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/*
* Copyright (c) 2011-2013, The Bumblebee Project
* Author: Joaquín Ignacio Aramendía <[email protected]>
* Author: Jaron Viëtor AKA "Thulinma" <[email protected]>
*
* This file is part of Bumblebee.
*
* Bumblebee 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 3 of the License, or
* (at your option) any later version.
*
* Bumblebee 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 Bumblebee. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>
#include <libkmod.h>
#include <errno.h>
#include "module.h"
#include "bblogger.h"
#include "bbrun.h"
#include "bbconfig.h"
int module_unload_recursive(struct kmod_module *mod);
/**
* Checks whether a kernel module is loaded
*
* @param driver The name of the driver (not a filename)
* @return 1 if the module is loaded, 0 otherwise
*/
int module_is_loaded(char *driver) {
int err, state;
struct kmod_module *mod;
err = kmod_module_new_from_name(bb_status.kmod_ctx, driver, &mod);
if (err < 0) {
bb_log(LOG_DEBUG, "kmod_module_new_from_name(%s) failed (err: %d).\n",
driver, err);
return 0;
}
state = kmod_module_get_initstate(mod);
kmod_module_unref(mod);
return state == KMOD_MODULE_LIVE;
}
/**
* Attempts to load a module.
*
* @param module_name The filename of the module to be loaded
* @param driver The name of the driver to be loaded
* @return 1 if the driver is successfully loaded, 0 otherwise
*/
int module_load(char *module_name, char *driver) {
int err = 0;
int flags = KMOD_PROBE_IGNORE_LOADED;
struct kmod_list *l, *list = NULL;
if (module_is_loaded(driver) == 0) {
/* the module has not loaded yet, try to load it */
bb_log(LOG_INFO, "Loading driver '%s' (module '%s')\n", driver, module_name);
err = kmod_module_new_from_lookup(bb_status.kmod_ctx, module_name, &list);
if (err < 0) {
bb_log(LOG_DEBUG, "kmod_module_new_from_lookup(%s) failed (err: %d).\n",
module_name, err);
return 0;
}
if (list == NULL) {
bb_log(LOG_ERR, "Module '%s' not found.\n", module_name);
return 0;
}
kmod_list_foreach(l, list) {
struct kmod_module *mod = kmod_module_get_module(l);
bb_log(LOG_DEBUG, "Loading module '%s'.\n", kmod_module_get_name(mod));
err = kmod_module_probe_insert_module(mod, flags, NULL, NULL, NULL, 0);
if (err < 0) {
bb_log(LOG_DEBUG, "kmod_module_probe_insert_module(%s) failed (err: %d).\n",
kmod_module_get_name(mod), err);
}
kmod_module_unref(mod);
if (err < 0) {
break;
}
}
kmod_module_unref_list(list);
}
return err >= 0;
}
/**
* Unloads module and modules that are depending on this module.
*
* @param mod Reference to libkmod module
* @return 1 if the module is successfully unloaded, 0 otherwise
*/
int module_unload_recursive(struct kmod_module *mod) {
int err = 0, flags = 0, refcnt;
struct kmod_list *holders;
holders = kmod_module_get_holders(mod);
if (holders != NULL) {
struct kmod_list *itr;
kmod_list_foreach(itr, holders) {
struct kmod_module *hm = kmod_module_get_module(itr);
err = module_unload_recursive(hm);
kmod_module_unref(hm);
if (err < 0) {
break;
}
}
kmod_module_unref_list(holders);
}
refcnt = kmod_module_get_refcnt(mod);
if (refcnt == 0) {
bb_log(LOG_INFO, "Unloading module %s\n", kmod_module_get_name(mod));
err = kmod_module_remove_module(mod, flags);
} else {
bb_log(LOG_ERR, "Failed to unload module '%s' (ref count: %d).\n",
kmod_module_get_name(mod), refcnt);
err = 1;
}
return err == 0;
}
/**
* Attempts to unload a module if loaded.
*
* @param driver The name of the driver (not a filename)
* @return 1 if the driver is successfully unloaded, 0 otherwise
*/
int module_unload(char *driver) {
int err;
struct kmod_module *mod;
if (module_is_loaded(driver) == 1) {
err = kmod_module_new_from_name(bb_status.kmod_ctx, driver, &mod);
if (err < 0) {
bb_log(LOG_DEBUG, "kmod_module_new_from_name(%s) failed (err: %d).\n",
driver, err);
return 0;
}
err = module_unload_recursive(mod);
kmod_module_unref(mod);
return err;
}
return 1;
}
/**
* Checks whether a kernel module is available for loading
*
* @param module_name The module name to be checked (filename or alias)
* @return 1 if the module is available for loading, 0 otherwise
*/
int module_is_available(char *module_name) {
int err, available;
struct kmod_list *list = NULL;
err = kmod_module_new_from_lookup(bb_status.kmod_ctx, module_name, &list);
if (err < 0) {
bb_log(LOG_DEBUG, "kmod_module_new_from_lookup(%s) failed (err: %d).\n",
module_name, err);
return 0;
}
available = list != NULL;
kmod_module_unref_list(list);
return available;
}
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