[lttng-modules.git] / src / probes / lttng-uprobes.c

/* SPDX-License-Identifier: (GPL-2.0-only OR LGPL-2.1-only)
 *
 * probes/lttng-uprobes.c
 *
 * LTTng uprobes integration module.
 *
 * Copyright (C) 2013 Yannick Brosseau <yannick.brosseau@gmail.com>
 * Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 */

#include <linux/fdtable.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/namei.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <lttng/events.h>
#include <lttng/tracer.h>
#include <wrapper/irqflags.h>
#include <ringbuffer/frontend_types.h>
#include <wrapper/uprobes.h>
#include <wrapper/vmalloc.h>

static
int lttng_uprobes_event_handler_pre(struct uprobe_consumer *uc, struct pt_regs *regs)
{
	struct lttng_uprobe_handler *uprobe_handler =
		container_of(uc, struct lttng_uprobe_handler, up_consumer);
	struct lttng_event *event = uprobe_handler->u.event;
	struct lttng_probe_ctx lttng_probe_ctx = {
		.event = event,
		.interruptible = !lttng_regs_irqs_disabled(regs),
	};
	struct lttng_channel *chan = event->chan;
	struct lib_ring_buffer_ctx ctx;
	int ret;

	struct {
		unsigned long ip;
	} payload;

	if (unlikely(!LTTNG_READ_ONCE(chan->session->active)))
		return 0;
	if (unlikely(!LTTNG_READ_ONCE(chan->enabled)))
		return 0;
	if (unlikely(!LTTNG_READ_ONCE(event->enabled)))
		return 0;

	lib_ring_buffer_ctx_init(&ctx, chan->chan, &lttng_probe_ctx,
		sizeof(payload), lttng_alignof(payload), -1);

	ret = chan->ops->event_reserve(&ctx, event->id);
	if (ret < 0)
		return 0;

	/* Event payload. */
	payload.ip = (unsigned long)instruction_pointer(regs);

	lib_ring_buffer_align_ctx(&ctx, lttng_alignof(payload));
	chan->ops->event_write(&ctx, &payload, sizeof(payload));
	chan->ops->event_commit(&ctx);
	return 0;
}

static
int lttng_uprobes_event_notifier_handler_pre(struct uprobe_consumer *uc, struct pt_regs *regs)
{
	struct lttng_uprobe_handler *uprobe_handler =
		container_of(uc, struct lttng_uprobe_handler, up_consumer);
	struct lttng_event_notifier *event_notifier = uprobe_handler->u.event_notifier;

	if (unlikely(!READ_ONCE(event_notifier->enabled)))
		return 0;

	event_notifier->send_notification(event_notifier, NULL, NULL);
	return 0;
}

/*
 * Create event description.
 */
static
int lttng_create_uprobe_event(const char *name, struct lttng_event *event)
{
	struct lttng_event_desc *desc;
	struct lttng_event_field *fields;
	int ret;

	desc = kzalloc(sizeof(*event->desc), GFP_KERNEL);
	if (!desc)
		return -ENOMEM;
	desc->name = kstrdup(name, GFP_KERNEL);
	if (!desc->name) {
		ret = -ENOMEM;
		goto error_str;
	}

	desc->nr_fields = 1;
	desc->fields = fields =
		kzalloc(1 * sizeof(struct lttng_event_field), GFP_KERNEL);

	if (!desc->fields) {
		ret = -ENOMEM;
		goto error_fields;
	}
	fields[0].name = "ip";
	fields[0].type.atype = atype_integer;
	fields[0].type.u.integer.size = sizeof(unsigned long) * CHAR_BIT;
	fields[0].type.u.integer.alignment = lttng_alignof(unsigned long) * CHAR_BIT;
	fields[0].type.u.integer.signedness = lttng_is_signed_type(unsigned long);
	fields[0].type.u.integer.reverse_byte_order = 0;
	fields[0].type.u.integer.base = 16;
	fields[0].type.u.integer.encoding = lttng_encode_none;

	desc->owner = THIS_MODULE;
	event->desc = desc;

	return 0;

error_fields:
	kfree(desc->name);
error_str:
	kfree(desc);
	return ret;
}

/*
 * Create event_notifier description.
 */
static
int lttng_create_uprobe_event_notifier(const char *name, struct lttng_event_notifier *event_notifier)
{
	struct lttng_event_desc *desc;
	int ret;

	desc = kzalloc(sizeof(*event_notifier->desc), GFP_KERNEL);
	if (!desc)
		return -ENOMEM;
	desc->name = kstrdup(name, GFP_KERNEL);
	if (!desc->name) {
		ret = -ENOMEM;
		goto error_str;
	}

	desc->nr_fields = 0;

	desc->owner = THIS_MODULE;
	event_notifier->desc = desc;

	return 0;

error_str:
	kfree(desc);
	return ret;
}

/*
 * Returns the inode struct from the current task and an fd. The inode is
 * grabbed by this function and must be put once we are done with it using
 * iput().
 */
static struct inode *get_inode_from_fd(int fd)
{
	struct file *file;
	struct inode *inode;

	rcu_read_lock();
	/*
	 * Returns the file backing the given fd. Needs to be done inside an RCU
	 * critical section.
	 */
	file = fcheck(fd);
	if (file == NULL) {
		printk(KERN_WARNING "LTTng: Cannot access file backing the fd(%d)\n", fd);
		inode = NULL;
		goto error;
	}

	/* Grab a reference on the inode. */
	inode = igrab(file->f_path.dentry->d_inode);
	if (inode == NULL)
		printk(KERN_WARNING "LTTng: Cannot grab a reference on the inode.\n");
error:
	rcu_read_unlock();
	return inode;
}


static
int lttng_uprobes_add_callsite(struct lttng_uprobe *uprobe,
	struct lttng_kernel_event_callsite __user *callsite,
	int (*handler)(struct uprobe_consumer *self, struct pt_regs *regs),
	void *priv_data)
{
	int ret = 0;
	struct lttng_uprobe_handler *uprobe_handler;

	if (!priv_data) {
		ret = -EINVAL;
		goto end;
	}

	uprobe_handler = kzalloc(sizeof(struct lttng_uprobe_handler), GFP_KERNEL);
	if (!uprobe_handler) {
		printk(KERN_WARNING "LTTng: Error allocating uprobe_handler");
		ret = -ENOMEM;
		goto end;
	}

	/* Ensure the memory we just allocated don't event_notifier page faults. */
	wrapper_vmalloc_sync_mappings();

	uprobe_handler->u.event = priv_data;
	uprobe_handler->up_consumer.handler = handler;

	ret = copy_from_user(&uprobe_handler->offset, &callsite->u.uprobe.offset, sizeof(uint64_t));
	if (ret) {
		goto register_error;
	}

	ret = wrapper_uprobe_register(uprobe->inode,
		      uprobe_handler->offset, &uprobe_handler->up_consumer);
	if (ret) {
		printk(KERN_WARNING "LTTng: Error registering probe on inode %lu "
		       "and offset 0x%llx\n", uprobe->inode->i_ino,
		       uprobe_handler->offset);
		ret = -1;
		goto register_error;
	}

	list_add(&uprobe_handler->node, &uprobe->head);

	return ret;

register_error:
	kfree(uprobe_handler);
end:
	return ret;
}

int lttng_uprobes_event_add_callsite(struct lttng_event *event,
	struct lttng_kernel_event_callsite __user *callsite)
{
	return lttng_uprobes_add_callsite(&event->u.uprobe, callsite,
		lttng_uprobes_event_handler_pre, event);
}
EXPORT_SYMBOL_GPL(lttng_uprobes_event_add_callsite);

int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
	struct lttng_kernel_event_callsite __user *callsite)
{
	return lttng_uprobes_add_callsite(&event_notifier->u.uprobe, callsite,
		lttng_uprobes_event_notifier_handler_pre, event_notifier);
}
EXPORT_SYMBOL_GPL(lttng_uprobes_event_notifier_add_callsite);

static
int lttng_uprobes_register(struct lttng_uprobe *uprobe, int fd)
{
	int ret = 0;
	struct inode *inode;

	inode = get_inode_from_fd(fd);
	if (!inode) {
		printk(KERN_WARNING "LTTng: Cannot get inode from fd\n");
		ret = -EBADF;
		goto inode_error;
	}
	uprobe->inode = inode;
	INIT_LIST_HEAD(&uprobe->head);

inode_error:
	return ret;
}

int lttng_uprobes_register_event(const char *name, int fd, struct lttng_event *event)
{
	int ret = 0;

	ret = lttng_create_uprobe_event(name, event);
	if (ret)
		goto error;

	ret = lttng_uprobes_register(&event->u.uprobe, fd);
	if (ret)
		goto register_error;

	return 0;

register_error:
	kfree(event->desc->name);
	kfree(event->desc);
error:
	return ret;
}
EXPORT_SYMBOL_GPL(lttng_uprobes_register_event);

int lttng_uprobes_register_event_notifier(const char *name, int fd,
		struct lttng_event_notifier *event_notifier)
{
	int ret = 0;

	ret = lttng_create_uprobe_event_notifier(name, event_notifier);
	if (ret)
		goto error;

	ret = lttng_uprobes_register(&event_notifier->u.uprobe, fd);
	if (ret)
		goto register_error;

	return 0;

register_error:
	kfree(event_notifier->desc->name);
	kfree(event_notifier->desc);
error:
	return ret;
}
EXPORT_SYMBOL_GPL(lttng_uprobes_register_event_notifier);

static
void lttng_uprobes_unregister(struct inode *inode, struct list_head *head)
{
	struct lttng_uprobe_handler *iter, *tmp;

	/*
	 * Iterate over the list of handler, remove each handler from the list
	 * and free the struct.
	 */
	list_for_each_entry_safe(iter, tmp, head, node) {
		wrapper_uprobe_unregister(inode, iter->offset, &iter->up_consumer);
		list_del(&iter->node);
		kfree(iter);
	}

}

void lttng_uprobes_unregister_event(struct lttng_event *event)
{
	lttng_uprobes_unregister(event->u.uprobe.inode, &event->u.uprobe.head);
}
EXPORT_SYMBOL_GPL(lttng_uprobes_unregister_event);

void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
{
	lttng_uprobes_unregister(event_notifier->u.uprobe.inode, &event_notifier->u.uprobe.head);
}
EXPORT_SYMBOL_GPL(lttng_uprobes_unregister_event_notifier);

void lttng_uprobes_destroy_event_private(struct lttng_event *event)
{
	iput(event->u.uprobe.inode);
	kfree(event->desc->name);
	kfree(event->desc);
}
EXPORT_SYMBOL_GPL(lttng_uprobes_destroy_event_private);

void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
{
	iput(event_notifier->u.uprobe.inode);
	kfree(event_notifier->desc->name);
	kfree(event_notifier->desc);
}
EXPORT_SYMBOL_GPL(lttng_uprobes_destroy_event_notifier_private);

MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("Yannick Brosseau");
MODULE_DESCRIPTION("Linux Trace Toolkit Uprobes Support");
Commit	Line	Data
b7cdc182	1	/* SPDX-License-Identifier: (GPL-2.0-only OR LGPL-2.1-only)
8134eb60	2	*
149b9a9d YB	3	* probes/lttng-uprobes.c
	4	*
	5	* LTTng uprobes integration module.
	6	*
	7	* Copyright (C) 2013 Yannick Brosseau <yannick.brosseau@gmail.com>
	8	* Copyright (C) 2009-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	9	*
149b9a9d YB	10	*/
	11
	12	#include <linux/fdtable.h>
3aed4dca	13	#include <linux/list.h>
149b9a9d YB	14	#include <linux/module.h>
	15	#include <linux/namei.h>
	16	#include <linux/slab.h>
3aed4dca	17	#include <linux/uaccess.h>
2df37e95 MD	18	#include <lttng/events.h>
2df37e95 MD	19	#include <lttng/tracer.h>
149b9a9d	20	#include <wrapper/irqflags.h>
24591303	21	#include <ringbuffer/frontend_types.h>
149b9a9d YB	22	#include <wrapper/uprobes.h>
	23	#include <wrapper/vmalloc.h>
	24
	25	static
83b802dc	26	int lttng_uprobes_event_handler_pre(struct uprobe_consumer uc, struct pt_regs regs)
149b9a9d	27	{
3aed4dca FD	28	struct lttng_uprobe_handler *uprobe_handler =
3aed4dca FD	29	container_of(uc, struct lttng_uprobe_handler, up_consumer);
83b802dc	30	struct lttng_event *event = uprobe_handler->u.event;
149b9a9d YB	31	struct lttng_probe_ctx lttng_probe_ctx = {
	32	.event = event,
	33	.interruptible = !lttng_regs_irqs_disabled(regs),
	34	};
	35	struct lttng_channel *chan = event->chan;
	36	struct lib_ring_buffer_ctx ctx;
	37	int ret;
	38
	39	struct {
	40	unsigned long ip;
56377c91	41	} payload;
149b9a9d	42
585e5dcc	43	if (unlikely(!LTTNG_READ_ONCE(chan->session->active)))
149b9a9d	44	return 0;
585e5dcc	45	if (unlikely(!LTTNG_READ_ONCE(chan->enabled)))
149b9a9d	46	return 0;
585e5dcc	47	if (unlikely(!LTTNG_READ_ONCE(event->enabled)))
149b9a9d YB	48	return 0;
	49
	50	lib_ring_buffer_ctx_init(&ctx, chan->chan, &lttng_probe_ctx,
	51	sizeof(payload), lttng_alignof(payload), -1);
	52
	53	ret = chan->ops->event_reserve(&ctx, event->id);
	54	if (ret < 0)
	55	return 0;
	56
	57	/* Event payload. */
7445d54f	58	payload.ip = (unsigned long)instruction_pointer(regs);
56377c91	59
149b9a9d YB	60	lib_ring_buffer_align_ctx(&ctx, lttng_alignof(payload));
	61	chan->ops->event_write(&ctx, &payload, sizeof(payload));
	62	chan->ops->event_commit(&ctx);
	63	return 0;
	64	}
	65
9de67196 FD	66	static
	67	int lttng_uprobes_event_notifier_handler_pre(struct uprobe_consumer uc, struct pt_regs regs)
	68	{
	69	struct lttng_uprobe_handler *uprobe_handler =
	70	container_of(uc, struct lttng_uprobe_handler, up_consumer);
	71	struct lttng_event_notifier *event_notifier = uprobe_handler->u.event_notifier;
	72
	73	if (unlikely(!READ_ONCE(event_notifier->enabled)))
	74	return 0;
	75
99d223ad	76	event_notifier->send_notification(event_notifier, NULL, NULL);
9de67196 FD	77	return 0;
	78	}
	79
149b9a9d YB	80	/*
	81	* Create event description.
	82	*/
	83	static
	84	int lttng_create_uprobe_event(const char name, struct lttng_event event)
	85	{
	86	struct lttng_event_desc *desc;
	87	struct lttng_event_field *fields;
	88	int ret;
	89
	90	desc = kzalloc(sizeof(*event->desc), GFP_KERNEL);
	91	if (!desc)
	92	return -ENOMEM;
	93	desc->name = kstrdup(name, GFP_KERNEL);
	94	if (!desc->name) {
	95	ret = -ENOMEM;
	96	goto error_str;
	97	}
	98
	99	desc->nr_fields = 1;
	100	desc->fields = fields =
	101	kzalloc(1 * sizeof(struct lttng_event_field), GFP_KERNEL);
	102
	103	if (!desc->fields) {
	104	ret = -ENOMEM;
	105	goto error_fields;
	106	}
	107	fields[0].name = "ip";
	108	fields[0].type.atype = atype_integer;
ceabb767 MD	109	fields[0].type.u.integer.size = sizeof(unsigned long) * CHAR_BIT;
	110	fields[0].type.u.integer.alignment = lttng_alignof(unsigned long) * CHAR_BIT;
	111	fields[0].type.u.integer.signedness = lttng_is_signed_type(unsigned long);
	112	fields[0].type.u.integer.reverse_byte_order = 0;
	113	fields[0].type.u.integer.base = 16;
	114	fields[0].type.u.integer.encoding = lttng_encode_none;
149b9a9d YB	115
	116	desc->owner = THIS_MODULE;
	117	event->desc = desc;
	118
	119	return 0;
	120
	121	error_fields:
	122	kfree(desc->name);
	123	error_str:
	124	kfree(desc);
	125	return ret;
	126	}
	127
9de67196 FD	128	/*
	129	* Create event_notifier description.
	130	*/
	131	static
	132	int lttng_create_uprobe_event_notifier(const char name, struct lttng_event_notifier event_notifier)
	133	{
	134	struct lttng_event_desc *desc;
	135	int ret;
	136
	137	desc = kzalloc(sizeof(*event_notifier->desc), GFP_KERNEL);
	138	if (!desc)
	139	return -ENOMEM;
	140	desc->name = kstrdup(name, GFP_KERNEL);
	141	if (!desc->name) {
	142	ret = -ENOMEM;
	143	goto error_str;
	144	}
	145
	146	desc->nr_fields = 0;
	147
	148	desc->owner = THIS_MODULE;
	149	event_notifier->desc = desc;
	150
	151	return 0;
	152
	153	error_str:
	154	kfree(desc);
	155	return ret;
	156	}
	157
56377c91 FD	158	/*
	159	* Returns the inode struct from the current task and an fd. The inode is
	160	* grabbed by this function and must be put once we are done with it using
	161	* iput().
	162	*/
	163	static struct inode *get_inode_from_fd(int fd)
	164	{
	165	struct file *file;
	166	struct inode *inode;
	167
	168	rcu_read_lock();
	169	/*
	170	* Returns the file backing the given fd. Needs to be done inside an RCU
	171	* critical section.
	172	*/
	173	file = fcheck(fd);
	174	if (file == NULL) {
5a15f70c	175	printk(KERN_WARNING "LTTng: Cannot access file backing the fd(%d)\n", fd);
56377c91 FD	176	inode = NULL;
	177	goto error;
	178	}
	179
	180	/* Grab a reference on the inode. */
	181	inode = igrab(file->f_path.dentry->d_inode);
	182	if (inode == NULL)
5a15f70c	183	printk(KERN_WARNING "LTTng: Cannot grab a reference on the inode.\n");
56377c91 FD	184	error:
	185	rcu_read_unlock();
	186	return inode;
	187	}
	188
83b802dc FD	189
	190	static
	191	int lttng_uprobes_add_callsite(struct lttng_uprobe *uprobe,
	192	struct lttng_kernel_event_callsite __user *callsite,
	193	int (handler)(struct uprobe_consumer self, struct pt_regs *regs),
	194	void *priv_data)
149b9a9d	195	{
3aed4dca FD	196	int ret = 0;
	197	struct lttng_uprobe_handler *uprobe_handler;
	198
83b802dc	199	if (!priv_data) {
3aed4dca FD	200	ret = -EINVAL;
	201	goto end;
	202	}
	203
	204	uprobe_handler = kzalloc(sizeof(struct lttng_uprobe_handler), GFP_KERNEL);
	205	if (!uprobe_handler) {
5a15f70c	206	printk(KERN_WARNING "LTTng: Error allocating uprobe_handler");
3aed4dca FD	207	ret = -ENOMEM;
	208	goto end;
	209	}
	210
9de67196	211	/* Ensure the memory we just allocated don't event_notifier page faults. */
263b6c88	212	wrapper_vmalloc_sync_mappings();
3aed4dca	213
83b802dc FD	214	uprobe_handler->u.event = priv_data;
83b802dc FD	215	uprobe_handler->up_consumer.handler = handler;
3aed4dca FD	216
	217	ret = copy_from_user(&uprobe_handler->offset, &callsite->u.uprobe.offset, sizeof(uint64_t));
	218	if (ret) {
	219	goto register_error;
	220	}
	221
83b802dc	222	ret = wrapper_uprobe_register(uprobe->inode,
3aed4dca FD	223	uprobe_handler->offset, &uprobe_handler->up_consumer);
3aed4dca FD	224	if (ret) {
5a15f70c	225	printk(KERN_WARNING "LTTng: Error registering probe on inode %lu "
83b802dc	226	"and offset 0x%llx\n", uprobe->inode->i_ino,
3aed4dca FD	227	uprobe_handler->offset);
	228	ret = -1;
	229	goto register_error;
	230	}
	231
83b802dc	232	list_add(&uprobe_handler->node, &uprobe->head);
3aed4dca FD	233
	234	return ret;
	235
	236	register_error:
	237	kfree(uprobe_handler);
	238	end:
	239	return ret;
	240	}
3aed4dca	241
83b802dc FD	242	int lttng_uprobes_event_add_callsite(struct lttng_event *event,
	243	struct lttng_kernel_event_callsite __user *callsite)
	244	{
	245	return lttng_uprobes_add_callsite(&event->u.uprobe, callsite,
	246	lttng_uprobes_event_handler_pre, event);
	247	}
	248	EXPORT_SYMBOL_GPL(lttng_uprobes_event_add_callsite);
	249
9de67196 FD	250	int lttng_uprobes_event_notifier_add_callsite(struct lttng_event_notifier *event_notifier,
	251	struct lttng_kernel_event_callsite __user *callsite)
	252	{
	253	return lttng_uprobes_add_callsite(&event_notifier->u.uprobe, callsite,
	254	lttng_uprobes_event_notifier_handler_pre, event_notifier);
	255	}
	256	EXPORT_SYMBOL_GPL(lttng_uprobes_event_notifier_add_callsite);
	257
83b802dc FD	258	static
83b802dc FD	259	int lttng_uprobes_register(struct lttng_uprobe *uprobe, int fd)
3aed4dca FD	260	{
3aed4dca FD	261	int ret = 0;
56377c91	262	struct inode *inode;
149b9a9d	263
56377c91 FD	264	inode = get_inode_from_fd(fd);
56377c91 FD	265	if (!inode) {
5a15f70c	266	printk(KERN_WARNING "LTTng: Cannot get inode from fd\n");
56377c91 FD	267	ret = -EBADF;
	268	goto inode_error;
	269	}
83b802dc FD	270	uprobe->inode = inode;
	271	INIT_LIST_HEAD(&uprobe->head);
	272
	273	inode_error:
	274	return ret;
	275	}
	276
	277	int lttng_uprobes_register_event(const char name, int fd, struct lttng_event event)
	278	{
	279	int ret = 0;
	280
	281	ret = lttng_create_uprobe_event(name, event);
	282	if (ret)
	283	goto error;
	284
	285	ret = lttng_uprobes_register(&event->u.uprobe, fd);
	286	if (ret)
	287	goto register_error;
149b9a9d	288
149b9a9d YB	289	return 0;
149b9a9d YB	290
83b802dc	291	register_error:
149b9a9d YB	292	kfree(event->desc->name);
	293	kfree(event->desc);
	294	error:
	295	return ret;
	296	}
83b802dc	297	EXPORT_SYMBOL_GPL(lttng_uprobes_register_event);
149b9a9d	298
9de67196 FD	299	int lttng_uprobes_register_event_notifier(const char *name, int fd,
	300	struct lttng_event_notifier *event_notifier)
	301	{
	302	int ret = 0;
	303
	304	ret = lttng_create_uprobe_event_notifier(name, event_notifier);
	305	if (ret)
	306	goto error;
	307
	308	ret = lttng_uprobes_register(&event_notifier->u.uprobe, fd);
	309	if (ret)
	310	goto register_error;
	311
	312	return 0;
	313
	314	register_error:
	315	kfree(event_notifier->desc->name);
	316	kfree(event_notifier->desc);
	317	error:
	318	return ret;
	319	}
	320	EXPORT_SYMBOL_GPL(lttng_uprobes_register_event_notifier);
	321
	322	static
	323	void lttng_uprobes_unregister(struct inode inode, struct list_head head)
149b9a9d	324	{
3aed4dca FD	325	struct lttng_uprobe_handler iter, tmp;
	326
	327	/*
	328	* Iterate over the list of handler, remove each handler from the list
	329	* and free the struct.
	330	*/
9de67196 FD	331	list_for_each_entry_safe(iter, tmp, head, node) {
9de67196 FD	332	wrapper_uprobe_unregister(inode, iter->offset, &iter->up_consumer);
3aed4dca FD	333	list_del(&iter->node);
	334	kfree(iter);
	335	}
9de67196 FD	336
	337	}
	338
	339	void lttng_uprobes_unregister_event(struct lttng_event *event)
	340	{
	341	lttng_uprobes_unregister(event->u.uprobe.inode, &event->u.uprobe.head);
149b9a9d	342	}
83b802dc	343	EXPORT_SYMBOL_GPL(lttng_uprobes_unregister_event);
149b9a9d	344
9de67196 FD	345	void lttng_uprobes_unregister_event_notifier(struct lttng_event_notifier *event_notifier)
	346	{
	347	lttng_uprobes_unregister(event_notifier->u.uprobe.inode, &event_notifier->u.uprobe.head);
	348	}
	349	EXPORT_SYMBOL_GPL(lttng_uprobes_unregister_event_notifier);
	350
83b802dc	351	void lttng_uprobes_destroy_event_private(struct lttng_event *event)
149b9a9d YB	352	{
	353	iput(event->u.uprobe.inode);
	354	kfree(event->desc->name);
	355	kfree(event->desc);
	356	}
83b802dc	357	EXPORT_SYMBOL_GPL(lttng_uprobes_destroy_event_private);
149b9a9d	358
9de67196 FD	359	void lttng_uprobes_destroy_event_notifier_private(struct lttng_event_notifier *event_notifier)
	360	{
	361	iput(event_notifier->u.uprobe.inode);
	362	kfree(event_notifier->desc->name);
	363	kfree(event_notifier->desc);
	364	}
	365	EXPORT_SYMBOL_GPL(lttng_uprobes_destroy_event_notifier_private);
	366
149b9a9d YB	367	MODULE_LICENSE("GPL and additional rights");
	368	MODULE_AUTHOR("Yannick Brosseau");
	369	MODULE_DESCRIPTION("Linux Trace Toolkit Uprobes Support");