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

/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
 *
 * lttng-test.c
 *
 * Linux Trace Toolkit Next Generation Test Module
 *
 * Copyright 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 */

#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>

#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 = 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;
}

#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
static const struct proc_ops lttng_test_filter_event_proc_ops = {
	.proc_write = lttng_test_filter_event_write,
};
#else
static const struct file_operations lttng_test_filter_event_proc_ops = {
	.write = lttng_test_filter_event_write,
};
#endif

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

	(void) wrapper_lttng_fixup_sig(THIS_MODULE);
	wrapper_vmalloc_sync_mappings();
	lttng_test_filter_event_dentry =
			proc_create_data(LTTNG_TEST_FILTER_EVENT_FILE,
				S_IRUGO | S_IWUGO, NULL,
				&lttng_test_filter_event_proc_ops, 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
9f36eaed MJ	1	/* SPDX-License-Identifier: (GPL-2.0 or LGPL-2.1)
9f36eaed MJ	2	*
89406ecd MD	3	* lttng-test.c
	4	*
	5	* Linux Trace Toolkit Next Generation Test Module
	6	*
	7	* Copyright 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
89406ecd MD	8	*/
	9
	10	#include <linux/init.h>
	11	#include <linux/module.h>
	12	#include <linux/proc_fs.h>
	13	#include <linux/byteorder/generic.h>
3834b99f	14	#include <asm/byteorder.h>
89406ecd	15
156a3977 MD	16	#include <lttng-events.h>
	17	#include <lttng-tracer.h>
	18	#include <wrapper/tracepoint.h>
89406ecd MD	19
	20	#define TP_MODULE_NOAUTOLOAD
	21	#define LTTNG_PACKAGE_BUILD
	22	#define CREATE_TRACE_POINTS
156a3977	23	#define TRACE_INCLUDE_PATH instrumentation/events/lttng-module
89406ecd MD	24	#define TRACE_INCLUDE_FILE lttng-test
89406ecd MD	25	#define LTTNG_INSTRUMENTATION
156a3977	26	#include <instrumentation/events/lttng-module/lttng-test.h>
89406ecd MD	27
	28	DEFINE_TRACE(lttng_test_filter_event);
	29
	30	#define LTTNG_TEST_FILTER_EVENT_FILE "lttng-test-filter-event"
	31
	32	#define LTTNG_WRITE_COUNT_MAX 64
	33
	34	static struct proc_dir_entry *lttng_test_filter_event_dentry;
	35
	36	static
	37	void trace_test_event(unsigned int nr_iter)
	38	{
	39	int i, netint;
	40	long values[] = { 1, 2, 3 };
3834b99f	41	uint32_t net_values[] = { 1, 2, 3 };
89406ecd MD	42	char text[10] = "test";
	43	char escape[10] = "\\*";
	44
3834b99f MD	45	for (i = 0; i < 3; i++) {
	46	net_values[i] = htonl(net_values[i]);
	47	}
89406ecd MD	48	for (i = 0; i < nr_iter; i++) {
89406ecd MD	49	netint = htonl(i);
3834b99f	50	trace_lttng_test_filter_event(i, netint, values, text, strlen(text), escape, net_values);
89406ecd MD	51	}
	52	}
	53
	54	/**
	55	* lttng_filter_event_write - trigger a lttng_test_filter_event
	56	* @file: file pointer
	57	* @user_buf: user string
	58	* @count: length to copy
	59	*
	60	* Return -1 on error, with EFAULT errno. Returns count on success.
	61	*/
	62	static
	63	ssize_t lttng_test_filter_event_write(struct file file, const char __user user_buf,
	64	size_t count, loff_t *ppos)
	65	{
	66	unsigned int nr_iter;
	67	ssize_t written;
	68	int ret;
	69
	70	/* Get the number of iterations */
1a9417ef	71	ret = kstrtouint_from_user(user_buf, count, 10, &nr_iter);
89406ecd MD	72	if (ret) {
	73	written = ret;
	74	goto end;
	75	}
	76	/* Trace the event */
	77	trace_test_event(nr_iter);
	78	written = count;
	79	*ppos += written;
	80	end:
	81	return written;
	82	}
	83
122ba89c MJ	84	#if (LINUX_VERSION_CODE >= KERNEL_VERSION(5,6,0))
	85	static const struct proc_ops lttng_test_filter_event_proc_ops = {
	86	.proc_write = lttng_test_filter_event_write,
	87	};
	88	#else
	89	static const struct file_operations lttng_test_filter_event_proc_ops = {
89406ecd MD	90	.write = lttng_test_filter_event_write,
89406ecd MD	91	};
122ba89c	92	#endif
89406ecd MD	93
	94	static
	95	int __init lttng_test_init(void)
	96	{
	97	int ret = 0;
	98
	99	(void) wrapper_lttng_fixup_sig(THIS_MODULE);
ea53823c	100	wrapper_vmalloc_sync_mappings();
89406ecd MD	101	lttng_test_filter_event_dentry =
	102	proc_create_data(LTTNG_TEST_FILTER_EVENT_FILE,
	103	S_IRUGO \| S_IWUGO, NULL,
122ba89c	104	&lttng_test_filter_event_proc_ops, NULL);
89406ecd MD	105	if (!lttng_test_filter_event_dentry) {
	106	printk(KERN_ERR "Error creating LTTng test filter file\n");
	107	ret = -ENOMEM;
	108	goto error;
	109	}
	110	ret = __lttng_events_init__lttng_test();
	111	if (ret)
	112	goto error_events;
	113	return ret;
	114
	115	error_events:
	116	remove_proc_entry(LTTNG_TEST_FILTER_EVENT_FILE, NULL);
	117	error:
	118	return ret;
	119	}
	120
	121	module_init(lttng_test_init);
	122
	123	static
	124	void __exit lttng_test_exit(void)
	125	{
	126	__lttng_events_exit__lttng_test();
	127	if (lttng_test_filter_event_dentry)
	128	remove_proc_entry(LTTNG_TEST_FILTER_EVENT_FILE, NULL);
	129	}
	130
	131	module_exit(lttng_test_exit);
	132
	133	MODULE_LICENSE("GPL and additional rights");
	134	MODULE_AUTHOR("Mathieu Desnoyers <mathieu.desnoyers@efficios.com>");
	135	MODULE_DESCRIPTION("LTTng Test");
	136	MODULE_VERSION(__stringify(LTTNG_MODULES_MAJOR_VERSION) "."
	137	__stringify(LTTNG_MODULES_MINOR_VERSION) "."
	138	__stringify(LTTNG_MODULES_PATCHLEVEL_VERSION)
	139	LTTNG_MODULES_EXTRAVERSION);