1b770bcfaSAndi Shyti // SPDX-License-Identifier: MIT
2b770bcfaSAndi Shyti /*
3b770bcfaSAndi Shyti * Copyright © 2022 Intel Corporation
4b770bcfaSAndi Shyti */
5b770bcfaSAndi Shyti
6b770bcfaSAndi Shyti #include <drm/drm_device.h>
7b770bcfaSAndi Shyti #include <linux/device.h>
8b770bcfaSAndi Shyti #include <linux/kobject.h>
9b770bcfaSAndi Shyti #include <linux/printk.h>
10b770bcfaSAndi Shyti #include <linux/sysfs.h>
11b770bcfaSAndi Shyti
12b770bcfaSAndi Shyti #include "i915_drv.h"
13b770bcfaSAndi Shyti #include "i915_sysfs.h"
14b770bcfaSAndi Shyti #include "intel_gt.h"
1567804e48SJohn Harrison #include "intel_gt_print.h"
16b770bcfaSAndi Shyti #include "intel_gt_sysfs.h"
1780cf8af1SAndi Shyti #include "intel_gt_sysfs_pm.h"
18b770bcfaSAndi Shyti #include "intel_gt_types.h"
19b770bcfaSAndi Shyti #include "intel_rc6.h"
20b770bcfaSAndi Shyti
is_object_gt(struct kobject * kobj)21b770bcfaSAndi Shyti bool is_object_gt(struct kobject *kobj)
22b770bcfaSAndi Shyti {
23b770bcfaSAndi Shyti return !strncmp(kobj->name, "gt", 2);
24b770bcfaSAndi Shyti }
25b770bcfaSAndi Shyti
intel_gt_sysfs_get_drvdata(struct kobject * kobj,const char * name)26a8a4f046SNathan Chancellor struct intel_gt *intel_gt_sysfs_get_drvdata(struct kobject *kobj,
27b770bcfaSAndi Shyti const char *name)
28b770bcfaSAndi Shyti {
29b770bcfaSAndi Shyti /*
30b770bcfaSAndi Shyti * We are interested at knowing from where the interface
31b770bcfaSAndi Shyti * has been called, whether it's called from gt/ or from
32b770bcfaSAndi Shyti * the parent directory.
33b770bcfaSAndi Shyti * From the interface position it depends also the value of
34b770bcfaSAndi Shyti * the private data.
35b770bcfaSAndi Shyti * If the interface is called from gt/ then private data is
36b770bcfaSAndi Shyti * of the "struct intel_gt *" type, otherwise it's * a
37b770bcfaSAndi Shyti * "struct drm_i915_private *" type.
38b770bcfaSAndi Shyti */
39b770bcfaSAndi Shyti if (!is_object_gt(kobj)) {
40a8a4f046SNathan Chancellor struct device *dev = kobj_to_dev(kobj);
41b770bcfaSAndi Shyti struct drm_i915_private *i915 = kdev_minor_to_i915(dev);
42b770bcfaSAndi Shyti
43b770bcfaSAndi Shyti return to_gt(i915);
44b770bcfaSAndi Shyti }
45b770bcfaSAndi Shyti
46b770bcfaSAndi Shyti return kobj_to_gt(kobj);
47b770bcfaSAndi Shyti }
48b770bcfaSAndi Shyti
gt_get_parent_obj(struct intel_gt * gt)4980cf8af1SAndi Shyti static struct kobject *gt_get_parent_obj(struct intel_gt *gt)
5080cf8af1SAndi Shyti {
5180cf8af1SAndi Shyti return >->i915->drm.primary->kdev->kobj;
5280cf8af1SAndi Shyti }
5380cf8af1SAndi Shyti
id_show(struct kobject * kobj,struct kobj_attribute * attr,char * buf)54a8a4f046SNathan Chancellor static ssize_t id_show(struct kobject *kobj,
55a8a4f046SNathan Chancellor struct kobj_attribute *attr,
56b770bcfaSAndi Shyti char *buf)
57b770bcfaSAndi Shyti {
58a8a4f046SNathan Chancellor struct intel_gt *gt = intel_gt_sysfs_get_drvdata(kobj, attr->attr.name);
59b770bcfaSAndi Shyti
60b770bcfaSAndi Shyti return sysfs_emit(buf, "%u\n", gt->info.id);
61b770bcfaSAndi Shyti }
62a8a4f046SNathan Chancellor static struct kobj_attribute attr_id = __ATTR_RO(id);
63b770bcfaSAndi Shyti
64b770bcfaSAndi Shyti static struct attribute *id_attrs[] = {
65a8a4f046SNathan Chancellor &attr_id.attr,
66b770bcfaSAndi Shyti NULL,
67b770bcfaSAndi Shyti };
68b770bcfaSAndi Shyti ATTRIBUTE_GROUPS(id);
69b770bcfaSAndi Shyti
7069d6bf5cSAshutosh Dixit /* A kobject needs a release() method even if it does nothing */
kobj_gt_release(struct kobject * kobj)71b770bcfaSAndi Shyti static void kobj_gt_release(struct kobject *kobj)
72b770bcfaSAndi Shyti {
73b770bcfaSAndi Shyti }
74b770bcfaSAndi Shyti
75*01361096SThomas Weißschuh static const struct kobj_type kobj_gt_type = {
76b770bcfaSAndi Shyti .release = kobj_gt_release,
77b770bcfaSAndi Shyti .sysfs_ops = &kobj_sysfs_ops,
78b770bcfaSAndi Shyti .default_groups = id_groups,
79b770bcfaSAndi Shyti };
80b770bcfaSAndi Shyti
intel_gt_sysfs_register(struct intel_gt * gt)81b770bcfaSAndi Shyti void intel_gt_sysfs_register(struct intel_gt *gt)
82b770bcfaSAndi Shyti {
8380cf8af1SAndi Shyti /*
8480cf8af1SAndi Shyti * We need to make things right with the
8580cf8af1SAndi Shyti * ABI compatibility. The files were originally
8680cf8af1SAndi Shyti * generated under the parent directory.
8780cf8af1SAndi Shyti *
8880cf8af1SAndi Shyti * We generate the files only for gt 0
8980cf8af1SAndi Shyti * to avoid duplicates.
9080cf8af1SAndi Shyti */
9180cf8af1SAndi Shyti if (gt_is_root(gt))
9280cf8af1SAndi Shyti intel_gt_sysfs_pm_init(gt, gt_get_parent_obj(gt));
9380cf8af1SAndi Shyti
9469d6bf5cSAshutosh Dixit /* init and xfer ownership to sysfs tree */
9569d6bf5cSAshutosh Dixit if (kobject_init_and_add(>->sysfs_gt, &kobj_gt_type,
9669d6bf5cSAshutosh Dixit gt->i915->sysfs_gt, "gt%d", gt->info.id))
97b770bcfaSAndi Shyti goto exit_fail;
98b770bcfaSAndi Shyti
995dca122fSAshutosh Dixit gt->sysfs_defaults = kobject_create_and_add(".defaults", >->sysfs_gt);
1005dca122fSAshutosh Dixit if (!gt->sysfs_defaults)
1015dca122fSAshutosh Dixit goto exit_fail;
1025dca122fSAshutosh Dixit
10369d6bf5cSAshutosh Dixit intel_gt_sysfs_pm_init(gt, >->sysfs_gt);
10480cf8af1SAndi Shyti
105b770bcfaSAndi Shyti return;
106b770bcfaSAndi Shyti
107b770bcfaSAndi Shyti exit_fail:
10869d6bf5cSAshutosh Dixit kobject_put(>->sysfs_gt);
10967804e48SJohn Harrison gt_warn(gt, "failed to initialize sysfs root\n");
110b770bcfaSAndi Shyti }
11169d6bf5cSAshutosh Dixit
intel_gt_sysfs_unregister(struct intel_gt * gt)11269d6bf5cSAshutosh Dixit void intel_gt_sysfs_unregister(struct intel_gt *gt)
11369d6bf5cSAshutosh Dixit {
1145dca122fSAshutosh Dixit kobject_put(gt->sysfs_defaults);
11569d6bf5cSAshutosh Dixit kobject_put(>->sysfs_gt);
11669d6bf5cSAshutosh Dixit }
117