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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/sysdev.h>
27#include <linux/init.h>
28#include <linux/mm.h>
29#include <linux/cpu.h>
30#include <linux/module.h>
31#include <linux/hardirq.h>
32#include <linux/topology.h>
33
34#define define_one_ro_named(_name, _func) \
35static SYSDEV_ATTR(_name, 0444, _func, NULL)
36
37#define define_one_ro(_name) \
38static SYSDEV_ATTR(_name, 0444, show_##_name, NULL)
39
40#define define_id_show_func(name) \
41static ssize_t show_##name(struct sys_device *dev, \
42 struct sysdev_attribute *attr, char *buf) \
43{ \
44 unsigned int cpu = dev->id; \
45 return sprintf(buf, "%d\n", topology_##name(cpu)); \
46}
47
48#if defined(topology_thread_cpumask) || defined(topology_core_cpumask) || \
49 defined(topology_book_cpumask)
50static ssize_t show_cpumap(int type, const struct cpumask *mask, char *buf)
51{
52 ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf;
53 int n = 0;
54
55 if (len > 1) {
56 n = type?
57 cpulist_scnprintf(buf, len-2, mask) :
58 cpumask_scnprintf(buf, len-2, mask);
59 buf[n++] = '\n';
60 buf[n] = '\0';
61 }
62 return n;
63}
64#endif
65
66#ifdef arch_provides_topology_pointers
67#define define_siblings_show_map(name) \
68static ssize_t show_##name(struct sys_device *dev, \
69 struct sysdev_attribute *attr, char *buf) \
70{ \
71 unsigned int cpu = dev->id; \
72 return show_cpumap(0, topology_##name(cpu), buf); \
73}
74
75#define define_siblings_show_list(name) \
76static ssize_t show_##name##_list(struct sys_device *dev, \
77 struct sysdev_attribute *attr, \
78 char *buf) \
79{ \
80 unsigned int cpu = dev->id; \
81 return show_cpumap(1, topology_##name(cpu), buf); \
82}
83
84#else
85#define define_siblings_show_map(name) \
86static ssize_t show_##name(struct sys_device *dev, \
87 struct sysdev_attribute *attr, char *buf) \
88{ \
89 return show_cpumap(0, topology_##name(dev->id), buf); \
90}
91
92#define define_siblings_show_list(name) \
93static ssize_t show_##name##_list(struct sys_device *dev, \
94 struct sysdev_attribute *attr, \
95 char *buf) \
96{ \
97 return show_cpumap(1, topology_##name(dev->id), buf); \
98}
99#endif
100
101#define define_siblings_show_func(name) \
102 define_siblings_show_map(name); define_siblings_show_list(name)
103
104define_id_show_func(physical_package_id);
105define_one_ro(physical_package_id);
106
107define_id_show_func(core_id);
108define_one_ro(core_id);
109
110define_siblings_show_func(thread_cpumask);
111define_one_ro_named(thread_siblings, show_thread_cpumask);
112define_one_ro_named(thread_siblings_list, show_thread_cpumask_list);
113
114define_siblings_show_func(core_cpumask);
115define_one_ro_named(core_siblings, show_core_cpumask);
116define_one_ro_named(core_siblings_list, show_core_cpumask_list);
117
118#ifdef CONFIG_SCHED_BOOK
119define_id_show_func(book_id);
120define_one_ro(book_id);
121define_siblings_show_func(book_cpumask);
122define_one_ro_named(book_siblings, show_book_cpumask);
123define_one_ro_named(book_siblings_list, show_book_cpumask_list);
124#endif
125
126static struct attribute *default_attrs[] = {
127 &attr_physical_package_id.attr,
128 &attr_core_id.attr,
129 &attr_thread_siblings.attr,
130 &attr_thread_siblings_list.attr,
131 &attr_core_siblings.attr,
132 &attr_core_siblings_list.attr,
133#ifdef CONFIG_SCHED_BOOK
134 &attr_book_id.attr,
135 &attr_book_siblings.attr,
136 &attr_book_siblings_list.attr,
137#endif
138 NULL
139};
140
141static struct attribute_group topology_attr_group = {
142 .attrs = default_attrs,
143 .name = "topology"
144};
145
146/* Add/Remove cpu_topology interface for CPU device */
147static int __cpuinit topology_add_dev(unsigned int cpu)
148{
149 struct sys_device *sys_dev = get_cpu_sysdev(cpu);
150
151 return sysfs_create_group(&sys_dev->kobj, &topology_attr_group);
152}
153
154static void __cpuinit topology_remove_dev(unsigned int cpu)
155{
156 struct sys_device *sys_dev = get_cpu_sysdev(cpu);
157
158 sysfs_remove_group(&sys_dev->kobj, &topology_attr_group);
159}
160
161static int __cpuinit topology_cpu_callback(struct notifier_block *nfb,
162 unsigned long action, void *hcpu)
163{
164 unsigned int cpu = (unsigned long)hcpu;
165 int rc = 0;
166
167 switch (action) {
168 case CPU_UP_PREPARE:
169 case CPU_UP_PREPARE_FROZEN:
170 rc = topology_add_dev(cpu);
171 break;
172 case CPU_UP_CANCELED:
173 case CPU_UP_CANCELED_FROZEN:
174 case CPU_DEAD:
175 case CPU_DEAD_FROZEN:
176 topology_remove_dev(cpu);
177 break;
178 }
179 return notifier_from_errno(rc);
180}
181
182static int __cpuinit topology_sysfs_init(void)
183{
184 int cpu;
185 int rc;
186
187 for_each_online_cpu(cpu) {
188 rc = topology_add_dev(cpu);
189 if (rc)
190 return rc;
191 }
192 hotcpu_notifier(topology_cpu_callback, 0);
193
194 return 0;
195}
196
197device_initcall(topology_sysfs_init);
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 const struct bin_attribute *attr, char *buf, \
27 loff_t off, size_t count) \
28{ \
29 struct device *dev = kobj_to_dev(kobj); \
30 cpumask_var_t mask; \
31 ssize_t n; \
32 \
33 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) \
34 return -ENOMEM; \
35 \
36 cpumask_copy(mask, topology_##mask(dev->id)); \
37 n = cpumap_print_bitmask_to_buf(buf, mask, off, count); \
38 free_cpumask_var(mask); \
39 \
40 return n; \
41} \
42 \
43static ssize_t name##_list_read(struct file *file, struct kobject *kobj, \
44 const struct bin_attribute *attr, char *buf, \
45 loff_t off, size_t count) \
46{ \
47 struct device *dev = kobj_to_dev(kobj); \
48 cpumask_var_t mask; \
49 ssize_t n; \
50 \
51 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) \
52 return -ENOMEM; \
53 \
54 cpumask_copy(mask, topology_##mask(dev->id)); \
55 n = cpumap_print_list_to_buf(buf, mask, off, count); \
56 free_cpumask_var(mask); \
57 \
58 return n; \
59}
60
61define_id_show_func(physical_package_id, "%d");
62static DEVICE_ATTR_RO(physical_package_id);
63
64#ifdef TOPOLOGY_DIE_SYSFS
65define_id_show_func(die_id, "%d");
66static DEVICE_ATTR_RO(die_id);
67#endif
68
69#ifdef TOPOLOGY_CLUSTER_SYSFS
70define_id_show_func(cluster_id, "%d");
71static DEVICE_ATTR_RO(cluster_id);
72#endif
73
74define_id_show_func(core_id, "%d");
75static DEVICE_ATTR_RO(core_id);
76
77define_id_show_func(ppin, "0x%llx");
78static DEVICE_ATTR_ADMIN_RO(ppin);
79
80define_siblings_read_func(thread_siblings, sibling_cpumask);
81static const BIN_ATTR_RO(thread_siblings, CPUMAP_FILE_MAX_BYTES);
82static const BIN_ATTR_RO(thread_siblings_list, CPULIST_FILE_MAX_BYTES);
83
84define_siblings_read_func(core_cpus, sibling_cpumask);
85static const BIN_ATTR_RO(core_cpus, CPUMAP_FILE_MAX_BYTES);
86static const BIN_ATTR_RO(core_cpus_list, CPULIST_FILE_MAX_BYTES);
87
88define_siblings_read_func(core_siblings, core_cpumask);
89static const BIN_ATTR_RO(core_siblings, CPUMAP_FILE_MAX_BYTES);
90static const BIN_ATTR_RO(core_siblings_list, CPULIST_FILE_MAX_BYTES);
91
92#ifdef TOPOLOGY_CLUSTER_SYSFS
93define_siblings_read_func(cluster_cpus, cluster_cpumask);
94static const BIN_ATTR_RO(cluster_cpus, CPUMAP_FILE_MAX_BYTES);
95static const BIN_ATTR_RO(cluster_cpus_list, CPULIST_FILE_MAX_BYTES);
96#endif
97
98#ifdef TOPOLOGY_DIE_SYSFS
99define_siblings_read_func(die_cpus, die_cpumask);
100static const BIN_ATTR_RO(die_cpus, CPUMAP_FILE_MAX_BYTES);
101static const BIN_ATTR_RO(die_cpus_list, CPULIST_FILE_MAX_BYTES);
102#endif
103
104define_siblings_read_func(package_cpus, core_cpumask);
105static const BIN_ATTR_RO(package_cpus, CPUMAP_FILE_MAX_BYTES);
106static const BIN_ATTR_RO(package_cpus_list, CPULIST_FILE_MAX_BYTES);
107
108#ifdef TOPOLOGY_BOOK_SYSFS
109define_id_show_func(book_id, "%d");
110static DEVICE_ATTR_RO(book_id);
111define_siblings_read_func(book_siblings, book_cpumask);
112static const BIN_ATTR_RO(book_siblings, CPUMAP_FILE_MAX_BYTES);
113static const BIN_ATTR_RO(book_siblings_list, CPULIST_FILE_MAX_BYTES);
114#endif
115
116#ifdef TOPOLOGY_DRAWER_SYSFS
117define_id_show_func(drawer_id, "%d");
118static DEVICE_ATTR_RO(drawer_id);
119define_siblings_read_func(drawer_siblings, drawer_cpumask);
120static const BIN_ATTR_RO(drawer_siblings, CPUMAP_FILE_MAX_BYTES);
121static const BIN_ATTR_RO(drawer_siblings_list, CPULIST_FILE_MAX_BYTES);
122#endif
123
124static const struct bin_attribute *const bin_attrs[] = {
125 &bin_attr_core_cpus,
126 &bin_attr_core_cpus_list,
127 &bin_attr_thread_siblings,
128 &bin_attr_thread_siblings_list,
129 &bin_attr_core_siblings,
130 &bin_attr_core_siblings_list,
131#ifdef TOPOLOGY_CLUSTER_SYSFS
132 &bin_attr_cluster_cpus,
133 &bin_attr_cluster_cpus_list,
134#endif
135#ifdef TOPOLOGY_DIE_SYSFS
136 &bin_attr_die_cpus,
137 &bin_attr_die_cpus_list,
138#endif
139 &bin_attr_package_cpus,
140 &bin_attr_package_cpus_list,
141#ifdef TOPOLOGY_BOOK_SYSFS
142 &bin_attr_book_siblings,
143 &bin_attr_book_siblings_list,
144#endif
145#ifdef TOPOLOGY_DRAWER_SYSFS
146 &bin_attr_drawer_siblings,
147 &bin_attr_drawer_siblings_list,
148#endif
149 NULL
150};
151
152static struct attribute *default_attrs[] = {
153 &dev_attr_physical_package_id.attr,
154#ifdef TOPOLOGY_DIE_SYSFS
155 &dev_attr_die_id.attr,
156#endif
157#ifdef TOPOLOGY_CLUSTER_SYSFS
158 &dev_attr_cluster_id.attr,
159#endif
160 &dev_attr_core_id.attr,
161#ifdef TOPOLOGY_BOOK_SYSFS
162 &dev_attr_book_id.attr,
163#endif
164#ifdef TOPOLOGY_DRAWER_SYSFS
165 &dev_attr_drawer_id.attr,
166#endif
167 &dev_attr_ppin.attr,
168 NULL
169};
170
171static umode_t topology_is_visible(struct kobject *kobj,
172 struct attribute *attr, int unused)
173{
174 if (attr == &dev_attr_ppin.attr && !topology_ppin(kobj_to_dev(kobj)->id))
175 return 0;
176
177 return attr->mode;
178}
179
180static const struct attribute_group topology_attr_group = {
181 .attrs = default_attrs,
182 .bin_attrs_new = bin_attrs,
183 .is_visible = topology_is_visible,
184 .name = "topology"
185};
186
187/* Add/Remove cpu_topology interface for CPU device */
188static int topology_add_dev(unsigned int cpu)
189{
190 struct device *dev = get_cpu_device(cpu);
191
192 return sysfs_create_group(&dev->kobj, &topology_attr_group);
193}
194
195static int topology_remove_dev(unsigned int cpu)
196{
197 struct device *dev = get_cpu_device(cpu);
198
199 sysfs_remove_group(&dev->kobj, &topology_attr_group);
200 return 0;
201}
202
203static int __init topology_sysfs_init(void)
204{
205 return cpuhp_setup_state(CPUHP_TOPOLOGY_PREPARE,
206 "base/topology:prepare", topology_add_dev,
207 topology_remove_dev);
208}
209
210device_initcall(topology_sysfs_init);