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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_one_ro_named(_name, _func) \
33 static DEVICE_ATTR(_name, 0444, _func, NULL)
34
35#define define_one_ro(_name) \
36 static DEVICE_ATTR(_name, 0444, show_##_name, NULL)
37
38#define define_id_show_func(name) \
39static ssize_t show_##name(struct device *dev, \
40 struct device_attribute *attr, char *buf) \
41{ \
42 return sprintf(buf, "%d\n", topology_##name(dev->id)); \
43}
44
45#if defined(topology_thread_cpumask) || defined(topology_core_cpumask) || \
46 defined(topology_book_cpumask)
47static ssize_t show_cpumap(int type, const struct cpumask *mask, char *buf)
48{
49 ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
50 int n = 0;
51
52 if (len > 1) {
53 n = type?
54 cpulist_scnprintf(buf, len-2, mask) :
55 cpumask_scnprintf(buf, len-2, mask);
56 buf[n++] = '\n';
57 buf[n] = '\0';
58 }
59 return n;
60}
61#endif
62
63#define define_siblings_show_map(name) \
64static ssize_t show_##name(struct device *dev, \
65 struct device_attribute *attr, char *buf) \
66{ \
67 return show_cpumap(0, topology_##name(dev->id), buf); \
68}
69
70#define define_siblings_show_list(name) \
71static ssize_t show_##name##_list(struct device *dev, \
72 struct device_attribute *attr, \
73 char *buf) \
74{ \
75 return show_cpumap(1, topology_##name(dev->id), buf); \
76}
77
78#define define_siblings_show_func(name) \
79 define_siblings_show_map(name); define_siblings_show_list(name)
80
81define_id_show_func(physical_package_id);
82define_one_ro(physical_package_id);
83
84define_id_show_func(core_id);
85define_one_ro(core_id);
86
87define_siblings_show_func(thread_cpumask);
88define_one_ro_named(thread_siblings, show_thread_cpumask);
89define_one_ro_named(thread_siblings_list, show_thread_cpumask_list);
90
91define_siblings_show_func(core_cpumask);
92define_one_ro_named(core_siblings, show_core_cpumask);
93define_one_ro_named(core_siblings_list, show_core_cpumask_list);
94
95#ifdef CONFIG_SCHED_BOOK
96define_id_show_func(book_id);
97define_one_ro(book_id);
98define_siblings_show_func(book_cpumask);
99define_one_ro_named(book_siblings, show_book_cpumask);
100define_one_ro_named(book_siblings_list, show_book_cpumask_list);
101#endif
102
103static struct attribute *default_attrs[] = {
104 &dev_attr_physical_package_id.attr,
105 &dev_attr_core_id.attr,
106 &dev_attr_thread_siblings.attr,
107 &dev_attr_thread_siblings_list.attr,
108 &dev_attr_core_siblings.attr,
109 &dev_attr_core_siblings_list.attr,
110#ifdef CONFIG_SCHED_BOOK
111 &dev_attr_book_id.attr,
112 &dev_attr_book_siblings.attr,
113 &dev_attr_book_siblings_list.attr,
114#endif
115 NULL
116};
117
118static struct attribute_group topology_attr_group = {
119 .attrs = default_attrs,
120 .name = "topology"
121};
122
123/* Add/Remove cpu_topology interface for CPU device */
124static int topology_add_dev(unsigned int cpu)
125{
126 struct device *dev = get_cpu_device(cpu);
127
128 return sysfs_create_group(&dev->kobj, &topology_attr_group);
129}
130
131static void topology_remove_dev(unsigned int cpu)
132{
133 struct device *dev = get_cpu_device(cpu);
134
135 sysfs_remove_group(&dev->kobj, &topology_attr_group);
136}
137
138static int topology_cpu_callback(struct notifier_block *nfb,
139 unsigned long action, void *hcpu)
140{
141 unsigned int cpu = (unsigned long)hcpu;
142 int rc = 0;
143
144 switch (action) {
145 case CPU_UP_PREPARE:
146 case CPU_UP_PREPARE_FROZEN:
147 rc = topology_add_dev(cpu);
148 break;
149 case CPU_UP_CANCELED:
150 case CPU_UP_CANCELED_FROZEN:
151 case CPU_DEAD:
152 case CPU_DEAD_FROZEN:
153 topology_remove_dev(cpu);
154 break;
155 }
156 return notifier_from_errno(rc);
157}
158
159static int topology_sysfs_init(void)
160{
161 int cpu;
162 int rc = 0;
163
164 cpu_notifier_register_begin();
165
166 for_each_online_cpu(cpu) {
167 rc = topology_add_dev(cpu);
168 if (rc)
169 goto out;
170 }
171 __hotcpu_notifier(topology_cpu_callback, 0);
172
173out:
174 cpu_notifier_register_done();
175 return rc;
176}
177
178device_initcall(topology_sysfs_init);