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1da177e Linux-2.6.12-rc2
Linus Torvalds authored
1 /*
2 * kernel/ksysfs.c - sysfs attributes in /sys/kernel, which
3 * are not related to any other subsystem
4 *
5 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
6 *
7 * This file is release under the GPLv2
8 *
9 */
10
11 #include <linux/kobject.h>
12 #include <linux/string.h>
13 #include <linux/sysfs.h>
9984de1 @paulgortmaker kernel: Map most files to use export.h instead of module.h
paulgortmaker authored
14 #include <linux/export.h>
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
15 #include <linux/init.h>
c330dda @JeffMoyer [PATCH] Add a sysfs file to determine if a kexec kernel is loaded
JeffMoyer authored
16 #include <linux/kexec.h>
22b8ce9 profiling: dynamically enable readprofile at runtime
Dave Hansen authored
17 #include <linux/profile.h>
1596425 @paulgortmaker kernel: ksysfs.c is implicitly using stat.h
paulgortmaker authored
18 #include <linux/stat.h>
5cb350b sched: group scheduling, sysfs tunables
Dhaval Giani authored
19 #include <linux/sched.h>
088ab0b @lnussel kernel/ksysfs.c: expose file_caps_enabled in sysfs
lnussel authored
20 #include <linux/capability.h>
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
21
22 #define KERNEL_ATTR_RO(_name) \
386f275 @kaysievers Driver Core: switch all dynamic ksets to kobj_sysfs_ops
kaysievers authored
23 static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
24
25 #define KERNEL_ATTR_RW(_name) \
386f275 @kaysievers Driver Core: switch all dynamic ksets to kobj_sysfs_ops
kaysievers authored
26 static struct kobj_attribute _name##_attr = \
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
27 __ATTR(_name, 0644, _name##_show, _name##_store)
28
cd3772e @ming1 kernel/ksysfs.c:fix dependence on CONFIG_NET
ming1 authored
29 #if defined(CONFIG_HOTPLUG)
0f76e5a [PATCH] add uevent_helper control in /sys/kernel/
Kay Sievers authored
30 /* current uevent sequence number */
386f275 @kaysievers Driver Core: switch all dynamic ksets to kobj_sysfs_ops
kaysievers authored
31 static ssize_t uevent_seqnum_show(struct kobject *kobj,
32 struct kobj_attribute *attr, char *buf)
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
33 {
386f275 @kaysievers Driver Core: switch all dynamic ksets to kobj_sysfs_ops
kaysievers authored
34 return sprintf(buf, "%llu\n", (unsigned long long)uevent_seqnum);
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
35 }
0f76e5a [PATCH] add uevent_helper control in /sys/kernel/
Kay Sievers authored
36 KERNEL_ATTR_RO(uevent_seqnum);
37
af66585 fix comment typo boo -> boot in ksysfs.c
Thadeu Lima de Souza Cascardo authored
38 /* uevent helper program, used during early boot */
386f275 @kaysievers Driver Core: switch all dynamic ksets to kobj_sysfs_ops
kaysievers authored
39 static ssize_t uevent_helper_show(struct kobject *kobj,
40 struct kobj_attribute *attr, char *buf)
0f76e5a [PATCH] add uevent_helper control in /sys/kernel/
Kay Sievers authored
41 {
386f275 @kaysievers Driver Core: switch all dynamic ksets to kobj_sysfs_ops
kaysievers authored
42 return sprintf(buf, "%s\n", uevent_helper);
0f76e5a [PATCH] add uevent_helper control in /sys/kernel/
Kay Sievers authored
43 }
386f275 @kaysievers Driver Core: switch all dynamic ksets to kobj_sysfs_ops
kaysievers authored
44 static ssize_t uevent_helper_store(struct kobject *kobj,
45 struct kobj_attribute *attr,
46 const char *buf, size_t count)
0f76e5a [PATCH] add uevent_helper control in /sys/kernel/
Kay Sievers authored
47 {
312c004 [PATCH] driver core: replace "hotplug" by "uevent"
Kay Sievers authored
48 if (count+1 > UEVENT_HELPER_PATH_LEN)
0f76e5a [PATCH] add uevent_helper control in /sys/kernel/
Kay Sievers authored
49 return -ENOENT;
386f275 @kaysievers Driver Core: switch all dynamic ksets to kobj_sysfs_ops
kaysievers authored
50 memcpy(uevent_helper, buf, count);
312c004 [PATCH] driver core: replace "hotplug" by "uevent"
Kay Sievers authored
51 uevent_helper[count] = '\0';
52 if (count && uevent_helper[count-1] == '\n')
53 uevent_helper[count-1] = '\0';
0f76e5a [PATCH] add uevent_helper control in /sys/kernel/
Kay Sievers authored
54 return count;
55 }
56 KERNEL_ATTR_RW(uevent_helper);
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
57 #endif
58
22b8ce9 profiling: dynamically enable readprofile at runtime
Dave Hansen authored
59 #ifdef CONFIG_PROFILING
60 static ssize_t profiling_show(struct kobject *kobj,
61 struct kobj_attribute *attr, char *buf)
62 {
63 return sprintf(buf, "%d\n", prof_on);
64 }
65 static ssize_t profiling_store(struct kobject *kobj,
66 struct kobj_attribute *attr,
67 const char *buf, size_t count)
68 {
69 int ret;
70
71 if (prof_on)
72 return -EEXIST;
73 /*
74 * This eventually calls into get_option() which
75 * has a ton of callers and is not const. It is
76 * easiest to cast it away here.
77 */
78 profile_setup((char *)buf);
79 ret = profile_init();
80 if (ret)
81 return ret;
82 ret = create_proc_profile();
83 if (ret)
84 return ret;
85 return count;
86 }
87 KERNEL_ATTR_RW(profiling);
88 #endif
89
c330dda @JeffMoyer [PATCH] Add a sysfs file to determine if a kexec kernel is loaded
JeffMoyer authored
90 #ifdef CONFIG_KEXEC
386f275 @kaysievers Driver Core: switch all dynamic ksets to kobj_sysfs_ops
kaysievers authored
91 static ssize_t kexec_loaded_show(struct kobject *kobj,
92 struct kobj_attribute *attr, char *buf)
c330dda @JeffMoyer [PATCH] Add a sysfs file to determine if a kexec kernel is loaded
JeffMoyer authored
93 {
386f275 @kaysievers Driver Core: switch all dynamic ksets to kobj_sysfs_ops
kaysievers authored
94 return sprintf(buf, "%d\n", !!kexec_image);
c330dda @JeffMoyer [PATCH] Add a sysfs file to determine if a kexec kernel is loaded
JeffMoyer authored
95 }
96 KERNEL_ATTR_RO(kexec_loaded);
97
386f275 @kaysievers Driver Core: switch all dynamic ksets to kobj_sysfs_ops
kaysievers authored
98 static ssize_t kexec_crash_loaded_show(struct kobject *kobj,
99 struct kobj_attribute *attr, char *buf)
c330dda @JeffMoyer [PATCH] Add a sysfs file to determine if a kexec kernel is loaded
JeffMoyer authored
100 {
386f275 @kaysievers Driver Core: switch all dynamic ksets to kobj_sysfs_ops
kaysievers authored
101 return sprintf(buf, "%d\n", !!kexec_crash_image);
c330dda @JeffMoyer [PATCH] Add a sysfs file to determine if a kexec kernel is loaded
JeffMoyer authored
102 }
103 KERNEL_ATTR_RO(kexec_crash_loaded);
fd59d23 @oomichi Add vmcoreinfo
oomichi authored
104
06a7f71 kexec: premit reduction of the reserved memory size
Amerigo Wang authored
105 static ssize_t kexec_crash_size_show(struct kobject *kobj,
106 struct kobj_attribute *attr, char *buf)
107 {
108 return sprintf(buf, "%zu\n", crash_get_memory_size());
109 }
110 static ssize_t kexec_crash_size_store(struct kobject *kobj,
111 struct kobj_attribute *attr,
112 const char *buf, size_t count)
113 {
114 unsigned long cnt;
115 int ret;
116
117 if (strict_strtoul(buf, 0, &cnt))
118 return -EINVAL;
119
120 ret = crash_shrink_memory(cnt);
121 return ret < 0 ? ret : count;
122 }
123 KERNEL_ATTR_RW(kexec_crash_size);
124
386f275 @kaysievers Driver Core: switch all dynamic ksets to kobj_sysfs_ops
kaysievers authored
125 static ssize_t vmcoreinfo_show(struct kobject *kobj,
126 struct kobj_attribute *attr, char *buf)
fd59d23 @oomichi Add vmcoreinfo
oomichi authored
127 {
386f275 @kaysievers Driver Core: switch all dynamic ksets to kobj_sysfs_ops
kaysievers authored
128 return sprintf(buf, "%lx %x\n",
fd59d23 @oomichi Add vmcoreinfo
oomichi authored
129 paddr_vmcoreinfo_note(),
d768281 @oomichi add-vmcore: cleanup the coding style according to Andrew's comments
oomichi authored
130 (unsigned int)vmcoreinfo_max_size);
fd59d23 @oomichi Add vmcoreinfo
oomichi authored
131 }
132 KERNEL_ATTR_RO(vmcoreinfo);
133
c330dda @JeffMoyer [PATCH] Add a sysfs file to determine if a kexec kernel is loaded
JeffMoyer authored
134 #endif /* CONFIG_KEXEC */
135
088ab0b @lnussel kernel/ksysfs.c: expose file_caps_enabled in sysfs
lnussel authored
136 /* whether file capabilities are enabled */
137 static ssize_t fscaps_show(struct kobject *kobj,
138 struct kobj_attribute *attr, char *buf)
139 {
140 return sprintf(buf, "%d\n", file_caps_enabled);
141 }
142 KERNEL_ATTR_RO(fscaps);
143
da1a679 Add /sys/kernel/notes
Roland McGrath authored
144 /*
145 * Make /sys/kernel/notes give the raw contents of our kernel .notes section.
146 */
0b1937a FRV: Fix linkage problems
David Howells authored
147 extern const void __start_notes __attribute__((weak));
148 extern const void __stop_notes __attribute__((weak));
da1a679 Add /sys/kernel/notes
Roland McGrath authored
149 #define notes_size (&__stop_notes - &__start_notes)
150
2c3c8be @chriswright sysfs: add struct file* to bin_attr callbacks
chriswright authored
151 static ssize_t notes_read(struct file *filp, struct kobject *kobj,
152 struct bin_attribute *bin_attr,
da1a679 Add /sys/kernel/notes
Roland McGrath authored
153 char *buf, loff_t off, size_t count)
154 {
155 memcpy(buf, &__start_notes + off, count);
156 return count;
157 }
158
159 static struct bin_attribute notes_attr = {
160 .attr = {
161 .name = "notes",
162 .mode = S_IRUGO,
163 },
164 .read = &notes_read,
165 };
166
0ff21e4 @gregkh kobject: convert kernel_kset to be a kobject
gregkh authored
167 struct kobject *kernel_kobj;
168 EXPORT_SYMBOL_GPL(kernel_kobj);
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
169
170 static struct attribute * kernel_attrs[] = {
088ab0b @lnussel kernel/ksysfs.c: expose file_caps_enabled in sysfs
lnussel authored
171 &fscaps_attr.attr,
cd3772e @ming1 kernel/ksysfs.c:fix dependence on CONFIG_NET
ming1 authored
172 #if defined(CONFIG_HOTPLUG)
0f76e5a [PATCH] add uevent_helper control in /sys/kernel/
Kay Sievers authored
173 &uevent_seqnum_attr.attr,
174 &uevent_helper_attr.attr,
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
175 #endif
22b8ce9 profiling: dynamically enable readprofile at runtime
Dave Hansen authored
176 #ifdef CONFIG_PROFILING
177 &profiling_attr.attr,
178 #endif
c330dda @JeffMoyer [PATCH] Add a sysfs file to determine if a kexec kernel is loaded
JeffMoyer authored
179 #ifdef CONFIG_KEXEC
180 &kexec_loaded_attr.attr,
181 &kexec_crash_loaded_attr.attr,
06a7f71 kexec: premit reduction of the reserved memory size
Amerigo Wang authored
182 &kexec_crash_size_attr.attr,
fd59d23 @oomichi Add vmcoreinfo
oomichi authored
183 &vmcoreinfo_attr.attr,
c330dda @JeffMoyer [PATCH] Add a sysfs file to determine if a kexec kernel is loaded
JeffMoyer authored
184 #endif
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
185 NULL
186 };
187
188 static struct attribute_group kernel_attr_group = {
189 .attrs = kernel_attrs,
190 };
191
192 static int __init ksysfs_init(void)
193 {
bd35b93 @gregkh kset: convert kernel_subsys to use kset_create
gregkh authored
194 int error;
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
195
0ff21e4 @gregkh kobject: convert kernel_kset to be a kobject
gregkh authored
196 kernel_kobj = kobject_create_and_add("kernel", NULL);
197 if (!kernel_kobj) {
bd35b93 @gregkh kset: convert kernel_subsys to use kset_create
gregkh authored
198 error = -ENOMEM;
199 goto exit;
200 }
0ff21e4 @gregkh kobject: convert kernel_kset to be a kobject
gregkh authored
201 error = sysfs_create_group(kernel_kobj, &kernel_attr_group);
bd35b93 @gregkh kset: convert kernel_subsys to use kset_create
gregkh authored
202 if (error)
203 goto kset_exit;
204
205 if (notes_size > 0) {
da1a679 Add /sys/kernel/notes
Roland McGrath authored
206 notes_attr.size = notes_size;
0ff21e4 @gregkh kobject: convert kernel_kset to be a kobject
gregkh authored
207 error = sysfs_create_bin_file(kernel_kobj, &notes_attr);
bd35b93 @gregkh kset: convert kernel_subsys to use kset_create
gregkh authored
208 if (error)
209 goto group_exit;
da1a679 Add /sys/kernel/notes
Roland McGrath authored
210 }
211
bd35b93 @gregkh kset: convert kernel_subsys to use kset_create
gregkh authored
212 return 0;
213
214 group_exit:
0ff21e4 @gregkh kobject: convert kernel_kset to be a kobject
gregkh authored
215 sysfs_remove_group(kernel_kobj, &kernel_attr_group);
bd35b93 @gregkh kset: convert kernel_subsys to use kset_create
gregkh authored
216 kset_exit:
78a2d90 @gregkh Kobject: convert remaining kobject_unregister() to kobject_put()
gregkh authored
217 kobject_put(kernel_kobj);
bd35b93 @gregkh kset: convert kernel_subsys to use kset_create
gregkh authored
218 exit:
1da177e Linux-2.6.12-rc2
Linus Torvalds authored
219 return error;
220 }
221
222 core_initcall(ksysfs_init);
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