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269 lines
6.3 KiB
269 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* kernel/ksysfs.c - sysfs attributes in /sys/kernel, which |
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* are not related to any other subsystem |
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* |
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* Copyright (C) 2004 Kay Sievers <[email protected]> |
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*/ |
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#include <linux/kobject.h> |
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#include <linux/string.h> |
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#include <linux/sysfs.h> |
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#include <linux/export.h> |
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#include <linux/init.h> |
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#include <linux/kexec.h> |
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#include <linux/profile.h> |
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#include <linux/stat.h> |
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#include <linux/sched.h> |
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#include <linux/capability.h> |
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#include <linux/compiler.h> |
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#include <linux/rcupdate.h> /* rcu_expedited and rcu_normal */ |
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#define KERNEL_ATTR_RO(_name) \ |
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static struct kobj_attribute _name##_attr = __ATTR_RO(_name) |
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#define KERNEL_ATTR_RW(_name) \ |
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static struct kobj_attribute _name##_attr = \ |
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__ATTR(_name, 0644, _name##_show, _name##_store) |
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/* current uevent sequence number */ |
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static ssize_t uevent_seqnum_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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return sprintf(buf, "%llu\n", (unsigned long long)uevent_seqnum); |
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} |
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KERNEL_ATTR_RO(uevent_seqnum); |
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#ifdef CONFIG_UEVENT_HELPER |
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/* uevent helper program, used during early boot */ |
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static ssize_t uevent_helper_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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return sprintf(buf, "%s\n", uevent_helper); |
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} |
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static ssize_t uevent_helper_store(struct kobject *kobj, |
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struct kobj_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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if (count+1 > UEVENT_HELPER_PATH_LEN) |
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return -ENOENT; |
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memcpy(uevent_helper, buf, count); |
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uevent_helper[count] = '\0'; |
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if (count && uevent_helper[count-1] == '\n') |
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uevent_helper[count-1] = '\0'; |
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return count; |
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} |
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KERNEL_ATTR_RW(uevent_helper); |
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#endif |
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#ifdef CONFIG_PROFILING |
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static ssize_t profiling_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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return sprintf(buf, "%d\n", prof_on); |
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} |
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static ssize_t profiling_store(struct kobject *kobj, |
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struct kobj_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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int ret; |
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if (prof_on) |
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return -EEXIST; |
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/* |
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* This eventually calls into get_option() which |
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* has a ton of callers and is not const. It is |
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* easiest to cast it away here. |
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*/ |
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profile_setup((char *)buf); |
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ret = profile_init(); |
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if (ret) |
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return ret; |
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ret = create_proc_profile(); |
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if (ret) |
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return ret; |
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return count; |
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} |
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KERNEL_ATTR_RW(profiling); |
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#endif |
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#ifdef CONFIG_KEXEC_CORE |
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static ssize_t kexec_loaded_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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return sprintf(buf, "%d\n", !!kexec_image); |
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} |
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KERNEL_ATTR_RO(kexec_loaded); |
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static ssize_t kexec_crash_loaded_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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return sprintf(buf, "%d\n", kexec_crash_loaded()); |
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} |
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KERNEL_ATTR_RO(kexec_crash_loaded); |
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static ssize_t kexec_crash_size_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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return sprintf(buf, "%zu\n", crash_get_memory_size()); |
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} |
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static ssize_t kexec_crash_size_store(struct kobject *kobj, |
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struct kobj_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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unsigned long cnt; |
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int ret; |
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if (kstrtoul(buf, 0, &cnt)) |
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return -EINVAL; |
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ret = crash_shrink_memory(cnt); |
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return ret < 0 ? ret : count; |
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} |
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KERNEL_ATTR_RW(kexec_crash_size); |
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#endif /* CONFIG_KEXEC_CORE */ |
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#ifdef CONFIG_CRASH_CORE |
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static ssize_t vmcoreinfo_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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phys_addr_t vmcore_base = paddr_vmcoreinfo_note(); |
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return sprintf(buf, "%pa %x\n", &vmcore_base, |
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(unsigned int)VMCOREINFO_NOTE_SIZE); |
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} |
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KERNEL_ATTR_RO(vmcoreinfo); |
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#endif /* CONFIG_CRASH_CORE */ |
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/* whether file capabilities are enabled */ |
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static ssize_t fscaps_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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return sprintf(buf, "%d\n", file_caps_enabled); |
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} |
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KERNEL_ATTR_RO(fscaps); |
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#ifndef CONFIG_TINY_RCU |
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int rcu_expedited; |
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static ssize_t rcu_expedited_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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return sprintf(buf, "%d\n", READ_ONCE(rcu_expedited)); |
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} |
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static ssize_t rcu_expedited_store(struct kobject *kobj, |
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struct kobj_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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if (kstrtoint(buf, 0, &rcu_expedited)) |
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return -EINVAL; |
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return count; |
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} |
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KERNEL_ATTR_RW(rcu_expedited); |
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int rcu_normal; |
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static ssize_t rcu_normal_show(struct kobject *kobj, |
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struct kobj_attribute *attr, char *buf) |
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{ |
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return sprintf(buf, "%d\n", READ_ONCE(rcu_normal)); |
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} |
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static ssize_t rcu_normal_store(struct kobject *kobj, |
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struct kobj_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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if (kstrtoint(buf, 0, &rcu_normal)) |
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return -EINVAL; |
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return count; |
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} |
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KERNEL_ATTR_RW(rcu_normal); |
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#endif /* #ifndef CONFIG_TINY_RCU */ |
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/* |
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* Make /sys/kernel/notes give the raw contents of our kernel .notes section. |
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*/ |
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extern const void __start_notes __weak; |
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extern const void __stop_notes __weak; |
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#define notes_size (&__stop_notes - &__start_notes) |
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static ssize_t notes_read(struct file *filp, struct kobject *kobj, |
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struct bin_attribute *bin_attr, |
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char *buf, loff_t off, size_t count) |
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{ |
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memcpy(buf, &__start_notes + off, count); |
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return count; |
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} |
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static struct bin_attribute notes_attr __ro_after_init = { |
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.attr = { |
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.name = "notes", |
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.mode = S_IRUGO, |
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}, |
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.read = ¬es_read, |
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}; |
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struct kobject *kernel_kobj; |
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EXPORT_SYMBOL_GPL(kernel_kobj); |
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static struct attribute * kernel_attrs[] = { |
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&fscaps_attr.attr, |
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&uevent_seqnum_attr.attr, |
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#ifdef CONFIG_UEVENT_HELPER |
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&uevent_helper_attr.attr, |
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#endif |
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#ifdef CONFIG_PROFILING |
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&profiling_attr.attr, |
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#endif |
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#ifdef CONFIG_KEXEC_CORE |
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&kexec_loaded_attr.attr, |
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&kexec_crash_loaded_attr.attr, |
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&kexec_crash_size_attr.attr, |
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#endif |
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#ifdef CONFIG_CRASH_CORE |
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&vmcoreinfo_attr.attr, |
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#endif |
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#ifndef CONFIG_TINY_RCU |
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&rcu_expedited_attr.attr, |
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&rcu_normal_attr.attr, |
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#endif |
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NULL |
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}; |
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static const struct attribute_group kernel_attr_group = { |
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.attrs = kernel_attrs, |
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}; |
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static int __init ksysfs_init(void) |
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{ |
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int error; |
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kernel_kobj = kobject_create_and_add("kernel", NULL); |
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if (!kernel_kobj) { |
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error = -ENOMEM; |
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goto exit; |
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} |
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error = sysfs_create_group(kernel_kobj, &kernel_attr_group); |
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if (error) |
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goto kset_exit; |
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if (notes_size > 0) { |
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notes_attr.size = notes_size; |
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error = sysfs_create_bin_file(kernel_kobj, ¬es_attr); |
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if (error) |
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goto group_exit; |
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} |
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return 0; |
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group_exit: |
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sysfs_remove_group(kernel_kobj, &kernel_attr_group); |
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kset_exit: |
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kobject_put(kernel_kobj); |
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exit: |
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return error; |
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} |
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core_initcall(ksysfs_init);
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