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