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/config.h>
#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>
#if 0
#define DEBUGP printk
struct kparam_array *arr = kp->arg;
return param_array(kp->name, val, 1, arr->max, arr->elem,
- arr->elemsize, arr->set, arr->num);
+ arr->elemsize, arr->set, arr->num ?: &arr->max);
}
int param_array_get(char *buffer, struct kernel_param *kp)
struct kernel_param p;
p = *kp;
- for (i = off = 0; i < *arr->num; i++) {
+ for (i = off = 0; i < (arr->num ? *arr->num : arr->max); i++) {
if (i)
buffer[off++] = ',';
p.arg = arr->elem + arr->elemsize * i;
return strlcpy(buffer, kps->string, kps->maxlen);
}
+/* sysfs output in /sys/modules/XYZ/parameters/ */
+
+extern struct kernel_param __start___param[], __stop___param[];
+
+#define MAX_KBUILD_MODNAME KOBJ_NAME_LEN
+
+struct param_attribute
+{
+ struct attribute attr;
+ struct kernel_param *param;
+};
+
+struct param_kobject
+{
+ struct kobject kobj;
+
+ unsigned int num_attributes;
+ struct param_attribute attr[0];
+};
+
+#define to_param_attr(n) container_of(n, struct param_attribute, attr);
+
+static ssize_t param_attr_show(struct kobject *kobj,
+ struct attribute *attr,
+ char *buf)
+{
+ int count;
+ struct param_attribute *attribute = to_param_attr(attr);
+
+ if (!attribute->param->get)
+ return -EPERM;
+
+ count = attribute->param->get(buf, attribute->param);
+ 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 kobject *kobj,
+ struct attribute *attr,
+ const char *buf, size_t len)
+{
+ int err;
+ struct param_attribute *attribute = to_param_attr(attr);
+
+ if (!attribute->param->set)
+ return -EPERM;
+
+ err = attribute->param->set(buf, attribute->param);
+ if (!err)
+ return len;
+ return err;
+}
+
+
+static struct sysfs_ops param_sysfs_ops = {
+ .show = param_attr_show,
+ .store = param_attr_store,
+};
+
+static void param_kobj_release(struct kobject *kobj)
+{
+ kfree(container_of(kobj, struct param_kobject, kobj));
+}
+
+static struct kobj_type param_ktype = {
+ .sysfs_ops = ¶m_sysfs_ops,
+ .release = ¶m_kobj_release,
+};
+
+static struct kset param_kset = {
+ .subsys = &module_subsys,
+ .ktype = ¶m_ktype,
+};
+
+#ifdef CONFIG_MODULES
+#define __modinit
+#else
+#define __modinit __init
+#endif
+
+/*
+ * param_add_attribute - actually adds an parameter to sysfs
+ * @mod: owner of parameter
+ * @pk: param_kobject the attribute shall be assigned to.
+ * One per module, one per KBUILD_MODNAME.
+ * @kp: kernel_param to be added
+ * @skip: offset where the parameter name start in kp->name.
+ * Needed for built-in modules
+ *
+ * Fill in data into appropriate &pk->attr[], and create sysfs file.
+ */
+static __modinit int param_add_attribute(struct module *mod,
+ struct param_kobject *pk,
+ struct kernel_param *kp,
+ unsigned int skip)
+{
+ struct param_attribute *a;
+ int err;
+
+ a = &pk->attr[pk->num_attributes];
+ a->attr.name = (char *) &kp->name[skip];
+ a->attr.owner = mod;
+ a->attr.mode = kp->perm;
+ a->param = kp;
+ err = sysfs_create_file(&pk->kobj, &a->attr);
+ if (!err)
+ pk->num_attributes++;
+ return err;
+}
+
+/*
+ * param_sysfs_remove - remove sysfs support for one module or KBUILD_MODNAME
+ * @pk: struct param_kobject which is to be removed
+ *
+ * Called when an error in registration occurs or a module is removed
+ * from the system.
+ */
+static __modinit void param_sysfs_remove(struct param_kobject *pk)
+{
+ unsigned int i;
+ for (i = 0; i < pk->num_attributes; i++)
+ sysfs_remove_file(&pk->kobj,&pk->attr[i].attr);
+
+ /* Calls param_kobj_release */
+ kobject_unregister(&pk->kobj);
+}
+
+
+/*
+ * param_sysfs_setup - setup sysfs support for one module or KBUILD_MODNAME
+ * @mk: struct module_kobject (contains parent kobject)
+ * @kparam: array of struct kernel_param, the actual parameter definitions
+ * @num_params: number of entries in array
+ * @name_skip: offset where the parameter name start in kparam[].name. Needed for built-in "modules"
+ *
+ * Create a kobject for a (per-module) group of parameters, and create files
+ * in sysfs. A pointer to the param_kobject is returned on success,
+ * NULL if there's no parameter to export, or other ERR_PTR(err).
+ */
+static __modinit struct param_kobject *
+param_sysfs_setup(struct module_kobject *mk,
+ struct kernel_param *kparam,
+ unsigned int num_params,
+ unsigned int name_skip)
+{
+ struct param_kobject *pk;
+ unsigned int valid_attrs = 0;
+ unsigned int i;
+ int err;
+
+ for (i=0; i<num_params; i++) {
+ if (kparam[i].perm)
+ valid_attrs++;
+ }
+
+ if (!valid_attrs)
+ return NULL;
+
+ pk = kmalloc(sizeof(struct param_kobject)
+ + sizeof(struct param_attribute) * valid_attrs,
+ GFP_KERNEL);
+ if (!pk)
+ return ERR_PTR(-ENOMEM);
+ memset(pk, 0, sizeof(struct param_kobject)
+ + sizeof(struct param_attribute) * valid_attrs);
+
+ err = kobject_set_name(&pk->kobj, "parameters");
+ if (err)
+ goto out;
+
+ pk->kobj.kset = ¶m_kset;
+ pk->kobj.parent = &mk->kobj;
+ err = kobject_register(&pk->kobj);
+ if (err)
+ goto out;
+
+ for (i = 0; i < num_params; i++) {
+ if (kparam[i].perm) {
+ err = param_add_attribute(mk->mod, pk,
+ &kparam[i], name_skip);
+ if (err)
+ goto out_unreg;
+ }
+ }
+
+ return pk;
+
+out_unreg:
+ param_sysfs_remove(pk);
+ return ERR_PTR(err);
+
+out:
+ kfree(pk);
+ return ERR_PTR(err);
+}
+
+
+#ifdef CONFIG_MODULES
+
+/*
+ * 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, and creates a link from
+ * /sys/module/[mod->name]/parameters to /sys/parameters/[mod->name]/
+ */
+int module_param_sysfs_setup(struct module *mod,
+ struct kernel_param *kparam,
+ unsigned int num_params)
+{
+ struct param_kobject *pk;
+
+ pk = param_sysfs_setup(mod->mkobj, kparam, num_params, 0);
+ if (IS_ERR(pk))
+ return PTR_ERR(pk);
+
+ mod->params_kobject = pk;
+ return 0;
+}
+
+/*
+ * 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->params_kobject) {
+ param_sysfs_remove(mod->params_kobject);
+ mod->params_kobject = NULL;
+ }
+}
+#endif
+
+/*
+ * kernel_param_sysfs_setup - wrapper for built-in params support
+ */
+static void __init kernel_param_sysfs_setup(const char *name,
+ struct kernel_param *kparam,
+ unsigned int num_params,
+ unsigned int name_skip)
+{
+ struct module_kobject *mk;
+
+ mk = kmalloc(sizeof(struct module_kobject), GFP_KERNEL);
+ memset(mk, 0, sizeof(struct module_kobject));
+
+ mk->mod = THIS_MODULE;
+ kobj_set_kset_s(mk, module_subsys);
+ kobject_set_name(&mk->kobj, name);
+ kobject_register(&mk->kobj);
+
+ /* no need to keep the kobject if no parameter is exported */
+ if (!param_sysfs_setup(mk, kparam, num_params, name_skip))
+ kobject_unregister(&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_param_sysfs_setup.
+ */
+static void __init param_sysfs_builtin(void)
+{
+ struct kernel_param *kp, *kp_begin = NULL;
+ unsigned int i, name_len, count = 0;
+ char modname[MAX_KBUILD_MODNAME + 1] = "";
+
+ for (i=0; i < __stop___param - __start___param; i++) {
+ char *dot;
+
+ kp = &__start___param[i];
+
+ /* We do not handle args without periods. */
+ dot = memchr(kp->name, '.', MAX_KBUILD_MODNAME);
+ if (!dot) {
+ DEBUGP("couldn't find period in %s\n", kp->name);
+ continue;
+ }
+ name_len = dot - kp->name;
+
+ /* new kbuild_modname? */
+ if (strlen(modname) != name_len
+ || strncmp(modname, kp->name, name_len) != 0) {
+ /* add a new kobject for previous kernel_params. */
+ if (count)
+ kernel_param_sysfs_setup(modname,
+ kp_begin,
+ count,
+ strlen(modname)+1);
+
+ strncpy(modname, kp->name, name_len);
+ modname[name_len] = '\0';
+ count = 0;
+ kp_begin = kp;
+ }
+ count++;
+ }
+
+ /* last kernel_params need to be registered as well */
+ if (count)
+ kernel_param_sysfs_setup(modname, kp_begin, count,
+ strlen(modname)+1);
+}
+
+
+/* module-related sysfs stuff */
+#ifdef CONFIG_MODULES
+
+#define to_module_attr(n) container_of(n, struct module_attribute, attr);
+#define to_module_kobject(n) container_of(n, struct module_kobject, kobj);
+
+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 -EPERM;
+
+ if (!try_module_get(mk->mod))
+ return -ENODEV;
+
+ ret = attribute->show(mk->mod, buf);
+
+ module_put(mk->mod);
+
+ return ret;
+}
+
+static struct sysfs_ops module_sysfs_ops = {
+ .show = module_attr_show,
+ .store = NULL,
+};
+
+#else
+static struct sysfs_ops module_sysfs_ops = {
+ .show = NULL,
+ .store = NULL,
+};
+#endif
+
+static void module_kobj_release(struct kobject *kobj)
+{
+ kfree(container_of(kobj, struct module_kobject, kobj));
+}
+
+static struct kobj_type module_ktype = {
+ .sysfs_ops = &module_sysfs_ops,
+ .release = &module_kobj_release,
+};
+
+decl_subsys(module, &module_ktype, NULL);
+
+/*
+ * param_sysfs_init - wrapper for built-in params support
+ */
+static int __init param_sysfs_init(void)
+{
+ subsystem_register(&module_subsys);
+ kobject_set_name(¶m_kset.kobj, "parameters");
+ kset_init(¶m_kset);
+
+ param_sysfs_builtin();
+
+ return 0;
+}
+__initcall(param_sysfs_init);
+
EXPORT_SYMBOL(param_set_byte);
EXPORT_SYMBOL(param_get_byte);
EXPORT_SYMBOL(param_set_short);
git://git.onelab.eu / linux-2.6.git / blobdiff