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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/module.h> |
15 | #include <linux/init.h> |
16 | #include <linux/kexec.h> |
17 | #include <linux/profile.h> |
18 | #include <linux/sched.h> |
19 | |
20 | #define KERNEL_ATTR_RO(_name) \ |
21 | static struct kobj_attribute _name##_attr = __ATTR_RO(_name) |
22 | |
23 | #define KERNEL_ATTR_RW(_name) \ |
24 | static struct kobj_attribute _name##_attr = \ |
25 | __ATTR(_name, 0644, _name##_show, _name##_store) |
26 | |
27 | #if defined(CONFIG_HOTPLUG) |
28 | /* current uevent sequence number */ |
29 | static ssize_t uevent_seqnum_show(struct kobject *kobj, |
30 | struct kobj_attribute *attr, char *buf) |
31 | { |
32 | return sprintf(buf, "%llu\n", (unsigned long long)uevent_seqnum); |
33 | } |
34 | KERNEL_ATTR_RO(uevent_seqnum); |
35 | |
36 | /* uevent helper program, used during early boot */ |
37 | static ssize_t uevent_helper_show(struct kobject *kobj, |
38 | struct kobj_attribute *attr, char *buf) |
39 | { |
40 | return sprintf(buf, "%s\n", uevent_helper); |
41 | } |
42 | static ssize_t uevent_helper_store(struct kobject *kobj, |
43 | struct kobj_attribute *attr, |
44 | const char *buf, size_t count) |
45 | { |
46 | if (count+1 > UEVENT_HELPER_PATH_LEN) |
47 | return -ENOENT; |
48 | memcpy(uevent_helper, buf, count); |
49 | uevent_helper[count] = '\0'; |
50 | if (count && uevent_helper[count-1] == '\n') |
51 | uevent_helper[count-1] = '\0'; |
52 | return count; |
53 | } |
54 | KERNEL_ATTR_RW(uevent_helper); |
55 | #endif |
56 | |
57 | #ifdef CONFIG_PROFILING |
58 | static ssize_t profiling_show(struct kobject *kobj, |
59 | struct kobj_attribute *attr, char *buf) |
60 | { |
61 | return sprintf(buf, "%d\n", prof_on); |
62 | } |
63 | static ssize_t profiling_store(struct kobject *kobj, |
64 | struct kobj_attribute *attr, |
65 | const char *buf, size_t count) |
66 | { |
67 | int ret; |
68 | |
69 | if (prof_on) |
70 | return -EEXIST; |
71 | /* |
72 | * This eventually calls into get_option() which |
73 | * has a ton of callers and is not const. It is |
74 | * easiest to cast it away here. |
75 | */ |
76 | profile_setup((char *)buf); |
77 | ret = profile_init(); |
78 | if (ret) |
79 | return ret; |
80 | ret = create_proc_profile(); |
81 | if (ret) |
82 | return ret; |
83 | return count; |
84 | } |
85 | KERNEL_ATTR_RW(profiling); |
86 | #endif |
87 | |
88 | #ifdef CONFIG_KEXEC |
89 | static ssize_t kexec_loaded_show(struct kobject *kobj, |
90 | struct kobj_attribute *attr, char *buf) |
91 | { |
92 | return sprintf(buf, "%d\n", !!kexec_image); |
93 | } |
94 | KERNEL_ATTR_RO(kexec_loaded); |
95 | |
96 | static ssize_t kexec_crash_loaded_show(struct kobject *kobj, |
97 | struct kobj_attribute *attr, char *buf) |
98 | { |
99 | return sprintf(buf, "%d\n", !!kexec_crash_image); |
100 | } |
101 | KERNEL_ATTR_RO(kexec_crash_loaded); |
102 | |
103 | static ssize_t kexec_crash_size_show(struct kobject *kobj, |
104 | struct kobj_attribute *attr, char *buf) |
105 | { |
106 | return sprintf(buf, "%zu\n", crash_get_memory_size()); |
107 | } |
108 | static ssize_t kexec_crash_size_store(struct kobject *kobj, |
109 | struct kobj_attribute *attr, |
110 | const char *buf, size_t count) |
111 | { |
112 | unsigned long cnt; |
113 | int ret; |
114 | |
115 | if (strict_strtoul(buf, 0, &cnt)) |
116 | return -EINVAL; |
117 | |
118 | ret = crash_shrink_memory(cnt); |
119 | return ret < 0 ? ret : count; |
120 | } |
121 | KERNEL_ATTR_RW(kexec_crash_size); |
122 | |
123 | static ssize_t vmcoreinfo_show(struct kobject *kobj, |
124 | struct kobj_attribute *attr, char *buf) |
125 | { |
126 | return sprintf(buf, "%lx %x\n", |
127 | paddr_vmcoreinfo_note(), |
128 | (unsigned int)vmcoreinfo_max_size); |
129 | } |
130 | KERNEL_ATTR_RO(vmcoreinfo); |
131 | |
132 | #endif /* CONFIG_KEXEC */ |
133 | |
134 | /* |
135 | * Make /sys/kernel/notes give the raw contents of our kernel .notes section. |
136 | */ |
137 | extern const void __start_notes __attribute__((weak)); |
138 | extern const void __stop_notes __attribute__((weak)); |
139 | #define notes_size (&__stop_notes - &__start_notes) |
140 | |
141 | static ssize_t notes_read(struct file *filp, struct kobject *kobj, |
142 | struct bin_attribute *bin_attr, |
143 | char *buf, loff_t off, size_t count) |
144 | { |
145 | memcpy(buf, &__start_notes + off, count); |
146 | return count; |
147 | } |
148 | |
149 | static struct bin_attribute notes_attr = { |
150 | .attr = { |
151 | .name = "notes", |
152 | .mode = S_IRUGO, |
153 | }, |
154 | .read = ¬es_read, |
155 | }; |
156 | |
157 | struct kobject *kernel_kobj; |
158 | EXPORT_SYMBOL_GPL(kernel_kobj); |
159 | |
160 | static struct attribute * kernel_attrs[] = { |
161 | #if defined(CONFIG_HOTPLUG) |
162 | &uevent_seqnum_attr.attr, |
163 | &uevent_helper_attr.attr, |
164 | #endif |
165 | #ifdef CONFIG_PROFILING |
166 | &profiling_attr.attr, |
167 | #endif |
168 | #ifdef CONFIG_KEXEC |
169 | &kexec_loaded_attr.attr, |
170 | &kexec_crash_loaded_attr.attr, |
171 | &kexec_crash_size_attr.attr, |
172 | &vmcoreinfo_attr.attr, |
173 | #endif |
174 | NULL |
175 | }; |
176 | |
177 | static struct attribute_group kernel_attr_group = { |
178 | .attrs = kernel_attrs, |
179 | }; |
180 | |
181 | static int __init ksysfs_init(void) |
182 | { |
183 | int error; |
184 | |
185 | kernel_kobj = kobject_create_and_add("kernel", NULL); |
186 | if (!kernel_kobj) { |
187 | error = -ENOMEM; |
188 | goto exit; |
189 | } |
190 | error = sysfs_create_group(kernel_kobj, &kernel_attr_group); |
191 | if (error) |
192 | goto kset_exit; |
193 | |
194 | if (notes_size > 0) { |
195 | notes_attr.size = notes_size; |
196 | error = sysfs_create_bin_file(kernel_kobj, ¬es_attr); |
197 | if (error) |
198 | goto group_exit; |
199 | } |
200 | |
201 | return 0; |
202 | |
203 | group_exit: |
204 | sysfs_remove_group(kernel_kobj, &kernel_attr_group); |
205 | kset_exit: |
206 | kobject_put(kernel_kobj); |
207 | exit: |
208 | return error; |
209 | } |
210 | |
211 | core_initcall(ksysfs_init); |
212 |
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