[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/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_channel *chan = event_recorder->chan;

		if (unlikely(!LTTNG_READ_ONCE(chan->session->active)))
			return 0;
		if (unlikely(!LTTNG_READ_ONCE(chan->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_channel *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);

		lib_ring_buffer_align_ctx(&ctx, lttng_alignof(payload));
		chan->ops->event_write(&ctx, &payload, sizeof(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, 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_fd_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();
	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>
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	18	#include <lttng/events.h>
a67ba386	19	#include <lttng/events-internal.h>
2df37e95	20	#include <lttng/tracer.h>
149b9a9d	21	#include <wrapper/irqflags.h>
24591303	22	#include <ringbuffer/frontend_types.h>
149b9a9d YB	23	#include <wrapper/uprobes.h>
	24	#include <wrapper/vmalloc.h>
	25
	26	static
83b802dc	27	int lttng_uprobes_event_handler_pre(struct uprobe_consumer uc, struct pt_regs regs)
149b9a9d	28	{
3aed4dca FD	29	struct lttng_uprobe_handler *uprobe_handler =
3aed4dca FD	30	container_of(uc, struct lttng_uprobe_handler, up_consumer);
e2d5dbc7	31	struct lttng_kernel_event_common *event = uprobe_handler->event;
a92e844e	32	struct lttng_kernel_probe_ctx lttng_probe_ctx = {
e2d5dbc7	33	.event = event,
149b9a9d YB	34	.interruptible = !lttng_regs_irqs_disabled(regs),
149b9a9d YB	35	};
149b9a9d YB	36	struct {
149b9a9d YB	37	unsigned long ip;
56377c91	38	} payload;
149b9a9d	39
e2d5dbc7 MD	40	switch (event->type) {
	41	case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
	42	{
	43	struct lttng_kernel_event_recorder *event_recorder =
	44	container_of(event, struct lttng_kernel_event_recorder, parent);
	45	struct lttng_channel *chan = event_recorder->chan;
	46
	47	if (unlikely(!LTTNG_READ_ONCE(chan->session->active)))
	48	return 0;
	49	if (unlikely(!LTTNG_READ_ONCE(chan->enabled)))
	50	return 0;
	51	break;
	52	}
	53	case LTTNG_KERNEL_EVENT_TYPE_NOTIFIER:
	54	break;
	55	default:
	56	WARN_ON_ONCE(1);
	57	}
9de67196	58
e2d5dbc7	59	if (unlikely(!LTTNG_READ_ONCE(event->enabled)))
9de67196 FD	60	return 0;
9de67196 FD	61
e2d5dbc7 MD	62	switch (event->type) {
	63	case LTTNG_KERNEL_EVENT_TYPE_RECORDER:
	64	{
	65	struct lttng_kernel_event_recorder *event_recorder =
	66	container_of(event, struct lttng_kernel_event_recorder, parent);
	67	struct lttng_channel *chan = event_recorder->chan;
8a57ec02	68	struct lttng_kernel_ring_buffer_ctx ctx;
e2d5dbc7 MD	69	int ret;
e2d5dbc7 MD	70
b1199bd3 MD	71	lib_ring_buffer_ctx_init(&ctx, event_recorder,
b1199bd3 MD	72	sizeof(payload), lttng_alignof(payload), &lttng_probe_ctx);
e2d5dbc7	73
c2fb9c1c	74	ret = chan->ops->event_reserve(&ctx);
e2d5dbc7 MD	75	if (ret < 0)
	76	return 0;
	77
	78	/* Event payload. */
	79	payload.ip = (unsigned long)instruction_pointer(regs);
	80
	81	lib_ring_buffer_align_ctx(&ctx, lttng_alignof(payload));
	82	chan->ops->event_write(&ctx, &payload, sizeof(payload));
	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
6c8c025b 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),
	105	false, false, false),
	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;
6c8c025b	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;
6c8c025b	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	*/
0aebcd68	184	file = lttng_lookup_fd_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");
56377c91 FD	195	error:
	196	rcu_read_unlock();
	197	return inode;
	198	}
	199
83b802dc FD	200
	201	static
	202	int lttng_uprobes_add_callsite(struct lttng_uprobe *uprobe,
606828e4	203	struct lttng_kernel_abi_event_callsite __user *callsite,
83b802dc FD	204	int (handler)(struct uprobe_consumer self, struct pt_regs *regs),
83b802dc FD	205	void *priv_data)
149b9a9d	206	{
3aed4dca FD	207	int ret = 0;
	208	struct lttng_uprobe_handler *uprobe_handler;
	209
83b802dc	210	if (!priv_data) {
3aed4dca FD	211	ret = -EINVAL;
	212	goto end;
	213	}
	214
	215	uprobe_handler = kzalloc(sizeof(struct lttng_uprobe_handler), GFP_KERNEL);
	216	if (!uprobe_handler) {
5a15f70c	217	printk(KERN_WARNING "LTTng: Error allocating uprobe_handler");
3aed4dca FD	218	ret = -ENOMEM;
	219	goto end;
	220	}
	221
196bfc6a	222	/* Ensure the memory we just allocated don't notify page faults. */
263b6c88	223	wrapper_vmalloc_sync_mappings();
3aed4dca	224
e2d5dbc7	225	uprobe_handler->event = priv_data;
83b802dc	226	uprobe_handler->up_consumer.handler = handler;
3aed4dca FD	227
	228	ret = copy_from_user(&uprobe_handler->offset, &callsite->u.uprobe.offset, sizeof(uint64_t));
	229	if (ret) {
	230	goto register_error;
	231	}
	232
83b802dc	233	ret = wrapper_uprobe_register(uprobe->inode,
3aed4dca FD	234	uprobe_handler->offset, &uprobe_handler->up_consumer);
3aed4dca FD	235	if (ret) {
5a15f70c	236	printk(KERN_WARNING "LTTng: Error registering probe on inode %lu "
83b802dc	237	"and offset 0x%llx\n", uprobe->inode->i_ino,
3aed4dca FD	238	uprobe_handler->offset);
	239	ret = -1;
	240	goto register_error;
	241	}
	242
83b802dc	243	list_add(&uprobe_handler->node, &uprobe->head);
3aed4dca FD	244
	245	return ret;
	246
	247	register_error:
	248	kfree(uprobe_handler);
	249	end:
	250	return ret;
	251	}
3aed4dca	252
e2d5dbc7	253	int lttng_uprobes_event_add_callsite(struct lttng_kernel_event_common *event,
606828e4	254	struct lttng_kernel_abi_event_callsite __user *callsite)
83b802dc	255	{
e2d5dbc7 MD	256	return lttng_uprobes_add_callsite(&event->priv->u.uprobe, callsite,
e2d5dbc7 MD	257	lttng_uprobes_event_handler_pre, event);
83b802dc FD	258	}
	259	EXPORT_SYMBOL_GPL(lttng_uprobes_event_add_callsite);
	260
	261	static
	262	int lttng_uprobes_register(struct lttng_uprobe *uprobe, int fd)
3aed4dca FD	263	{
3aed4dca FD	264	int ret = 0;
56377c91	265	struct inode *inode;
149b9a9d	266
56377c91 FD	267	inode = get_inode_from_fd(fd);
56377c91 FD	268	if (!inode) {
5a15f70c	269	printk(KERN_WARNING "LTTng: Cannot get inode from fd\n");
56377c91 FD	270	ret = -EBADF;
	271	goto inode_error;
	272	}
83b802dc FD	273	uprobe->inode = inode;
	274	INIT_LIST_HEAD(&uprobe->head);
	275
	276	inode_error:
	277	return ret;
	278	}
	279
a67ba386	280	int lttng_uprobes_register_event(const char name, int fd, struct lttng_kernel_event_recorder event_recorder)
83b802dc FD	281	{
	282	int ret = 0;
	283
a67ba386	284	ret = lttng_create_uprobe_event(name, event_recorder);
83b802dc FD	285	if (ret)
	286	goto error;
	287
a67ba386	288	ret = lttng_uprobes_register(&event_recorder->priv->parent.u.uprobe, fd);
83b802dc FD	289	if (ret)
83b802dc FD	290	goto register_error;
149b9a9d	291
149b9a9d YB	292	return 0;
149b9a9d YB	293
83b802dc	294	register_error:
a67ba386 MD	295	kfree(event_recorder->priv->parent.desc->event_name);
a67ba386 MD	296	kfree(event_recorder->priv->parent.desc);
149b9a9d YB	297	error:
	298	return ret;
	299	}
83b802dc	300	EXPORT_SYMBOL_GPL(lttng_uprobes_register_event);
149b9a9d	301
9de67196	302	int lttng_uprobes_register_event_notifier(const char *name, int fd,
a67ba386	303	struct lttng_kernel_event_notifier *event_notifier)
9de67196 FD	304	{
	305	int ret = 0;
	306
	307	ret = lttng_create_uprobe_event_notifier(name, event_notifier);
	308	if (ret)
	309	goto error;
	310
a67ba386	311	ret = lttng_uprobes_register(&event_notifier->priv->parent.u.uprobe, fd);
9de67196 FD	312	if (ret)
	313	goto register_error;
	314
	315	return 0;
	316
	317	register_error:
a67ba386 MD	318	kfree(event_notifier->priv->parent.desc->event_name);
a67ba386 MD	319	kfree(event_notifier->priv->parent.desc);
9de67196 FD	320	error:
	321	return ret;
	322	}
	323	EXPORT_SYMBOL_GPL(lttng_uprobes_register_event_notifier);
	324
	325	static
	326	void lttng_uprobes_unregister(struct inode inode, struct list_head head)
149b9a9d	327	{
3aed4dca FD	328	struct lttng_uprobe_handler iter, tmp;
	329
	330	/*
	331	* Iterate over the list of handler, remove each handler from the list
	332	* and free the struct.
	333	*/
9de67196 FD	334	list_for_each_entry_safe(iter, tmp, head, node) {
9de67196 FD	335	wrapper_uprobe_unregister(inode, iter->offset, &iter->up_consumer);
3aed4dca FD	336	list_del(&iter->node);
	337	kfree(iter);
	338	}
9de67196 FD	339	}
9de67196 FD	340
a67ba386	341	void lttng_uprobes_unregister_event(struct lttng_kernel_event_recorder *event_recorder)
9de67196	342	{
a67ba386	343	lttng_uprobes_unregister(event_recorder->priv->parent.u.uprobe.inode, &event_recorder->priv->parent.u.uprobe.head);
149b9a9d	344	}
83b802dc	345	EXPORT_SYMBOL_GPL(lttng_uprobes_unregister_event);
149b9a9d	346
a67ba386	347	void lttng_uprobes_unregister_event_notifier(struct lttng_kernel_event_notifier *event_notifier)
9de67196	348	{
a67ba386	349	lttng_uprobes_unregister(event_notifier->priv->parent.u.uprobe.inode, &event_notifier->priv->parent.u.uprobe.head);
9de67196 FD	350	}
	351	EXPORT_SYMBOL_GPL(lttng_uprobes_unregister_event_notifier);
	352
a67ba386	353	void lttng_uprobes_destroy_event_private(struct lttng_kernel_event_recorder *event_recorder)
149b9a9d	354	{
a67ba386	355	iput(event_recorder->priv->parent.u.uprobe.inode);
a67ba386 MD	356	kfree(event_recorder->priv->parent.desc->event_name);
a67ba386 MD	357	kfree(event_recorder->priv->parent.desc);
149b9a9d	358	}
83b802dc	359	EXPORT_SYMBOL_GPL(lttng_uprobes_destroy_event_private);
149b9a9d	360
a67ba386	361	void lttng_uprobes_destroy_event_notifier_private(struct lttng_kernel_event_notifier *event_notifier)
9de67196	362	{
a67ba386 MD	363	iput(event_notifier->priv->parent.u.uprobe.inode);
	364	kfree(event_notifier->priv->parent.desc->event_name);
	365	kfree(event_notifier->priv->parent.desc);
9de67196 FD	366	}
	367	EXPORT_SYMBOL_GPL(lttng_uprobes_destroy_event_notifier_private);
	368
149b9a9d YB	369	MODULE_LICENSE("GPL and additional rights");
	370	MODULE_AUTHOR("Yannick Brosseau");
	371	MODULE_DESCRIPTION("Linux Trace Toolkit Uprobes Support");