X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=libust%2Fmarker-control.c;fp=libust%2Fmarker-control.c;h=29c43b09816e9ccf196b883335756b0999e90faf;hb=b4512257eb71d0432554047acf6278dc42a15a75;hp=0000000000000000000000000000000000000000;hpb=e70acc91ae21023149204a245638c1d2dffa7265;p=ust.git diff --git a/libust/marker-control.c b/libust/marker-control.c new file mode 100644 index 0000000..29c43b0 --- /dev/null +++ b/libust/marker-control.c @@ -0,0 +1,459 @@ +/* + * Copyright (C) 2007 Mathieu Desnoyers + * + * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * LTT marker control module over /proc + */ + +//ust// #include +//ust// #include +//ust// #include +//ust// #include +//ust// #include +//ust// #include +//ust// #include +//ust// #include +//ust// #include +//ust// #include +//ust// #include +//ust// #include +//ust// #include +#include "kernelcompat.h" +#include "list.h" +#include "tracer.h" +#include "localerr.h" + +#define DEFAULT_CHANNEL "cpu" +#define DEFAULT_PROBE "default" + +LIST_HEAD(probes_list); + +/* + * Mutex protecting the probe slab cache. + * Nests inside the traces mutex. + */ +DEFINE_MUTEX(probes_mutex); + +struct ltt_available_probe default_probe = { + .name = "default", + .format = NULL, + .probe_func = ltt_vtrace, + .callbacks[0] = ltt_serialize_data, +}; + +//ust//static struct kmem_cache *markers_loaded_cachep; +static LIST_HEAD(markers_loaded_list); +/* + * List sorted by name strcmp order. + */ +static LIST_HEAD(probes_registered_list); + +//ust// static struct proc_dir_entry *pentry; + +//ust// static struct file_operations ltt_fops; + +static struct ltt_available_probe *get_probe_from_name(const char *pname) +{ + struct ltt_available_probe *iter; + int comparison, found = 0; + + if (!pname) + pname = DEFAULT_PROBE; + list_for_each_entry(iter, &probes_registered_list, node) { + comparison = strcmp(pname, iter->name); + if (!comparison) + found = 1; + if (comparison <= 0) + break; + } + if (found) + return iter; + else + return NULL; +} + +static char *skip_spaces(char *buf) +{ + while (*buf != '\0' && isspace(*buf)) + buf++; + return buf; +} + +static char *skip_nonspaces(char *buf) +{ + while (*buf != '\0' && !isspace(*buf)) + buf++; + return buf; +} + +static void get_marker_string(char *buf, char **start, + char **end) +{ + *start = skip_spaces(buf); + *end = skip_nonspaces(*start); + **end = '\0'; +} + +int ltt_probe_register(struct ltt_available_probe *pdata) +{ + int ret = 0; + int comparison; + struct ltt_available_probe *iter; + + mutex_lock(&probes_mutex); + list_for_each_entry_reverse(iter, &probes_registered_list, node) { + comparison = strcmp(pdata->name, iter->name); + if (!comparison) { + ret = -EBUSY; + goto end; + } else if (comparison > 0) { + /* We belong to the location right after iter. */ + list_add(&pdata->node, &iter->node); + goto end; + } + } + /* Should be added at the head of the list */ + list_add(&pdata->node, &probes_registered_list); +end: + mutex_unlock(&probes_mutex); + return ret; +} +EXPORT_SYMBOL_GPL(ltt_probe_register); + +/* + * Called when a probe does not want to be called anymore. + */ +int ltt_probe_unregister(struct ltt_available_probe *pdata) +{ + int ret = 0; + struct ltt_active_marker *amark, *tmp; + + mutex_lock(&probes_mutex); + list_for_each_entry_safe(amark, tmp, &markers_loaded_list, node) { + if (amark->probe == pdata) { + ret = marker_probe_unregister_private_data( + pdata->probe_func, amark); + if (ret) + goto end; + list_del(&amark->node); + free(amark); + } + } + list_del(&pdata->node); +end: + mutex_unlock(&probes_mutex); + return ret; +} +EXPORT_SYMBOL_GPL(ltt_probe_unregister); + +/* + * Connect marker "mname" to probe "pname". + * Only allow _only_ probe instance to be connected to a marker. + */ +int ltt_marker_connect(const char *channel, const char *mname, + const char *pname) + +{ + int ret; + struct ltt_active_marker *pdata; + struct ltt_available_probe *probe; + + ltt_lock_traces(); + mutex_lock(&probes_mutex); + probe = get_probe_from_name(pname); + if (!probe) { + ret = -ENOENT; + goto end; + } + pdata = marker_get_private_data(channel, mname, probe->probe_func, 0); + if (pdata && !IS_ERR(pdata)) { + ret = -EEXIST; + goto end; + } + pdata = zmalloc(sizeof(struct ltt_active_marker)); + if (!pdata) { + ret = -ENOMEM; + goto end; + } + pdata->probe = probe; + /* + * ID has priority over channel in case of conflict. + */ + ret = marker_probe_register(channel, mname, NULL, + probe->probe_func, pdata); + if (ret) + free(pdata); + else + list_add(&pdata->node, &markers_loaded_list); +end: + mutex_unlock(&probes_mutex); + ltt_unlock_traces(); + return ret; +} +EXPORT_SYMBOL_GPL(ltt_marker_connect); + +/* + * Disconnect marker "mname", probe "pname". + */ +int ltt_marker_disconnect(const char *channel, const char *mname, + const char *pname) +{ + struct ltt_active_marker *pdata; + struct ltt_available_probe *probe; + int ret = 0; + + mutex_lock(&probes_mutex); + probe = get_probe_from_name(pname); + if (!probe) { + ret = -ENOENT; + goto end; + } + pdata = marker_get_private_data(channel, mname, probe->probe_func, 0); + if (IS_ERR(pdata)) { + ret = PTR_ERR(pdata); + goto end; + } else if (!pdata) { + /* + * Not registered by us. + */ + ret = -EPERM; + goto end; + } + ret = marker_probe_unregister(channel, mname, probe->probe_func, pdata); + if (ret) + goto end; + else { + list_del(&pdata->node); + free(pdata); + } +end: + mutex_unlock(&probes_mutex); + return ret; +} +EXPORT_SYMBOL_GPL(ltt_marker_disconnect); + +/* + * function handling proc entry write. + * + * connect []] + * disconnect [] + */ +//ust// static ssize_t ltt_write(struct file *file, const char __user *buffer, +//ust// size_t count, loff_t *offset) +//ust// { +//ust// char *kbuf; +//ust// char *iter, *marker_action, *arg[4]; +//ust// ssize_t ret; +//ust// int i; +//ust// +//ust// if (!count) +//ust// return -EINVAL; +//ust// +//ust// kbuf = vmalloc(count + 1); +//ust// kbuf[count] = '\0'; /* Transform into a string */ +//ust// ret = copy_from_user(kbuf, buffer, count); +//ust// if (ret) { +//ust// ret = -EINVAL; +//ust// goto end; +//ust// } +//ust// get_marker_string(kbuf, &marker_action, &iter); +//ust// if (!marker_action || marker_action == iter) { +//ust// ret = -EINVAL; +//ust// goto end; +//ust// } +//ust// for (i = 0; i < 4; i++) { +//ust// arg[i] = NULL; +//ust// if (iter < kbuf + count) { +//ust// iter++; /* skip the added '\0' */ +//ust// get_marker_string(iter, &arg[i], &iter); +//ust// if (arg[i] == iter) +//ust// arg[i] = NULL; +//ust// } +//ust// } +//ust// +//ust// if (!arg[0] || !arg[1]) { +//ust// ret = -EINVAL; +//ust// goto end; +//ust// } +//ust// +//ust// if (!strcmp(marker_action, "connect")) { +//ust// ret = ltt_marker_connect(arg[0], arg[1], arg[2]); +//ust// if (ret) +//ust// goto end; +//ust// } else if (!strcmp(marker_action, "disconnect")) { +//ust// ret = ltt_marker_disconnect(arg[0], arg[1], arg[2]); +//ust// if (ret) +//ust// goto end; +//ust// } +//ust// ret = count; +//ust// end: +//ust// vfree(kbuf); +//ust// return ret; +//ust// } +//ust// +//ust// static void *s_next(struct seq_file *m, void *p, loff_t *pos) +//ust// { +//ust// struct marker_iter *iter = m->private; +//ust// +//ust// marker_iter_next(iter); +//ust// if (!iter->marker) { +//ust// /* +//ust// * Setting the iter module to -1UL will make sure +//ust// * that no module can possibly hold the current marker. +//ust// */ +//ust// iter->module = (void *)-1UL; +//ust// return NULL; +//ust// } +//ust// return iter->marker; +//ust// } +//ust// +//ust// static void *s_start(struct seq_file *m, loff_t *pos) +//ust// { +//ust// struct marker_iter *iter = m->private; +//ust// +//ust// if (!*pos) +//ust// marker_iter_reset(iter); +//ust// marker_iter_start(iter); +//ust// if (!iter->marker) { +//ust// /* +//ust// * Setting the iter module to -1UL will make sure +//ust// * that no module can possibly hold the current marker. +//ust// */ +//ust// iter->module = (void *)-1UL; +//ust// return NULL; +//ust// } +//ust// return iter->marker; +//ust// } +//ust// +//ust// static void s_stop(struct seq_file *m, void *p) +//ust// { +//ust// marker_iter_stop(m->private); +//ust// } +//ust// +//ust// static int s_show(struct seq_file *m, void *p) +//ust// { +//ust// struct marker_iter *iter = m->private; +//ust// +//ust// seq_printf(m, "channel: %s marker: %s format: \"%s\" state: %d " +//ust// "event_id: %hu call: 0x%p probe %s : 0x%p\n", +//ust// iter->marker->channel, +//ust// iter->marker->name, iter->marker->format, +//ust// _imv_read(iter->marker->state), +//ust// iter->marker->event_id, +//ust// iter->marker->call, +//ust// iter->marker->ptype ? "multi" : "single", +//ust// iter->marker->ptype ? +//ust// (void*)iter->marker->multi : (void*)iter->marker->single.func); +//ust// return 0; +//ust// } +//ust// +//ust// static const struct seq_operations ltt_seq_op = { +//ust// .start = s_start, +//ust// .next = s_next, +//ust// .stop = s_stop, +//ust// .show = s_show, +//ust// }; +//ust// +//ust// static int ltt_open(struct inode *inode, struct file *file) +//ust// { +//ust// /* +//ust// * Iterator kept in m->private. +//ust// * Restart iteration on all modules between reads because we do not lock +//ust// * the module mutex between those. +//ust// */ +//ust// int ret; +//ust// struct marker_iter *iter; +//ust// +//ust// iter = kzalloc(sizeof(*iter), GFP_KERNEL); +//ust// if (!iter) +//ust// return -ENOMEM; +//ust// +//ust// ret = seq_open(file, <t_seq_op); +//ust// if (ret == 0) +//ust// ((struct seq_file *)file->private_data)->private = iter; +//ust// else +//ust// kfree(iter); +//ust// return ret; +//ust// } +//ust// +//ust// static struct file_operations ltt_fops = { +//ust// .write = ltt_write, +//ust// .open = ltt_open, +//ust// .read = seq_read, +//ust// .llseek = seq_lseek, +//ust// .release = seq_release_private, +//ust// }; + +static void disconnect_all_markers(void) +{ + struct ltt_active_marker *pdata, *tmp; + + list_for_each_entry_safe(pdata, tmp, &markers_loaded_list, node) { + marker_probe_unregister_private_data(pdata->probe->probe_func, + pdata); + list_del(&pdata->node); + free(pdata); + } +} + +static char initialized = 0; + +void __attribute__((constructor)) init_marker_control(void) +{ + if(!initialized) { + int ret; + +//ust// pentry = create_proc_entry("ltt", S_IRUSR|S_IWUSR, NULL); +//ust// if (!pentry) +//ust// return -EBUSY; +//ust// markers_loaded_cachep = KMEM_CACHE(ltt_active_marker, 0); + + ret = ltt_probe_register(&default_probe); + BUG_ON(ret); + ret = ltt_marker_connect("metadata", "core_marker_format", + DEFAULT_PROBE); + BUG_ON(ret); + ret = ltt_marker_connect("metadata", "core_marker_id", DEFAULT_PROBE); + BUG_ON(ret); +//ust// pentry->proc_fops = <t_fops; + + initialized = 1; + } +} +//ust// module_init(marker_control_init); + +static void __exit marker_control_exit(void) +{ + int ret; + +//ust// remove_proc_entry("ltt", NULL); + ret = ltt_marker_disconnect("metadata", "core_marker_format", + DEFAULT_PROBE); + BUG_ON(ret); + ret = ltt_marker_disconnect("metadata", "core_marker_id", + DEFAULT_PROBE); + BUG_ON(ret); + ret = ltt_probe_unregister(&default_probe); + BUG_ON(ret); + disconnect_all_markers(); +//ust// kmem_cache_destroy(markers_loaded_cachep); +//ust// marker_synchronize_unregister(); +} +//ust// module_exit(marker_control_exit); + +//ust// MODULE_LICENSE("GPL"); +//ust// MODULE_AUTHOR("Mathieu Desnoyers"); +//ust// MODULE_DESCRIPTION("Linux Trace Toolkit Marker Control");