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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> |
14 | #include <linux/export.h> |
15 | #include <linux/init.h> |
16 | #include <linux/kexec.h> |
17 | #include <linux/profile.h> |
18 | #include <linux/stat.h> |
19 | #include <linux/sched.h> |
20 | #include <linux/capability.h> |
21 | |
22 | #define KERNEL_ATTR_RO(_name) \ |
23 | static struct kobj_attribute _name##_attr = __ATTR_RO(_name) |
24 | |
25 | #define KERNEL_ATTR_RW(_name) \ |
26 | static struct kobj_attribute _name##_attr = \ |
27 | __ATTR(_name, 0644, _name##_show, _name##_store) |
28 | |
29 | #if defined(CONFIG_HOTPLUG) |
30 | /* current uevent sequence number */ |
31 | static ssize_t uevent_seqnum_show(struct kobject *kobj, |
32 | struct kobj_attribute *attr, char *buf) |
33 | { |
34 | return sprintf(buf, "%llu\n", (unsigned long long)uevent_seqnum); |
35 | } |
36 | KERNEL_ATTR_RO(uevent_seqnum); |
37 | |
38 | /* uevent helper program, used during early boot */ |
39 | static ssize_t uevent_helper_show(struct kobject *kobj, |
40 | struct kobj_attribute *attr, char *buf) |
41 | { |
42 | return sprintf(buf, "%s\n", uevent_helper); |
43 | } |
44 | static ssize_t uevent_helper_store(struct kobject *kobj, |
45 | struct kobj_attribute *attr, |
46 | const char *buf, size_t count) |
47 | { |
48 | if (count+1 > UEVENT_HELPER_PATH_LEN) |
49 | return -ENOENT; |
50 | memcpy(uevent_helper, buf, count); |
51 | uevent_helper[count] = '\0'; |
52 | if (count && uevent_helper[count-1] == '\n') |
53 | uevent_helper[count-1] = '\0'; |
54 | return count; |
55 | } |
56 | KERNEL_ATTR_RW(uevent_helper); |
57 | #endif |
58 | |
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 | |
90 | #ifdef CONFIG_KEXEC |
91 | static ssize_t kexec_loaded_show(struct kobject *kobj, |
92 | struct kobj_attribute *attr, char *buf) |
93 | { |
94 | return sprintf(buf, "%d\n", !!kexec_image); |
95 | } |
96 | KERNEL_ATTR_RO(kexec_loaded); |
97 | |
98 | static ssize_t kexec_crash_loaded_show(struct kobject *kobj, |
99 | struct kobj_attribute *attr, char *buf) |
100 | { |
101 | return sprintf(buf, "%d\n", !!kexec_crash_image); |
102 | } |
103 | KERNEL_ATTR_RO(kexec_crash_loaded); |
104 | |
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 | |
125 | static ssize_t vmcoreinfo_show(struct kobject *kobj, |
126 | struct kobj_attribute *attr, char *buf) |
127 | { |
128 | return sprintf(buf, "%lx %x\n", |
129 | paddr_vmcoreinfo_note(), |
130 | (unsigned int)vmcoreinfo_max_size); |
131 | } |
132 | KERNEL_ATTR_RO(vmcoreinfo); |
133 | |
134 | #endif /* CONFIG_KEXEC */ |
135 | |
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 | |
144 | /* |
145 | * Make /sys/kernel/notes give the raw contents of our kernel .notes section. |
146 | */ |
147 | extern const void __start_notes __attribute__((weak)); |
148 | extern const void __stop_notes __attribute__((weak)); |
149 | #define notes_size (&__stop_notes - &__start_notes) |
150 | |
151 | static ssize_t notes_read(struct file *filp, struct kobject *kobj, |
152 | struct bin_attribute *bin_attr, |
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 = ¬es_read, |
165 | }; |
166 | |
167 | struct kobject *kernel_kobj; |
168 | EXPORT_SYMBOL_GPL(kernel_kobj); |
169 | |
170 | static struct attribute * kernel_attrs[] = { |
171 | &fscaps_attr.attr, |
172 | #if defined(CONFIG_HOTPLUG) |
173 | &uevent_seqnum_attr.attr, |
174 | &uevent_helper_attr.attr, |
175 | #endif |
176 | #ifdef CONFIG_PROFILING |
177 | &profiling_attr.attr, |
178 | #endif |
179 | #ifdef CONFIG_KEXEC |
180 | &kexec_loaded_attr.attr, |
181 | &kexec_crash_loaded_attr.attr, |
182 | &kexec_crash_size_attr.attr, |
183 | &vmcoreinfo_attr.attr, |
184 | #endif |
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 | { |
194 | int error; |
195 | |
196 | kernel_kobj = kobject_create_and_add("kernel", NULL); |
197 | if (!kernel_kobj) { |
198 | error = -ENOMEM; |
199 | goto exit; |
200 | } |
201 | error = sysfs_create_group(kernel_kobj, &kernel_attr_group); |
202 | if (error) |
203 | goto kset_exit; |
204 | |
205 | if (notes_size > 0) { |
206 | notes_attr.size = notes_size; |
207 | error = sysfs_create_bin_file(kernel_kobj, ¬es_attr); |
208 | if (error) |
209 | goto group_exit; |
210 | } |
211 | |
212 | return 0; |
213 | |
214 | group_exit: |
215 | sysfs_remove_group(kernel_kobj, &kernel_attr_group); |
216 | kset_exit: |
217 | kobject_put(kernel_kobj); |
218 | exit: |
219 | return error; |
220 | } |
221 | |
222 | core_initcall(ksysfs_init); |
223 |
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