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 | #define define_siblings_show_map(name) \ |
8a25a2fd KS |
66 | static ssize_t show_##name(struct device *dev, \ |
67 | struct device_attribute *attr, char *buf) \ | |
23ca4bba | 68 | { \ |
fbd59a8d | 69 | return show_cpumap(0, topology_##name(dev->id), buf); \ |
23ca4bba MT |
70 | } |
71 | ||
72 | #define define_siblings_show_list(name) \ | |
8a25a2fd KS |
73 | static ssize_t show_##name##_list(struct device *dev, \ |
74 | struct device_attribute *attr, \ | |
4a0b2b4d | 75 | char *buf) \ |
23ca4bba | 76 | { \ |
fbd59a8d | 77 | return show_cpumap(1, topology_##name(dev->id), buf); \ |
23ca4bba | 78 | } |
23ca4bba | 79 | |
39106dcf MT |
80 | #define define_siblings_show_func(name) \ |
81 | define_siblings_show_map(name); define_siblings_show_list(name) | |
82 | ||
69dcc991 ZY |
83 | define_id_show_func(physical_package_id); |
84 | define_one_ro(physical_package_id); | |
69dcc991 | 85 | |
69dcc991 ZY |
86 | define_id_show_func(core_id); |
87 | define_one_ro(core_id); | |
69dcc991 | 88 | |
fbd59a8d RR |
89 | define_siblings_show_func(thread_cpumask); |
90 | define_one_ro_named(thread_siblings, show_thread_cpumask); | |
91 | define_one_ro_named(thread_siblings_list, show_thread_cpumask_list); | |
69dcc991 | 92 | |
fbd59a8d RR |
93 | define_siblings_show_func(core_cpumask); |
94 | define_one_ro_named(core_siblings, show_core_cpumask); | |
95 | define_one_ro_named(core_siblings_list, show_core_cpumask_list); | |
69dcc991 | 96 | |
b40d8ed4 HC |
97 | #ifdef CONFIG_SCHED_BOOK |
98 | define_id_show_func(book_id); | |
99 | define_one_ro(book_id); | |
100 | define_siblings_show_func(book_cpumask); | |
101 | define_one_ro_named(book_siblings, show_book_cpumask); | |
102 | define_one_ro_named(book_siblings_list, show_book_cpumask_list); | |
103 | #endif | |
104 | ||
69dcc991 | 105 | static struct attribute *default_attrs[] = { |
8a25a2fd KS |
106 | &dev_attr_physical_package_id.attr, |
107 | &dev_attr_core_id.attr, | |
108 | &dev_attr_thread_siblings.attr, | |
109 | &dev_attr_thread_siblings_list.attr, | |
110 | &dev_attr_core_siblings.attr, | |
111 | &dev_attr_core_siblings_list.attr, | |
b40d8ed4 | 112 | #ifdef CONFIG_SCHED_BOOK |
8a25a2fd KS |
113 | &dev_attr_book_id.attr, |
114 | &dev_attr_book_siblings.attr, | |
115 | &dev_attr_book_siblings_list.attr, | |
b40d8ed4 | 116 | #endif |
69dcc991 ZY |
117 | NULL |
118 | }; | |
119 | ||
120 | static struct attribute_group topology_attr_group = { | |
121 | .attrs = default_attrs, | |
122 | .name = "topology" | |
123 | }; | |
124 | ||
125 | /* Add/Remove cpu_topology interface for CPU device */ | |
a83048eb | 126 | static int topology_add_dev(unsigned int cpu) |
69dcc991 | 127 | { |
8a25a2fd | 128 | struct device *dev = get_cpu_device(cpu); |
06a4bcae | 129 | |
8a25a2fd | 130 | return sysfs_create_group(&dev->kobj, &topology_attr_group); |
69dcc991 ZY |
131 | } |
132 | ||
a83048eb | 133 | static void topology_remove_dev(unsigned int cpu) |
69dcc991 | 134 | { |
8a25a2fd | 135 | struct device *dev = get_cpu_device(cpu); |
06a4bcae | 136 | |
8a25a2fd | 137 | sysfs_remove_group(&dev->kobj, &topology_attr_group); |
69dcc991 ZY |
138 | } |
139 | ||
a83048eb PG |
140 | static int topology_cpu_callback(struct notifier_block *nfb, |
141 | unsigned long action, void *hcpu) | |
69dcc991 ZY |
142 | { |
143 | unsigned int cpu = (unsigned long)hcpu; | |
06a4bcae | 144 | int rc = 0; |
69dcc991 | 145 | |
69dcc991 | 146 | switch (action) { |
06a4bcae | 147 | case CPU_UP_PREPARE: |
8bb78442 | 148 | case CPU_UP_PREPARE_FROZEN: |
06a4bcae | 149 | rc = topology_add_dev(cpu); |
69dcc991 | 150 | break; |
06a4bcae | 151 | case CPU_UP_CANCELED: |
8bb78442 | 152 | case CPU_UP_CANCELED_FROZEN: |
69dcc991 | 153 | case CPU_DEAD: |
8bb78442 | 154 | case CPU_DEAD_FROZEN: |
06a4bcae | 155 | topology_remove_dev(cpu); |
69dcc991 ZY |
156 | break; |
157 | } | |
ad84bb5b | 158 | return notifier_from_errno(rc); |
69dcc991 | 159 | } |
69dcc991 | 160 | |
a83048eb | 161 | static int topology_sysfs_init(void) |
69dcc991 | 162 | { |
06a4bcae HC |
163 | int cpu; |
164 | int rc; | |
69dcc991 | 165 | |
06a4bcae HC |
166 | for_each_online_cpu(cpu) { |
167 | rc = topology_add_dev(cpu); | |
168 | if (rc) | |
169 | return rc; | |
69dcc991 | 170 | } |
06a4bcae | 171 | hotcpu_notifier(topology_cpu_callback, 0); |
69dcc991 ZY |
172 | |
173 | return 0; | |
174 | } | |
175 | ||
176 | device_initcall(topology_sysfs_init); |