/*
* 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,
#include <sys/wait.h>
#include <common/common.h>
+#include <common/utils.h>
#include "modprobe.h"
#include "kern-modules.h"
-/* MUST be loaded first */
-const struct kern_modules_param kern_modules_control[] = {
- { "lttng-tracer", 1 },
+#define LTTNG_MOD_REQUIRED 1
+#define LTTNG_MOD_OPTIONAL 0
+
+/* LTTng kernel tracer mandatory core modules list */
+struct kern_modules_param kern_modules_control_core[] = {
+ { "lttng-tracer" }, /* MUST be loaded first so keep at top */
+ { "lttng-lib-ring-buffer" },
+ { "lttng-ring-buffer-client-discard" },
+ { "lttng-ring-buffer-client-overwrite" },
+ { "lttng-ring-buffer-metadata-client" },
+ { "lttng-ring-buffer-client-mmap-discard" },
+ { "lttng-ring-buffer-client-mmap-overwrite" },
+ { "lttng-ring-buffer-metadata-mmap-client" },
};
-/* LTTng kernel tracer modules list */
-const struct kern_modules_param kern_modules_list[] = {
- { "lttng-ftrace", 0 },
- { "lttng-kprobes", 0 },
- { "lttng-kretprobes", 0 },
- { "lttng-lib-ring-buffer", 1 },
- { "lttng-ring-buffer-client-discard", 1 },
- { "lttng-ring-buffer-client-overwrite", 1 },
- { "lttng-ring-buffer-metadata-client", 1 },
- { "lttng-ring-buffer-client-mmap-discard", 1 },
- { "lttng-ring-buffer-client-mmap-overwrite", 1 },
- { "lttng-ring-buffer-metadata-mmap-client", 1 },
- { "lttng-types", 0 },
- { "lttng-probe-asoc", 0 },
- { "lttng-probe-block", 0 },
- { "lttng-probe-btrfs", 0 },
- { "lttng-probe-compaction", 0 },
- { "lttng-probe-ext3", 0 },
- { "lttng-probe-ext4", 0 },
- { "lttng-probe-gpio", 0 },
- { "lttng-probe-irq", 0 },
- { "lttng-probe-jbd", 0 },
- { "lttng-probe-jbd2", 0 },
- { "lttng-probe-kmem", 0 },
- { "lttng-probe-kvm", 0 },
- { "lttng-probe-kvm-x86", 0 },
- { "lttng-probe-kvm-x86-mmu", 0 },
- { "lttng-probe-lock", 0 },
- { "lttng-probe-module", 0 },
- { "lttng-probe-napi", 0 },
- { "lttng-probe-net", 0 },
- { "lttng-probe-power", 0 },
- { "lttng-probe-printk", 0 },
- { "lttng-probe-random", 0 },
- { "lttng-probe-rcu", 0 },
- { "lttng-probe-regmap", 0 },
- { "lttng-probe-regulator", 0 },
- { "lttng-probe-rpm", 0 },
- { "lttng-probe-sched", 0 },
- { "lttng-probe-scsi", 0 },
- { "lttng-probe-signal", 0 },
- { "lttng-probe-skb", 0 },
- { "lttng-probe-sock", 0 },
- { "lttng-probe-statedump", 0 },
- { "lttng-probe-sunrpc", 0 },
- { "lttng-probe-timer", 0 },
- { "lttng-probe-udp", 0 },
- { "lttng-probe-vmscan", 0 },
- { "lttng-probe-v4l2", 0 },
- { "lttng-probe-workqueue", 0 },
- { "lttng-probe-writeback", 0 },
+/* LTTng kernel tracer optional base modules list */
+struct kern_modules_param kern_modules_control_opt[] = {
+ { "lttng-types" },
+ { "lttng-ftrace" },
+ { "lttng-kprobes" },
+ { "lttng-kretprobes" },
};
-/*
- * Remove control kernel module(s) in reverse load order.
- */
-void modprobe_remove_lttng_control(void)
+/* LTTng kernel tracer probe modules list */
+struct kern_modules_param kern_modules_probes_default[] = {
+ { "lttng-probe-asoc" },
+ { "lttng-probe-block" },
+ { "lttng-probe-btrfs" },
+ { "lttng-probe-compaction" },
+ { "lttng-probe-ext3" },
+ { "lttng-probe-ext4" },
+ { "lttng-probe-gpio" },
+ { "lttng-probe-irq" },
+ { "lttng-probe-jbd" },
+ { "lttng-probe-jbd2" },
+ { "lttng-probe-kmem" },
+ { "lttng-probe-kvm" },
+ { "lttng-probe-kvm-x86" },
+ { "lttng-probe-kvm-x86-mmu" },
+ { "lttng-probe-lock" },
+ { "lttng-probe-module" },
+ { "lttng-probe-napi" },
+ { "lttng-probe-net" },
+ { "lttng-probe-power" },
+ { "lttng-probe-printk" },
+ { "lttng-probe-random" },
+ { "lttng-probe-rcu" },
+ { "lttng-probe-regmap" },
+ { "lttng-probe-regulator" },
+ { "lttng-probe-rpm" },
+ { "lttng-probe-sched" },
+ { "lttng-probe-scsi" },
+ { "lttng-probe-signal" },
+ { "lttng-probe-skb" },
+ { "lttng-probe-sock" },
+ { "lttng-probe-statedump" },
+ { "lttng-probe-sunrpc" },
+ { "lttng-probe-timer" },
+ { "lttng-probe-udp" },
+ { "lttng-probe-vmscan" },
+ { "lttng-probe-v4l2" },
+ { "lttng-probe-workqueue" },
+ { "lttng-probe-writeback" },
+};
+
+/* dynamic probe modules list */
+static struct kern_modules_param *probes;
+static int nr_probes;
+
+void modprobe_remove_lttng(const struct kern_modules_param *modules,
+ int entries, int required)
{
int ret = 0, i;
char modprobe[256];
- for (i = ARRAY_SIZE(kern_modules_control) - 1; i >= 0; i--) {
+ for (i = entries - 1; i >= 0; i--) {
ret = snprintf(modprobe, sizeof(modprobe),
"/sbin/modprobe -r -q %s",
- kern_modules_control[i].name);
+ modules[i].name);
if (ret < 0) {
PERROR("snprintf modprobe -r");
- goto error;
+ return;
}
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) {
+ modules[i].name);
+ } else if (required && WEXITSTATUS(ret) != 0) {
ERR("Unable to remove module %s",
- kern_modules_control[i].name);
+ modules[i].name);
} else {
DBG("Modprobe removal successful %s",
- kern_modules_control[i].name);
+ modules[i].name);
}
+ if (probes)
+ free(probes[i].name);
}
+}
-error:
- return;
+/*
+ * Remove control kernel module(s) in reverse load order.
+ */
+void modprobe_remove_lttng_control(void)
+{
+ modprobe_remove_lttng(kern_modules_control_opt,
+ 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);
}
/*
*/
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;
+ if (probes) {
+ modprobe_remove_lttng(probes, nr_probes, LTTNG_MOD_OPTIONAL);
+ free(probes);
+ probes = NULL;
+ } else
+ modprobe_remove_lttng(kern_modules_probes_default,
+ ARRAY_SIZE(kern_modules_probes_default),
+ LTTNG_MOD_OPTIONAL);
}
/*
modprobe_remove_lttng_control();
}
-/*
- * Load control kernel module(s).
- */
-int modprobe_lttng_control(void)
+static int modprobe_lttng(struct kern_modules_param *modules,
+ int entries, int required)
{
int ret = 0, i;
char modprobe[256];
- for (i = 0; i < ARRAY_SIZE(kern_modules_control); i++) {
+ for (i = 0; i < entries; i++) {
ret = snprintf(modprobe, sizeof(modprobe),
"/sbin/modprobe %s%s",
- kern_modules_control[i].required ? "" : "-q ",
- kern_modules_control[i].name);
+ required ? "" : "-q ",
+ modules[i].name);
if (ret < 0) {
PERROR("snprintf modprobe");
goto error;
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);
+ modules[i].name);
+ } else if (required && WEXITSTATUS(ret) != 0) {
+ ERR("Unable to load module %s", modules[i].name);
} else {
- DBG("Modprobe successfully %s",
- kern_modules_control[i].name);
+ DBG("Modprobe successfully %s", modules[i].name);
}
}
return ret;
}
+/*
+ * Load control kernel module(s).
+ */
+int modprobe_lttng_control(void)
+{
+ int ret;
+
+ ret = modprobe_lttng(kern_modules_control_core,
+ ARRAY_SIZE(kern_modules_control_core),
+ LTTNG_MOD_REQUIRED);
+ if (ret != 0)
+ return ret;
+ ret = modprobe_lttng(kern_modules_control_opt,
+ ARRAY_SIZE(kern_modules_control_opt),
+ LTTNG_MOD_OPTIONAL);
+ return ret;
+}
+
/*
* Load data kernel module(s).
*/
int modprobe_lttng_data(void)
{
- int ret = 0, i;
- char modprobe[256];
+ int i, ret;
+ int entries = ARRAY_SIZE(kern_modules_probes_default);
+ char *list, *next;
- 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;
+ /*
+ * First take command line option, if not available take environment
+ * variable.
+ */
+ if (kmod_probes_list) {
+ list = kmod_probes_list;
+ } else {
+ list = utils_get_kmod_probes_list();
+ }
+ /* The default is to load ALL probes */
+ if (!list) {
+ return modprobe_lttng(kern_modules_probes_default, entries,
+ LTTNG_MOD_OPTIONAL);
+ }
+
+ /*
+ * A probe list is available, so use it.
+ * The number of probes is limited by the number of probes in the
+ * default list.
+ */
+ probes = zmalloc(sizeof(struct kern_modules_param *) * entries);
+ if (!probes) {
+ PERROR("malloc probe list");
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < entries; i++) {
+ size_t name_len;
+
+ next = strtok(list, ",");
+ if (!next) {
+ goto out;
}
- 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);
+ list = NULL;
+
+ /* filter leading spaces */
+ while (*next == ' ') {
+ next++;
+ }
+
+ /* Length 13 is "lttng-probe-" + \0 */
+ name_len = strlen(next) + 13;
+
+ probes[i].name = zmalloc(name_len);
+ if (!probes[i].name) {
+ PERROR("malloc probe list");
+ return -ENOMEM;
+ }
+
+ ret = snprintf(probes[i].name, name_len, "lttng-probe-%s", next);
+ if (ret < 0) {
+ PERROR("snprintf modprobe name");
+ goto out;
}
}
-error:
- return ret;
+out:
+ nr_probes = i;
+ return modprobe_lttng(probes, nr_probes, LTTNG_MOD_OPTIONAL);
}
projects / lttng-tools.git / blobdiff