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) \
18 static 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) \
25 static 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) \
32 static 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
43 define_id_show_func(physical_package_id);
44 static DEVICE_ATTR_RO(physical_package_id);
45
46 define_id_show_func(die_id);
47 static DEVICE_ATTR_RO(die_id);
48
49 define_id_show_func(core_id);
50 static DEVICE_ATTR_RO(core_id);
51
52 define_siblings_show_func(thread_siblings, sibling_cpumask);
53 static DEVICE_ATTR_RO(thread_siblings);
54 static DEVICE_ATTR_RO(thread_siblings_list);
55
56 define_siblings_show_func(core_cpus, sibling_cpumask);
57 static DEVICE_ATTR_RO(core_cpus);
58 static DEVICE_ATTR_RO(core_cpus_list);
59
60 define_siblings_show_func(core_siblings, core_cpumask);
61 static DEVICE_ATTR_RO(core_siblings);
62 static DEVICE_ATTR_RO(core_siblings_list);
63
64 define_siblings_show_func(die_cpus, die_cpumask);
65 static DEVICE_ATTR_RO(die_cpus);
66 static DEVICE_ATTR_RO(die_cpus_list);
67
68 define_siblings_show_func(package_cpus, core_cpumask);
69 static DEVICE_ATTR_RO(package_cpus);
70 static DEVICE_ATTR_RO(package_cpus_list);
71
72 #ifdef CONFIG_SCHED_BOOK
73 define_id_show_func(book_id);
74 static DEVICE_ATTR_RO(book_id);
75 define_siblings_show_func(book_siblings, book_cpumask);
76 static DEVICE_ATTR_RO(book_siblings);
77 static DEVICE_ATTR_RO(book_siblings_list);
78 #endif
79
80 #ifdef CONFIG_SCHED_DRAWER
81 define_id_show_func(drawer_id);
82 static DEVICE_ATTR_RO(drawer_id);
83 define_siblings_show_func(drawer_siblings, drawer_cpumask);
84 static DEVICE_ATTR_RO(drawer_siblings);
85 static DEVICE_ATTR_RO(drawer_siblings_list);
86 #endif
87
88 static 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
115 static 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 */
topology_add_dev(unsigned int cpu)121 static 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
topology_remove_dev(unsigned int cpu)128 static 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
topology_sysfs_init(void)136 static 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
143 device_initcall(topology_sysfs_init);
144