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_read_func(name, mask) \
25 static ssize_t name##_read(struct file *file, struct kobject *kobj, \
26 struct bin_attribute *attr, char *buf, \
27 loff_t off, size_t count) \
28 { \
29 struct device *dev = kobj_to_dev(kobj); \
30 \
31 return cpumap_print_bitmask_to_buf(buf, topology_##mask(dev->id), \
32 off, count); \
33 } \
34 \
35 static ssize_t name##_list_read(struct file *file, struct kobject *kobj, \
36 struct bin_attribute *attr, char *buf, \
37 loff_t off, size_t count) \
38 { \
39 struct device *dev = kobj_to_dev(kobj); \
40 \
41 return cpumap_print_list_to_buf(buf, topology_##mask(dev->id), \
42 off, count); \
43 }
44
45 define_id_show_func(physical_package_id);
46 static DEVICE_ATTR_RO(physical_package_id);
47
48 define_id_show_func(die_id);
49 static DEVICE_ATTR_RO(die_id);
50
51 define_id_show_func(core_id);
52 static DEVICE_ATTR_RO(core_id);
53
54 define_siblings_read_func(thread_siblings, sibling_cpumask);
55 static BIN_ATTR_RO(thread_siblings, 0);
56 static BIN_ATTR_RO(thread_siblings_list, 0);
57
58 define_siblings_read_func(core_cpus, sibling_cpumask);
59 static BIN_ATTR_RO(core_cpus, 0);
60 static BIN_ATTR_RO(core_cpus_list, 0);
61
62 define_siblings_read_func(core_siblings, core_cpumask);
63 static BIN_ATTR_RO(core_siblings, 0);
64 static BIN_ATTR_RO(core_siblings_list, 0);
65
66 define_siblings_read_func(die_cpus, die_cpumask);
67 static BIN_ATTR_RO(die_cpus, 0);
68 static BIN_ATTR_RO(die_cpus_list, 0);
69
70 define_siblings_read_func(package_cpus, core_cpumask);
71 static BIN_ATTR_RO(package_cpus, 0);
72 static BIN_ATTR_RO(package_cpus_list, 0);
73
74 #ifdef CONFIG_SCHED_BOOK
75 define_id_show_func(book_id);
76 static DEVICE_ATTR_RO(book_id);
77 define_siblings_read_func(book_siblings, book_cpumask);
78 static BIN_ATTR_RO(book_siblings, 0);
79 static BIN_ATTR_RO(book_siblings_list, 0);
80 #endif
81
82 #ifdef CONFIG_SCHED_DRAWER
83 define_id_show_func(drawer_id);
84 static DEVICE_ATTR_RO(drawer_id);
85 define_siblings_read_func(drawer_siblings, drawer_cpumask);
86 static BIN_ATTR_RO(drawer_siblings, 0);
87 static BIN_ATTR_RO(drawer_siblings_list, 0);
88 #endif
89
90 static struct bin_attribute *bin_attrs[] = {
91 &bin_attr_core_cpus,
92 &bin_attr_core_cpus_list,
93 &bin_attr_thread_siblings,
94 &bin_attr_thread_siblings_list,
95 &bin_attr_core_siblings,
96 &bin_attr_core_siblings_list,
97 &bin_attr_die_cpus,
98 &bin_attr_die_cpus_list,
99 &bin_attr_package_cpus,
100 &bin_attr_package_cpus_list,
101 #ifdef CONFIG_SCHED_BOOK
102 &bin_attr_book_siblings,
103 &bin_attr_book_siblings_list,
104 #endif
105 #ifdef CONFIG_SCHED_DRAWER
106 &bin_attr_drawer_siblings,
107 &bin_attr_drawer_siblings_list,
108 #endif
109 NULL
110 };
111
112 static struct attribute *default_attrs[] = {
113 &dev_attr_physical_package_id.attr,
114 &dev_attr_die_id.attr,
115 &dev_attr_core_id.attr,
116 #ifdef CONFIG_SCHED_BOOK
117 &dev_attr_book_id.attr,
118 #endif
119 #ifdef CONFIG_SCHED_DRAWER
120 &dev_attr_drawer_id.attr,
121 #endif
122 NULL
123 };
124
125 static const struct attribute_group topology_attr_group = {
126 .attrs = default_attrs,
127 .bin_attrs = bin_attrs,
128 .name = "topology"
129 };
130
131 /* Add/Remove cpu_topology interface for CPU device */
topology_add_dev(unsigned int cpu)132 static int topology_add_dev(unsigned int cpu)
133 {
134 struct device *dev = get_cpu_device(cpu);
135
136 return sysfs_create_group(&dev->kobj, &topology_attr_group);
137 }
138
topology_remove_dev(unsigned int cpu)139 static int topology_remove_dev(unsigned int cpu)
140 {
141 struct device *dev = get_cpu_device(cpu);
142
143 sysfs_remove_group(&dev->kobj, &topology_attr_group);
144 return 0;
145 }
146
topology_sysfs_init(void)147 static int __init topology_sysfs_init(void)
148 {
149 return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
150 "base/topology:prepare", topology_add_dev,
151 topology_remove_dev);
152 }
153
154 device_initcall(topology_sysfs_init);
155
