1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * driver/base/topology.c - Populate sysfs with cpu topology information
4 *
5 * Written by: Zhang Yanmin, Intel Corporation
6 *
7 * Copyright (C) 2006, Intel Corp.
8 *
9 * All rights reserved.
10 */
11#include <linux/mm.h>
12#include <linux/cpu.h>
13#include <linux/module.h>
14#include <linux/hardirq.h>
15#include <linux/topology.h>
16
17#define define_id_show_func(name)					\
18static ssize_t name##_show(struct device *dev,				\
19			   struct device_attribute *attr, char *buf)	\
20{									\
21	return sysfs_emit(buf, "%d\n", topology_##name(dev->id));	\
22}
23
24#define define_siblings_show_map(name, mask)				\
25static ssize_t name##_show(struct device *dev,				\
26			   struct device_attribute *attr, char *buf)	\
27{									\
28	return cpumap_print_to_pagebuf(false, buf, topology_##mask(dev->id));\
29}
30
31#define define_siblings_show_list(name, mask)				\
32static ssize_t name##_list_show(struct device *dev,			\
33				struct device_attribute *attr,		\
34				char *buf)				\
35{									\
36	return cpumap_print_to_pagebuf(true, buf, topology_##mask(dev->id));\
37}
38
39#define define_siblings_show_func(name, mask)	\
40	define_siblings_show_map(name, mask);	\
41	define_siblings_show_list(name, mask)
42
43define_id_show_func(physical_package_id);
44static DEVICE_ATTR_RO(physical_package_id);
45
46define_id_show_func(die_id);
47static DEVICE_ATTR_RO(die_id);
48
49define_id_show_func(core_id);
50static DEVICE_ATTR_RO(core_id);
51
52define_siblings_show_func(thread_siblings, sibling_cpumask);
53static DEVICE_ATTR_RO(thread_siblings);
54static DEVICE_ATTR_RO(thread_siblings_list);
55
56define_siblings_show_func(core_cpus, sibling_cpumask);
57static DEVICE_ATTR_RO(core_cpus);
58static DEVICE_ATTR_RO(core_cpus_list);
59
60define_siblings_show_func(core_siblings, core_cpumask);
61static DEVICE_ATTR_RO(core_siblings);
62static DEVICE_ATTR_RO(core_siblings_list);
63
64define_siblings_show_func(die_cpus, die_cpumask);
65static DEVICE_ATTR_RO(die_cpus);
66static DEVICE_ATTR_RO(die_cpus_list);
67
68define_siblings_show_func(package_cpus, core_cpumask);
69static DEVICE_ATTR_RO(package_cpus);
70static DEVICE_ATTR_RO(package_cpus_list);
71
72#ifdef CONFIG_SCHED_BOOK
73define_id_show_func(book_id);
74static DEVICE_ATTR_RO(book_id);
75define_siblings_show_func(book_siblings, book_cpumask);
76static DEVICE_ATTR_RO(book_siblings);
77static DEVICE_ATTR_RO(book_siblings_list);
78#endif
79
80#ifdef CONFIG_SCHED_DRAWER
81define_id_show_func(drawer_id);
82static DEVICE_ATTR_RO(drawer_id);
83define_siblings_show_func(drawer_siblings, drawer_cpumask);
84static DEVICE_ATTR_RO(drawer_siblings);
85static DEVICE_ATTR_RO(drawer_siblings_list);
86#endif
87
88static struct attribute *default_attrs[] = {
89	&dev_attr_physical_package_id.attr,
90	&dev_attr_die_id.attr,
91	&dev_attr_core_id.attr,
92	&dev_attr_thread_siblings.attr,
93	&dev_attr_thread_siblings_list.attr,
94	&dev_attr_core_cpus.attr,
95	&dev_attr_core_cpus_list.attr,
96	&dev_attr_core_siblings.attr,
97	&dev_attr_core_siblings_list.attr,
98	&dev_attr_die_cpus.attr,
99	&dev_attr_die_cpus_list.attr,
100	&dev_attr_package_cpus.attr,
101	&dev_attr_package_cpus_list.attr,
102#ifdef CONFIG_SCHED_BOOK
103	&dev_attr_book_id.attr,
104	&dev_attr_book_siblings.attr,
105	&dev_attr_book_siblings_list.attr,
106#endif
107#ifdef CONFIG_SCHED_DRAWER
108	&dev_attr_drawer_id.attr,
109	&dev_attr_drawer_siblings.attr,
110	&dev_attr_drawer_siblings_list.attr,
111#endif
112	NULL
113};
114
115static const struct attribute_group topology_attr_group = {
116	.attrs = default_attrs,
117	.name = "topology"
118};
119
120/* Add/Remove cpu_topology interface for CPU device */
121static int topology_add_dev(unsigned int cpu)
122{
123	struct device *dev = get_cpu_device(cpu);
124
125	return sysfs_create_group(&dev->kobj, &topology_attr_group);
126}
127
128static int topology_remove_dev(unsigned int cpu)
129{
130	struct device *dev = get_cpu_device(cpu);
131
132	sysfs_remove_group(&dev->kobj, &topology_attr_group);
133	return 0;
134}
135
136static int __init topology_sysfs_init(void)
137{
138	return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
139				 "base/topology:prepare", topology_add_dev,
140				 topology_remove_dev);
141}
142
143device_initcall(topology_sysfs_init);
144