| /* Helpers for initial module or kernel cmdline parsing |
| Copyright (C) 2001 Rusty Russell. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| #include <linux/moduleparam.h> |
| #include <linux/kernel.h> |
| #include <linux/string.h> |
| #include <linux/errno.h> |
| #include <linux/module.h> |
| #include <linux/device.h> |
| #include <linux/err.h> |
| #include <linux/slab.h> |
| #include <linux/ctype.h> |
| |
| #if 0 |
| #define DEBUGP printk |
| #else |
| #define DEBUGP(fmt, a...) |
| #endif |
| |
| /* Protects all parameters, and incidentally kmalloced_param list. */ |
| static DEFINE_MUTEX(param_lock); |
| |
| /* This just allows us to keep track of which parameters are kmalloced. */ |
| struct kmalloced_param { |
| struct list_head list; |
| char val[]; |
| }; |
| static LIST_HEAD(kmalloced_params); |
| |
| static void *kmalloc_parameter(unsigned int size) |
| { |
| struct kmalloced_param *p; |
| |
| p = kmalloc(sizeof(*p) + size, GFP_KERNEL); |
| if (!p) |
| return NULL; |
| |
| list_add(&p->list, &kmalloced_params); |
| return p->val; |
| } |
| |
| /* Does nothing if parameter wasn't kmalloced above. */ |
| static void maybe_kfree_parameter(void *param) |
| { |
| struct kmalloced_param *p; |
| |
| list_for_each_entry(p, &kmalloced_params, list) { |
| if (p->val == param) { |
| list_del(&p->list); |
| kfree(p); |
| break; |
| } |
| } |
| } |
| |
| static inline char dash2underscore(char c) |
| { |
| if (c == '-') |
| return '_'; |
| return c; |
| } |
| |
| static inline int parameq(const char *input, const char *paramname) |
| { |
| unsigned int i; |
| for (i = 0; dash2underscore(input[i]) == paramname[i]; i++) |
| if (input[i] == '\0') |
| return 1; |
| return 0; |
| } |
| |
| static int parse_one(char *param, |
| char *val, |
| const struct kernel_param *params, |
| unsigned num_params, |
| int (*handle_unknown)(char *param, char *val)) |
| { |
| unsigned int i; |
| int err; |
| |
| /* Find parameter */ |
| for (i = 0; i < num_params; i++) { |
| if (parameq(param, params[i].name)) { |
| /* No one handled NULL, so do it here. */ |
| if (!val && params[i].ops->set != param_set_bool) |
| return -EINVAL; |
| DEBUGP("They are equal! Calling %p\n", |
| params[i].ops->set); |
| mutex_lock(¶m_lock); |
| err = params[i].ops->set(val, ¶ms[i]); |
| mutex_unlock(¶m_lock); |
| return err; |
| } |
| } |
| |
| if (handle_unknown) { |
| DEBUGP("Unknown argument: calling %p\n", handle_unknown); |
| return handle_unknown(param, val); |
| } |
| |
| DEBUGP("Unknown argument `%s'\n", param); |
| return -ENOENT; |
| } |
| |
| /* You can use " around spaces, but can't escape ". */ |
| /* Hyphens and underscores equivalent in parameter names. */ |
| static char *next_arg(char *args, char **param, char **val) |
| { |
| unsigned int i, equals = 0; |
| int in_quote = 0, quoted = 0; |
| char *next; |
| |
| if (*args == '"') { |
| args++; |
| in_quote = 1; |
| quoted = 1; |
| } |
| |
| for (i = 0; args[i]; i++) { |
| if (isspace(args[i]) && !in_quote) |
| break; |
| if (equals == 0) { |
| if (args[i] == '=') |
| equals = i; |
| } |
| if (args[i] == '"') |
| in_quote = !in_quote; |
| } |
| |
| *param = args; |
| if (!equals) |
| *val = NULL; |
| else { |
| args[equals] = '\0'; |
| *val = args + equals + 1; |
| |
| /* Don't include quotes in value. */ |
| if (**val == '"') { |
| (*val)++; |
| if (args[i-1] == '"') |
| args[i-1] = '\0'; |
| } |
| if (quoted && args[i-1] == '"') |
| args[i-1] = '\0'; |
| } |
| |
| if (args[i]) { |
| args[i] = '\0'; |
| next = args + i + 1; |
| } else |
| next = args + i; |
| |
| /* Chew up trailing spaces. */ |
| return skip_spaces(next); |
| } |
| |
| /* Args looks like "foo=bar,bar2 baz=fuz wiz". */ |
| int parse_args(const char *name, |
| char *args, |
| const struct kernel_param *params, |
| unsigned num, |
| int (*unknown)(char *param, char *val)) |
| { |
| char *param, *val; |
| |
| DEBUGP("Parsing ARGS: %s\n", args); |
| |
| /* Chew leading spaces */ |
| args = skip_spaces(args); |
| |
| while (*args) { |
| int ret; |
| int irq_was_disabled; |
| |
| args = next_arg(args, ¶m, &val); |
| irq_was_disabled = irqs_disabled(); |
| ret = parse_one(param, val, params, num, unknown); |
| if (irq_was_disabled && !irqs_disabled()) { |
| printk(KERN_WARNING "parse_args(): option '%s' enabled " |
| "irq's!\n", param); |
| } |
| switch (ret) { |
| case -ENOENT: |
| printk(KERN_ERR "%s: Unknown parameter `%s'\n", |
| name, param); |
| return ret; |
| case -ENOSPC: |
| printk(KERN_ERR |
| "%s: `%s' too large for parameter `%s'\n", |
| name, val ?: "", param); |
| return ret; |
| case 0: |
| break; |
| default: |
| printk(KERN_ERR |
| "%s: `%s' invalid for parameter `%s'\n", |
| name, val ?: "", param); |
| return ret; |
| } |
| } |
| |
| /* All parsed OK. */ |
| return 0; |
| } |
| |
| /* Lazy bastard, eh? */ |
| #define STANDARD_PARAM_DEF(name, type, format, tmptype, strtolfn) \ |
| int param_set_##name(const char *val, const struct kernel_param *kp) \ |
| { \ |
| tmptype l; \ |
| int ret; \ |
| \ |
| ret = strtolfn(val, 0, &l); \ |
| if (ret == -EINVAL || ((type)l != l)) \ |
| return -EINVAL; \ |
| *((type *)kp->arg) = l; \ |
| return 0; \ |
| } \ |
| int param_get_##name(char *buffer, const struct kernel_param *kp) \ |
| { \ |
| return sprintf(buffer, format, *((type *)kp->arg)); \ |
| } \ |
| struct kernel_param_ops param_ops_##name = { \ |
| .set = param_set_##name, \ |
| .get = param_get_##name, \ |
| }; \ |
| EXPORT_SYMBOL(param_set_##name); \ |
| EXPORT_SYMBOL(param_get_##name); \ |
| EXPORT_SYMBOL(param_ops_##name) |
| |
| |
| STANDARD_PARAM_DEF(byte, unsigned char, "%c", unsigned long, strict_strtoul); |
| STANDARD_PARAM_DEF(short, short, "%hi", long, strict_strtol); |
| STANDARD_PARAM_DEF(ushort, unsigned short, "%hu", unsigned long, strict_strtoul); |
| STANDARD_PARAM_DEF(int, int, "%i", long, strict_strtol); |
| STANDARD_PARAM_DEF(uint, unsigned int, "%u", unsigned long, strict_strtoul); |
| STANDARD_PARAM_DEF(long, long, "%li", long, strict_strtol); |
| STANDARD_PARAM_DEF(ulong, unsigned long, "%lu", unsigned long, strict_strtoul); |
| |
| int param_set_charp(const char *val, const struct kernel_param *kp) |
| { |
| if (strlen(val) > 1024) { |
| printk(KERN_ERR "%s: string parameter too long\n", |
| kp->name); |
| return -ENOSPC; |
| } |
| |
| maybe_kfree_parameter(*(char **)kp->arg); |
| |
| /* This is a hack. We can't kmalloc in early boot, and we |
| * don't need to; this mangled commandline is preserved. */ |
| if (slab_is_available()) { |
| *(char **)kp->arg = kmalloc_parameter(strlen(val)+1); |
| if (!*(char **)kp->arg) |
| return -ENOMEM; |
| strcpy(*(char **)kp->arg, val); |
| } else |
| *(const char **)kp->arg = val; |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(param_set_charp); |
| |
| int param_get_charp(char *buffer, const struct kernel_param *kp) |
| { |
| return sprintf(buffer, "%s", *((char **)kp->arg)); |
| } |
| EXPORT_SYMBOL(param_get_charp); |
| |
| static void param_free_charp(void *arg) |
| { |
| maybe_kfree_parameter(*((char **)arg)); |
| } |
| |
| struct kernel_param_ops param_ops_charp = { |
| .set = param_set_charp, |
| .get = param_get_charp, |
| .free = param_free_charp, |
| }; |
| EXPORT_SYMBOL(param_ops_charp); |
| |
| /* Actually could be a bool or an int, for historical reasons. */ |
| int param_set_bool(const char *val, const struct kernel_param *kp) |
| { |
| bool v; |
| |
| /* No equals means "set"... */ |
| if (!val) val = "1"; |
| |
| /* One of =[yYnN01] */ |
| switch (val[0]) { |
| case 'y': case 'Y': case '1': |
| v = true; |
| break; |
| case 'n': case 'N': case '0': |
| v = false; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| if (kp->flags & KPARAM_ISBOOL) |
| *(bool *)kp->arg = v; |
| else |
| *(int *)kp->arg = v; |
| return 0; |
| } |
| EXPORT_SYMBOL(param_set_bool); |
| |
| int param_get_bool(char *buffer, const struct kernel_param *kp) |
| { |
| bool val; |
| if (kp->flags & KPARAM_ISBOOL) |
| val = *(bool *)kp->arg; |
| else |
| val = *(int *)kp->arg; |
| |
| /* Y and N chosen as being relatively non-coder friendly */ |
| return sprintf(buffer, "%c", val ? 'Y' : 'N'); |
| } |
| EXPORT_SYMBOL(param_get_bool); |
| |
| struct kernel_param_ops param_ops_bool = { |
| .set = param_set_bool, |
| .get = param_get_bool, |
| }; |
| EXPORT_SYMBOL(param_ops_bool); |
| |
| /* This one must be bool. */ |
| int param_set_invbool(const char *val, const struct kernel_param *kp) |
| { |
| int ret; |
| bool boolval; |
| struct kernel_param dummy; |
| |
| dummy.arg = &boolval; |
| dummy.flags = KPARAM_ISBOOL; |
| ret = param_set_bool(val, &dummy); |
| if (ret == 0) |
| *(bool *)kp->arg = !boolval; |
| return ret; |
| } |
| EXPORT_SYMBOL(param_set_invbool); |
| |
| int param_get_invbool(char *buffer, const struct kernel_param *kp) |
| { |
| return sprintf(buffer, "%c", (*(bool *)kp->arg) ? 'N' : 'Y'); |
| } |
| EXPORT_SYMBOL(param_get_invbool); |
| |
| struct kernel_param_ops param_ops_invbool = { |
| .set = param_set_invbool, |
| .get = param_get_invbool, |
| }; |
| EXPORT_SYMBOL(param_ops_invbool); |
| |
| /* We break the rule and mangle the string. */ |
| static int param_array(const char *name, |
| const char *val, |
| unsigned int min, unsigned int max, |
| void *elem, int elemsize, |
| int (*set)(const char *, const struct kernel_param *kp), |
| u16 flags, |
| unsigned int *num) |
| { |
| int ret; |
| struct kernel_param kp; |
| char save; |
| |
| /* Get the name right for errors. */ |
| kp.name = name; |
| kp.arg = elem; |
| kp.flags = flags; |
| |
| *num = 0; |
| /* We expect a comma-separated list of values. */ |
| do { |
| int len; |
| |
| if (*num == max) { |
| printk(KERN_ERR "%s: can only take %i arguments\n", |
| name, max); |
| return -EINVAL; |
| } |
| len = strcspn(val, ","); |
| |
| /* nul-terminate and parse */ |
| save = val[len]; |
| ((char *)val)[len] = '\0'; |
| BUG_ON(!mutex_is_locked(¶m_lock)); |
| ret = set(val, &kp); |
| |
| if (ret != 0) |
| return ret; |
| kp.arg += elemsize; |
| val += len+1; |
| (*num)++; |
| } while (save == ','); |
| |
| if (*num < min) { |
| printk(KERN_ERR "%s: needs at least %i arguments\n", |
| name, min); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| static int param_array_set(const char *val, const struct kernel_param *kp) |
| { |
| const struct kparam_array *arr = kp->arr; |
| unsigned int temp_num; |
| |
| return param_array(kp->name, val, 1, arr->max, arr->elem, |
| arr->elemsize, arr->ops->set, kp->flags, |
| arr->num ?: &temp_num); |
| } |
| |
| static int param_array_get(char *buffer, const struct kernel_param *kp) |
| { |
| int i, off, ret; |
| const struct kparam_array *arr = kp->arr; |
| struct kernel_param p; |
| |
| p = *kp; |
| for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) { |
| if (i) |
| buffer[off++] = ','; |
| p.arg = arr->elem + arr->elemsize * i; |
| BUG_ON(!mutex_is_locked(¶m_lock)); |
| ret = arr->ops->get(buffer + off, &p); |
| if (ret < 0) |
| return ret; |
| off += ret; |
| } |
| buffer[off] = '\0'; |
| return off; |
| } |
| |
| static void param_array_free(void *arg) |
| { |
| unsigned int i; |
| const struct kparam_array *arr = arg; |
| |
| if (arr->ops->free) |
| for (i = 0; i < (arr->num ? *arr->num : arr->max); i++) |
| arr->ops->free(arr->elem + arr->elemsize * i); |
| } |
| |
| struct kernel_param_ops param_array_ops = { |
| .set = param_array_set, |
| .get = param_array_get, |
| .free = param_array_free, |
| }; |
| EXPORT_SYMBOL(param_array_ops); |
| |
| int param_set_copystring(const char *val, const struct kernel_param *kp) |
| { |
| const struct kparam_string *kps = kp->str; |
| |
| if (strlen(val)+1 > kps->maxlen) { |
| printk(KERN_ERR "%s: string doesn't fit in %u chars.\n", |
| kp->name, kps->maxlen-1); |
| return -ENOSPC; |
| } |
| strcpy(kps->string, val); |
| return 0; |
| } |
| EXPORT_SYMBOL(param_set_copystring); |
| |
| int param_get_string(char *buffer, const struct kernel_param *kp) |
| { |
| const struct kparam_string *kps = kp->str; |
| return strlcpy(buffer, kps->string, kps->maxlen); |
| } |
| EXPORT_SYMBOL(param_get_string); |
| |
| struct kernel_param_ops param_ops_string = { |
| .set = param_set_copystring, |
| .get = param_get_string, |
| }; |
| EXPORT_SYMBOL(param_ops_string); |
| |
| /* sysfs output in /sys/modules/XYZ/parameters/ */ |
| #define to_module_attr(n) container_of(n, struct module_attribute, attr) |
| #define to_module_kobject(n) container_of(n, struct module_kobject, kobj) |
| |
| extern struct kernel_param __start___param[], __stop___param[]; |
| |
| struct param_attribute |
| { |
| struct module_attribute mattr; |
| const struct kernel_param *param; |
| }; |
| |
| struct module_param_attrs |
| { |
| unsigned int num; |
| struct attribute_group grp; |
| struct param_attribute attrs[0]; |
| }; |
| |
| #ifdef CONFIG_SYSFS |
| #define to_param_attr(n) container_of(n, struct param_attribute, mattr) |
| |
| static ssize_t param_attr_show(struct module_attribute *mattr, |
| struct module *mod, char *buf) |
| { |
| int count; |
| struct param_attribute *attribute = to_param_attr(mattr); |
| |
| if (!attribute->param->ops->get) |
| return -EPERM; |
| |
| mutex_lock(¶m_lock); |
| count = attribute->param->ops->get(buf, attribute->param); |
| mutex_unlock(¶m_lock); |
| if (count > 0) { |
| strcat(buf, "\n"); |
| ++count; |
| } |
| return count; |
| } |
| |
| /* sysfs always hands a nul-terminated string in buf. We rely on that. */ |
| static ssize_t param_attr_store(struct module_attribute *mattr, |
| struct module *owner, |
| const char *buf, size_t len) |
| { |
| int err; |
| struct param_attribute *attribute = to_param_attr(mattr); |
| |
| if (!attribute->param->ops->set) |
| return -EPERM; |
| |
| mutex_lock(¶m_lock); |
| err = attribute->param->ops->set(buf, attribute->param); |
| mutex_unlock(¶m_lock); |
| if (!err) |
| return len; |
| return err; |
| } |
| #endif |
| |
| #ifdef CONFIG_MODULES |
| #define __modinit |
| #else |
| #define __modinit __init |
| #endif |
| |
| #ifdef CONFIG_SYSFS |
| void __kernel_param_lock(void) |
| { |
| mutex_lock(¶m_lock); |
| } |
| EXPORT_SYMBOL(__kernel_param_lock); |
| |
| void __kernel_param_unlock(void) |
| { |
| mutex_unlock(¶m_lock); |
| } |
| EXPORT_SYMBOL(__kernel_param_unlock); |
| |
| /* |
| * add_sysfs_param - add a parameter to sysfs |
| * @mk: struct module_kobject |
| * @kparam: the actual parameter definition to add to sysfs |
| * @name: name of parameter |
| * |
| * Create a kobject if for a (per-module) parameter if mp NULL, and |
| * create file in sysfs. Returns an error on out of memory. Always cleans up |
| * if there's an error. |
| */ |
| static __modinit int add_sysfs_param(struct module_kobject *mk, |
| const struct kernel_param *kp, |
| const char *name) |
| { |
| struct module_param_attrs *new; |
| struct attribute **attrs; |
| int err, num; |
| |
| /* We don't bother calling this with invisible parameters. */ |
| BUG_ON(!kp->perm); |
| |
| if (!mk->mp) { |
| num = 0; |
| attrs = NULL; |
| } else { |
| num = mk->mp->num; |
| attrs = mk->mp->grp.attrs; |
| } |
| |
| /* Enlarge. */ |
| new = krealloc(mk->mp, |
| sizeof(*mk->mp) + sizeof(mk->mp->attrs[0]) * (num+1), |
| GFP_KERNEL); |
| if (!new) { |
| kfree(mk->mp); |
| err = -ENOMEM; |
| goto fail; |
| } |
| attrs = krealloc(attrs, sizeof(new->grp.attrs[0])*(num+2), GFP_KERNEL); |
| if (!attrs) { |
| err = -ENOMEM; |
| goto fail_free_new; |
| } |
| |
| /* Sysfs wants everything zeroed. */ |
| memset(new, 0, sizeof(*new)); |
| memset(&new->attrs[num], 0, sizeof(new->attrs[num])); |
| memset(&attrs[num], 0, sizeof(attrs[num])); |
| new->grp.name = "parameters"; |
| new->grp.attrs = attrs; |
| |
| /* Tack new one on the end. */ |
| sysfs_attr_init(&new->attrs[num].mattr.attr); |
| new->attrs[num].param = kp; |
| new->attrs[num].mattr.show = param_attr_show; |
| new->attrs[num].mattr.store = param_attr_store; |
| new->attrs[num].mattr.attr.name = (char *)name; |
| new->attrs[num].mattr.attr.mode = kp->perm; |
| new->num = num+1; |
| |
| /* Fix up all the pointers, since krealloc can move us */ |
| for (num = 0; num < new->num; num++) |
| new->grp.attrs[num] = &new->attrs[num].mattr.attr; |
| new->grp.attrs[num] = NULL; |
| |
| mk->mp = new; |
| return 0; |
| |
| fail_free_new: |
| kfree(new); |
| fail: |
| mk->mp = NULL; |
| return err; |
| } |
| |
| #ifdef CONFIG_MODULES |
| static void free_module_param_attrs(struct module_kobject *mk) |
| { |
| kfree(mk->mp->grp.attrs); |
| kfree(mk->mp); |
| mk->mp = NULL; |
| } |
| |
| /* |
| * module_param_sysfs_setup - setup sysfs support for one module |
| * @mod: module |
| * @kparam: module parameters (array) |
| * @num_params: number of module parameters |
| * |
| * Adds sysfs entries for module parameters under |
| * /sys/module/[mod->name]/parameters/ |
| */ |
| int module_param_sysfs_setup(struct module *mod, |
| const struct kernel_param *kparam, |
| unsigned int num_params) |
| { |
| int i, err; |
| bool params = false; |
| |
| for (i = 0; i < num_params; i++) { |
| if (kparam[i].perm == 0) |
| continue; |
| err = add_sysfs_param(&mod->mkobj, &kparam[i], kparam[i].name); |
| if (err) |
| return err; |
| params = true; |
| } |
| |
| if (!params) |
| return 0; |
| |
| /* Create the param group. */ |
| err = sysfs_create_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); |
| if (err) |
| free_module_param_attrs(&mod->mkobj); |
| return err; |
| } |
| |
| /* |
| * module_param_sysfs_remove - remove sysfs support for one module |
| * @mod: module |
| * |
| * Remove sysfs entries for module parameters and the corresponding |
| * kobject. |
| */ |
| void module_param_sysfs_remove(struct module *mod) |
| { |
| if (mod->mkobj.mp) { |
| sysfs_remove_group(&mod->mkobj.kobj, &mod->mkobj.mp->grp); |
| /* We are positive that no one is using any param |
| * attrs at this point. Deallocate immediately. */ |
| free_module_param_attrs(&mod->mkobj); |
| } |
| } |
| #endif |
| |
| void destroy_params(const struct kernel_param *params, unsigned num) |
| { |
| unsigned int i; |
| |
| for (i = 0; i < num; i++) |
| if (params[i].ops->free) |
| params[i].ops->free(params[i].arg); |
| } |
| |
| static struct module_kobject * __init locate_module_kobject(const char *name) |
| { |
| struct module_kobject *mk; |
| struct kobject *kobj; |
| int err; |
| |
| kobj = kset_find_obj(module_kset, name); |
| if (kobj) { |
| mk = to_module_kobject(kobj); |
| } else { |
| mk = kzalloc(sizeof(struct module_kobject), GFP_KERNEL); |
| BUG_ON(!mk); |
| |
| mk->mod = THIS_MODULE; |
| mk->kobj.kset = module_kset; |
| err = kobject_init_and_add(&mk->kobj, &module_ktype, NULL, |
| "%s", name); |
| if (err) { |
| kobject_put(&mk->kobj); |
| printk(KERN_ERR |
| "Module '%s' failed add to sysfs, error number %d\n", |
| name, err); |
| printk(KERN_ERR |
| "The system will be unstable now.\n"); |
| return NULL; |
| } |
| |
| /* So that we hold reference in both cases. */ |
| kobject_get(&mk->kobj); |
| } |
| |
| return mk; |
| } |
| |
| static void __init kernel_add_sysfs_param(const char *name, |
| struct kernel_param *kparam, |
| unsigned int name_skip) |
| { |
| struct module_kobject *mk; |
| int err; |
| |
| mk = locate_module_kobject(name); |
| if (!mk) |
| return; |
| |
| /* We need to remove old parameters before adding more. */ |
| if (mk->mp) |
| sysfs_remove_group(&mk->kobj, &mk->mp->grp); |
| |
| /* These should not fail at boot. */ |
| err = add_sysfs_param(mk, kparam, kparam->name + name_skip); |
| BUG_ON(err); |
| err = sysfs_create_group(&mk->kobj, &mk->mp->grp); |
| BUG_ON(err); |
| kobject_uevent(&mk->kobj, KOBJ_ADD); |
| kobject_put(&mk->kobj); |
| } |
| |
| /* |
| * param_sysfs_builtin - add contents in /sys/parameters for built-in modules |
| * |
| * Add module_parameters to sysfs for "modules" built into the kernel. |
| * |
| * The "module" name (KBUILD_MODNAME) is stored before a dot, the |
| * "parameter" name is stored behind a dot in kernel_param->name. So, |
| * extract the "module" name for all built-in kernel_param-eters, |
| * and for all who have the same, call kernel_add_sysfs_param. |
| */ |
| static void __init param_sysfs_builtin(void) |
| { |
| struct kernel_param *kp; |
| unsigned int name_len; |
| char modname[MODULE_NAME_LEN]; |
| |
| for (kp = __start___param; kp < __stop___param; kp++) { |
| char *dot; |
| |
| if (kp->perm == 0) |
| continue; |
| |
| dot = strchr(kp->name, '.'); |
| if (!dot) { |
| /* This happens for core_param() */ |
| strcpy(modname, "kernel"); |
| name_len = 0; |
| } else { |
| name_len = dot - kp->name + 1; |
| strlcpy(modname, kp->name, name_len); |
| } |
| kernel_add_sysfs_param(modname, kp, name_len); |
| } |
| } |
| |
| ssize_t __modver_version_show(struct module_attribute *mattr, |
| struct module *mod, char *buf) |
| { |
| struct module_version_attribute *vattr = |
| container_of(mattr, struct module_version_attribute, mattr); |
| |
| return sprintf(buf, "%s\n", vattr->version); |
| } |
| |
| extern struct module_version_attribute __start___modver[], __stop___modver[]; |
| |
| static void __init version_sysfs_builtin(void) |
| { |
| const struct module_version_attribute *vattr; |
| struct module_kobject *mk; |
| int err; |
| |
| for (vattr = __start___modver; vattr < __stop___modver; vattr++) { |
| mk = locate_module_kobject(vattr->module_name); |
| if (mk) { |
| err = sysfs_create_file(&mk->kobj, &vattr->mattr.attr); |
| kobject_uevent(&mk->kobj, KOBJ_ADD); |
| kobject_put(&mk->kobj); |
| } |
| } |
| } |
| |
| /* module-related sysfs stuff */ |
| |
| static ssize_t module_attr_show(struct kobject *kobj, |
| struct attribute *attr, |
| char *buf) |
| { |
| struct module_attribute *attribute; |
| struct module_kobject *mk; |
| int ret; |
| |
| attribute = to_module_attr(attr); |
| mk = to_module_kobject(kobj); |
| |
| if (!attribute->show) |
| return -EIO; |
| |
| ret = attribute->show(attribute, mk->mod, buf); |
| |
| return ret; |
| } |
| |
| static ssize_t module_attr_store(struct kobject *kobj, |
| struct attribute *attr, |
| const char *buf, size_t len) |
| { |
| struct module_attribute *attribute; |
| struct module_kobject *mk; |
| int ret; |
| |
| attribute = to_module_attr(attr); |
| mk = to_module_kobject(kobj); |
| |
| if (!attribute->store) |
| return -EIO; |
| |
| ret = attribute->store(attribute, mk->mod, buf, len); |
| |
| return ret; |
| } |
| |
| static const struct sysfs_ops module_sysfs_ops = { |
| .show = module_attr_show, |
| .store = module_attr_store, |
| }; |
| |
| static int uevent_filter(struct kset *kset, struct kobject *kobj) |
| { |
| struct kobj_type *ktype = get_ktype(kobj); |
| |
| if (ktype == &module_ktype) |
| return 1; |
| return 0; |
| } |
| |
| static const struct kset_uevent_ops module_uevent_ops = { |
| .filter = uevent_filter, |
| }; |
| |
| struct kset *module_kset; |
| int module_sysfs_initialized; |
| |
| struct kobj_type module_ktype = { |
| .sysfs_ops = &module_sysfs_ops, |
| }; |
| |
| /* |
| * param_sysfs_init - wrapper for built-in params support |
| */ |
| static int __init param_sysfs_init(void) |
| { |
| module_kset = kset_create_and_add("module", &module_uevent_ops, NULL); |
| if (!module_kset) { |
| printk(KERN_WARNING "%s (%d): error creating kset\n", |
| __FILE__, __LINE__); |
| return -ENOMEM; |
| } |
| module_sysfs_initialized = 1; |
| |
| version_sysfs_builtin(); |
| param_sysfs_builtin(); |
| |
| return 0; |
| } |
| subsys_initcall(param_sysfs_init); |
| |
| #endif /* CONFIG_SYSFS */ |