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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, fmt) \
18static ssize_t name##_show(struct device *dev, \
19 struct device_attribute *attr, char *buf) \
20{ \
21 return sysfs_emit(buf, fmt "\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, "%d");
46static DEVICE_ATTR_RO(physical_package_id);
47
48#ifdef TOPOLOGY_DIE_SYSFS
49define_id_show_func(die_id, "%d");
50static DEVICE_ATTR_RO(die_id);
51#endif
52
53#ifdef TOPOLOGY_CLUSTER_SYSFS
54define_id_show_func(cluster_id, "%d");
55static DEVICE_ATTR_RO(cluster_id);
56#endif
57
58define_id_show_func(core_id, "%d");
59static DEVICE_ATTR_RO(core_id);
60
61define_id_show_func(ppin, "0x%llx");
62static DEVICE_ATTR_ADMIN_RO(ppin);
63
64define_siblings_read_func(thread_siblings, sibling_cpumask);
65static BIN_ATTR_RO(thread_siblings, CPUMAP_FILE_MAX_BYTES);
66static BIN_ATTR_RO(thread_siblings_list, CPULIST_FILE_MAX_BYTES);
67
68define_siblings_read_func(core_cpus, sibling_cpumask);
69static BIN_ATTR_RO(core_cpus, CPUMAP_FILE_MAX_BYTES);
70static BIN_ATTR_RO(core_cpus_list, CPULIST_FILE_MAX_BYTES);
71
72define_siblings_read_func(core_siblings, core_cpumask);
73static BIN_ATTR_RO(core_siblings, CPUMAP_FILE_MAX_BYTES);
74static BIN_ATTR_RO(core_siblings_list, CPULIST_FILE_MAX_BYTES);
75
76#ifdef TOPOLOGY_CLUSTER_SYSFS
77define_siblings_read_func(cluster_cpus, cluster_cpumask);
78static BIN_ATTR_RO(cluster_cpus, CPUMAP_FILE_MAX_BYTES);
79static BIN_ATTR_RO(cluster_cpus_list, CPULIST_FILE_MAX_BYTES);
80#endif
81
82#ifdef TOPOLOGY_DIE_SYSFS
83define_siblings_read_func(die_cpus, die_cpumask);
84static BIN_ATTR_RO(die_cpus, CPUMAP_FILE_MAX_BYTES);
85static BIN_ATTR_RO(die_cpus_list, CPULIST_FILE_MAX_BYTES);
86#endif
87
88define_siblings_read_func(package_cpus, core_cpumask);
89static BIN_ATTR_RO(package_cpus, CPUMAP_FILE_MAX_BYTES);
90static BIN_ATTR_RO(package_cpus_list, CPULIST_FILE_MAX_BYTES);
91
92#ifdef TOPOLOGY_BOOK_SYSFS
93define_id_show_func(book_id, "%d");
94static DEVICE_ATTR_RO(book_id);
95define_siblings_read_func(book_siblings, book_cpumask);
96static BIN_ATTR_RO(book_siblings, CPUMAP_FILE_MAX_BYTES);
97static BIN_ATTR_RO(book_siblings_list, CPULIST_FILE_MAX_BYTES);
98#endif
99
100#ifdef TOPOLOGY_DRAWER_SYSFS
101define_id_show_func(drawer_id, "%d");
102static DEVICE_ATTR_RO(drawer_id);
103define_siblings_read_func(drawer_siblings, drawer_cpumask);
104static BIN_ATTR_RO(drawer_siblings, CPUMAP_FILE_MAX_BYTES);
105static BIN_ATTR_RO(drawer_siblings_list, CPULIST_FILE_MAX_BYTES);
106#endif
107
108static struct bin_attribute *bin_attrs[] = {
109 &bin_attr_core_cpus,
110 &bin_attr_core_cpus_list,
111 &bin_attr_thread_siblings,
112 &bin_attr_thread_siblings_list,
113 &bin_attr_core_siblings,
114 &bin_attr_core_siblings_list,
115#ifdef TOPOLOGY_CLUSTER_SYSFS
116 &bin_attr_cluster_cpus,
117 &bin_attr_cluster_cpus_list,
118#endif
119#ifdef TOPOLOGY_DIE_SYSFS
120 &bin_attr_die_cpus,
121 &bin_attr_die_cpus_list,
122#endif
123 &bin_attr_package_cpus,
124 &bin_attr_package_cpus_list,
125#ifdef TOPOLOGY_BOOK_SYSFS
126 &bin_attr_book_siblings,
127 &bin_attr_book_siblings_list,
128#endif
129#ifdef TOPOLOGY_DRAWER_SYSFS
130 &bin_attr_drawer_siblings,
131 &bin_attr_drawer_siblings_list,
132#endif
133 NULL
134};
135
136static struct attribute *default_attrs[] = {
137 &dev_attr_physical_package_id.attr,
138#ifdef TOPOLOGY_DIE_SYSFS
139 &dev_attr_die_id.attr,
140#endif
141#ifdef TOPOLOGY_CLUSTER_SYSFS
142 &dev_attr_cluster_id.attr,
143#endif
144 &dev_attr_core_id.attr,
145#ifdef TOPOLOGY_BOOK_SYSFS
146 &dev_attr_book_id.attr,
147#endif
148#ifdef TOPOLOGY_DRAWER_SYSFS
149 &dev_attr_drawer_id.attr,
150#endif
151 &dev_attr_ppin.attr,
152 NULL
153};
154
155static umode_t topology_is_visible(struct kobject *kobj,
156 struct attribute *attr, int unused)
157{
158 if (attr == &dev_attr_ppin.attr && !topology_ppin(kobj_to_dev(kobj)->id))
159 return 0;
160
161 return attr->mode;
162}
163
164static const struct attribute_group topology_attr_group = {
165 .attrs = default_attrs,
166 .bin_attrs = bin_attrs,
167 .is_visible = topology_is_visible,
168 .name = "topology"
169};
170
171/* Add/Remove cpu_topology interface for CPU device */
172static int topology_add_dev(unsigned int cpu)
173{
174 struct device *dev = get_cpu_device(cpu);
175
176 return sysfs_create_group(&dev->kobj, &topology_attr_group);
177}
178
179static int topology_remove_dev(unsigned int cpu)
180{
181 struct device *dev = get_cpu_device(cpu);
182
183 sysfs_remove_group(&dev->kobj, &topology_attr_group);
184 return 0;
185}
186
187static int __init topology_sysfs_init(void)
188{
189 return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
190 "base/topology:prepare", topology_add_dev,
191 topology_remove_dev);
192}
193
194device_initcall(topology_sysfs_init);
1/*
2 * driver/base/topology.c - Populate sysfs with cpu topology information
3 *
4 * Written by: Zhang Yanmin, Intel Corporation
5 *
6 * Copyright (C) 2006, Intel Corp.
7 *
8 * All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
18 * NON INFRINGEMENT. See the GNU General Public License for more
19 * details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 */
26#include <linux/mm.h>
27#include <linux/cpu.h>
28#include <linux/module.h>
29#include <linux/hardirq.h>
30#include <linux/topology.h>
31
32#define define_id_show_func(name) \
33static ssize_t name##_show(struct device *dev, \
34 struct device_attribute *attr, char *buf) \
35{ \
36 return sprintf(buf, "%d\n", topology_##name(dev->id)); \
37}
38
39#define define_siblings_show_map(name, mask) \
40static ssize_t name##_show(struct device *dev, \
41 struct device_attribute *attr, char *buf) \
42{ \
43 return cpumap_print_to_pagebuf(false, buf, topology_##mask(dev->id));\
44}
45
46#define define_siblings_show_list(name, mask) \
47static ssize_t name##_list_show(struct device *dev, \
48 struct device_attribute *attr, \
49 char *buf) \
50{ \
51 return cpumap_print_to_pagebuf(true, buf, topology_##mask(dev->id));\
52}
53
54#define define_siblings_show_func(name, mask) \
55 define_siblings_show_map(name, mask); \
56 define_siblings_show_list(name, mask)
57
58define_id_show_func(physical_package_id);
59static DEVICE_ATTR_RO(physical_package_id);
60
61define_id_show_func(core_id);
62static DEVICE_ATTR_RO(core_id);
63
64define_siblings_show_func(thread_siblings, sibling_cpumask);
65static DEVICE_ATTR_RO(thread_siblings);
66static DEVICE_ATTR_RO(thread_siblings_list);
67
68define_siblings_show_func(core_siblings, core_cpumask);
69static DEVICE_ATTR_RO(core_siblings);
70static DEVICE_ATTR_RO(core_siblings_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
80static struct attribute *default_attrs[] = {
81 &dev_attr_physical_package_id.attr,
82 &dev_attr_core_id.attr,
83 &dev_attr_thread_siblings.attr,
84 &dev_attr_thread_siblings_list.attr,
85 &dev_attr_core_siblings.attr,
86 &dev_attr_core_siblings_list.attr,
87#ifdef CONFIG_SCHED_BOOK
88 &dev_attr_book_id.attr,
89 &dev_attr_book_siblings.attr,
90 &dev_attr_book_siblings_list.attr,
91#endif
92 NULL
93};
94
95static struct attribute_group topology_attr_group = {
96 .attrs = default_attrs,
97 .name = "topology"
98};
99
100/* Add/Remove cpu_topology interface for CPU device */
101static int topology_add_dev(unsigned int cpu)
102{
103 struct device *dev = get_cpu_device(cpu);
104
105 return sysfs_create_group(&dev->kobj, &topology_attr_group);
106}
107
108static void topology_remove_dev(unsigned int cpu)
109{
110 struct device *dev = get_cpu_device(cpu);
111
112 sysfs_remove_group(&dev->kobj, &topology_attr_group);
113}
114
115static int topology_cpu_callback(struct notifier_block *nfb,
116 unsigned long action, void *hcpu)
117{
118 unsigned int cpu = (unsigned long)hcpu;
119 int rc = 0;
120
121 switch (action) {
122 case CPU_UP_PREPARE:
123 case CPU_UP_PREPARE_FROZEN:
124 rc = topology_add_dev(cpu);
125 break;
126 case CPU_UP_CANCELED:
127 case CPU_UP_CANCELED_FROZEN:
128 case CPU_DEAD:
129 case CPU_DEAD_FROZEN:
130 topology_remove_dev(cpu);
131 break;
132 }
133 return notifier_from_errno(rc);
134}
135
136static int topology_sysfs_init(void)
137{
138 int cpu;
139 int rc = 0;
140
141 cpu_notifier_register_begin();
142
143 for_each_online_cpu(cpu) {
144 rc = topology_add_dev(cpu);
145 if (rc)
146 goto out;
147 }
148 __hotcpu_notifier(topology_cpu_callback, 0);
149
150out:
151 cpu_notifier_register_done();
152 return rc;
153}
154
155device_initcall(topology_sysfs_init);