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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247// SPDX-License-Identifier: GPL-2.0-only/* * kernel/ksysfs.c - sysfs attributes in /sys/kernel, which * are not related to any other subsystem * * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> */
#include <asm/byteorder.h>#include <linux/kobject.h>#include <linux/ksysfs.h>#include <linux/string.h>#include <linux/sysfs.h>#include <linux/export.h>#include <linux/init.h>#include <linux/vmcore_info.h>#include <linux/profile.h>#include <linux/stat.h>#include <linux/sched.h>#include <linux/capability.h>#include <linux/compiler.h>
#include <linux/rcupdate.h> /* rcu_expedited and rcu_normal */
#if defined(__LITTLE_ENDIAN)#define CPU_BYTEORDER_STRING "little"#elif defined(__BIG_ENDIAN)#define CPU_BYTEORDER_STRING "big"#else#error Unknown byteorder#endif
#define KERNEL_ATTR_RO(_name) \static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
#define KERNEL_ATTR_RW(_name) \static struct kobj_attribute _name##_attr = __ATTR_RW(_name)
/* current uevent sequence number */static ssize_t uevent_seqnum_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf){ return sysfs_emit(buf, "%llu\n", (u64)atomic64_read(&uevent_seqnum));}KERNEL_ATTR_RO(uevent_seqnum);
/* cpu byteorder */static ssize_t cpu_byteorder_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf){ return sysfs_emit(buf, "%s\n", CPU_BYTEORDER_STRING);}KERNEL_ATTR_RO(cpu_byteorder);
/* address bits */static ssize_t address_bits_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf){ return sysfs_emit(buf, "%zu\n", sizeof(void *) * 8 /* CHAR_BIT */);}KERNEL_ATTR_RO(address_bits);
#ifdef CONFIG_UEVENT_HELPER/* uevent helper program, used during early boot */static ssize_t uevent_helper_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf){ return sysfs_emit(buf, "%s\n", uevent_helper);}static ssize_t uevent_helper_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count){ if (count+1 > UEVENT_HELPER_PATH_LEN) return -ENOENT; memcpy(uevent_helper, buf, count); uevent_helper[count] = '\0'; if (count && uevent_helper[count-1] == '\n') uevent_helper[count-1] = '\0'; return count;}KERNEL_ATTR_RW(uevent_helper);#endif
#ifdef CONFIG_PROFILINGstatic ssize_t profiling_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf){ return sysfs_emit(buf, "%d\n", prof_on);}static ssize_t profiling_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count){ int ret; static DEFINE_MUTEX(lock);
/* * We need serialization, for profile_setup() initializes prof_on * value and profile_init() must not reallocate prof_buffer after * once allocated. */ guard(mutex)(&lock); if (prof_on) return -EEXIST; /* * This eventually calls into get_option() which * has a ton of callers and is not const. It is * easiest to cast it away here. */ profile_setup((char *)buf); ret = profile_init(); if (ret) return ret; ret = create_proc_profile(); if (ret) return ret; return count;}KERNEL_ATTR_RW(profiling);#endif
#ifdef CONFIG_VMCORE_INFO
static ssize_t vmcoreinfo_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf){ phys_addr_t vmcore_base = paddr_vmcoreinfo_note(); return sysfs_emit(buf, "%pa %x\n", &vmcore_base, (unsigned int)VMCOREINFO_NOTE_SIZE);}KERNEL_ATTR_RO(vmcoreinfo);
#endif /* CONFIG_VMCORE_INFO */
/* whether file capabilities are enabled */static ssize_t fscaps_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf){ return sysfs_emit(buf, "%d\n", file_caps_enabled);}KERNEL_ATTR_RO(fscaps);
#ifndef CONFIG_TINY_RCUint rcu_expedited;static ssize_t rcu_expedited_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf){ return sysfs_emit(buf, "%d\n", READ_ONCE(rcu_expedited));}static ssize_t rcu_expedited_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count){ if (kstrtoint(buf, 0, &rcu_expedited)) return -EINVAL;
return count;}KERNEL_ATTR_RW(rcu_expedited);
int rcu_normal;static ssize_t rcu_normal_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf){ return sysfs_emit(buf, "%d\n", READ_ONCE(rcu_normal));}static ssize_t rcu_normal_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count){ if (kstrtoint(buf, 0, &rcu_normal)) return -EINVAL;
return count;}KERNEL_ATTR_RW(rcu_normal);#endif /* #ifndef CONFIG_TINY_RCU */
/* * Make /sys/kernel/notes give the raw contents of our kernel .notes section. */extern const void __start_notes;extern const void __stop_notes;#define notes_size (&__stop_notes - &__start_notes)
static __ro_after_init BIN_ATTR_SIMPLE_RO(notes);
struct kobject *kernel_kobj;EXPORT_SYMBOL_GPL(kernel_kobj);
static struct attribute * kernel_attrs[] = { &fscaps_attr.attr, &uevent_seqnum_attr.attr, &cpu_byteorder_attr.attr, &address_bits_attr.attr,#ifdef CONFIG_UEVENT_HELPER &uevent_helper_attr.attr,#endif#ifdef CONFIG_PROFILING &profiling_attr.attr,#endif#ifdef CONFIG_VMCORE_INFO &vmcoreinfo_attr.attr,#endif#ifndef CONFIG_TINY_RCU &rcu_expedited_attr.attr, &rcu_normal_attr.attr,#endif NULL};
static const struct attribute_group kernel_attr_group = { .attrs = kernel_attrs,};
void __init ksysfs_init(void){ int error;
kernel_kobj = kobject_create_and_add("kernel", NULL); if (!kernel_kobj) { error = -ENOMEM; goto exit; } error = sysfs_create_group(kernel_kobj, &kernel_attr_group); if (error) goto kset_exit;
if (notes_size > 0) { bin_attr_notes.private = (void *)&__start_notes; bin_attr_notes.size = notes_size; error = sysfs_create_bin_file(kernel_kobj, &bin_attr_notes); if (error) goto group_exit; }
return;
group_exit: sysfs_remove_group(kernel_kobj, &kernel_attr_group);kset_exit: kobject_put(kernel_kobj);exit: pr_err("failed to initialize the kernel kobject: %d\n", error);}