+/*
+ * Copyright (C) 2011 - David Goulet <dgoulet@efficios.com>
+ *
+ * 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; only version 2 of the License.
+ *
+ * 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., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+
+#include <common/common.h>
+
+#include "modprobe.h"
+#include "kern-modules.h"
+
+/* MUST be loaded first */
+const struct kern_modules_param kern_modules_control[] = {
+ { "ltt-relay", 1 },
+};
+
+/* LTTng kernel tracer modules list */
+const struct kern_modules_param kern_modules_list[] = {
+ { "lttng-ftrace", 0 },
+ { "lttng-kprobes", 0 },
+ { "lttng-kretprobes", 0 },
+ { "lib-ring-buffer", 1 },
+ { "ltt-ring-buffer-client-discard", 1 },
+ { "ltt-ring-buffer-client-overwrite", 1 },
+ { "ltt-ring-buffer-metadata-client", 1 },
+ { "ltt-ring-buffer-client-mmap-discard", 1 },
+ { "ltt-ring-buffer-client-mmap-overwrite", 1 },
+ { "ltt-ring-buffer-metadata-mmap-client", 1 },
+ { "lttng-probe-lttng", 1 },
+ { "lttng-types", 0 },
+ { "lttng-probe-block", 0 },
+ { "lttng-probe-irq", 0 },
+ { "lttng-probe-kvm", 0 },
+ { "lttng-probe-sched", 0 },
+};
+
+/*
+ * Remove control kernel module(s) in reverse load order.
+ */
+void modprobe_remove_lttng_control(void)
+{
+ int ret = 0, i;
+ char modprobe[256];
+
+ for (i = ARRAY_SIZE(kern_modules_control) - 1; i >= 0; i--) {
+ ret = snprintf(modprobe, sizeof(modprobe),
+ "/sbin/modprobe -r -q %s",
+ kern_modules_control[i].name);
+ if (ret < 0) {
+ PERROR("snprintf modprobe -r");
+ goto error;
+ }
+ modprobe[sizeof(modprobe) - 1] = '\0';
+ ret = system(modprobe);
+ if (ret == -1) {
+ ERR("Unable to launch modprobe -r for module %s",
+ kern_modules_control[i].name);
+ } else if (kern_modules_control[i].required
+ && WEXITSTATUS(ret) != 0) {
+ ERR("Unable to remove module %s",
+ kern_modules_control[i].name);
+ } else {
+ DBG("Modprobe removal successful %s",
+ kern_modules_control[i].name);
+ }
+ }
+
+error:
+ return;
+}
+
+/*
+ * Remove data kernel modules in reverse load order.
+ */
+void modprobe_remove_lttng_data(void)
+{
+ int ret = 0, i;
+ char modprobe[256];
+
+ for (i = ARRAY_SIZE(kern_modules_list) - 1; i >= 0; i--) {
+ ret = snprintf(modprobe, sizeof(modprobe),
+ "/sbin/modprobe -r -q %s",
+ kern_modules_list[i].name);
+ if (ret < 0) {
+ perror("snprintf modprobe -r");
+ goto error;
+ }
+ modprobe[sizeof(modprobe) - 1] = '\0';
+ ret = system(modprobe);
+ if (ret == -1) {
+ ERR("Unable to launch modprobe -r for module %s",
+ kern_modules_list[i].name);
+ } else if (kern_modules_list[i].required
+ && WEXITSTATUS(ret) != 0) {
+ ERR("Unable to remove module %s",
+ kern_modules_list[i].name);
+ } else {
+ DBG("Modprobe removal successful %s",
+ kern_modules_list[i].name);
+ }
+ }
+
+error:
+ return;
+}
+
+/*
+ * Remove all kernel modules in reverse order.
+ */
+void modprobe_remove_lttng_all(void)
+{
+ modprobe_remove_lttng_data();
+ modprobe_remove_lttng_control();
+}
+
+/*
+ * Load control kernel module(s).
+ */
+int modprobe_lttng_control(void)
+{
+ int ret = 0, i;
+ char modprobe[256];
+
+ for (i = 0; i < ARRAY_SIZE(kern_modules_control); i++) {
+ ret = snprintf(modprobe, sizeof(modprobe),
+ "/sbin/modprobe %s%s",
+ kern_modules_control[i].required ? "" : "-q ",
+ kern_modules_control[i].name);
+ if (ret < 0) {
+ PERROR("snprintf modprobe");
+ goto error;
+ }
+ modprobe[sizeof(modprobe) - 1] = '\0';
+ ret = system(modprobe);
+ if (ret == -1) {
+ ERR("Unable to launch modprobe for module %s",
+ kern_modules_control[i].name);
+ } else if (kern_modules_control[i].required
+ && WEXITSTATUS(ret) != 0) {
+ ERR("Unable to load module %s",
+ kern_modules_control[i].name);
+ } else {
+ DBG("Modprobe successfully %s",
+ kern_modules_control[i].name);
+ }
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Load data kernel module(s).
+ */
+int modprobe_lttng_data(void)
+{
+ int ret = 0, i;
+ char modprobe[256];
+
+ for (i = 0; i < ARRAY_SIZE(kern_modules_list); i++) {
+ ret = snprintf(modprobe, sizeof(modprobe),
+ "/sbin/modprobe %s%s",
+ kern_modules_list[i].required ? "" : "-q ",
+ kern_modules_list[i].name);
+ if (ret < 0) {
+ perror("snprintf modprobe");
+ goto error;
+ }
+ modprobe[sizeof(modprobe) - 1] = '\0';
+ ret = system(modprobe);
+ if (ret == -1) {
+ ERR("Unable to launch modprobe for module %s",
+ kern_modules_list[i].name);
+ } else if (kern_modules_list[i].required
+ && WEXITSTATUS(ret) != 0) {
+ ERR("Unable to load module %s",
+ kern_modules_list[i].name);
+ } else {
+ DBG("Modprobe successfully %s",
+ kern_modules_list[i].name);
+ }
+ }
+
+error:
+ return ret;
+}
+
+/*
+ * Load all lttng kernel modules.
+ */
+int modprobe_lttng_all(void)
+{
+ int ret;
+
+ ret = modprobe_lttng_control();
+ if (ret < 0) {
+ goto error;
+ }
+
+ ret = modprobe_lttng_data();
+ if (ret < 0) {
+ goto error;
+ }
+
+error:
+ return ret;
+}