* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
+/**
+ * @file modprobe.c
+ *
+ * @brief modprobe related functions.
+ *
+ */
+
#define _LGPL_SOURCE
#include <assert.h>
#include <stdio.h>
#include "modprobe.h"
#include "kern-modules.h"
+#include "lttng-sessiond.h"
#define LTTNG_MOD_REQUIRED 1
#define LTTNG_MOD_OPTIONAL 0
{ "lttng-probe-ext3" },
{ "lttng-probe-ext4" },
{ "lttng-probe-gpio" },
+ { "lttng-probe-i2c" },
{ "lttng-probe-irq" },
{ "lttng-probe-jbd" },
{ "lttng-probe-jbd2" },
#if HAVE_KMOD
#include <libkmod.h>
+/**
+ * @brief Logging function for libkmod integration.
+ */
static void log_kmod(void *data, int priority, const char *file, int line,
const char *fn, const char *format, va_list args)
{
free(str);
}
+/**
+ * @brief Setup the libkmod context.
+ *
+ * Create the context, add a custom logging function and preload the
+ * ressources for faster operation.
+ *
+ * @returns \c 0 on success
+ * \c < 0 on error
+ */
static int setup_kmod_ctx(struct kmod_ctx **ctx)
{
int ret = 0;
return ret;
}
+/**
+ * @brief Loads the kernel modules in \p modules
+ *
+ * @param modules List of modules to load
+ * @param entries Number of modules in the list
+ * @param required Are the modules required or optionnal
+ *
+ * If the modules are required, we will return with error after the
+ * first failed module load, otherwise we continue loading.
+ *
+ * @returns \c 0 on success
+ * \c < 0 on error
+ */
static int modprobe_lttng(struct kern_modules_param *modules,
int entries, int required)
{
goto error;
}
- ret = kmod_module_probe_insert_module(mod, KMOD_PROBE_IGNORE_LOADED,
+ ret = kmod_module_probe_insert_module(mod, 0,
NULL, NULL, NULL, NULL);
- if (ret < 0) {
+ if (ret == -EEXIST) {
+ DBG("Module %s is already loaded", modules[i].name);
+ ret = 0;
+ } else if (ret < 0) {
if (required) {
ERR("Unable to load required module %s",
modules[i].name);
}
} else {
DBG("Modprobe successfully %s", modules[i].name);
+ modules[i].loaded = true;
}
kmod_module_unref(mod);
return ret;
}
+/**
+ * @brief Recursively unload modules.
+ *
+ * This function implements the same modules unloading behavior as
+ * 'modprobe -r' or rmmod, it will recursevily go trought the \p module
+ * dependencies and unload modules with a refcount of 0.
+ *
+ * @param mod The module to unload
+ *
+ * @returns \c 0 on success
+ * \c < 0 on error
+ */
static int rmmod_recurse(struct kmod_module *mod) {
int ret = 0;
struct kmod_list *deps, *itr;
return ret;
}
+/**
+ * @brief Unloads the kernel modules in \p modules
+ *
+ * @param modules List of modules to unload
+ * @param entries Number of modules in the list
+ * @param required Are the modules required or optionnal
+ *
+ */
static void modprobe_remove_lttng(const struct kern_modules_param *modules,
int entries, int required)
{
for (i = entries - 1; i >= 0; i--) {
struct kmod_module *mod = NULL;
+ if (!modules[i].loaded) {
+ continue;
+ }
+
ret = kmod_module_new_from_name(ctx, modules[i].name, &mod);
if (ret < 0) {
PERROR("Failed to create kmod module for %s", modules[i].name);
}
} else {
DBG("Modprobe successfully %s", modules[i].name);
+ modules[i].loaded = true;
}
}
char modprobe[256];
for (i = entries - 1; i >= 0; i--) {
+ if (!modules[i].loaded) {
+ continue;
+ }
ret = snprintf(modprobe, sizeof(modprobe),
"/sbin/modprobe -r -q %s",
modules[i].name);
* Base probes: either from command line option, environment
* variable or default list.
*/
- if (kmod_probes_list) {
- list = kmod_probes_list;
- } else {
- list = utils_get_kmod_probes_list();
- }
-
+ list = config.kmod_probes_list.value;
if (list) {
/* User-specified probes. */
ret = append_list_to_probes(list);
/*
* Extra modules? Append them to current probes list.
*/
- if (kmod_extra_probes_list) {
- list = kmod_extra_probes_list;
- } else {
- list = utils_get_extra_kmod_probes_list();
- }
-
+ list = config.kmod_extra_probes_list.value;
if (list) {
ret = append_list_to_probes(list);
if (ret) {