ksysfs.c

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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 (strict_strtoul(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 = &notes_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, &notes_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);

Cache object: abb7cab1667c8208003bb3cc7e262261

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FreeBSD/Linux Kernel Cross Reference sys/kernel/ksysfs.c

FreeBSD/Linux Kernel Cross Reference
sys/kernel/ksysfs.c