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/mm.h> |
27 | #include <linux/cpu.h> | |
28 | #include <linux/module.h> | |
b13d3720 | 29 | #include <linux/hardirq.h> |
69dcc991 ZY |
30 | #include <linux/topology.h> |
31 | ||
fbd59a8d | 32 | #define define_one_ro_named(_name, _func) \ |
8a25a2fd | 33 | static DEVICE_ATTR(_name, 0444, _func, NULL) |
fbd59a8d RR |
34 | |
35 | #define define_one_ro(_name) \ | |
8a25a2fd | 36 | static DEVICE_ATTR(_name, 0444, show_##_name, NULL) |
69dcc991 ZY |
37 | |
38 | #define define_id_show_func(name) \ | |
8a25a2fd KS |
39 | static ssize_t show_##name(struct device *dev, \ |
40 | struct device_attribute *attr, char *buf) \ | |
69dcc991 | 41 | { \ |
53974e06 | 42 | return sprintf(buf, "%d\n", topology_##name(dev->id)); \ |
69dcc991 ZY |
43 | } |
44 | ||
b40d8ed4 HC |
45 | #if defined(topology_thread_cpumask) || defined(topology_core_cpumask) || \ |
46 | defined(topology_book_cpumask) | |
fbd59a8d | 47 | static ssize_t show_cpumap(int type, const struct cpumask *mask, char *buf) |
39106dcf MT |
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? | |
29c0177e RR |
54 | cpulist_scnprintf(buf, len-2, mask) : |
55 | cpumask_scnprintf(buf, len-2, mask); | |
39106dcf MT |
56 | buf[n++] = '\n'; |
57 | buf[n] = '\0'; | |
58 | } | |
59 | return n; | |
60 | } | |
23ca4bba | 61 | #endif |
39106dcf | 62 | |
23ca4bba | 63 | #define define_siblings_show_map(name) \ |
8a25a2fd KS |
64 | static ssize_t show_##name(struct device *dev, \ |
65 | struct device_attribute *attr, char *buf) \ | |
23ca4bba | 66 | { \ |
fbd59a8d | 67 | return show_cpumap(0, topology_##name(dev->id), buf); \ |
23ca4bba MT |
68 | } |
69 | ||
70 | #define define_siblings_show_list(name) \ | |
8a25a2fd KS |
71 | static ssize_t show_##name##_list(struct device *dev, \ |
72 | struct device_attribute *attr, \ | |
4a0b2b4d | 73 | char *buf) \ |
23ca4bba | 74 | { \ |
fbd59a8d | 75 | return show_cpumap(1, topology_##name(dev->id), buf); \ |
23ca4bba | 76 | } |
23ca4bba | 77 | |
39106dcf MT |
78 | #define define_siblings_show_func(name) \ |
79 | define_siblings_show_map(name); define_siblings_show_list(name) | |
80 | ||
69dcc991 ZY |
81 | define_id_show_func(physical_package_id); |
82 | define_one_ro(physical_package_id); | |
69dcc991 | 83 | |
69dcc991 ZY |
84 | define_id_show_func(core_id); |
85 | define_one_ro(core_id); | |
69dcc991 | 86 | |
fbd59a8d RR |
87 | define_siblings_show_func(thread_cpumask); |
88 | define_one_ro_named(thread_siblings, show_thread_cpumask); | |
89 | define_one_ro_named(thread_siblings_list, show_thread_cpumask_list); | |
69dcc991 | 90 | |
fbd59a8d RR |
91 | define_siblings_show_func(core_cpumask); |
92 | define_one_ro_named(core_siblings, show_core_cpumask); | |
93 | define_one_ro_named(core_siblings_list, show_core_cpumask_list); | |
69dcc991 | 94 | |
b40d8ed4 HC |
95 | #ifdef CONFIG_SCHED_BOOK |
96 | define_id_show_func(book_id); | |
97 | define_one_ro(book_id); | |
98 | define_siblings_show_func(book_cpumask); | |
99 | define_one_ro_named(book_siblings, show_book_cpumask); | |
100 | define_one_ro_named(book_siblings_list, show_book_cpumask_list); | |
101 | #endif | |
102 | ||
69dcc991 | 103 | static struct attribute *default_attrs[] = { |
8a25a2fd KS |
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, | |
b40d8ed4 | 110 | #ifdef CONFIG_SCHED_BOOK |
8a25a2fd KS |
111 | &dev_attr_book_id.attr, |
112 | &dev_attr_book_siblings.attr, | |
113 | &dev_attr_book_siblings_list.attr, | |
b40d8ed4 | 114 | #endif |
69dcc991 ZY |
115 | NULL |
116 | }; | |
117 | ||
118 | static struct attribute_group topology_attr_group = { | |
119 | .attrs = default_attrs, | |
120 | .name = "topology" | |
121 | }; | |
122 | ||
123 | /* Add/Remove cpu_topology interface for CPU device */ | |
a83048eb | 124 | static int topology_add_dev(unsigned int cpu) |
69dcc991 | 125 | { |
8a25a2fd | 126 | struct device *dev = get_cpu_device(cpu); |
06a4bcae | 127 | |
8a25a2fd | 128 | return sysfs_create_group(&dev->kobj, &topology_attr_group); |
69dcc991 ZY |
129 | } |
130 | ||
a83048eb | 131 | static void topology_remove_dev(unsigned int cpu) |
69dcc991 | 132 | { |
8a25a2fd | 133 | struct device *dev = get_cpu_device(cpu); |
06a4bcae | 134 | |
8a25a2fd | 135 | sysfs_remove_group(&dev->kobj, &topology_attr_group); |
69dcc991 ZY |
136 | } |
137 | ||
a83048eb PG |
138 | static int topology_cpu_callback(struct notifier_block *nfb, |
139 | unsigned long action, void *hcpu) | |
69dcc991 ZY |
140 | { |
141 | unsigned int cpu = (unsigned long)hcpu; | |
06a4bcae | 142 | int rc = 0; |
69dcc991 | 143 | |
69dcc991 | 144 | switch (action) { |
06a4bcae | 145 | case CPU_UP_PREPARE: |
8bb78442 | 146 | case CPU_UP_PREPARE_FROZEN: |
06a4bcae | 147 | rc = topology_add_dev(cpu); |
69dcc991 | 148 | break; |
06a4bcae | 149 | case CPU_UP_CANCELED: |
8bb78442 | 150 | case CPU_UP_CANCELED_FROZEN: |
69dcc991 | 151 | case CPU_DEAD: |
8bb78442 | 152 | case CPU_DEAD_FROZEN: |
06a4bcae | 153 | topology_remove_dev(cpu); |
69dcc991 ZY |
154 | break; |
155 | } | |
ad84bb5b | 156 | return notifier_from_errno(rc); |
69dcc991 | 157 | } |
69dcc991 | 158 | |
a83048eb | 159 | static int topology_sysfs_init(void) |
69dcc991 | 160 | { |
06a4bcae | 161 | int cpu; |
e12b7111 SB |
162 | int rc = 0; |
163 | ||
164 | cpu_notifier_register_begin(); | |
69dcc991 | 165 | |
06a4bcae HC |
166 | for_each_online_cpu(cpu) { |
167 | rc = topology_add_dev(cpu); | |
168 | if (rc) | |
e12b7111 | 169 | goto out; |
69dcc991 | 170 | } |
e12b7111 | 171 | __hotcpu_notifier(topology_cpu_callback, 0); |
69dcc991 | 172 | |
e12b7111 SB |
173 | out: |
174 | cpu_notifier_register_done(); | |
175 | return rc; | |
69dcc991 ZY |
176 | } |
177 | ||
178 | device_initcall(topology_sysfs_init); |