1 files changed, 116 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_sysfs.c b/drivers/gpu/drm/i915/gt/intel_gt_sysfs.c
new file mode 100644
index 0000000000..33cba406b5
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/intel_gt_sysfs.c
@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include <drm/drm_device.h>
+#include <linux/device.h>
+#include <linux/kobject.h>
+#include <linux/printk.h>
+#include <linux/sysfs.h>
+
+#include "i915_drv.h"
+#include "i915_sysfs.h"
+#include "intel_gt.h"
+#include "intel_gt_print.h"
+#include "intel_gt_sysfs.h"
+#include "intel_gt_sysfs_pm.h"
+#include "intel_gt_types.h"
+#include "intel_rc6.h"
+
+bool is_object_gt(struct kobject *kobj)
+{
+	return !strncmp(kobj->name, "gt", 2);
+}
+
+struct intel_gt *intel_gt_sysfs_get_drvdata(struct kobject *kobj,
+					    const char *name)
+{
+	/*
+	 * We are interested at knowing from where the interface
+	 * has been called, whether it's called from gt/ or from
+	 * the parent directory.
+	 * From the interface position it depends also the value of
+	 * the private data.
+	 * If the interface is called from gt/ then private data is
+	 * of the "struct intel_gt *" type, otherwise it's * a
+	 * "struct drm_i915_private *" type.
+	 */
+	if (!is_object_gt(kobj)) {
+		struct device *dev = kobj_to_dev(kobj);
+		struct drm_i915_private *i915 = kdev_minor_to_i915(dev);
+
+		return to_gt(i915);
+	}
+
+	return kobj_to_gt(kobj);
+}
+
+static struct kobject *gt_get_parent_obj(struct intel_gt *gt)
+{
+	return &gt->i915->drm.primary->kdev->kobj;
+}
+
+static ssize_t id_show(struct kobject *kobj,
+		       struct kobj_attribute *attr,
+		       char *buf)
+{
+	struct intel_gt *gt = intel_gt_sysfs_get_drvdata(kobj, attr->attr.name);
+
+	return sysfs_emit(buf, "%u\n", gt->info.id);
+}
+static struct kobj_attribute attr_id = __ATTR_RO(id);
+
+static struct attribute *id_attrs[] = {
+	&attr_id.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(id);
+
+/* A kobject needs a release() method even if it does nothing */
+static void kobj_gt_release(struct kobject *kobj)
+{
+}
+
+static const struct kobj_type kobj_gt_type = {
+	.release = kobj_gt_release,
+	.sysfs_ops = &kobj_sysfs_ops,
+	.default_groups = id_groups,
+};
+
+void intel_gt_sysfs_register(struct intel_gt *gt)
+{
+	/*
+	 * We need to make things right with the
+	 * ABI compatibility. The files were originally
+	 * generated under the parent directory.
+	 *
+	 * We generate the files only for gt 0
+	 * to avoid duplicates.
+	 */
+	if (gt_is_root(gt))
+		intel_gt_sysfs_pm_init(gt, gt_get_parent_obj(gt));
+
+	/* init and xfer ownership to sysfs tree */
+	if (kobject_init_and_add(&gt->sysfs_gt, &kobj_gt_type,
+				 gt->i915->sysfs_gt, "gt%d", gt->info.id))
+		goto exit_fail;
+
+	gt->sysfs_defaults = kobject_create_and_add(".defaults", &gt->sysfs_gt);
+	if (!gt->sysfs_defaults)
+		goto exit_fail;
+
+	intel_gt_sysfs_pm_init(gt, &gt->sysfs_gt);
+
+	return;
+
+exit_fail:
+	kobject_put(&gt->sysfs_gt);
+	gt_warn(gt, "failed to initialize sysfs root\n");
+}
+
+void intel_gt_sysfs_unregister(struct intel_gt *gt)
+{
+	kobject_put(gt->sysfs_defaults);
+	kobject_put(&gt->sysfs_gt);
+}