[media] s5h1420: fix a buffer overflow when checking userspace params
[linux-2.6/btrfs-unstable.git] / drivers / base / topology.c
blob6491f45200a78681ce7ec95e65339292f8d194ab
1 /*
2 * driver/base/topology.c - Populate sysfs with cpu topology information
4 * Written by: Zhang Yanmin, Intel Corporation
6 * Copyright (C) 2006, Intel Corp.
8 * All rights reserved.
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.
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.
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.
26 #include <linux/mm.h>
27 #include <linux/cpu.h>
28 #include <linux/module.h>
29 #include <linux/hardirq.h>
30 #include <linux/topology.h>
32 #define define_id_show_func(name) \
33 static ssize_t name##_show(struct device *dev, \
34 struct device_attribute *attr, char *buf) \
35 { \
36 return sprintf(buf, "%d\n", topology_##name(dev->id)); \
39 #define define_siblings_show_map(name, mask) \
40 static ssize_t name##_show(struct device *dev, \
41 struct device_attribute *attr, char *buf) \
42 { \
43 return cpumap_print_to_pagebuf(false, buf, topology_##mask(dev->id));\
46 #define define_siblings_show_list(name, mask) \
47 static ssize_t name##_list_show(struct device *dev, \
48 struct device_attribute *attr, \
49 char *buf) \
50 { \
51 return cpumap_print_to_pagebuf(true, buf, topology_##mask(dev->id));\
54 #define define_siblings_show_func(name, mask) \
55 define_siblings_show_map(name, mask); \
56 define_siblings_show_list(name, mask)
58 define_id_show_func(physical_package_id);
59 static DEVICE_ATTR_RO(physical_package_id);
61 define_id_show_func(core_id);
62 static DEVICE_ATTR_RO(core_id);
64 define_siblings_show_func(thread_siblings, thread_cpumask);
65 static DEVICE_ATTR_RO(thread_siblings);
66 static DEVICE_ATTR_RO(thread_siblings_list);
68 define_siblings_show_func(core_siblings, core_cpumask);
69 static DEVICE_ATTR_RO(core_siblings);
70 static DEVICE_ATTR_RO(core_siblings_list);
72 #ifdef CONFIG_SCHED_BOOK
73 define_id_show_func(book_id);
74 static DEVICE_ATTR_RO(book_id);
75 define_siblings_show_func(book_siblings, book_cpumask);
76 static DEVICE_ATTR_RO(book_siblings);
77 static DEVICE_ATTR_RO(book_siblings_list);
78 #endif
80 static struct attribute *default_attrs[] = {
81 &dev_attr_physical_package_id.attr,
82 &dev_attr_core_id.attr,
83 &dev_attr_thread_siblings.attr,
84 &dev_attr_thread_siblings_list.attr,
85 &dev_attr_core_siblings.attr,
86 &dev_attr_core_siblings_list.attr,
87 #ifdef CONFIG_SCHED_BOOK
88 &dev_attr_book_id.attr,
89 &dev_attr_book_siblings.attr,
90 &dev_attr_book_siblings_list.attr,
91 #endif
92 NULL
95 static struct attribute_group topology_attr_group = {
96 .attrs = default_attrs,
97 .name = "topology"
100 /* Add/Remove cpu_topology interface for CPU device */
101 static int topology_add_dev(unsigned int cpu)
103 struct device *dev = get_cpu_device(cpu);
105 return sysfs_create_group(&dev->kobj, &topology_attr_group);
108 static void topology_remove_dev(unsigned int cpu)
110 struct device *dev = get_cpu_device(cpu);
112 sysfs_remove_group(&dev->kobj, &topology_attr_group);
115 static int topology_cpu_callback(struct notifier_block *nfb,
116 unsigned long action, void *hcpu)
118 unsigned int cpu = (unsigned long)hcpu;
119 int rc = 0;
121 switch (action) {
122 case CPU_UP_PREPARE:
123 case CPU_UP_PREPARE_FROZEN:
124 rc = topology_add_dev(cpu);
125 break;
126 case CPU_UP_CANCELED:
127 case CPU_UP_CANCELED_FROZEN:
128 case CPU_DEAD:
129 case CPU_DEAD_FROZEN:
130 topology_remove_dev(cpu);
131 break;
133 return notifier_from_errno(rc);
136 static int topology_sysfs_init(void)
138 int cpu;
139 int rc = 0;
141 cpu_notifier_register_begin();
143 for_each_online_cpu(cpu) {
144 rc = topology_add_dev(cpu);
145 if (rc)
146 goto out;
148 __hotcpu_notifier(topology_cpu_callback, 0);
150 out:
151 cpu_notifier_register_done();
152 return rc;
155 device_initcall(topology_sysfs_init);