Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Jeff Moyer | c330dda | 2006-06-23 02:05:07 -0700 | [diff] [blame] | 16 | #include <linux/kexec.h> |
Dhaval Giani | 5cb350b | 2007-10-15 17:00:14 +0200 | [diff] [blame^] | 17 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
| 19 | #define KERNEL_ATTR_RO(_name) \ |
| 20 | static struct subsys_attribute _name##_attr = __ATTR_RO(_name) |
| 21 | |
| 22 | #define KERNEL_ATTR_RW(_name) \ |
| 23 | static struct subsys_attribute _name##_attr = \ |
| 24 | __ATTR(_name, 0644, _name##_show, _name##_store) |
| 25 | |
Andrew Morton | f125b56 | 2006-03-24 03:18:44 -0800 | [diff] [blame] | 26 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
Kay Sievers | 0f76e5a | 2005-11-11 04:58:04 +0100 | [diff] [blame] | 27 | /* current uevent sequence number */ |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 28 | static ssize_t uevent_seqnum_show(struct kset *kset, char *page) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | { |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 30 | return sprintf(page, "%llu\n", (unsigned long long)uevent_seqnum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | } |
Kay Sievers | 0f76e5a | 2005-11-11 04:58:04 +0100 | [diff] [blame] | 32 | KERNEL_ATTR_RO(uevent_seqnum); |
| 33 | |
| 34 | /* uevent helper program, used during early boo */ |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 35 | static ssize_t uevent_helper_show(struct kset *kset, char *page) |
Kay Sievers | 0f76e5a | 2005-11-11 04:58:04 +0100 | [diff] [blame] | 36 | { |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 37 | return sprintf(page, "%s\n", uevent_helper); |
Kay Sievers | 0f76e5a | 2005-11-11 04:58:04 +0100 | [diff] [blame] | 38 | } |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 39 | static ssize_t uevent_helper_store(struct kset *kset, const char *page, size_t count) |
Kay Sievers | 0f76e5a | 2005-11-11 04:58:04 +0100 | [diff] [blame] | 40 | { |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 41 | if (count+1 > UEVENT_HELPER_PATH_LEN) |
Kay Sievers | 0f76e5a | 2005-11-11 04:58:04 +0100 | [diff] [blame] | 42 | return -ENOENT; |
Kay Sievers | 312c004 | 2005-11-16 09:00:00 +0100 | [diff] [blame] | 43 | memcpy(uevent_helper, page, count); |
| 44 | uevent_helper[count] = '\0'; |
| 45 | if (count && uevent_helper[count-1] == '\n') |
| 46 | uevent_helper[count-1] = '\0'; |
Kay Sievers | 0f76e5a | 2005-11-11 04:58:04 +0100 | [diff] [blame] | 47 | return count; |
| 48 | } |
| 49 | KERNEL_ATTR_RW(uevent_helper); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #endif |
| 51 | |
Jeff Moyer | c330dda | 2006-06-23 02:05:07 -0700 | [diff] [blame] | 52 | #ifdef CONFIG_KEXEC |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 53 | static ssize_t kexec_loaded_show(struct kset *kset, char *page) |
Jeff Moyer | c330dda | 2006-06-23 02:05:07 -0700 | [diff] [blame] | 54 | { |
| 55 | return sprintf(page, "%d\n", !!kexec_image); |
| 56 | } |
| 57 | KERNEL_ATTR_RO(kexec_loaded); |
| 58 | |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 59 | static ssize_t kexec_crash_loaded_show(struct kset *kset, char *page) |
Jeff Moyer | c330dda | 2006-06-23 02:05:07 -0700 | [diff] [blame] | 60 | { |
| 61 | return sprintf(page, "%d\n", !!kexec_crash_image); |
| 62 | } |
| 63 | KERNEL_ATTR_RO(kexec_crash_loaded); |
| 64 | #endif /* CONFIG_KEXEC */ |
| 65 | |
Roland McGrath | da1a679 | 2007-07-19 01:48:39 -0700 | [diff] [blame] | 66 | /* |
| 67 | * Make /sys/kernel/notes give the raw contents of our kernel .notes section. |
| 68 | */ |
David Howells | 0b1937a | 2007-07-20 17:02:04 +0100 | [diff] [blame] | 69 | extern const void __start_notes __attribute__((weak)); |
| 70 | extern const void __stop_notes __attribute__((weak)); |
Roland McGrath | da1a679 | 2007-07-19 01:48:39 -0700 | [diff] [blame] | 71 | #define notes_size (&__stop_notes - &__start_notes) |
| 72 | |
| 73 | static ssize_t notes_read(struct kobject *kobj, struct bin_attribute *bin_attr, |
| 74 | char *buf, loff_t off, size_t count) |
| 75 | { |
| 76 | memcpy(buf, &__start_notes + off, count); |
| 77 | return count; |
| 78 | } |
| 79 | |
| 80 | static struct bin_attribute notes_attr = { |
| 81 | .attr = { |
| 82 | .name = "notes", |
| 83 | .mode = S_IRUGO, |
| 84 | }, |
| 85 | .read = ¬es_read, |
| 86 | }; |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | decl_subsys(kernel, NULL, NULL); |
| 89 | EXPORT_SYMBOL_GPL(kernel_subsys); |
| 90 | |
| 91 | static struct attribute * kernel_attrs[] = { |
Andrew Morton | f125b56 | 2006-03-24 03:18:44 -0800 | [diff] [blame] | 92 | #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET) |
Kay Sievers | 0f76e5a | 2005-11-11 04:58:04 +0100 | [diff] [blame] | 93 | &uevent_seqnum_attr.attr, |
| 94 | &uevent_helper_attr.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | #endif |
Jeff Moyer | c330dda | 2006-06-23 02:05:07 -0700 | [diff] [blame] | 96 | #ifdef CONFIG_KEXEC |
| 97 | &kexec_loaded_attr.attr, |
| 98 | &kexec_crash_loaded_attr.attr, |
| 99 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | NULL |
| 101 | }; |
| 102 | |
| 103 | static struct attribute_group kernel_attr_group = { |
| 104 | .attrs = kernel_attrs, |
| 105 | }; |
| 106 | |
| 107 | static int __init ksysfs_init(void) |
| 108 | { |
| 109 | int error = subsystem_register(&kernel_subsys); |
| 110 | if (!error) |
Greg Kroah-Hartman | 823bccf | 2007-04-13 13:15:19 -0700 | [diff] [blame] | 111 | error = sysfs_create_group(&kernel_subsys.kobj, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | &kernel_attr_group); |
| 113 | |
Roland McGrath | da1a679 | 2007-07-19 01:48:39 -0700 | [diff] [blame] | 114 | if (!error && notes_size > 0) { |
| 115 | notes_attr.size = notes_size; |
| 116 | error = sysfs_create_bin_file(&kernel_subsys.kobj, |
| 117 | ¬es_attr); |
| 118 | } |
| 119 | |
Dhaval Giani | 5cb350b | 2007-10-15 17:00:14 +0200 | [diff] [blame^] | 120 | /* |
| 121 | * Create "/sys/kernel/uids" directory and corresponding root user's |
| 122 | * directory under it. |
| 123 | */ |
| 124 | if (!error) |
| 125 | error = uids_kobject_init(); |
| 126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | return error; |
| 128 | } |
| 129 | |
| 130 | core_initcall(ksysfs_init); |