[PATCH v1 12/14] drm/i915/gt: Isolate single sysfs engine file creation

[Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>]

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@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/gt/sysfs_engines.c | 76 ++++++++++++++++---------
 drivers/gpu/drm/i915/gt/sysfs_engines.h |  2 +
 2 files changed, 50 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/sysfs_engines.c b/drivers/gpu/drm/i915/gt/sysfs_engines.c
index f67f76df1cfe..fd1685f81505 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 {
@@ -481,7 +482,7 @@ static void add_defaults(struct kobj_engine *parent)
 		return;
 }
 
-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,
@@ -497,7 +498,50 @@ 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;
+
+	if (!kobj) {
+		kobj = kobj_engine(dir, engine);
+		if (!kobj) {
+			err = -EFAULT;
+			goto err_engine;
+		}
+	}
+
+	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_preempt_reset(engine)) {
+		err = sysfs_create_file(kobj, &preempt_timeout_attr.attr);
+		if (err)
+			goto err_object;
+	}
 
+	add_defaults(container_of(kobj, struct kobj_engine, base));
+
+	engine->kobj = kobj;
+
+	return 0;
+
+err_object:
+	kobject_put(kobj);
+err_engine:
+	gt_warn(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;
@@ -509,34 +553,10 @@ void intel_engines_add_sysfs(struct drm_i915_private *i915)
 	i915->sysfs_engine = dir;
 
 	for_each_uabi_engine(engine, i915) {
-		struct kobject *kobj;
-
-		kobj = kobj_engine(dir, engine);
-		if (!kobj)
-			goto err_engine;
-
-		if (sysfs_create_files(kobj, files))
-			goto err_object;
+		int err;
 
-		if (intel_engine_has_timeslices(engine) &&
-		    sysfs_create_file(kobj, &timeslice_duration_attr.attr))
-			goto err_engine;
-
-		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));
-
-		engine->kobj = kobj;
-
-		if (0) {
-err_object:
-			kobject_put(kobj);
-err_engine:
-			dev_err(kdev, "Failed to add sysfs engine '%s'\n",
-				engine->name);
+		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