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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 | */ | |
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/topology.h> | |
32 | ||
33 | #define define_one_ro(_name) \ | |
34 | static SYSDEV_ATTR(_name, 0444, show_##_name, NULL) | |
35 | ||
36 | #define define_id_show_func(name) \ | |
37 | static ssize_t show_##name(struct sys_device *dev, char *buf) \ | |
38 | { \ | |
39 | unsigned int cpu = dev->id; \ | |
40 | return sprintf(buf, "%d\n", topology_##name(cpu)); \ | |
41 | } | |
42 | ||
23ca4bba | 43 | #if defined(topology_thread_siblings) || defined(topology_core_siblings) |
39106dcf MT |
44 | static ssize_t show_cpumap(int type, cpumask_t *mask, char *buf) |
45 | { | |
46 | ptrdiff_t len = PTR_ALIGN(buf + PAGE_SIZE - 1, PAGE_SIZE) - buf; | |
47 | int n = 0; | |
48 | ||
49 | if (len > 1) { | |
50 | n = type? | |
51 | cpulist_scnprintf(buf, len-2, *mask): | |
52 | cpumask_scnprintf(buf, len-2, *mask); | |
53 | buf[n++] = '\n'; | |
54 | buf[n] = '\0'; | |
55 | } | |
56 | return n; | |
57 | } | |
23ca4bba | 58 | #endif |
39106dcf | 59 | |
23ca4bba | 60 | #ifdef arch_provides_topology_pointers |
39106dcf | 61 | #define define_siblings_show_map(name) \ |
23ca4bba | 62 | static ssize_t show_##name(struct sys_device *dev, char *buf) \ |
39106dcf MT |
63 | { \ |
64 | unsigned int cpu = dev->id; \ | |
65 | return show_cpumap(0, &(topology_##name(cpu)), buf); \ | |
66 | } | |
67 | ||
68 | #define define_siblings_show_list(name) \ | |
23ca4bba | 69 | static ssize_t show_##name##_list(struct sys_device *dev, char *buf) \ |
69dcc991 | 70 | { \ |
69dcc991 | 71 | unsigned int cpu = dev->id; \ |
39106dcf | 72 | return show_cpumap(1, &(topology_##name(cpu)), buf); \ |
69dcc991 ZY |
73 | } |
74 | ||
23ca4bba MT |
75 | #else |
76 | #define define_siblings_show_map(name) \ | |
77 | static ssize_t show_##name(struct sys_device *dev, char *buf) \ | |
78 | { \ | |
79 | unsigned int cpu = dev->id; \ | |
80 | cpumask_t mask = topology_##name(cpu); \ | |
81 | return show_cpumap(0, &mask, buf); \ | |
82 | } | |
83 | ||
84 | #define define_siblings_show_list(name) \ | |
85 | static ssize_t show_##name##_list(struct sys_device *dev, char *buf) \ | |
86 | { \ | |
87 | unsigned int cpu = dev->id; \ | |
88 | cpumask_t mask = topology_##name(cpu); \ | |
89 | return show_cpumap(1, &mask, buf); \ | |
90 | } | |
91 | #endif | |
92 | ||
39106dcf MT |
93 | #define define_siblings_show_func(name) \ |
94 | define_siblings_show_map(name); define_siblings_show_list(name) | |
95 | ||
69dcc991 ZY |
96 | #ifdef topology_physical_package_id |
97 | define_id_show_func(physical_package_id); | |
98 | define_one_ro(physical_package_id); | |
99 | #define ref_physical_package_id_attr &attr_physical_package_id.attr, | |
100 | #else | |
101 | #define ref_physical_package_id_attr | |
102 | #endif | |
103 | ||
104 | #ifdef topology_core_id | |
105 | define_id_show_func(core_id); | |
106 | define_one_ro(core_id); | |
107 | #define ref_core_id_attr &attr_core_id.attr, | |
108 | #else | |
109 | #define ref_core_id_attr | |
110 | #endif | |
111 | ||
112 | #ifdef topology_thread_siblings | |
113 | define_siblings_show_func(thread_siblings); | |
114 | define_one_ro(thread_siblings); | |
39106dcf MT |
115 | define_one_ro(thread_siblings_list); |
116 | #define ref_thread_siblings_attr \ | |
117 | &attr_thread_siblings.attr, &attr_thread_siblings_list.attr, | |
69dcc991 ZY |
118 | #else |
119 | #define ref_thread_siblings_attr | |
120 | #endif | |
121 | ||
122 | #ifdef topology_core_siblings | |
123 | define_siblings_show_func(core_siblings); | |
124 | define_one_ro(core_siblings); | |
39106dcf MT |
125 | define_one_ro(core_siblings_list); |
126 | #define ref_core_siblings_attr \ | |
127 | &attr_core_siblings.attr, &attr_core_siblings_list.attr, | |
69dcc991 ZY |
128 | #else |
129 | #define ref_core_siblings_attr | |
130 | #endif | |
131 | ||
132 | static struct attribute *default_attrs[] = { | |
133 | ref_physical_package_id_attr | |
134 | ref_core_id_attr | |
135 | ref_thread_siblings_attr | |
136 | ref_core_siblings_attr | |
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 */ | |
06a4bcae | 146 | static int __cpuinit topology_add_dev(unsigned int cpu) |
69dcc991 | 147 | { |
06a4bcae HC |
148 | struct sys_device *sys_dev = get_cpu_sysdev(cpu); |
149 | ||
9780e3e9 | 150 | return sysfs_create_group(&sys_dev->kobj, &topology_attr_group); |
69dcc991 ZY |
151 | } |
152 | ||
06a4bcae | 153 | static void __cpuinit topology_remove_dev(unsigned int cpu) |
69dcc991 | 154 | { |
06a4bcae HC |
155 | struct sys_device *sys_dev = get_cpu_sysdev(cpu); |
156 | ||
69dcc991 | 157 | sysfs_remove_group(&sys_dev->kobj, &topology_attr_group); |
69dcc991 ZY |
158 | } |
159 | ||
9c7b216d | 160 | static int __cpuinit topology_cpu_callback(struct notifier_block *nfb, |
06a4bcae | 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 | } | |
06a4bcae | 178 | return rc ? NOTIFY_BAD : NOTIFY_OK; |
69dcc991 | 179 | } |
69dcc991 ZY |
180 | |
181 | static int __cpuinit topology_sysfs_init(void) | |
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); |