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/*
* Copyright (C) 2013-2021 Canonical, Ltd.
* Copyright (C) 2022-2025 Colin Ian King.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "stress-ng.h"
#include "core-module.h"
#if defined(HAVE_LIBKMOD_H) && \
defined(HAVE_LIB_KMOD) && \
defined(__linux__)
#include <libkmod.h>
/*
* stress_module_load()
* load a linux kernel module
*/
int stress_module_load(
const char *name, /* name of stressor */
const char *alias, /* name of module */
const char *options, /* module options */
bool *already_loaded) /* set to true if already loaded */
{
int ret;
unsigned int flags = 0;
struct kmod_ctx *ctx;
struct kmod_list const *l;
struct kmod_list *list = NULL;
void (*show_func)(struct kmod_module *m, bool install,
const char *options) = NULL;
*already_loaded = false;
ctx = kmod_new(NULL, NULL);
if (!ctx)
return -1;
ret = kmod_module_new_from_lookup(ctx, alias, &list);
if (!list || ret < 0) {
kmod_unref(ctx);
return -1;
}
kmod_list_foreach(l, list) {
struct kmod_module *mod = kmod_module_get_module(l);
if (!mod)
continue;
ret = kmod_module_probe_insert_module(mod, flags, options,
NULL, NULL, show_func);
if (ret < 0) {
if (errno == -EEXIST) {
*already_loaded = true;
kmod_unref(ctx);
return 0;
}
pr_inf("%s: failed to load module %s, errno=%d (%s)\n",
name, alias,
errno, strerror(errno));
ret = -1;
break;
}
kmod_module_unref(mod);
}
kmod_module_unref_list(list);
kmod_unref(ctx);
return ret;
}
/*
* stress_module_unload_mod_and_deps()
* recursively unload module and dependencies
*/
static int stress_module_unload_mod_and_deps(struct kmod_module *mod)
{
int ret;
struct kmod_list *deps, *l;
ret = kmod_module_remove_module(mod, 0);
deps = kmod_module_get_dependencies(mod);
if (!deps)
return ret;
kmod_list_foreach(l, deps) {
struct kmod_module *dep_mod = kmod_module_get_module(l);
if (kmod_module_get_refcnt(dep_mod) == 0)
stress_module_unload_mod_and_deps(dep_mod);
kmod_module_unref_list(deps);
}
return ret;
}
/*
* stress_module_unload()
* unload a linux kernel module
*/
int stress_module_unload(
const char *name, /* name of stressor */
const char *alias, /* name of module */
const bool already_loaded) /* don't unload if true */
{
int ret;
struct kmod_list *l, *list = NULL;
struct kmod_ctx *ctx;
if (already_loaded)
return 0;
ctx = kmod_new(NULL, NULL);
if (!ctx)
return -1;
ret = kmod_module_new_from_lookup(ctx, alias, &list);
if (ret < 0) {
kmod_unref(ctx);
return -1;
}
if (!list) {
pr_dbg("%s: module %s not found\n",
name, name);
kmod_unref(ctx);
return -1;
}
kmod_list_foreach(l, list) {
struct kmod_module *mod = kmod_module_get_module(l);
const char *module_name = kmod_module_get_name(mod);
if (!mod)
continue;
ret = kmod_module_get_initstate(mod);
if (ret < 0)
continue;
if (ret == KMOD_MODULE_BUILTIN)
continue;
ret = kmod_module_get_refcnt(mod);
if (ret > 0) {
pr_dbg("%s: cannot unload %s, it is in use\n",
name, module_name);
}
VOID_RET(int, stress_module_unload_mod_and_deps(mod));
}
kmod_module_unref_list(list);
kmod_unref(ctx);
return 0;
}
#else
int stress_module_load(
const char *name,
const char *alias,
const char *options,
bool *already_loaded)
{
(void)alias;
(void)options;
(void)already_loaded;
pr_dbg("%s: module loading not supported\n", name);
return -1;
}
int stress_module_unload(
const char *name,
const char *alias,
const bool already_loaded)
{
(void)alias;
(void)already_loaded;
pr_dbg("%s: module unloading not supported\n", name);
return -1;
}
UNEXPECTED
#endif
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