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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 | ||
43 | #define define_siblings_show_func(name) \ | |
44 | static ssize_t show_##name(struct sys_device *dev, char *buf) \ | |
45 | { \ | |
46 | ssize_t len = -1; \ | |
47 | unsigned int cpu = dev->id; \ | |
48 | len = cpumask_scnprintf(buf, NR_CPUS+1, topology_##name(cpu)); \ | |
49 | return (len + sprintf(buf + len, "\n")); \ | |
50 | } | |
51 | ||
52 | #ifdef topology_physical_package_id | |
53 | define_id_show_func(physical_package_id); | |
54 | define_one_ro(physical_package_id); | |
55 | #define ref_physical_package_id_attr &attr_physical_package_id.attr, | |
56 | #else | |
57 | #define ref_physical_package_id_attr | |
58 | #endif | |
59 | ||
60 | #ifdef topology_core_id | |
61 | define_id_show_func(core_id); | |
62 | define_one_ro(core_id); | |
63 | #define ref_core_id_attr &attr_core_id.attr, | |
64 | #else | |
65 | #define ref_core_id_attr | |
66 | #endif | |
67 | ||
68 | #ifdef topology_thread_siblings | |
69 | define_siblings_show_func(thread_siblings); | |
70 | define_one_ro(thread_siblings); | |
71 | #define ref_thread_siblings_attr &attr_thread_siblings.attr, | |
72 | #else | |
73 | #define ref_thread_siblings_attr | |
74 | #endif | |
75 | ||
76 | #ifdef topology_core_siblings | |
77 | define_siblings_show_func(core_siblings); | |
78 | define_one_ro(core_siblings); | |
79 | #define ref_core_siblings_attr &attr_core_siblings.attr, | |
80 | #else | |
81 | #define ref_core_siblings_attr | |
82 | #endif | |
83 | ||
84 | static struct attribute *default_attrs[] = { | |
85 | ref_physical_package_id_attr | |
86 | ref_core_id_attr | |
87 | ref_thread_siblings_attr | |
88 | ref_core_siblings_attr | |
89 | NULL | |
90 | }; | |
91 | ||
92 | static struct attribute_group topology_attr_group = { | |
93 | .attrs = default_attrs, | |
94 | .name = "topology" | |
95 | }; | |
96 | ||
97 | /* Add/Remove cpu_topology interface for CPU device */ | |
98 | static int __cpuinit topology_add_dev(struct sys_device * sys_dev) | |
99 | { | |
100 | sysfs_create_group(&sys_dev->kobj, &topology_attr_group); | |
101 | return 0; | |
102 | } | |
103 | ||
104 | static int __cpuinit topology_remove_dev(struct sys_device * sys_dev) | |
105 | { | |
106 | sysfs_remove_group(&sys_dev->kobj, &topology_attr_group); | |
107 | return 0; | |
108 | } | |
109 | ||
110 | static int __cpuinit topology_cpu_callback(struct notifier_block *nfb, | |
111 | unsigned long action, void *hcpu) | |
112 | { | |
113 | unsigned int cpu = (unsigned long)hcpu; | |
114 | struct sys_device *sys_dev; | |
115 | ||
116 | sys_dev = get_cpu_sysdev(cpu); | |
117 | switch (action) { | |
118 | case CPU_ONLINE: | |
119 | topology_add_dev(sys_dev); | |
120 | break; | |
121 | case CPU_DEAD: | |
122 | topology_remove_dev(sys_dev); | |
123 | break; | |
124 | } | |
125 | return NOTIFY_OK; | |
126 | } | |
127 | ||
128 | static struct notifier_block topology_cpu_notifier = | |
129 | { | |
130 | .notifier_call = topology_cpu_callback, | |
131 | }; | |
132 | ||
133 | static int __cpuinit topology_sysfs_init(void) | |
134 | { | |
135 | int i; | |
136 | ||
137 | for_each_online_cpu(i) { | |
138 | topology_cpu_callback(&topology_cpu_notifier, CPU_ONLINE, | |
139 | (void *)(long)i); | |
140 | } | |
141 | ||
142 | register_cpu_notifier(&topology_cpu_notifier); | |
143 | ||
144 | return 0; | |
145 | } | |
146 | ||
147 | device_initcall(topology_sysfs_init); | |
148 |