Commit | Line | Data |
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69dcc991 ZY |
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 | */ | |
69dcc991 ZY |
26 | #include <linux/init.h> |
27 | #include <linux/mm.h> | |
28 | #include <linux/cpu.h> | |
29 | #include <linux/module.h> | |
b13d3720 | 30 | #include <linux/hardirq.h> |
69dcc991 ZY |
31 | #include <linux/topology.h> |
32 | ||
fbd59a8d | 33 | #define define_one_ro_named(_name, _func) \ |
8a25a2fd | 34 | static DEVICE_ATTR(_name, 0444, _func, NULL) |
fbd59a8d RR |
35 | |
36 | #define define_one_ro(_name) \ | |
8a25a2fd | 37 | static DEVICE_ATTR(_name, 0444, show_##_name, NULL) |
69dcc991 ZY |
38 | |
39 | #define define_id_show_func(name) \ | |
8a25a2fd KS |
40 | static ssize_t show_##name(struct device *dev, \ |
41 | struct device_attribute *attr, char *buf) \ | |
69dcc991 ZY |
42 | { \ |
43 | unsigned int cpu = dev->id; \ | |
44 | return sprintf(buf, "%d\n", topology_##name(cpu)); \ | |
45 | } | |
46 | ||
b40d8ed4 HC |
47 | #if defined(topology_thread_cpumask) || defined(topology_core_cpumask) || \ |
48 | defined(topology_book_cpumask) | |
fbd59a8d | 49 | static ssize_t show_cpumap(int type, const struct cpumask *mask, char *buf) |
39106dcf MT |
50 | { |
51 | ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf; | |
52 | int n = 0; | |
53 | ||
54 | if (len > 1) { | |
55 | n = type? | |
29c0177e RR |
56 | cpulist_scnprintf(buf, len-2, mask) : |
57 | cpumask_scnprintf(buf, len-2, mask); | |
39106dcf MT |
58 | buf[n++] = '\n'; |
59 | buf[n] = '\0'; | |
60 | } | |
61 | return n; | |
62 | } | |
23ca4bba | 63 | #endif |
39106dcf | 64 | |
23ca4bba | 65 | #ifdef arch_provides_topology_pointers |
39106dcf | 66 | #define define_siblings_show_map(name) \ |
8a25a2fd KS |
67 | static ssize_t show_##name(struct device *dev, \ |
68 | struct device_attribute *attr, char *buf) \ | |
39106dcf MT |
69 | { \ |
70 | unsigned int cpu = dev->id; \ | |
fbd59a8d | 71 | return show_cpumap(0, topology_##name(cpu), buf); \ |
39106dcf MT |
72 | } |
73 | ||
74 | #define define_siblings_show_list(name) \ | |
8a25a2fd KS |
75 | static ssize_t show_##name##_list(struct device *dev, \ |
76 | struct device_attribute *attr, \ | |
4a0b2b4d | 77 | char *buf) \ |
69dcc991 | 78 | { \ |
69dcc991 | 79 | unsigned int cpu = dev->id; \ |
fbd59a8d | 80 | return show_cpumap(1, topology_##name(cpu), buf); \ |
69dcc991 ZY |
81 | } |
82 | ||
23ca4bba MT |
83 | #else |
84 | #define define_siblings_show_map(name) \ | |
8a25a2fd KS |
85 | static ssize_t show_##name(struct device *dev, \ |
86 | struct device_attribute *attr, char *buf) \ | |
23ca4bba | 87 | { \ |
fbd59a8d | 88 | return show_cpumap(0, topology_##name(dev->id), buf); \ |
23ca4bba MT |
89 | } |
90 | ||
91 | #define define_siblings_show_list(name) \ | |
8a25a2fd KS |
92 | static ssize_t show_##name##_list(struct device *dev, \ |
93 | struct device_attribute *attr, \ | |
4a0b2b4d | 94 | char *buf) \ |
23ca4bba | 95 | { \ |
fbd59a8d | 96 | return show_cpumap(1, topology_##name(dev->id), buf); \ |
23ca4bba MT |
97 | } |
98 | #endif | |
99 | ||
39106dcf MT |
100 | #define define_siblings_show_func(name) \ |
101 | define_siblings_show_map(name); define_siblings_show_list(name) | |
102 | ||
69dcc991 ZY |
103 | define_id_show_func(physical_package_id); |
104 | define_one_ro(physical_package_id); | |
69dcc991 | 105 | |
69dcc991 ZY |
106 | define_id_show_func(core_id); |
107 | define_one_ro(core_id); | |
69dcc991 | 108 | |
fbd59a8d RR |
109 | define_siblings_show_func(thread_cpumask); |
110 | define_one_ro_named(thread_siblings, show_thread_cpumask); | |
111 | define_one_ro_named(thread_siblings_list, show_thread_cpumask_list); | |
69dcc991 | 112 | |
fbd59a8d RR |
113 | define_siblings_show_func(core_cpumask); |
114 | define_one_ro_named(core_siblings, show_core_cpumask); | |
115 | define_one_ro_named(core_siblings_list, show_core_cpumask_list); | |
69dcc991 | 116 | |
b40d8ed4 HC |
117 | #ifdef CONFIG_SCHED_BOOK |
118 | define_id_show_func(book_id); | |
119 | define_one_ro(book_id); | |
120 | define_siblings_show_func(book_cpumask); | |
121 | define_one_ro_named(book_siblings, show_book_cpumask); | |
122 | define_one_ro_named(book_siblings_list, show_book_cpumask_list); | |
123 | #endif | |
124 | ||
69dcc991 | 125 | static struct attribute *default_attrs[] = { |
8a25a2fd KS |
126 | &dev_attr_physical_package_id.attr, |
127 | &dev_attr_core_id.attr, | |
128 | &dev_attr_thread_siblings.attr, | |
129 | &dev_attr_thread_siblings_list.attr, | |
130 | &dev_attr_core_siblings.attr, | |
131 | &dev_attr_core_siblings_list.attr, | |
b40d8ed4 | 132 | #ifdef CONFIG_SCHED_BOOK |
8a25a2fd KS |
133 | &dev_attr_book_id.attr, |
134 | &dev_attr_book_siblings.attr, | |
135 | &dev_attr_book_siblings_list.attr, | |
b40d8ed4 | 136 | #endif |
69dcc991 ZY |
137 | NULL |
138 | }; | |
139 | ||
140 | static struct attribute_group topology_attr_group = { | |
141 | .attrs = default_attrs, | |
142 | .name = "topology" | |
143 | }; | |
144 | ||
145 | /* Add/Remove cpu_topology interface for CPU device */ | |
a83048eb | 146 | static int topology_add_dev(unsigned int cpu) |
69dcc991 | 147 | { |
8a25a2fd | 148 | struct device *dev = get_cpu_device(cpu); |
06a4bcae | 149 | |
8a25a2fd | 150 | return sysfs_create_group(&dev->kobj, &topology_attr_group); |
69dcc991 ZY |
151 | } |
152 | ||
a83048eb | 153 | static void topology_remove_dev(unsigned int cpu) |
69dcc991 | 154 | { |
8a25a2fd | 155 | struct device *dev = get_cpu_device(cpu); |
06a4bcae | 156 | |
8a25a2fd | 157 | sysfs_remove_group(&dev->kobj, &topology_attr_group); |
69dcc991 ZY |
158 | } |
159 | ||
a83048eb PG |
160 | static int topology_cpu_callback(struct notifier_block *nfb, |
161 | unsigned long action, void *hcpu) | |
69dcc991 ZY |
162 | { |
163 | unsigned int cpu = (unsigned long)hcpu; | |
06a4bcae | 164 | int rc = 0; |
69dcc991 | 165 | |
69dcc991 | 166 | switch (action) { |
06a4bcae | 167 | case CPU_UP_PREPARE: |
8bb78442 | 168 | case CPU_UP_PREPARE_FROZEN: |
06a4bcae | 169 | rc = topology_add_dev(cpu); |
69dcc991 | 170 | break; |
06a4bcae | 171 | case CPU_UP_CANCELED: |
8bb78442 | 172 | case CPU_UP_CANCELED_FROZEN: |
69dcc991 | 173 | case CPU_DEAD: |
8bb78442 | 174 | case CPU_DEAD_FROZEN: |
06a4bcae | 175 | topology_remove_dev(cpu); |
69dcc991 ZY |
176 | break; |
177 | } | |
ad84bb5b | 178 | return notifier_from_errno(rc); |
69dcc991 | 179 | } |
69dcc991 | 180 | |
a83048eb | 181 | static int topology_sysfs_init(void) |
69dcc991 | 182 | { |
06a4bcae HC |
183 | int cpu; |
184 | int rc; | |
69dcc991 | 185 | |
06a4bcae HC |
186 | for_each_online_cpu(cpu) { |
187 | rc = topology_add_dev(cpu); | |
188 | if (rc) | |
189 | return rc; | |
69dcc991 | 190 | } |
06a4bcae | 191 | hotcpu_notifier(topology_cpu_callback, 0); |
69dcc991 ZY |
192 | |
193 | return 0; | |
194 | } | |
195 | ||
196 | device_initcall(topology_sysfs_init); |