj_engine *parent)
 	parent->engine->kobj_defaults = &ke->base;
 }
 
-void intel_engines_add_sysfs(struct drm_i915_private *i915)
+int intel_engine_add_single_sysfs(struct intel_engine_cs *engine)
 {
 	static const struct attribute * const files[] = {
 		&name_attr.attr,
@@ -499,46 +500,64 @@ void intel_engines_add_sysfs(struct drm_i915_private *i915)
 #endif
 		NULL
 	};
+	struct kobject *dir = engine->i915->sysfs_engine;
+	struct kobject *kobj = engine->kobj;
+	int err;
 
-	struct device *kdev = i915->drm.primary->kdev;
-	struct intel_engine_cs *engine;
-	struct kobject *dir;
-
-	dir = kobject_create_and_add("engine", &kdev->kobj);
-	if (!dir)
-		return;
-
-	i915->sysfs_engine = dir;
-
-	for_each_uabi_engine(engine, i915) {
-		struct kobject *kobj;
-
+	if (!kobj) {
 		kobj = kobj_engine(dir, engine);
 		if (!kobj)
 			goto err_engine;
+	}
 
-		if (sysfs_create_files(kobj, files))
+	err = sysfs_create_files(kobj, files);
+	if (err)
+		goto err_object;
+
+	if (intel_engine_has_timeslices(engine)) {
+		err = sysfs_create_file(kobj, &timeslice_duration_attr.attr);
+		if (err)
 			goto err_object;
+	}
 
-		if (intel_engine_has_timeslices(engine) &&
-		    sysfs_create_file(kobj, &timeslice_duration_attr.attr))
-			goto err_engine;
+	if (intel_engine_has_preempt_reset(engine)) {
+		err = sysfs_create_file(kobj, &preempt_timeout_attr.attr);
+		if (err)
+			goto err_object;
+	}
 
-		if (intel_engine_has_preempt_reset(engine) &&
-		    sysfs_create_file(kobj, &preempt_timeout_attr.attr))
-			goto err_engine;
+	add_defaults(container_of(kobj, struct kobj_engine, base));
 
-		add_defaults(container_of(kobj, struct kobj_engine, base));
+	engine->kobj = kobj;
 
-		engine->kobj = kobj;
+	return 0;
 
-		if (0) {
 err_object:
-			kobject_put(kobj);
+	kobject_put(kobj);
 err_engine:
-			dev_err(kdev, "Failed to add sysfs engine '%s'\n",
-				engine->name);
+	gt_err(engine->gt, "Failed to add sysfs engine '%s'\n",
+		engine->name);
+
+	return err;
+}
+
+void intel_engines_add_sysfs(struct drm_i915_private *i915)
+{
+	struct device *kdev = i915->drm.primary->kdev;
+	struct intel_engine_cs *engine;
+	struct kobject *dir;
+
+	dir = kobject_create_and_add("engine", &kdev->kobj);
+	if (!dir)
+		return;
+
+	i915->sysfs_engine = dir;
+
+	for_each_uabi_engine(engine, i915) {
+		int err;
+
+		err = intel_engine_add_single_sysfs(engine);
+		if (err)
 			break;
-		}
 	}
 }
diff --git a/drivers/gpu/drm/i915/gt/sysfs_engines.h b/drivers/gpu/drm/i915/gt/sysfs_engines.h
index 9546fffe03a7..2e3ec2df14a9 100644
--- a/drivers/gpu/drm/i915/gt/sysfs_engines.h
+++ b/drivers/gpu/drm/i915/gt/sysfs_engines.h
@@ -7,7 +7,9 @@
 #define INTEL_ENGINE_SYSFS_H
 
 struct drm_i915_private;
+struct intel_engine_cs;
 
 void intel_engines_add_sysfs(struct drm_i915_private *i915);
+int intel_engine_add_single_sysfs(struct intel_engine_cs *engine);
 
 #endif /* INTEL_ENGINE_SYSFS_H */
-- 
2.45.2