1// SPDX-License-Identifier: MIT
2/*
3 * Copyright �� 2022 Intel Corporation
4 */
5
6#include <drm/drm_device.h>
7#include <linux/device.h>
8#include <linux/kobject.h>
9#include <linux/printk.h>
10#include <linux/sysfs.h>
11
12#include "i915_drv.h"
13#include "i915_sysfs.h"
14#include "intel_gt.h"
15#include "intel_gt_print.h"
16#include "intel_gt_sysfs.h"
17#include "intel_gt_sysfs_pm.h"
18#include "intel_gt_types.h"
19#include "intel_rc6.h"
20
21#ifdef notyet
22
23bool is_object_gt(struct kobject *kobj)
24{
25	return !strncmp(kobj->name, "gt", 2);
26}
27
28struct intel_gt *intel_gt_sysfs_get_drvdata(struct kobject *kobj,
29					    const char *name)
30{
31	/*
32	 * We are interested at knowing from where the interface
33	 * has been called, whether it's called from gt/ or from
34	 * the parent directory.
35	 * From the interface position it depends also the value of
36	 * the private data.
37	 * If the interface is called from gt/ then private data is
38	 * of the "struct intel_gt *" type, otherwise it's * a
39	 * "struct drm_i915_private *" type.
40	 */
41	if (!is_object_gt(kobj)) {
42		struct device *dev = kobj_to_dev(kobj);
43		struct drm_i915_private *i915 = kdev_minor_to_i915(dev);
44
45		return to_gt(i915);
46	}
47
48	return kobj_to_gt(kobj);
49}
50
51static struct kobject *gt_get_parent_obj(struct intel_gt *gt)
52{
53	return &gt->i915->drm.primary->kdev->kobj;
54}
55
56static ssize_t id_show(struct kobject *kobj,
57		       struct kobj_attribute *attr,
58		       char *buf)
59{
60	struct intel_gt *gt = intel_gt_sysfs_get_drvdata(kobj, attr->attr.name);
61
62	return sysfs_emit(buf, "%u\n", gt->info.id);
63}
64static struct kobj_attribute attr_id = __ATTR_RO(id);
65
66static struct attribute *id_attrs[] = {
67	&attr_id.attr,
68	NULL,
69};
70ATTRIBUTE_GROUPS(id);
71
72/* A kobject needs a release() method even if it does nothing */
73static void kobj_gt_release(struct kobject *kobj)
74{
75}
76
77static const struct kobj_type kobj_gt_type = {
78	.release = kobj_gt_release,
79	.sysfs_ops = &kobj_sysfs_ops,
80	.default_groups = id_groups,
81};
82
83#endif /* notyet */
84
85void intel_gt_sysfs_register(struct intel_gt *gt)
86{
87#ifdef notyet
88	/*
89	 * We need to make things right with the
90	 * ABI compatibility. The files were originally
91	 * generated under the parent directory.
92	 *
93	 * We generate the files only for gt 0
94	 * to avoid duplicates.
95	 */
96	if (gt_is_root(gt))
97		intel_gt_sysfs_pm_init(gt, gt_get_parent_obj(gt));
98
99	/* init and xfer ownership to sysfs tree */
100	if (kobject_init_and_add(&gt->sysfs_gt, &kobj_gt_type,
101				 gt->i915->sysfs_gt, "gt%d", gt->info.id))
102		goto exit_fail;
103
104	gt->sysfs_defaults = kobject_create_and_add(".defaults", &gt->sysfs_gt);
105	if (!gt->sysfs_defaults)
106		goto exit_fail;
107
108	intel_gt_sysfs_pm_init(gt, &gt->sysfs_gt);
109
110	return;
111
112exit_fail:
113	kobject_put(&gt->sysfs_gt);
114	gt_warn(gt, "failed to initialize sysfs root\n");
115#endif
116}
117
118void intel_gt_sysfs_unregister(struct intel_gt *gt)
119{
120#ifdef notyet
121	kobject_put(gt->sysfs_defaults);
122	kobject_put(&gt->sysfs_gt);
123#endif
124}
125