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
48#ifdef TOPOLOGY_DIE_SYSFS
49define_id_show_func(die_id);
50static DEVICE_ATTR_RO(die_id);
51#endif
52
53#ifdef TOPOLOGY_CLUSTER_SYSFS
54define_id_show_func(cluster_id);
55static DEVICE_ATTR_RO(cluster_id);
56#endif
57
58define_id_show_func(core_id);
59static DEVICE_ATTR_RO(core_id);
60
61define_siblings_read_func(thread_siblings, sibling_cpumask);
62static BIN_ATTR_RO(thread_siblings, 0);
63static BIN_ATTR_RO(thread_siblings_list, 0);
64
65define_siblings_read_func(core_cpus, sibling_cpumask);
66static BIN_ATTR_RO(core_cpus, 0);
67static BIN_ATTR_RO(core_cpus_list, 0);
68
69define_siblings_read_func(core_siblings, core_cpumask);
70static BIN_ATTR_RO(core_siblings, 0);
71static BIN_ATTR_RO(core_siblings_list, 0);
72
73#ifdef TOPOLOGY_CLUSTER_SYSFS
74define_siblings_read_func(cluster_cpus, cluster_cpumask);
75static BIN_ATTR_RO(cluster_cpus, 0);
76static BIN_ATTR_RO(cluster_cpus_list, 0);
77#endif
78
79#ifdef TOPOLOGY_DIE_SYSFS
80define_siblings_read_func(die_cpus, die_cpumask);
81static BIN_ATTR_RO(die_cpus, 0);
82static BIN_ATTR_RO(die_cpus_list, 0);
83#endif
84
85define_siblings_read_func(package_cpus, core_cpumask);
86static BIN_ATTR_RO(package_cpus, 0);
87static BIN_ATTR_RO(package_cpus_list, 0);
88
89#ifdef TOPOLOGY_BOOK_SYSFS
90define_id_show_func(book_id);
91static DEVICE_ATTR_RO(book_id);
92define_siblings_read_func(book_siblings, book_cpumask);
93static BIN_ATTR_RO(book_siblings, 0);
94static BIN_ATTR_RO(book_siblings_list, 0);
95#endif
96
97#ifdef TOPOLOGY_DRAWER_SYSFS
98define_id_show_func(drawer_id);
99static DEVICE_ATTR_RO(drawer_id);
100define_siblings_read_func(drawer_siblings, drawer_cpumask);
101static BIN_ATTR_RO(drawer_siblings, 0);
102static BIN_ATTR_RO(drawer_siblings_list, 0);
103#endif
104
105static struct bin_attribute *bin_attrs[] = {
106 &bin_attr_core_cpus,
107 &bin_attr_core_cpus_list,
108 &bin_attr_thread_siblings,
109 &bin_attr_thread_siblings_list,
110 &bin_attr_core_siblings,
111 &bin_attr_core_siblings_list,
112#ifdef TOPOLOGY_CLUSTER_SYSFS
113 &bin_attr_cluster_cpus,
114 &bin_attr_cluster_cpus_list,
115#endif
116#ifdef TOPOLOGY_DIE_SYSFS
117 &bin_attr_die_cpus,
118 &bin_attr_die_cpus_list,
119#endif
120 &bin_attr_package_cpus,
121 &bin_attr_package_cpus_list,
122#ifdef TOPOLOGY_BOOK_SYSFS
123 &bin_attr_book_siblings,
124 &bin_attr_book_siblings_list,
125#endif
126#ifdef TOPOLOGY_DRAWER_SYSFS
127 &bin_attr_drawer_siblings,
128 &bin_attr_drawer_siblings_list,
129#endif
130 NULL
131};
132
133static struct attribute *default_attrs[] = {
134 &dev_attr_physical_package_id.attr,
135#ifdef TOPOLOGY_DIE_SYSFS
136 &dev_attr_die_id.attr,
137#endif
138#ifdef TOPOLOGY_CLUSTER_SYSFS
139 &dev_attr_cluster_id.attr,
140#endif
141 &dev_attr_core_id.attr,
142#ifdef TOPOLOGY_BOOK_SYSFS
143 &dev_attr_book_id.attr,
144#endif
145#ifdef TOPOLOGY_DRAWER_SYSFS
146 &dev_attr_drawer_id.attr,
147#endif
148 NULL
149};
150
151static const struct attribute_group topology_attr_group = {
152 .attrs = default_attrs,
153 .bin_attrs = bin_attrs,
154 .name = "topology"
155};
156
157/* Add/Remove cpu_topology interface for CPU device */
158static int topology_add_dev(unsigned int cpu)
159{
160 struct device *dev = get_cpu_device(cpu);
161
162 return sysfs_create_group(&dev->kobj, &topology_attr_group);
163}
164
165static int topology_remove_dev(unsigned int cpu)
166{
167 struct device *dev = get_cpu_device(cpu);
168
169 sysfs_remove_group(&dev->kobj, &topology_attr_group);
170 return 0;
171}
172
173static int __init topology_sysfs_init(void)
174{
175 return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
176 "base/topology:prepare", topology_add_dev,
177 topology_remove_dev);
178}
179
180device_initcall(topology_sysfs_init);