tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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_read_func(name, mask) \
25static 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 \
35static 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
45define_id_show_func(physical_package_id);
46static DEVICE_ATTR_RO(physical_package_id);
47
48define_id_show_func(die_id);
49static DEVICE_ATTR_RO(die_id);
50
51define_id_show_func(cluster_id);
52static DEVICE_ATTR_RO(cluster_id);
53
54define_id_show_func(core_id);
55static DEVICE_ATTR_RO(core_id);
56
57define_siblings_read_func(thread_siblings, sibling_cpumask);
58static BIN_ATTR_RO(thread_siblings, 0);
59static BIN_ATTR_RO(thread_siblings_list, 0);
60
61define_siblings_read_func(core_cpus, sibling_cpumask);
62static BIN_ATTR_RO(core_cpus, 0);
63static BIN_ATTR_RO(core_cpus_list, 0);
64
65define_siblings_read_func(core_siblings, core_cpumask);
66static BIN_ATTR_RO(core_siblings, 0);
67static BIN_ATTR_RO(core_siblings_list, 0);
68
69define_siblings_read_func(cluster_cpus, cluster_cpumask);
70static BIN_ATTR_RO(cluster_cpus, 0);
71static BIN_ATTR_RO(cluster_cpus_list, 0);
72
73define_siblings_read_func(die_cpus, die_cpumask);
74static BIN_ATTR_RO(die_cpus, 0);
75static BIN_ATTR_RO(die_cpus_list, 0);
76
77define_siblings_read_func(package_cpus, core_cpumask);
78static BIN_ATTR_RO(package_cpus, 0);
79static BIN_ATTR_RO(package_cpus_list, 0);
80
81#ifdef CONFIG_SCHED_BOOK
82define_id_show_func(book_id);
83static DEVICE_ATTR_RO(book_id);
84define_siblings_read_func(book_siblings, book_cpumask);
85static BIN_ATTR_RO(book_siblings, 0);
86static BIN_ATTR_RO(book_siblings_list, 0);
87#endif
88
89#ifdef CONFIG_SCHED_DRAWER
90define_id_show_func(drawer_id);
91static DEVICE_ATTR_RO(drawer_id);
92define_siblings_read_func(drawer_siblings, drawer_cpumask);
93static BIN_ATTR_RO(drawer_siblings, 0);
94static BIN_ATTR_RO(drawer_siblings_list, 0);
95#endif
96
97static struct bin_attribute *bin_attrs[] = {
98 &bin_attr_core_cpus,
99 &bin_attr_core_cpus_list,
100 &bin_attr_thread_siblings,
101 &bin_attr_thread_siblings_list,
102 &bin_attr_core_siblings,
103 &bin_attr_core_siblings_list,
104 &bin_attr_cluster_cpus,
105 &bin_attr_cluster_cpus_list,
106 &bin_attr_die_cpus,
107 &bin_attr_die_cpus_list,
108 &bin_attr_package_cpus,
109 &bin_attr_package_cpus_list,
110#ifdef CONFIG_SCHED_BOOK
111 &bin_attr_book_siblings,
112 &bin_attr_book_siblings_list,
113#endif
114#ifdef CONFIG_SCHED_DRAWER
115 &bin_attr_drawer_siblings,
116 &bin_attr_drawer_siblings_list,
117#endif
118 NULL
119};
120
121static struct attribute *default_attrs[] = {
122 &dev_attr_physical_package_id.attr,
123 &dev_attr_die_id.attr,
124 &dev_attr_cluster_id.attr,
125 &dev_attr_core_id.attr,
126#ifdef CONFIG_SCHED_BOOK
127 &dev_attr_book_id.attr,
128#endif
129#ifdef CONFIG_SCHED_DRAWER
130 &dev_attr_drawer_id.attr,
131#endif
132 NULL
133};
134
135static const struct attribute_group topology_attr_group = {
136 .attrs = default_attrs,
137 .bin_attrs = bin_attrs,
138 .name = "topology"
139};
140
141/* Add/Remove cpu_topology interface for CPU device */
142static int topology_add_dev(unsigned int cpu)
143{
144 struct device *dev = get_cpu_device(cpu);
145
146 return sysfs_create_group(&dev->kobj, &topology_attr_group);
147}
148
149static int topology_remove_dev(unsigned int cpu)
150{
151 struct device *dev = get_cpu_device(cpu);
152
153 sysfs_remove_group(&dev->kobj, &topology_attr_group);
154 return 0;
155}
156
157static int __init topology_sysfs_init(void)
158{
159 return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
160 "base/topology:prepare", topology_add_dev,
161 topology_remove_dev);
162}
163
164device_initcall(topology_sysfs_init);