[lttng-modules.git] / tests / probes / lttng-test.c

/*
 * lttng-test.c
 *
 * Linux Trace Toolkit Next Generation Test Module
 *
 * Copyright 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * 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; only
 * version 2.1 of the License.
 *
 * 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
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/byteorder/generic.h>
#include <asm/byteorder.h>

#include <lttng-events.h>
#include <lttng-tracer.h>
#include <wrapper/tracepoint.h>
#include <wrapper/kstrtox.h>

#define TP_MODULE_NOAUTOLOAD
#define LTTNG_PACKAGE_BUILD
#define CREATE_TRACE_POINTS
#define TRACE_INCLUDE_PATH instrumentation/events/lttng-module
#define TRACE_INCLUDE_FILE lttng-test
#define LTTNG_INSTRUMENTATION
#include <instrumentation/events/lttng-module/lttng-test.h>

DEFINE_TRACE(lttng_test_filter_event);

#define LTTNG_TEST_FILTER_EVENT_FILE	"lttng-test-filter-event"

#define LTTNG_WRITE_COUNT_MAX	64

static struct proc_dir_entry *lttng_test_filter_event_dentry;

static
void trace_test_event(unsigned int nr_iter)
{
	int i, netint;
	long values[] = { 1, 2, 3 };
	uint32_t net_values[] = { 1, 2, 3 };
	char text[10] = "test";
	char escape[10] = "\\*";

	for (i = 0; i < 3; i++) {
		net_values[i] = htonl(net_values[i]);
	}
	for (i = 0; i < nr_iter; i++) {
		netint = htonl(i);
		trace_lttng_test_filter_event(i, netint, values, text, strlen(text), escape, net_values);
	}
}

/**
 * lttng_filter_event_write - trigger a lttng_test_filter_event
 * @file: file pointer
 * @user_buf: user string
 * @count: length to copy
 *
 * Return -1 on error, with EFAULT errno. Returns count on success.
 */
static
ssize_t lttng_test_filter_event_write(struct file *file, const char __user *user_buf,
		    size_t count, loff_t *ppos)
{
	unsigned int nr_iter;
	ssize_t written;
	int ret;

	/* Get the number of iterations */
	ret = lttng_kstrtouint_from_user(user_buf, count, 10, &nr_iter);
	if (ret) {
		written = ret;
		goto end;
	}
	/* Trace the event */
	trace_test_event(nr_iter);
	written = count;
	*ppos += written;
end:
	return written;
}

static const struct file_operations lttng_test_filter_event_operations = {
	.write = lttng_test_filter_event_write,
};

static
int __init lttng_test_init(void)
{
	int ret = 0;

	(void) wrapper_lttng_fixup_sig(THIS_MODULE);
	wrapper_vmalloc_sync_all();
	lttng_test_filter_event_dentry =
			proc_create_data(LTTNG_TEST_FILTER_EVENT_FILE,
				S_IRUGO | S_IWUGO, NULL,
				&lttng_test_filter_event_operations, NULL);
	if (!lttng_test_filter_event_dentry) {
		printk(KERN_ERR "Error creating LTTng test filter file\n");
		ret = -ENOMEM;
		goto error;
	}
	ret = __lttng_events_init__lttng_test();
	if (ret)
		goto error_events;
	return ret;

error_events:
	remove_proc_entry(LTTNG_TEST_FILTER_EVENT_FILE, NULL);
error:
	return ret;
}

module_init(lttng_test_init);

static
void __exit lttng_test_exit(void)
{
	__lttng_events_exit__lttng_test();
	if (lttng_test_filter_event_dentry)
		remove_proc_entry(LTTNG_TEST_FILTER_EVENT_FILE, NULL);
}

module_exit(lttng_test_exit);

MODULE_LICENSE("GPL and additional rights");
MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
MODULE_DESCRIPTION("LTTng Test");
MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
	__stringify(LTTNG_MODULES_MINOR_VERSION) "."
	__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
	LTTNG_MODULES_EXTRAVERSION);
Commit	Line	Data
89406ecd MD	1	/*
	2	* lttng-test.c
	3	*
	4	* Linux Trace Toolkit Next Generation Test Module
	5	*
	6	* Copyright 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	7	*
	8	* This library is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
	10	* License as published by the Free Software Foundation; only
	11	* version 2.1 of the License.
	12	*
	13	* This library is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public
	19	* License along with this library; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
	23	#include <linux/init.h>
	24	#include <linux/module.h>
	25	#include <linux/proc_fs.h>
	26	#include <linux/byteorder/generic.h>
3834b99f	27	#include <asm/byteorder.h>
89406ecd	28
156a3977 MD	29	#include <lttng-events.h>
	30	#include <lttng-tracer.h>
	31	#include <wrapper/tracepoint.h>
	32	#include <wrapper/kstrtox.h>
89406ecd MD	33
	34	#define TP_MODULE_NOAUTOLOAD
	35	#define LTTNG_PACKAGE_BUILD
	36	#define CREATE_TRACE_POINTS
156a3977	37	#define TRACE_INCLUDE_PATH instrumentation/events/lttng-module
89406ecd MD	38	#define TRACE_INCLUDE_FILE lttng-test
89406ecd MD	39	#define LTTNG_INSTRUMENTATION
156a3977	40	#include <instrumentation/events/lttng-module/lttng-test.h>
89406ecd MD	41
	42	DEFINE_TRACE(lttng_test_filter_event);
	43
	44	#define LTTNG_TEST_FILTER_EVENT_FILE "lttng-test-filter-event"
	45
	46	#define LTTNG_WRITE_COUNT_MAX 64
	47
	48	static struct proc_dir_entry *lttng_test_filter_event_dentry;
	49
	50	static
	51	void trace_test_event(unsigned int nr_iter)
	52	{
	53	int i, netint;
	54	long values[] = { 1, 2, 3 };
3834b99f	55	uint32_t net_values[] = { 1, 2, 3 };
89406ecd MD	56	char text[10] = "test";
	57	char escape[10] = "\\*";
	58
3834b99f MD	59	for (i = 0; i < 3; i++) {
	60	net_values[i] = htonl(net_values[i]);
	61	}
89406ecd MD	62	for (i = 0; i < nr_iter; i++) {
89406ecd MD	63	netint = htonl(i);
3834b99f	64	trace_lttng_test_filter_event(i, netint, values, text, strlen(text), escape, net_values);
89406ecd MD	65	}
	66	}
	67
	68	/**
	69	* lttng_filter_event_write - trigger a lttng_test_filter_event
	70	* @file: file pointer
	71	* @user_buf: user string
	72	* @count: length to copy
	73	*
	74	* Return -1 on error, with EFAULT errno. Returns count on success.
	75	*/
	76	static
	77	ssize_t lttng_test_filter_event_write(struct file file, const char __user user_buf,
	78	size_t count, loff_t *ppos)
	79	{
	80	unsigned int nr_iter;
	81	ssize_t written;
	82	int ret;
	83
	84	/* Get the number of iterations */
5a18f28d	85	ret = lttng_kstrtouint_from_user(user_buf, count, 10, &nr_iter);
89406ecd MD	86	if (ret) {
	87	written = ret;
	88	goto end;
	89	}
	90	/* Trace the event */
	91	trace_test_event(nr_iter);
	92	written = count;
	93	*ppos += written;
	94	end:
	95	return written;
	96	}
	97
	98	static const struct file_operations lttng_test_filter_event_operations = {
	99	.write = lttng_test_filter_event_write,
	100	};
	101
	102	static
	103	int __init lttng_test_init(void)
	104	{
	105	int ret = 0;
	106
	107	(void) wrapper_lttng_fixup_sig(THIS_MODULE);
	108	wrapper_vmalloc_sync_all();
	109	lttng_test_filter_event_dentry =
	110	proc_create_data(LTTNG_TEST_FILTER_EVENT_FILE,
	111	S_IRUGO \| S_IWUGO, NULL,
	112	&lttng_test_filter_event_operations, NULL);
	113	if (!lttng_test_filter_event_dentry) {
	114	printk(KERN_ERR "Error creating LTTng test filter file\n");
	115	ret = -ENOMEM;
	116	goto error;
	117	}
	118	ret = __lttng_events_init__lttng_test();
	119	if (ret)
	120	goto error_events;
	121	return ret;
	122
	123	error_events:
	124	remove_proc_entry(LTTNG_TEST_FILTER_EVENT_FILE, NULL);
	125	error:
	126	return ret;
	127	}
	128
	129	module_init(lttng_test_init);
	130
	131	static
	132	void __exit lttng_test_exit(void)
	133	{
	134	__lttng_events_exit__lttng_test();
	135	if (lttng_test_filter_event_dentry)
	136	remove_proc_entry(LTTNG_TEST_FILTER_EVENT_FILE, NULL);
	137	}
	138
	139	module_exit(lttng_test_exit);
	140
	141	MODULE_LICENSE("GPL and additional rights");
	142	MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
	143	MODULE_DESCRIPTION("LTTng Test");
	144	MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
	145	__stringify(LTTNG_MODULES_MINOR_VERSION) "."
	146	__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
	147	LTTNG_MODULES_EXTRAVERSION);