[ust.git] / libust / marker-control.c

/*
 * Copyright (C) 2007 Mathieu Desnoyers
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
 *
 * LTT marker control module over /proc
 */

#include <ctype.h>
#include <stdlib.h>

#include "tracer.h"
#include "usterr.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;
}

/* (unused)
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;

	pthread_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:
	pthread_mutex_unlock(&probes_mutex);
	return ret;
}

/*
 * 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;

	pthread_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:
	pthread_mutex_unlock(&probes_mutex);
	return ret;
}

/*
 * 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();
	pthread_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:
	pthread_mutex_unlock(&probes_mutex);
	ltt_unlock_traces();
	return ret;
}

/*
 * 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;

	pthread_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:
	pthread_mutex_unlock(&probes_mutex);
	return ret;
}

/*
 * function handling proc entry write.
 *
 * connect <channel name> <marker name> [<probe name>]]
 * disconnect <channel name> <marker name> [<probe name>]
 */
//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, &ltt_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 = &ltt_fops;

		initialized = 1;
	}
}
//ust// module_init(marker_control_init);

static void __attribute__((destructor)) 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");
Commit	Line	Data
ba6459ba PMF	1	/*
	2	* Copyright (C) 2007 Mathieu Desnoyers
	3	*
34e4b7db PMF	4	* This library is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU Lesser General Public
	6	* License as published by the Free Software Foundation; either
	7	* version 2.1 of the License, or (at your option) any later version.
ba6459ba	8	*
34e4b7db	9	* This library is distributed in the hope that it will be useful,
ba6459ba	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
34e4b7db PMF	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
34e4b7db PMF	12	* Lesser General Public License for more details.
ba6459ba	13	*
34e4b7db PMF	14	* You should have received a copy of the GNU Lesser General Public
	15	* License along with this library; if not, write to the Free Software
	16	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
ba6459ba PMF	17	*
	18	* LTT marker control module over /proc
	19	*/
	20
772030fe	21	#include <ctype.h>
909bc43f	22	#include <stdlib.h>
772030fe	23
c93858f1	24	#include "tracer.h"
6af64c43	25	#include "usterr.h"
ba6459ba PMF	26
	27	#define DEFAULT_CHANNEL "cpu"
	28	#define DEFAULT_PROBE "default"
	29
	30	LIST_HEAD(probes_list);
	31
	32	/*
	33	* Mutex protecting the probe slab cache.
	34	* Nests inside the traces mutex.
	35	*/
	36	DEFINE_MUTEX(probes_mutex);
	37
	38	struct ltt_available_probe default_probe = {
	39	.name = "default",
	40	.format = NULL,
	41	.probe_func = ltt_vtrace,
	42	.callbacks[0] = ltt_serialize_data,
	43	};
	44
	45	//ust//static struct kmem_cache *markers_loaded_cachep;
	46	static LIST_HEAD(markers_loaded_list);
	47	/*
	48	* List sorted by name strcmp order.
	49	*/
	50	static LIST_HEAD(probes_registered_list);
	51
	52	//ust// static struct proc_dir_entry *pentry;
	53
	54	//ust// static struct file_operations ltt_fops;
	55
	56	static struct ltt_available_probe get_probe_from_name(const char pname)
	57	{
	58	struct ltt_available_probe *iter;
	59	int comparison, found = 0;
	60
	61	if (!pname)
	62	pname = DEFAULT_PROBE;
	63	list_for_each_entry(iter, &probes_registered_list, node) {
	64	comparison = strcmp(pname, iter->name);
	65	if (!comparison)
	66	found = 1;
	67	if (comparison <= 0)
	68	break;
	69	}
	70	if (found)
	71	return iter;
	72	else
	73	return NULL;
	74	}
	75
772030fe	76	/* (unused)
ba6459ba PMF	77	static char skip_spaces(char buf)
	78	{
	79	while (buf != '\0' && isspace(buf))
	80	buf++;
	81	return buf;
	82	}
	83
	84	static char skip_nonspaces(char buf)
	85	{
	86	while (buf != '\0' && !isspace(buf))
	87	buf++;
	88	return buf;
	89	}
	90
	91	static void get_marker_string(char buf, char *start,
	92	char **end)
	93	{
	94	*start = skip_spaces(buf);
	95	end = skip_nonspaces(start);
	96	**end = '\0';
	97	}
772030fe	98	*/
ba6459ba PMF	99
	100	int ltt_probe_register(struct ltt_available_probe *pdata)
	101	{
	102	int ret = 0;
	103	int comparison;
	104	struct ltt_available_probe *iter;
	105
f7b16408	106	pthread_mutex_lock(&probes_mutex);
ba6459ba PMF	107	list_for_each_entry_reverse(iter, &probes_registered_list, node) {
	108	comparison = strcmp(pdata->name, iter->name);
	109	if (!comparison) {
	110	ret = -EBUSY;
	111	goto end;
	112	} else if (comparison > 0) {
	113	/* We belong to the location right after iter. */
	114	list_add(&pdata->node, &iter->node);
	115	goto end;
	116	}
	117	}
	118	/* Should be added at the head of the list */
	119	list_add(&pdata->node, &probes_registered_list);
	120	end:
f7b16408	121	pthread_mutex_unlock(&probes_mutex);
ba6459ba PMF	122	return ret;
ba6459ba PMF	123	}
ba6459ba PMF	124
	125	/*
	126	* Called when a probe does not want to be called anymore.
	127	*/
	128	int ltt_probe_unregister(struct ltt_available_probe *pdata)
	129	{
	130	int ret = 0;
	131	struct ltt_active_marker amark, tmp;
	132
f7b16408	133	pthread_mutex_lock(&probes_mutex);
ba6459ba PMF	134	list_for_each_entry_safe(amark, tmp, &markers_loaded_list, node) {
	135	if (amark->probe == pdata) {
	136	ret = marker_probe_unregister_private_data(
	137	pdata->probe_func, amark);
	138	if (ret)
	139	goto end;
	140	list_del(&amark->node);
	141	free(amark);
	142	}
	143	}
	144	list_del(&pdata->node);
	145	end:
f7b16408	146	pthread_mutex_unlock(&probes_mutex);
ba6459ba PMF	147	return ret;
ba6459ba PMF	148	}
ba6459ba PMF	149
	150	/*
	151	* Connect marker "mname" to probe "pname".
	152	* Only allow _only_ probe instance to be connected to a marker.
	153	*/
	154	int ltt_marker_connect(const char channel, const char mname,
	155	const char *pname)
	156
	157	{
	158	int ret;
	159	struct ltt_active_marker *pdata;
	160	struct ltt_available_probe *probe;
	161
	162	ltt_lock_traces();
f7b16408	163	pthread_mutex_lock(&probes_mutex);
ba6459ba PMF	164	probe = get_probe_from_name(pname);
	165	if (!probe) {
	166	ret = -ENOENT;
	167	goto end;
	168	}
	169	pdata = marker_get_private_data(channel, mname, probe->probe_func, 0);
	170	if (pdata && !IS_ERR(pdata)) {
	171	ret = -EEXIST;
	172	goto end;
	173	}
	174	pdata = zmalloc(sizeof(struct ltt_active_marker));
	175	if (!pdata) {
	176	ret = -ENOMEM;
	177	goto end;
	178	}
	179	pdata->probe = probe;
	180	/*
	181	* ID has priority over channel in case of conflict.
	182	*/
	183	ret = marker_probe_register(channel, mname, NULL,
	184	probe->probe_func, pdata);
	185	if (ret)
	186	free(pdata);
	187	else
	188	list_add(&pdata->node, &markers_loaded_list);
	189	end:
f7b16408	190	pthread_mutex_unlock(&probes_mutex);
ba6459ba PMF	191	ltt_unlock_traces();
	192	return ret;
	193	}
ba6459ba PMF	194
	195	/*
	196	* Disconnect marker "mname", probe "pname".
	197	*/
	198	int ltt_marker_disconnect(const char channel, const char mname,
	199	const char *pname)
	200	{
	201	struct ltt_active_marker *pdata;
	202	struct ltt_available_probe *probe;
	203	int ret = 0;
	204
f7b16408	205	pthread_mutex_lock(&probes_mutex);
ba6459ba PMF	206	probe = get_probe_from_name(pname);
	207	if (!probe) {
	208	ret = -ENOENT;
	209	goto end;
	210	}
	211	pdata = marker_get_private_data(channel, mname, probe->probe_func, 0);
	212	if (IS_ERR(pdata)) {
	213	ret = PTR_ERR(pdata);
	214	goto end;
	215	} else if (!pdata) {
	216	/*
	217	* Not registered by us.
	218	*/
	219	ret = -EPERM;
	220	goto end;
	221	}
	222	ret = marker_probe_unregister(channel, mname, probe->probe_func, pdata);
	223	if (ret)
	224	goto end;
	225	else {
	226	list_del(&pdata->node);
	227	free(pdata);
	228	}
	229	end:
f7b16408	230	pthread_mutex_unlock(&probes_mutex);
ba6459ba PMF	231	return ret;
ba6459ba PMF	232	}
ba6459ba PMF	233
	234	/*
	235	* function handling proc entry write.
	236	*
	237	* connect <channel name> <marker name> [<probe name>]]
	238	* disconnect <channel name> <marker name> [<probe name>]
	239	*/
	240	//ust// static ssize_t ltt_write(struct file file, const char __user buffer,
	241	//ust// size_t count, loff_t *offset)
	242	//ust// {
	243	//ust// char *kbuf;
	244	//ust// char iter, marker_action, *arg[4];
	245	//ust// ssize_t ret;
	246	//ust// int i;
	247	//ust//
	248	//ust// if (!count)
	249	//ust// return -EINVAL;
	250	//ust//
	251	//ust// kbuf = vmalloc(count + 1);
	252	//ust// kbuf[count] = '\0'; /* Transform into a string */
	253	//ust// ret = copy_from_user(kbuf, buffer, count);
	254	//ust// if (ret) {
	255	//ust// ret = -EINVAL;
	256	//ust// goto end;
	257	//ust// }
	258	//ust// get_marker_string(kbuf, &marker_action, &iter);
	259	//ust// if (!marker_action \|\| marker_action == iter) {
	260	//ust// ret = -EINVAL;
	261	//ust// goto end;
	262	//ust// }
	263	//ust// for (i = 0; i < 4; i++) {
	264	//ust// arg[i] = NULL;
	265	//ust// if (iter < kbuf + count) {
	266	//ust// iter++; /* skip the added '\0' */
	267	//ust// get_marker_string(iter, &arg[i], &iter);
	268	//ust// if (arg[i] == iter)
	269	//ust// arg[i] = NULL;
	270	//ust// }
	271	//ust// }
	272	//ust//
	273	//ust// if (!arg[0] \|\| !arg[1]) {
	274	//ust// ret = -EINVAL;
	275	//ust// goto end;
	276	//ust// }
	277	//ust//
	278	//ust// if (!strcmp(marker_action, "connect")) {
	279	//ust// ret = ltt_marker_connect(arg[0], arg[1], arg[2]);
	280	//ust// if (ret)
	281	//ust// goto end;
	282	//ust// } else if (!strcmp(marker_action, "disconnect")) {
	283	//ust// ret = ltt_marker_disconnect(arg[0], arg[1], arg[2]);
	284	//ust// if (ret)
	285	//ust// goto end;
	286	//ust// }
	287	//ust// ret = count;
	288	//ust// end:
	289	//ust// vfree(kbuf);
	290	//ust// return ret;
	291	//ust// }
	292	//ust//
	293	//ust// static void s_next(struct seq_file m, void p, loff_t pos)
	294	//ust// {
	295	//ust// struct marker_iter *iter = m->private;
	296	//ust//
297	//ust// marker_iter_next(iter);
298	//ust// if (!iter->marker) {
299	//ust// /*
300	//ust// * Setting the iter module to -1UL will make sure
301	//ust// * that no module can possibly hold the current marker.
302	//ust// */
303	//ust// iter->module = (void *)-1UL;
304	//ust// return NULL;
305	//ust// }
306	//ust// return iter->marker;
307	//ust// }
308	//ust//
309	//ust// static void s_start(struct seq_file m, loff_t *pos)
310	//ust// {
311	//ust// struct marker_iter *iter = m->private;
312	//ust//
313	//ust// if (!*pos)
314	//ust// marker_iter_reset(iter);
315	//ust// marker_iter_start(iter);
316	//ust// if (!iter->marker) {
317	//ust// /*
318	//ust// * Setting the iter module to -1UL will make sure
319	//ust// * that no module can possibly hold the current marker.
320	//ust// */
321	//ust// iter->module = (void *)-1UL;
322	//ust// return NULL;
323	//ust// }
324	//ust// return iter->marker;
325	//ust// }
326	//ust//
327	//ust// static void s_stop(struct seq_file m, void p)
328	//ust// {
329	//ust// marker_iter_stop(m->private);
330	//ust// }
331	//ust//
332	//ust// static int s_show(struct seq_file m, void p)
333	//ust// {
334	//ust// struct marker_iter *iter = m->private;
335	//ust//
336	//ust// seq_printf(m, "channel: %s marker: %s format: \"%s\" state: %d "
337	//ust// "event_id: %hu call: 0x%p probe %s : 0x%p\n",
338	//ust// iter->marker->channel,
339	//ust// iter->marker->name, iter->marker->format,
340	//ust// _imv_read(iter->marker->state),
341	//ust// iter->marker->event_id,
342	//ust// iter->marker->call,
343	//ust// iter->marker->ptype ? "multi" : "single",
344	//ust// iter->marker->ptype ?
345	//ust// (void)iter->marker->multi : (void)iter->marker->single.func);
346	//ust// return 0;
347	//ust// }
348	//ust//
349	//ust// static const struct seq_operations ltt_seq_op = {
350	//ust// .start = s_start,
351	//ust// .next = s_next,
352	//ust// .stop = s_stop,
353	//ust// .show = s_show,
354	//ust// };
355	//ust//
356	//ust// static int ltt_open(struct inode inode, struct file file)
357	//ust// {
358	//ust// /*
359	//ust// * Iterator kept in m->private.
360	//ust// * Restart iteration on all modules between reads because we do not lock
361	//ust// * the module mutex between those.
362	//ust// */
363	//ust// int ret;
364	//ust// struct marker_iter *iter;
365	//ust//
366	//ust// iter = kzalloc(sizeof(*iter), GFP_KERNEL);
367	//ust// if (!iter)
368	//ust// return -ENOMEM;
369	//ust//
370	//ust// ret = seq_open(file, &ltt_seq_op);
371	//ust// if (ret == 0)
372	//ust// ((struct seq_file *)file->private_data)->private = iter;
373	//ust// else
374	//ust// kfree(iter);
375	//ust// return ret;
376	//ust// }
377	//ust//
378	//ust// static struct file_operations ltt_fops = {
379	//ust// .write = ltt_write,
380	//ust// .open = ltt_open,
381	//ust// .read = seq_read,
382	//ust// .llseek = seq_lseek,
383	//ust// .release = seq_release_private,
384	//ust// };
385
386	static void disconnect_all_markers(void)
387	{
388	struct ltt_active_marker pdata, tmp;
389
390	list_for_each_entry_safe(pdata, tmp, &markers_loaded_list, node) {
391	marker_probe_unregister_private_data(pdata->probe->probe_func,
392	pdata);
393	list_del(&pdata->node);
394	free(pdata);
395	}
396	}
397
4db647c5 PMF	398	static char initialized = 0;
	399
	400	void __attribute__((constructor)) init_marker_control(void)
ba6459ba	401	{
4db647c5 PMF	402	if(!initialized) {
4db647c5 PMF	403	int ret;
ba6459ba PMF	404
	405	//ust// pentry = create_proc_entry("ltt", S_IRUSR\|S_IWUSR, NULL);
	406	//ust// if (!pentry)
	407	//ust// return -EBUSY;
	408	//ust// markers_loaded_cachep = KMEM_CACHE(ltt_active_marker, 0);
	409
4db647c5 PMF	410	ret = ltt_probe_register(&default_probe);
	411	BUG_ON(ret);
	412	ret = ltt_marker_connect("metadata", "core_marker_format",
	413	DEFAULT_PROBE);
	414	BUG_ON(ret);
	415	ret = ltt_marker_connect("metadata", "core_marker_id", DEFAULT_PROBE);
	416	BUG_ON(ret);
ba6459ba PMF	417	//ust// pentry->proc_fops = &ltt_fops;
ba6459ba PMF	418
4db647c5 PMF	419	initialized = 1;
4db647c5 PMF	420	}
ba6459ba PMF	421	}
	422	//ust// module_init(marker_control_init);
	423
772030fe	424	static void __attribute__((destructor)) marker_control_exit(void)
ba6459ba PMF	425	{
	426	int ret;
	427
	428	//ust// remove_proc_entry("ltt", NULL);
	429	ret = ltt_marker_disconnect("metadata", "core_marker_format",
	430	DEFAULT_PROBE);
	431	BUG_ON(ret);
	432	ret = ltt_marker_disconnect("metadata", "core_marker_id",
	433	DEFAULT_PROBE);
	434	BUG_ON(ret);
	435	ret = ltt_probe_unregister(&default_probe);
	436	BUG_ON(ret);
	437	disconnect_all_markers();
	438	//ust// kmem_cache_destroy(markers_loaded_cachep);
	439	//ust// marker_synchronize_unregister();
	440	}
	441	//ust// module_exit(marker_control_exit);
	442
	443	//ust// MODULE_LICENSE("GPL");
	444	//ust// MODULE_AUTHOR("Mathieu Desnoyers");
	445	//ust// MODULE_DESCRIPTION("Linux Trace Toolkit Marker Control");