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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 | /* current uevent sequence number */ |
30 | static ssize_t uevent_seqnum_show(struct kobject *kobj, |
31 | struct kobj_attribute *attr, char *buf) |
32 | { |
33 | return sprintf(buf, "%llu\n", (unsigned long long)uevent_seqnum); |
34 | } |
35 | KERNEL_ATTR_RO(uevent_seqnum); |
36 | |
37 | /* uevent helper program, used during early boot */ |
38 | static ssize_t uevent_helper_show(struct kobject *kobj, |
39 | struct kobj_attribute *attr, char *buf) |
40 | { |
41 | return sprintf(buf, "%s\n", uevent_helper); |
42 | } |
43 | static ssize_t uevent_helper_store(struct kobject *kobj, |
44 | struct kobj_attribute *attr, |
45 | const char *buf, size_t count) |
46 | { |
47 | if (count+1 > UEVENT_HELPER_PATH_LEN) |
48 | return -ENOENT; |
49 | memcpy(uevent_helper, buf, count); |
50 | uevent_helper[count] = '\0'; |
51 | if (count && uevent_helper[count-1] == '\n') |
52 | uevent_helper[count-1] = '\0'; |
53 | return count; |
54 | } |
55 | KERNEL_ATTR_RW(uevent_helper); |
56 | |
57 | |
58 | #ifdef CONFIG_PROFILING |
59 | static ssize_t profiling_show(struct kobject *kobj, |
60 | struct kobj_attribute *attr, char *buf) |
61 | { |
62 | return sprintf(buf, "%d\n", prof_on); |
63 | } |
64 | static ssize_t profiling_store(struct kobject *kobj, |
65 | struct kobj_attribute *attr, |
66 | const char *buf, size_t count) |
67 | { |
68 | int ret; |
69 | |
70 | if (prof_on) |
71 | return -EEXIST; |
72 | /* |
73 | * This eventually calls into get_option() which |
74 | * has a ton of callers and is not const. It is |
75 | * easiest to cast it away here. |
76 | */ |
77 | profile_setup((char *)buf); |
78 | ret = profile_init(); |
79 | if (ret) |
80 | return ret; |
81 | ret = create_proc_profile(); |
82 | if (ret) |
83 | return ret; |
84 | return count; |
85 | } |
86 | KERNEL_ATTR_RW(profiling); |
87 | #endif |
88 | |
89 | #ifdef CONFIG_KEXEC |
90 | static ssize_t kexec_loaded_show(struct kobject *kobj, |
91 | struct kobj_attribute *attr, char *buf) |
92 | { |
93 | return sprintf(buf, "%d\n", !!kexec_image); |
94 | } |
95 | KERNEL_ATTR_RO(kexec_loaded); |
96 | |
97 | static ssize_t kexec_crash_loaded_show(struct kobject *kobj, |
98 | struct kobj_attribute *attr, char *buf) |
99 | { |
100 | return sprintf(buf, "%d\n", !!kexec_crash_image); |
101 | } |
102 | KERNEL_ATTR_RO(kexec_crash_loaded); |
103 | |
104 | static ssize_t kexec_crash_size_show(struct kobject *kobj, |
105 | struct kobj_attribute *attr, char *buf) |
106 | { |
107 | return sprintf(buf, "%zu\n", crash_get_memory_size()); |
108 | } |
109 | static ssize_t kexec_crash_size_store(struct kobject *kobj, |
110 | struct kobj_attribute *attr, |
111 | const char *buf, size_t count) |
112 | { |
113 | unsigned long cnt; |
114 | int ret; |
115 | |
116 | if (kstrtoul(buf, 0, &cnt)) |
117 | return -EINVAL; |
118 | |
119 | ret = crash_shrink_memory(cnt); |
120 | return ret < 0 ? ret : count; |
121 | } |
122 | KERNEL_ATTR_RW(kexec_crash_size); |
123 | |
124 | static ssize_t vmcoreinfo_show(struct kobject *kobj, |
125 | struct kobj_attribute *attr, char *buf) |
126 | { |
127 | return sprintf(buf, "%lx %x\n", |
128 | paddr_vmcoreinfo_note(), |
129 | (unsigned int)vmcoreinfo_max_size); |
130 | } |
131 | KERNEL_ATTR_RO(vmcoreinfo); |
132 | |
133 | #endif /* CONFIG_KEXEC */ |
134 | |
135 | /* whether file capabilities are enabled */ |
136 | static ssize_t fscaps_show(struct kobject *kobj, |
137 | struct kobj_attribute *attr, char *buf) |
138 | { |
139 | return sprintf(buf, "%d\n", file_caps_enabled); |
140 | } |
141 | KERNEL_ATTR_RO(fscaps); |
142 | |
143 | int rcu_expedited; |
144 | static ssize_t rcu_expedited_show(struct kobject *kobj, |
145 | struct kobj_attribute *attr, char *buf) |
146 | { |
147 | return sprintf(buf, "%d\n", rcu_expedited); |
148 | } |
149 | static ssize_t rcu_expedited_store(struct kobject *kobj, |
150 | struct kobj_attribute *attr, |
151 | const char *buf, size_t count) |
152 | { |
153 | if (kstrtoint(buf, 0, &rcu_expedited)) |
154 | return -EINVAL; |
155 | |
156 | return count; |
157 | } |
158 | KERNEL_ATTR_RW(rcu_expedited); |
159 | |
160 | /* |
161 | * Make /sys/kernel/notes give the raw contents of our kernel .notes section. |
162 | */ |
163 | extern const void __start_notes __attribute__((weak)); |
164 | extern const void __stop_notes __attribute__((weak)); |
165 | #define notes_size (&__stop_notes - &__start_notes) |
166 | |
167 | static ssize_t notes_read(struct file *filp, struct kobject *kobj, |
168 | struct bin_attribute *bin_attr, |
169 | char *buf, loff_t off, size_t count) |
170 | { |
171 | memcpy(buf, &__start_notes + off, count); |
172 | return count; |
173 | } |
174 | |
175 | static struct bin_attribute notes_attr = { |
176 | .attr = { |
177 | .name = "notes", |
178 | .mode = S_IRUGO, |
179 | }, |
180 | .read = ¬es_read, |
181 | }; |
182 | |
183 | struct kobject *kernel_kobj; |
184 | EXPORT_SYMBOL_GPL(kernel_kobj); |
185 | |
186 | static struct attribute * kernel_attrs[] = { |
187 | &fscaps_attr.attr, |
188 | &uevent_seqnum_attr.attr, |
189 | &uevent_helper_attr.attr, |
190 | #ifdef CONFIG_PROFILING |
191 | &profiling_attr.attr, |
192 | #endif |
193 | #ifdef CONFIG_KEXEC |
194 | &kexec_loaded_attr.attr, |
195 | &kexec_crash_loaded_attr.attr, |
196 | &kexec_crash_size_attr.attr, |
197 | &vmcoreinfo_attr.attr, |
198 | #endif |
199 | &rcu_expedited_attr.attr, |
200 | NULL |
201 | }; |
202 | |
203 | static struct attribute_group kernel_attr_group = { |
204 | .attrs = kernel_attrs, |
205 | }; |
206 | |
207 | static int __init ksysfs_init(void) |
208 | { |
209 | int error; |
210 | |
211 | kernel_kobj = kobject_create_and_add("kernel", NULL); |
212 | if (!kernel_kobj) { |
213 | error = -ENOMEM; |
214 | goto exit; |
215 | } |
216 | error = sysfs_create_group(kernel_kobj, &kernel_attr_group); |
217 | if (error) |
218 | goto kset_exit; |
219 | |
220 | if (notes_size > 0) { |
221 | notes_attr.size = notes_size; |
222 | error = sysfs_create_bin_file(kernel_kobj, ¬es_attr); |
223 | if (error) |
224 | goto group_exit; |
225 | } |
226 | |
227 | return 0; |
228 | |
229 | group_exit: |
230 | sysfs_remove_group(kernel_kobj, &kernel_attr_group); |
231 | kset_exit: |
232 | kobject_put(kernel_kobj); |
233 | exit: |
234 | return error; |
235 | } |
236 | |
237 | core_initcall(ksysfs_init); |
238 |
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