/*
* Copyright (C) 2011 - David Goulet <dgoulet@efficios.com>
+ * 2014 - Jan Glauber <jan.glauber@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2 only,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
-#define _GNU_SOURCE
+#define _LGPL_SOURCE
+#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <common/common.h>
+#include <common/utils.h>
#include "modprobe.h"
#include "kern-modules.h"
};
/* LTTng kernel tracer probe modules list */
-const struct kern_modules_param kern_modules_probes[] = {
+struct kern_modules_param kern_modules_probes_default[] = {
{ "lttng-probe-asoc" },
{ "lttng-probe-block" },
{ "lttng-probe-btrfs" },
{ "lttng-probe-v4l2" },
{ "lttng-probe-workqueue" },
{ "lttng-probe-writeback" },
+ { "lttng-probe-x86-irq-vectors" },
};
-void modprobe_remove_lttng(const struct kern_modules_param *modules,
- int entries, int required)
+/* dynamic probe modules list */
+static struct kern_modules_param *probes;
+static int nr_probes;
+static int probes_capacity;
+
+static void modprobe_remove_lttng(const struct kern_modules_param *modules,
+ int entries, int required)
{
int ret = 0, i;
char modprobe[256];
void modprobe_remove_lttng_control(void)
{
modprobe_remove_lttng(kern_modules_control_opt,
- ARRAY_SIZE(kern_modules_control_opt),
- LTTNG_MOD_OPTIONAL);
+ ARRAY_SIZE(kern_modules_control_opt),
+ LTTNG_MOD_OPTIONAL);
modprobe_remove_lttng(kern_modules_control_core,
- ARRAY_SIZE(kern_modules_control_core),
- LTTNG_MOD_REQUIRED);
+ ARRAY_SIZE(kern_modules_control_core),
+ LTTNG_MOD_REQUIRED);
+}
+
+static void free_probes(void)
+{
+ int i;
+
+ if (!probes) {
+ return;
+ }
+ for (i = 0; i < nr_probes; ++i) {
+ free(probes[i].name);
+ }
+ free(probes);
+ probes = NULL;
+ nr_probes = 0;
}
/*
*/
void modprobe_remove_lttng_data(void)
{
- return modprobe_remove_lttng(kern_modules_probes,
- ARRAY_SIZE(kern_modules_probes),
- LTTNG_MOD_OPTIONAL);
+ if (!probes) {
+ return;
+ }
+ modprobe_remove_lttng(probes, nr_probes, LTTNG_MOD_OPTIONAL);
+ free_probes();
}
/*
modprobe_remove_lttng_control();
}
-static int modprobe_lttng(const struct kern_modules_param *modules,
- int entries, int required)
+#if HAVE_KMOD
+#include <libkmod.h>
+static void log_kmod(void *data, int priority, const char *file, int line,
+ const char *fn, const char *format, va_list args)
+{
+ char *str;
+
+ if (vasprintf(&str, format, args) < 0) {
+ return;
+ }
+
+ DBG("libkmod: %s", str);
+ free(str);
+}
+static int modprobe_lttng(struct kern_modules_param *modules,
+ int entries, int required)
+{
+ int ret = 0, i;
+ struct kmod_ctx *ctx;
+
+ ctx = kmod_new(NULL, NULL);
+ if (!ctx) {
+ PERROR("Unable to create kmod library context");
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ kmod_set_log_fn(ctx, log_kmod, NULL);
+ kmod_load_resources(ctx);
+
+ for (i = 0; i < entries; i++) {
+ struct kmod_module *mod = NULL;
+
+ 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);
+ goto error;
+ }
+
+ ret = kmod_module_probe_insert_module(mod, KMOD_PROBE_IGNORE_LOADED,
+ NULL, NULL, NULL, NULL);
+ if (ret < 0) {
+ if (required) {
+ ERR("Unable to load required module %s",
+ modules[i].name);
+ goto error;
+ } else {
+ DBG("Unable to load optional module %s; continuing",
+ modules[i].name);
+ ret = 0;
+ }
+ } else {
+ DBG("Modprobe successfully %s", modules[i].name);
+ }
+
+ kmod_module_unref(mod);
+ }
+
+error:
+ if (ctx) {
+ kmod_unref(ctx);
+ }
+ return ret;
+}
+
+#else /* HAVE_KMOD */
+
+static int modprobe_lttng(struct kern_modules_param *modules,
+ int entries, int required)
{
int ret = 0, i;
char modprobe[256];
modprobe[sizeof(modprobe) - 1] = '\0';
ret = system(modprobe);
if (ret == -1) {
- ERR("Unable to launch modprobe for module %s",
- modules[i].name);
- } else if (required && WEXITSTATUS(ret) != 0) {
- ERR("Unable to load module %s", modules[i].name);
+ if (required) {
+ ERR("Unable to launch modprobe for required module %s",
+ modules[i].name);
+ goto error;
+ } else {
+ DBG("Unable to launch modprobe for optional module %s; continuing",
+ modules[i].name);
+ ret = 0;
+ }
+ } else if (WEXITSTATUS(ret) != 0) {
+ if (required) {
+ ERR("Unable to load required module %s",
+ modules[i].name);
+ goto error;
+ } else {
+ DBG("Unable to load optional module %s; continuing",
+ modules[i].name);
+ ret = 0;
+ }
} else {
DBG("Modprobe successfully %s", modules[i].name);
}
return ret;
}
+#endif /* HAVE_KMOD */
+
/*
* Load control kernel module(s).
*/
if (ret != 0)
return ret;
ret = modprobe_lttng(kern_modules_control_opt,
- ARRAY_SIZE(kern_modules_control_opt),
- LTTNG_MOD_OPTIONAL);
+ ARRAY_SIZE(kern_modules_control_opt),
+ LTTNG_MOD_OPTIONAL);
+ return ret;
+}
+
+/**
+ * Grow global list of probes (double capacity or set it to 1 if
+ * currently 0 and copy existing data).
+ */
+static int grow_probes(void)
+{
+ int i;
+ struct kern_modules_param *tmp_probes;
+
+ /* Initialize capacity to 1 if 0. */
+ if (probes_capacity == 0) {
+ probes = zmalloc(sizeof(*probes));
+ if (!probes) {
+ PERROR("malloc probe list");
+ return -ENOMEM;
+ }
+
+ probes_capacity = 1;
+ return 0;
+ }
+
+ /* Double size. */
+ probes_capacity *= 2;
+
+ tmp_probes = zmalloc(sizeof(*tmp_probes) * probes_capacity);
+ if (!tmp_probes) {
+ PERROR("malloc probe list");
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < nr_probes; ++i) {
+ /* Move name pointer. */
+ tmp_probes[i].name = probes[i].name;
+ }
+
+ /* Replace probes with larger copy. */
+ free(probes);
+ probes = tmp_probes;
+
+ return 0;
+}
+
+/*
+ * Appends a comma-separated list of probes to the global list
+ * of probes.
+ */
+static int append_list_to_probes(const char *list)
+{
+ char *next;
+ int ret;
+ char *tmp_list, *cur_list;
+
+ assert(list);
+
+ cur_list = tmp_list = strdup(list);
+ if (!tmp_list) {
+ PERROR("strdup temp list");
+ return -ENOMEM;
+ }
+
+ for (;;) {
+ size_t name_len;
+ struct kern_modules_param *cur_mod;
+
+ next = strtok(cur_list, ",");
+ if (!next) {
+ break;
+ }
+ cur_list = NULL;
+
+ /* filter leading spaces */
+ while (*next == ' ') {
+ next++;
+ }
+
+ if (probes_capacity <= nr_probes) {
+ ret = grow_probes();
+ if (ret) {
+ goto error;
+ }
+ }
+
+ /* Length 13 is "lttng-probe-" + \0 */
+ name_len = strlen(next) + 13;
+
+ cur_mod = &probes[nr_probes];
+ cur_mod->name = zmalloc(name_len);
+ if (!cur_mod->name) {
+ PERROR("malloc probe list");
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ ret = snprintf(cur_mod->name, name_len, "lttng-probe-%s", next);
+ if (ret < 0) {
+ PERROR("snprintf modprobe name");
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ nr_probes++;
+ }
+
+ free(tmp_list);
+ return 0;
+
+error:
+ free(tmp_list);
+ free_probes();
return ret;
}
*/
int modprobe_lttng_data(void)
{
- return modprobe_lttng(kern_modules_probes,
- ARRAY_SIZE(kern_modules_probes),
- LTTNG_MOD_OPTIONAL);
+ int ret, i;
+ char *list;
+
+ /*
+ * 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();
+ }
+
+ if (list) {
+ /* User-specified probes. */
+ ret = append_list_to_probes(list);
+ if (ret) {
+ return ret;
+ }
+ } else {
+ /* Default probes. */
+ int def_len = ARRAY_SIZE(kern_modules_probes_default);
+
+ probes = zmalloc(sizeof(*probes) * def_len);
+ if (!probes) {
+ PERROR("malloc probe list");
+ return -ENOMEM;
+ }
+
+ nr_probes = probes_capacity = def_len;
+
+ for (i = 0; i < def_len; ++i) {
+ char* name = strdup(kern_modules_probes_default[i].name);
+
+ if (!name) {
+ PERROR("strdup probe item");
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ probes[i].name = name;
+ }
+ }
+
+ /*
+ * 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();
+ }
+
+ if (list) {
+ ret = append_list_to_probes(list);
+ if (ret) {
+ goto error;
+ }
+ }
+
+ /*
+ * Load probes modules now.
+ */
+ ret = modprobe_lttng(probes, nr_probes, LTTNG_MOD_OPTIONAL);
+ if (ret) {
+ goto error;
+ }
+ return ret;
+
+error:
+ free_probes();
+ return ret;
}