[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 <wrapper/fdtable.h>
#include <linux/file.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/events-internal.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_kernel_event_common *event = uprobe_handler->event;
	struct lttng_kernel_probe_ctx lttng_probe_ctx = {
		.event = event,
		.interruptible = !lttng_regs_irqs_disabled(regs),
	};
	struct {
		unsigned long ip;
	} payload;

	switch (event->type) {
	case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
	{
		struct lttng_kernel_event_recorder *event_recorder =
			container_of(event, struct lttng_kernel_event_recorder, parent);
		struct lttng_kernel_channel_buffer *chan = event_recorder->chan;

		if (unlikely(!LTTNG_READ_ONCE(chan->parent.session->active)))
			return 0;
		if (unlikely(!LTTNG_READ_ONCE(chan->parent.enabled)))
			return 0;
		break;
	}
	case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
		break;
	default:
		WARN_ON_ONCE(1);
	}

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

	switch (event->type) {
	case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
	{
		struct lttng_kernel_event_recorder *event_recorder =
			container_of(event, struct lttng_kernel_event_recorder, parent);
		struct lttng_kernel_channel_buffer *chan = event_recorder->chan;
		struct lttng_kernel_ring_buffer_ctx ctx;
		int ret;

		lib_ring_buffer_ctx_init(&ctx, event_recorder,
			sizeof(payload), lttng_alignof(payload), &lttng_probe_ctx);

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

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

		chan->ops->event_write(&ctx, &payload, sizeof(payload), lttng_alignof(payload));
		chan->ops->event_commit(&ctx);
		break;
	}
	case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
	{
		struct lttng_kernel_event_notifier *event_notifier =
			container_of(event, struct lttng_kernel_event_notifier, parent);
		struct lttng_kernel_notification_ctx notif_ctx;

		notif_ctx.eval_capture = LTTNG_READ_ONCE(event_notifier->eval_capture);
		event_notifier->notification_send(event_notifier, NULL, NULL, &notif_ctx);
		break;
	}
	default:
		WARN_ON_ONCE(1);
	}
	return 0;
}

static const struct lttng_kernel_event_field *event_fields[] = {
	lttng_kernel_static_event_field("ip",
		lttng_kernel_static_type_integer_from_type(unsigned long, __BYTE_ORDER, 16),
		false, false),
};

static const struct lttng_kernel_tracepoint_class tp_class = {
	.nr_fields = ARRAY_SIZE(event_fields),
	.fields = event_fields,
};

/*
 * Create event description.
 */
static
int lttng_create_uprobe_event(const char *name, struct lttng_kernel_event_recorder *event_recorder)
{
	struct lttng_kernel_event_desc *desc;
	int ret;

	desc = kzalloc(sizeof(*desc), GFP_KERNEL);
	if (!desc)
		return -ENOMEM;
	desc->tp_class = &tp_class;
	desc->event_name = kstrdup(name, GFP_KERNEL);
	if (!desc->event_name) {
		ret = -ENOMEM;
		goto error_str;
	}
	desc->owner = THIS_MODULE;
	event_recorder->priv->parent.desc = desc;

	return 0;

error_str:
	kfree(desc);
	return ret;
}

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

	desc = kzalloc(sizeof(*desc), GFP_KERNEL);
	if (!desc)
		return -ENOMEM;
	desc->tp_class = &tp_class;
	desc->event_name = kstrdup(name, GFP_KERNEL);
	if (!desc->event_name) {
		ret = -ENOMEM;
		goto error_str;
	}
	desc->owner = THIS_MODULE;
	event_notifier->priv->parent.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 = lttng_lookup_fdget_rcu(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();
	if (file)
		fput(file);
	return inode;
}


static
int lttng_uprobes_add_callsite(struct lttng_uprobe *uprobe,
	struct lttng_kernel_abi_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 notify page faults. */
	wrapper_vmalloc_sync_mappings();

	uprobe_handler->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_kernel_event_common *event,
	struct lttng_kernel_abi_event_callsite __user *callsite)
{
	return lttng_uprobes_add_callsite(&event->priv->u.uprobe, callsite,
		lttng_uprobes_event_handler_pre, event);
}
EXPORT_SYMBOL_GPL(lttng_uprobes_event_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_kernel_event_recorder *event_recorder)
{
	int ret = 0;

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

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

	return 0;

register_error:
	kfree(event_recorder->priv->parent.desc->event_name);
	kfree(event_recorder->priv->parent.desc);
error:
	return ret;
}
EXPORT_SYMBOL_GPL(lttng_uprobes_register_event);

int lttng_uprobes_register_event_notifier(const char *name, int fd,
		struct lttng_kernel_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->priv->parent.u.uprobe, fd);
	if (ret)
		goto register_error;

	return 0;

register_error:
	kfree(event_notifier->priv->parent.desc->event_name);
	kfree(event_notifier->priv->parent.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_kernel_event_recorder *event_recorder)
{
	lttng_uprobes_unregister(event_recorder->priv->parent.u.uprobe.inode, &event_recorder->priv->parent.u.uprobe.head);
}
EXPORT_SYMBOL_GPL(lttng_uprobes_unregister_event);

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

void lttng_uprobes_destroy_event_private(struct lttng_kernel_event_recorder *event_recorder)
{
	iput(event_recorder->priv->parent.u.uprobe.inode);
	kfree(event_recorder->priv->parent.desc->event_name);
	kfree(event_recorder->priv->parent.desc);
}
EXPORT_SYMBOL_GPL(lttng_uprobes_destroy_event_private);

void lttng_uprobes_destroy_event_notifier_private(struct lttng_kernel_event_notifier *event_notifier)
{
	iput(event_notifier->priv->parent.u.uprobe.inode);
	kfree(event_notifier->priv->parent.desc->event_name);
	kfree(event_notifier->priv->parent.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	*/
149b9a9d YB	11
0aebcd68	12	#include <wrapper/fdtable.h>
9f945e81	13	#include <linux/file.h>
3aed4dca	14	#include <linux/list.h>
149b9a9d YB	15	#include <linux/module.h>
	16	#include <linux/namei.h>
	17	#include <linux/slab.h>
3aed4dca	18	#include <linux/uaccess.h>
2df37e95	19	#include <lttng/events.h>
a67ba386	20	#include <lttng/events-internal.h>
2df37e95	21	#include <lttng/tracer.h>
149b9a9d	22	#include <wrapper/irqflags.h>
24591303	23	#include <ringbuffer/frontend_types.h>
149b9a9d YB	24	#include <wrapper/uprobes.h>
	25	#include <wrapper/vmalloc.h>
	26
	27	static
83b802dc	28	int lttng_uprobes_event_handler_pre(struct uprobe_consumer uc, struct pt_regs regs)
149b9a9d	29	{
3aed4dca FD	30	struct lttng_uprobe_handler *uprobe_handler =
3aed4dca FD	31	container_of(uc, struct lttng_uprobe_handler, up_consumer);
e2d5dbc7	32	struct lttng_kernel_event_common *event = uprobe_handler->event;
346cb5ee	33	struct lttng_kernel_probe_ctx lttng_probe_ctx = {
e2d5dbc7	34	.event = event,
149b9a9d YB	35	.interruptible = !lttng_regs_irqs_disabled(regs),
149b9a9d YB	36	};
149b9a9d YB	37	struct {
149b9a9d YB	38	unsigned long ip;
56377c91	39	} payload;
149b9a9d	40
e2d5dbc7 MD	41	switch (event->type) {
	42	case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
	43	{
	44	struct lttng_kernel_event_recorder *event_recorder =
	45	container_of(event, struct lttng_kernel_event_recorder, parent);
ac847066	46	struct lttng_kernel_channel_buffer *chan = event_recorder->chan;
e2d5dbc7	47
ac847066	48	if (unlikely(!LTTNG_READ_ONCE(chan->parent.session->active)))
e2d5dbc7	49	return 0;
ac847066	50	if (unlikely(!LTTNG_READ_ONCE(chan->parent.enabled)))
e2d5dbc7 MD	51	return 0;
	52	break;
	53	}
	54	case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
	55	break;
	56	default:
	57	WARN_ON_ONCE(1);
	58	}
9de67196	59
e2d5dbc7	60	if (unlikely(!LTTNG_READ_ONCE(event->enabled)))
9de67196 FD	61	return 0;
9de67196 FD	62
e2d5dbc7 MD	63	switch (event->type) {
	64	case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
	65	{
	66	struct lttng_kernel_event_recorder *event_recorder =
	67	container_of(event, struct lttng_kernel_event_recorder, parent);
ac847066	68	struct lttng_kernel_channel_buffer *chan = event_recorder->chan;
e27e4381	69	struct lttng_kernel_ring_buffer_ctx ctx;
e2d5dbc7 MD	70	int ret;
e2d5dbc7 MD	71
c7d9db61 MD	72	lib_ring_buffer_ctx_init(&ctx, event_recorder,
c7d9db61 MD	73	sizeof(payload), lttng_alignof(payload), &lttng_probe_ctx);
e2d5dbc7	74
cefd899f	75	ret = chan->ops->event_reserve(&ctx);
e2d5dbc7 MD	76	if (ret < 0)
	77	return 0;
	78
	79	/* Event payload. */
	80	payload.ip = (unsigned long)instruction_pointer(regs);
	81
77fcffef	82	chan->ops->event_write(&ctx, &payload, sizeof(payload), lttng_alignof(payload));
e2d5dbc7 MD	83	chan->ops->event_commit(&ctx);
	84	break;
	85	}
	86	case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
	87	{
	88	struct lttng_kernel_event_notifier *event_notifier =
	89	container_of(event, struct lttng_kernel_event_notifier, parent);
	90	struct lttng_kernel_notification_ctx notif_ctx;
	91
	92	notif_ctx.eval_capture = LTTNG_READ_ONCE(event_notifier->eval_capture);
	93	event_notifier->notification_send(event_notifier, NULL, NULL, &notif_ctx);
	94	break;
	95	}
	96	default:
	97	WARN_ON_ONCE(1);
	98	}
9de67196 FD	99	return 0;
	100	}
	101
e69abdfd MD	102	static const struct lttng_kernel_event_field *event_fields[] = {
	103	lttng_kernel_static_event_field("ip",
	104	lttng_kernel_static_type_integer_from_type(unsigned long, __BYTE_ORDER, 16),
07aafa15	105	false, false),
e69abdfd MD	106	};
	107
	108	static const struct lttng_kernel_tracepoint_class tp_class = {
	109	.nr_fields = ARRAY_SIZE(event_fields),
	110	.fields = event_fields,
	111	};
437d5aa5	112
149b9a9d YB	113	/*
	114	* Create event description.
	115	*/
	116	static
a67ba386	117	int lttng_create_uprobe_event(const char name, struct lttng_kernel_event_recorder event_recorder)
149b9a9d	118	{
437d5aa5	119	struct lttng_kernel_event_desc *desc;
149b9a9d YB	120	int ret;
149b9a9d YB	121
437d5aa5	122	desc = kzalloc(sizeof(*desc), GFP_KERNEL);
149b9a9d YB	123	if (!desc)
149b9a9d YB	124	return -ENOMEM;
e69abdfd	125	desc->tp_class = &tp_class;
437d5aa5 MD	126	desc->event_name = kstrdup(name, GFP_KERNEL);
437d5aa5 MD	127	if (!desc->event_name) {
149b9a9d YB	128	ret = -ENOMEM;
	129	goto error_str;
	130	}
149b9a9d	131	desc->owner = THIS_MODULE;
a67ba386	132	event_recorder->priv->parent.desc = desc;
149b9a9d YB	133
	134	return 0;
	135
149b9a9d YB	136	error_str:
	137	kfree(desc);
	138	return ret;
	139	}
	140
9de67196 FD	141	/*
	142	* Create event_notifier description.
	143	*/
	144	static
a67ba386	145	int lttng_create_uprobe_event_notifier(const char name, struct lttng_kernel_event_notifier event_notifier)
9de67196	146	{
437d5aa5	147	struct lttng_kernel_event_desc *desc;
9de67196 FD	148	int ret;
9de67196 FD	149
437d5aa5	150	desc = kzalloc(sizeof(*desc), GFP_KERNEL);
9de67196 FD	151	if (!desc)
9de67196 FD	152	return -ENOMEM;
e69abdfd	153	desc->tp_class = &tp_class;
437d5aa5 MD	154	desc->event_name = kstrdup(name, GFP_KERNEL);
437d5aa5 MD	155	if (!desc->event_name) {
9de67196 FD	156	ret = -ENOMEM;
	157	goto error_str;
	158	}
9de67196	159	desc->owner = THIS_MODULE;
a67ba386	160	event_notifier->priv->parent.desc = desc;
9de67196 FD	161
	162	return 0;
	163
	164	error_str:
	165	kfree(desc);
	166	return ret;
	167	}
	168
56377c91 FD	169	/*
	170	* Returns the inode struct from the current task and an fd. The inode is
	171	* grabbed by this function and must be put once we are done with it using
	172	* iput().
	173	*/
	174	static struct inode *get_inode_from_fd(int fd)
	175	{
	176	struct file *file;
	177	struct inode *inode;
	178
	179	rcu_read_lock();
	180	/*
	181	* Returns the file backing the given fd. Needs to be done inside an RCU
	182	* critical section.
	183	*/
9f945e81	184	file = lttng_lookup_fdget_rcu(fd);
56377c91	185	if (file == NULL) {
5a15f70c	186	printk(KERN_WARNING "LTTng: Cannot access file backing the fd(%d)\n", fd);
56377c91 FD	187	inode = NULL;
	188	goto error;
	189	}
	190
	191	/* Grab a reference on the inode. */
	192	inode = igrab(file->f_path.dentry->d_inode);
	193	if (inode == NULL)
5a15f70c	194	printk(KERN_WARNING "LTTng: Cannot grab a reference on the inode.\n");
9f945e81	195
56377c91 FD	196	error:
56377c91 FD	197	rcu_read_unlock();
9f945e81 KS	198	if (file)
9f945e81 KS	199	fput(file);
56377c91 FD	200	return inode;
	201	}
	202
83b802dc FD	203
	204	static
	205	int lttng_uprobes_add_callsite(struct lttng_uprobe *uprobe,
606828e4	206	struct lttng_kernel_abi_event_callsite __user *callsite,
83b802dc FD	207	int (handler)(struct uprobe_consumer self, struct pt_regs *regs),
83b802dc FD	208	void *priv_data)
149b9a9d	209	{
3aed4dca FD	210	int ret = 0;
	211	struct lttng_uprobe_handler *uprobe_handler;
	212
83b802dc	213	if (!priv_data) {
3aed4dca FD	214	ret = -EINVAL;
	215	goto end;
	216	}
	217
	218	uprobe_handler = kzalloc(sizeof(struct lttng_uprobe_handler), GFP_KERNEL);
	219	if (!uprobe_handler) {
5a15f70c	220	printk(KERN_WARNING "LTTng: Error allocating uprobe_handler");
3aed4dca FD	221	ret = -ENOMEM;
	222	goto end;
	223	}
	224
196bfc6a	225	/* Ensure the memory we just allocated don't notify page faults. */
263b6c88	226	wrapper_vmalloc_sync_mappings();
3aed4dca	227
e2d5dbc7	228	uprobe_handler->event = priv_data;
83b802dc	229	uprobe_handler->up_consumer.handler = handler;
3aed4dca FD	230
	231	ret = copy_from_user(&uprobe_handler->offset, &callsite->u.uprobe.offset, sizeof(uint64_t));
	232	if (ret) {
	233	goto register_error;
	234	}
	235
83b802dc	236	ret = wrapper_uprobe_register(uprobe->inode,
3aed4dca FD	237	uprobe_handler->offset, &uprobe_handler->up_consumer);
3aed4dca FD	238	if (ret) {
5a15f70c	239	printk(KERN_WARNING "LTTng: Error registering probe on inode %lu "
83b802dc	240	"and offset 0x%llx\n", uprobe->inode->i_ino,
3aed4dca FD	241	uprobe_handler->offset);
	242	ret = -1;
	243	goto register_error;
	244	}
	245
83b802dc	246	list_add(&uprobe_handler->node, &uprobe->head);
3aed4dca FD	247
	248	return ret;
	249
	250	register_error:
	251	kfree(uprobe_handler);
	252	end:
	253	return ret;
	254	}
3aed4dca	255
e2d5dbc7	256	int lttng_uprobes_event_add_callsite(struct lttng_kernel_event_common *event,
606828e4	257	struct lttng_kernel_abi_event_callsite __user *callsite)
83b802dc	258	{
e2d5dbc7 MD	259	return lttng_uprobes_add_callsite(&event->priv->u.uprobe, callsite,
e2d5dbc7 MD	260	lttng_uprobes_event_handler_pre, event);
83b802dc FD	261	}
	262	EXPORT_SYMBOL_GPL(lttng_uprobes_event_add_callsite);
	263
	264	static
	265	int lttng_uprobes_register(struct lttng_uprobe *uprobe, int fd)
3aed4dca FD	266	{
3aed4dca FD	267	int ret = 0;
56377c91	268	struct inode *inode;
149b9a9d	269
56377c91 FD	270	inode = get_inode_from_fd(fd);
56377c91 FD	271	if (!inode) {
5a15f70c	272	printk(KERN_WARNING "LTTng: Cannot get inode from fd\n");
56377c91 FD	273	ret = -EBADF;
	274	goto inode_error;
	275	}
83b802dc FD	276	uprobe->inode = inode;
	277	INIT_LIST_HEAD(&uprobe->head);
	278
	279	inode_error:
	280	return ret;
	281	}
	282
a67ba386	283	int lttng_uprobes_register_event(const char name, int fd, struct lttng_kernel_event_recorder event_recorder)
83b802dc FD	284	{
	285	int ret = 0;
	286
a67ba386	287	ret = lttng_create_uprobe_event(name, event_recorder);
83b802dc FD	288	if (ret)
	289	goto error;
	290
a67ba386	291	ret = lttng_uprobes_register(&event_recorder->priv->parent.u.uprobe, fd);
83b802dc FD	292	if (ret)
83b802dc FD	293	goto register_error;
149b9a9d	294
149b9a9d YB	295	return 0;
149b9a9d YB	296
83b802dc	297	register_error:
a67ba386 MD	298	kfree(event_recorder->priv->parent.desc->event_name);
a67ba386 MD	299	kfree(event_recorder->priv->parent.desc);
149b9a9d YB	300	error:
	301	return ret;
	302	}
83b802dc	303	EXPORT_SYMBOL_GPL(lttng_uprobes_register_event);
149b9a9d	304
9de67196	305	int lttng_uprobes_register_event_notifier(const char *name, int fd,
a67ba386	306	struct lttng_kernel_event_notifier *event_notifier)
9de67196 FD	307	{
	308	int ret = 0;
	309
	310	ret = lttng_create_uprobe_event_notifier(name, event_notifier);
	311	if (ret)
	312	goto error;
	313
a67ba386	314	ret = lttng_uprobes_register(&event_notifier->priv->parent.u.uprobe, fd);
9de67196 FD	315	if (ret)
	316	goto register_error;
	317
	318	return 0;
	319
	320	register_error:
a67ba386 MD	321	kfree(event_notifier->priv->parent.desc->event_name);
a67ba386 MD	322	kfree(event_notifier->priv->parent.desc);
9de67196 FD	323	error:
	324	return ret;
	325	}
	326	EXPORT_SYMBOL_GPL(lttng_uprobes_register_event_notifier);
	327
	328	static
	329	void lttng_uprobes_unregister(struct inode inode, struct list_head head)
149b9a9d	330	{
3aed4dca FD	331	struct lttng_uprobe_handler iter, tmp;
	332
	333	/*
	334	* Iterate over the list of handler, remove each handler from the list
	335	* and free the struct.
	336	*/
9de67196 FD	337	list_for_each_entry_safe(iter, tmp, head, node) {
9de67196 FD	338	wrapper_uprobe_unregister(inode, iter->offset, &iter->up_consumer);
3aed4dca FD	339	list_del(&iter->node);
	340	kfree(iter);
	341	}
9de67196 FD	342	}
9de67196 FD	343
a67ba386	344	void lttng_uprobes_unregister_event(struct lttng_kernel_event_recorder *event_recorder)
9de67196	345	{
a67ba386	346	lttng_uprobes_unregister(event_recorder->priv->parent.u.uprobe.inode, &event_recorder->priv->parent.u.uprobe.head);
149b9a9d	347	}
83b802dc	348	EXPORT_SYMBOL_GPL(lttng_uprobes_unregister_event);
149b9a9d	349
a67ba386	350	void lttng_uprobes_unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
9de67196	351	{
a67ba386	352	lttng_uprobes_unregister(event_notifier->priv->parent.u.uprobe.inode, &event_notifier->priv->parent.u.uprobe.head);
9de67196 FD	353	}
	354	EXPORT_SYMBOL_GPL(lttng_uprobes_unregister_event_notifier);
	355
a67ba386	356	void lttng_uprobes_destroy_event_private(struct lttng_kernel_event_recorder *event_recorder)
149b9a9d	357	{
a67ba386	358	iput(event_recorder->priv->parent.u.uprobe.inode);
a67ba386 MD	359	kfree(event_recorder->priv->parent.desc->event_name);
a67ba386 MD	360	kfree(event_recorder->priv->parent.desc);
149b9a9d	361	}
83b802dc	362	EXPORT_SYMBOL_GPL(lttng_uprobes_destroy_event_private);
149b9a9d	363
a67ba386	364	void lttng_uprobes_destroy_event_notifier_private(struct lttng_kernel_event_notifier *event_notifier)
9de67196	365	{
a67ba386 MD	366	iput(event_notifier->priv->parent.u.uprobe.inode);
	367	kfree(event_notifier->priv->parent.desc->event_name);
	368	kfree(event_notifier->priv->parent.desc);
9de67196 FD	369	}
	370	EXPORT_SYMBOL_GPL(lttng_uprobes_destroy_event_notifier_private);
	371
149b9a9d YB	372	MODULE_LICENSE("GPL and additional rights");
	373	MODULE_AUTHOR("Yannick Brosseau");
	374	MODULE_DESCRIPTION("Linux Trace Toolkit Uprobes Support");