[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / rtmutex-tester.c

/*
 * RT-Mutex-tester: scriptable tester for rt mutexes
 *
 * started by Thomas Gleixner:
 *
 *  Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
 *
 */
#include <linux/config.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <linux/spinlock.h>
#include <linux/sysdev.h>
#include <linux/timer.h>

#include "rtmutex.h"

#define MAX_RT_TEST_THREADS	8
#define MAX_RT_TEST_MUTEXES	8

static spinlock_t rttest_lock;
static atomic_t rttest_event;

struct test_thread_data {
	int			opcode;
	int			opdata;
	int			mutexes[MAX_RT_TEST_MUTEXES];
	int			bkl;
	int			event;
	struct sys_device	sysdev;
};

static struct test_thread_data thread_data[MAX_RT_TEST_THREADS];
static struct task_struct *threads[MAX_RT_TEST_THREADS];
static struct rt_mutex mutexes[MAX_RT_TEST_MUTEXES];

enum test_opcodes {
	RTTEST_NOP = 0,
	RTTEST_SCHEDOT,		/* 1 Sched other, data = nice */
	RTTEST_SCHEDRT,		/* 2 Sched fifo, data = prio */
	RTTEST_LOCK,		/* 3 Lock uninterruptible, data = lockindex */
	RTTEST_LOCKNOWAIT,	/* 4 Lock uninterruptible no wait in wakeup, data = lockindex */
	RTTEST_LOCKINT,		/* 5 Lock interruptible, data = lockindex */
	RTTEST_LOCKINTNOWAIT,	/* 6 Lock interruptible no wait in wakeup, data = lockindex */
	RTTEST_LOCKCONT,	/* 7 Continue locking after the wakeup delay */
	RTTEST_UNLOCK,		/* 8 Unlock, data = lockindex */
	RTTEST_LOCKBKL,		/* 9 Lock BKL */
	RTTEST_UNLOCKBKL,	/* 10 Unlock BKL */
	RTTEST_SIGNAL,		/* 11 Signal other test thread, data = thread id */
	RTTEST_RESETEVENT = 98,	/* 98 Reset event counter */
	RTTEST_RESET = 99,	/* 99 Reset all pending operations */
};

static int handle_op(struct test_thread_data *td, int lockwakeup)
{
	int i, id, ret = -EINVAL;

	switch(td->opcode) {

	case RTTEST_NOP:
		return 0;

	case RTTEST_LOCKCONT:
		td->mutexes[td->opdata] = 1;
		td->event = atomic_add_return(1, &rttest_event);
		return 0;

	case RTTEST_RESET:
		for (i = 0; i < MAX_RT_TEST_MUTEXES; i++) {
			if (td->mutexes[i] == 4) {
				rt_mutex_unlock(&mutexes[i]);
				td->mutexes[i] = 0;
			}
		}

		if (!lockwakeup && td->bkl == 4) {
			unlock_kernel();
			td->bkl = 0;
		}
		return 0;

	case RTTEST_RESETEVENT:
		atomic_set(&rttest_event, 0);
		return 0;

	default:
		if (lockwakeup)
			return ret;
	}

	switch(td->opcode) {

	case RTTEST_LOCK:
	case RTTEST_LOCKNOWAIT:
		id = td->opdata;
		if (id < 0 || id >= MAX_RT_TEST_MUTEXES)
			return ret;

		td->mutexes[id] = 1;
		td->event = atomic_add_return(1, &rttest_event);
		rt_mutex_lock(&mutexes[id]);
		td->event = atomic_add_return(1, &rttest_event);
		td->mutexes[id] = 4;
		return 0;

	case RTTEST_LOCKINT:
	case RTTEST_LOCKINTNOWAIT:
		id = td->opdata;
		if (id < 0 || id >= MAX_RT_TEST_MUTEXES)
			return ret;

		td->mutexes[id] = 1;
		td->event = atomic_add_return(1, &rttest_event);
		ret = rt_mutex_lock_interruptible(&mutexes[id], 0);
		td->event = atomic_add_return(1, &rttest_event);
		td->mutexes[id] = ret ? 0 : 4;
		return ret ? -EINTR : 0;

	case RTTEST_UNLOCK:
		id = td->opdata;
		if (id < 0 || id >= MAX_RT_TEST_MUTEXES || td->mutexes[id] != 4)
			return ret;

		td->event = atomic_add_return(1, &rttest_event);
		rt_mutex_unlock(&mutexes[id]);
		td->event = atomic_add_return(1, &rttest_event);
		td->mutexes[id] = 0;
		return 0;

	case RTTEST_LOCKBKL:
		if (td->bkl)
			return 0;
		td->bkl = 1;
		lock_kernel();
		td->bkl = 4;
		return 0;

	case RTTEST_UNLOCKBKL:
		if (td->bkl != 4)
			break;
		unlock_kernel();
		td->bkl = 0;
		return 0;

	default:
		break;
	}
	return ret;
}

/*
 * Schedule replacement for rtsem_down(). Only called for threads with
 * PF_MUTEX_TESTER set.
 *
 * This allows us to have finegrained control over the event flow.
 *
 */
void schedule_rt_mutex_test(struct rt_mutex *mutex)
{
	int tid, op, dat;
	struct test_thread_data *td;

	/* We have to lookup the task */
	for (tid = 0; tid < MAX_RT_TEST_THREADS; tid++) {
		if (threads[tid] == current)
			break;
	}

	BUG_ON(tid == MAX_RT_TEST_THREADS);

	td = &thread_data[tid];

	op = td->opcode;
	dat = td->opdata;

	switch (op) {
	case RTTEST_LOCK:
	case RTTEST_LOCKINT:
	case RTTEST_LOCKNOWAIT:
	case RTTEST_LOCKINTNOWAIT:
		if (mutex != &mutexes[dat])
			break;

		if (td->mutexes[dat] != 1)
			break;

		td->mutexes[dat] = 2;
		td->event = atomic_add_return(1, &rttest_event);
		break;

	case RTTEST_LOCKBKL:
	default:
		break;
	}

	schedule();


	switch (op) {
	case RTTEST_LOCK:
	case RTTEST_LOCKINT:
		if (mutex != &mutexes[dat])
			return;

		if (td->mutexes[dat] != 2)
			return;

		td->mutexes[dat] = 3;
		td->event = atomic_add_return(1, &rttest_event);
		break;

	case RTTEST_LOCKNOWAIT:
	case RTTEST_LOCKINTNOWAIT:
		if (mutex != &mutexes[dat])
			return;

		if (td->mutexes[dat] != 2)
			return;

		td->mutexes[dat] = 1;
		td->event = atomic_add_return(1, &rttest_event);
		return;

	case RTTEST_LOCKBKL:
		return;
	default:
		return;
	}

	td->opcode = 0;

	for (;;) {
		set_current_state(TASK_INTERRUPTIBLE);

		if (td->opcode > 0) {
			int ret;

			set_current_state(TASK_RUNNING);
			ret = handle_op(td, 1);
			set_current_state(TASK_INTERRUPTIBLE);
			if (td->opcode == RTTEST_LOCKCONT)
				break;
			td->opcode = ret;
		}

		/* Wait for the next command to be executed */
		schedule();
	}

	/* Restore previous command and data */
	td->opcode = op;
	td->opdata = dat;
}

static int test_func(void *data)
{
	struct test_thread_data *td = data;
	int ret;

	current->flags |= PF_MUTEX_TESTER;
	allow_signal(SIGHUP);

	for(;;) {

		set_current_state(TASK_INTERRUPTIBLE);

		if (td->opcode > 0) {
			set_current_state(TASK_RUNNING);
			ret = handle_op(td, 0);
			set_current_state(TASK_INTERRUPTIBLE);
			td->opcode = ret;
		}

		/* Wait for the next command to be executed */
		schedule();

		if (signal_pending(current))
			flush_signals(current);

		if(kthread_should_stop())
			break;
	}
	return 0;
}

/**
 * sysfs_test_command - interface for test commands
 * @dev:	thread reference
 * @buf:	command for actual step
 * @count:	length of buffer
 *
 * command syntax:
 *
 * opcode:data
 */
static ssize_t sysfs_test_command(struct sys_device *dev, const char *buf,
				  size_t count)
{
	struct sched_param schedpar;
	struct test_thread_data *td;
	char cmdbuf[32];
	int op, dat, tid, ret;

	td = container_of(dev, struct test_thread_data, sysdev);
	tid = td->sysdev.id;

	/* strings from sysfs write are not 0 terminated! */
	if (count >= sizeof(cmdbuf))
		return -EINVAL;

	/* strip of \n: */
	if (buf[count-1] == '\n')
		count--;
	if (count < 1)
		return -EINVAL;

	memcpy(cmdbuf, buf, count);
	cmdbuf[count] = 0;

	if (sscanf(cmdbuf, "%d:%d", &op, &dat) != 2)
		return -EINVAL;

	switch (op) {
	case RTTEST_SCHEDOT:
		schedpar.sched_priority = 0;
		ret = sched_setscheduler(threads[tid], SCHED_NORMAL, &schedpar);
		if (ret)
			return ret;
		set_user_nice(current, 0);
		break;

	case RTTEST_SCHEDRT:
		schedpar.sched_priority = dat;
		ret = sched_setscheduler(threads[tid], SCHED_FIFO, &schedpar);
		if (ret)
			return ret;
		break;

	case RTTEST_SIGNAL:
		send_sig(SIGHUP, threads[tid], 0);
		break;

	default:
		if (td->opcode > 0)
			return -EBUSY;
		td->opdata = dat;
		td->opcode = op;
		wake_up_process(threads[tid]);
	}

	return count;
}

/**
 * sysfs_test_status - sysfs interface for rt tester
 * @dev:	thread to query
 * @buf:	char buffer to be filled with thread status info
 */
static ssize_t sysfs_test_status(struct sys_device *dev, char *buf)
{
	struct test_thread_data *td;
	struct task_struct *tsk;
	char *curr = buf;
	int i;

	td = container_of(dev, struct test_thread_data, sysdev);
	tsk = threads[td->sysdev.id];

	spin_lock(&rttest_lock);

	curr += sprintf(curr,
		"O: %4d, E:%8d, S: 0x%08lx, P: %4d, N: %4d, B: %p, K: %d, M:",
		td->opcode, td->event, tsk->state,
			(MAX_RT_PRIO - 1) - tsk->prio,
			(MAX_RT_PRIO - 1) - tsk->normal_prio,
		tsk->pi_blocked_on, td->bkl);

	for (i = MAX_RT_TEST_MUTEXES - 1; i >=0 ; i--)
		curr += sprintf(curr, "%d", td->mutexes[i]);

	spin_unlock(&rttest_lock);

	curr += sprintf(curr, ", T: %p, R: %p\n", tsk,
			mutexes[td->sysdev.id].owner);

	return curr - buf;
}

static SYSDEV_ATTR(status, 0600, sysfs_test_status, NULL);
static SYSDEV_ATTR(command, 0600, NULL, sysfs_test_command);

static struct sysdev_class rttest_sysclass = {
	set_kset_name("rttest"),
};

static int init_test_thread(int id)
{
	thread_data[id].sysdev.cls = &rttest_sysclass;
	thread_data[id].sysdev.id = id;

	threads[id] = kthread_run(test_func, &thread_data[id], "rt-test-%d", id);
	if (IS_ERR(threads[id]))
		return PTR_ERR(threads[id]);

	return sysdev_register(&thread_data[id].sysdev);
}

static int init_rttest(void)
{
	int ret, i;

	spin_lock_init(&rttest_lock);

	for (i = 0; i < MAX_RT_TEST_MUTEXES; i++)
		rt_mutex_init(&mutexes[i]);

	ret = sysdev_class_register(&rttest_sysclass);
	if (ret)
		return ret;

	for (i = 0; i < MAX_RT_TEST_THREADS; i++) {
		ret = init_test_thread(i);
		if (ret)
			break;
		ret = sysdev_create_file(&thread_data[i].sysdev, &attr_status);
		if (ret)
			break;
		ret = sysdev_create_file(&thread_data[i].sysdev, &attr_command);
		if (ret)
			break;
	}

	printk("Initializing RT-Tester: %s\n", ret ? "Failed" : "OK" );

	return ret;
}

device_initcall(init_rttest);
Commit	Line	Data
61a87122 TG	1	/*
	2	* RT-Mutex-tester: scriptable tester for rt mutexes
	3	*
	4	* started by Thomas Gleixner:
	5	*
	6	* Copyright (C) 2006, Timesys Corp., Thomas Gleixner <tglx@timesys.com>
	7	*
	8	*/
	9	#include <linux/config.h>
	10	#include <linux/kthread.h>
	11	#include <linux/module.h>
	12	#include <linux/sched.h>
	13	#include <linux/smp_lock.h>
	14	#include <linux/spinlock.h>
	15	#include <linux/sysdev.h>
	16	#include <linux/timer.h>
	17
	18	#include "rtmutex.h"
	19
	20	#define MAX_RT_TEST_THREADS 8
	21	#define MAX_RT_TEST_MUTEXES 8
	22
	23	static spinlock_t rttest_lock;
	24	static atomic_t rttest_event;
	25
	26	struct test_thread_data {
	27	int opcode;
	28	int opdata;
	29	int mutexes[MAX_RT_TEST_MUTEXES];
	30	int bkl;
	31	int event;
	32	struct sys_device sysdev;
	33	};
	34
	35	static struct test_thread_data thread_data[MAX_RT_TEST_THREADS];
36c8b586	36	static struct task_struct *threads[MAX_RT_TEST_THREADS];
61a87122 TG	37	static struct rt_mutex mutexes[MAX_RT_TEST_MUTEXES];
	38
	39	enum test_opcodes {
	40	RTTEST_NOP = 0,
	41	RTTEST_SCHEDOT, /* 1 Sched other, data = nice */
	42	RTTEST_SCHEDRT, /* 2 Sched fifo, data = prio */
	43	RTTEST_LOCK, /* 3 Lock uninterruptible, data = lockindex */
	44	RTTEST_LOCKNOWAIT, /* 4 Lock uninterruptible no wait in wakeup, data = lockindex */
	45	RTTEST_LOCKINT, /* 5 Lock interruptible, data = lockindex */
	46	RTTEST_LOCKINTNOWAIT, /* 6 Lock interruptible no wait in wakeup, data = lockindex */
	47	RTTEST_LOCKCONT, /* 7 Continue locking after the wakeup delay */
	48	RTTEST_UNLOCK, /* 8 Unlock, data = lockindex */
0bafd214	49	RTTEST_LOCKBKL, /* 9 Lock BKL */
61a87122 TG	50	RTTEST_UNLOCKBKL, /* 10 Unlock BKL */
	51	RTTEST_SIGNAL, /* 11 Signal other test thread, data = thread id */
	52	RTTEST_RESETEVENT = 98, /* 98 Reset event counter */
	53	RTTEST_RESET = 99, /* 99 Reset all pending operations */
	54	};
	55
	56	static int handle_op(struct test_thread_data *td, int lockwakeup)
	57	{
61a87122 TG	58	int i, id, ret = -EINVAL;
	59
	60	switch(td->opcode) {
	61
	62	case RTTEST_NOP:
	63	return 0;
	64
61a87122 TG	65	case RTTEST_LOCKCONT:
	66	td->mutexes[td->opdata] = 1;
	67	td->event = atomic_add_return(1, &rttest_event);
	68	return 0;
	69
	70	case RTTEST_RESET:
	71	for (i = 0; i < MAX_RT_TEST_MUTEXES; i++) {
	72	if (td->mutexes[i] == 4) {
	73	rt_mutex_unlock(&mutexes[i]);
	74	td->mutexes[i] = 0;
	75	}
	76	}
	77
	78	if (!lockwakeup && td->bkl == 4) {
	79	unlock_kernel();
	80	td->bkl = 0;
	81	}
	82	return 0;
	83
	84	case RTTEST_RESETEVENT:
	85	atomic_set(&rttest_event, 0);
	86	return 0;
	87
	88	default:
	89	if (lockwakeup)
	90	return ret;
	91	}
	92
	93	switch(td->opcode) {
	94
	95	case RTTEST_LOCK:
	96	case RTTEST_LOCKNOWAIT:
	97	id = td->opdata;
	98	if (id < 0 \|\| id >= MAX_RT_TEST_MUTEXES)
	99	return ret;
	100
	101	td->mutexes[id] = 1;
	102	td->event = atomic_add_return(1, &rttest_event);
	103	rt_mutex_lock(&mutexes[id]);
	104	td->event = atomic_add_return(1, &rttest_event);
	105	td->mutexes[id] = 4;
	106	return 0;
	107
	108	case RTTEST_LOCKINT:
	109	case RTTEST_LOCKINTNOWAIT:
	110	id = td->opdata;
	111	if (id < 0 \|\| id >= MAX_RT_TEST_MUTEXES)
	112	return ret;
	113
	114	td->mutexes[id] = 1;
	115	td->event = atomic_add_return(1, &rttest_event);
	116	ret = rt_mutex_lock_interruptible(&mutexes[id], 0);
	117	td->event = atomic_add_return(1, &rttest_event);
	118	td->mutexes[id] = ret ? 0 : 4;
	119	return ret ? -EINTR : 0;
	120
	121	case RTTEST_UNLOCK:
	122	id = td->opdata;
	123	if (id < 0 \|\| id >= MAX_RT_TEST_MUTEXES \|\| td->mutexes[id] != 4)
	124	return ret;
	125
	126	td->event = atomic_add_return(1, &rttest_event);
	127	rt_mutex_unlock(&mutexes[id]);
	128	td->event = atomic_add_return(1, &rttest_event);
129	td->mutexes[id] = 0;
130	return 0;
131
132	case RTTEST_LOCKBKL:
133	if (td->bkl)
134	return 0;
135	td->bkl = 1;
136	lock_kernel();
137	td->bkl = 4;
138	return 0;
139
140	case RTTEST_UNLOCKBKL:
141	if (td->bkl != 4)
142	break;
143	unlock_kernel();
144	td->bkl = 0;
145	return 0;
146
147	default:
148	break;
149	}
150	return ret;
151	}
152
153	/*
154	* Schedule replacement for rtsem_down(). Only called for threads with
155	* PF_MUTEX_TESTER set.
156	*
157	* This allows us to have finegrained control over the event flow.
158	*
159	*/
160	void schedule_rt_mutex_test(struct rt_mutex *mutex)
161	{
162	int tid, op, dat;
163	struct test_thread_data *td;
164
165	/* We have to lookup the task */
166	for (tid = 0; tid < MAX_RT_TEST_THREADS; tid++) {
167	if (threads[tid] == current)
168	break;
169	}
170
171	BUG_ON(tid == MAX_RT_TEST_THREADS);
172
173	td = &thread_data[tid];
174
175	op = td->opcode;
176	dat = td->opdata;
177
178	switch (op) {
179	case RTTEST_LOCK:
180	case RTTEST_LOCKINT:
181	case RTTEST_LOCKNOWAIT:
182	case RTTEST_LOCKINTNOWAIT:
183	if (mutex != &mutexes[dat])
184	break;
185
186	if (td->mutexes[dat] != 1)
187	break;
188
189	td->mutexes[dat] = 2;
190	td->event = atomic_add_return(1, &rttest_event);
191	break;
192
193	case RTTEST_LOCKBKL:
194	default:
195	break;
196	}
197
198	schedule();
199
200
201	switch (op) {
202	case RTTEST_LOCK:
203	case RTTEST_LOCKINT:
204	if (mutex != &mutexes[dat])
205	return;
206
207	if (td->mutexes[dat] != 2)
208	return;
209
210	td->mutexes[dat] = 3;
211	td->event = atomic_add_return(1, &rttest_event);
212	break;
213
214	case RTTEST_LOCKNOWAIT:
215	case RTTEST_LOCKINTNOWAIT:
216	if (mutex != &mutexes[dat])
217	return;
218
219	if (td->mutexes[dat] != 2)
220	return;
221
222	td->mutexes[dat] = 1;
223	td->event = atomic_add_return(1, &rttest_event);
224	return;
225
226	case RTTEST_LOCKBKL:
227	return;
228	default:
229	return;
230	}
231
232	td->opcode = 0;
233
234	for (;;) {
235	set_current_state(TASK_INTERRUPTIBLE);
236
237	if (td->opcode > 0) {
238	int ret;
239
240	set_current_state(TASK_RUNNING);
241	ret = handle_op(td, 1);
242	set_current_state(TASK_INTERRUPTIBLE);
243	if (td->opcode == RTTEST_LOCKCONT)
244	break;
245	td->opcode = ret;
246	}
247
248	/* Wait for the next command to be executed */
249	schedule();
250	}
251
252	/* Restore previous command and data */
253	td->opcode = op;
254	td->opdata = dat;
255	}
256
257	static int test_func(void *data)
258	{
259	struct test_thread_data *td = data;
260	int ret;
261
262	current->flags \|= PF_MUTEX_TESTER;
263	allow_signal(SIGHUP);
264
265	for(;;) {
266
267	set_current_state(TASK_INTERRUPTIBLE);
268
269	if (td->opcode > 0) {
270	set_current_state(TASK_RUNNING);
271	ret = handle_op(td, 0);
272	set_current_state(TASK_INTERRUPTIBLE);
273	td->opcode = ret;
274	}
275
276	/* Wait for the next command to be executed */
277	schedule();
278
279	if (signal_pending(current))
280	flush_signals(current);
281
282	if(kthread_should_stop())
283	break;
284	}
285	return 0;
286	}
287
288	/**
289	* sysfs_test_command - interface for test commands
290	* @dev: thread reference
291	* @buf: command for actual step
292	* @count: length of buffer
293	*
294	* command syntax:
295	*
296	* opcode:data
297	*/
298	static ssize_t sysfs_test_command(struct sys_device dev, const char buf,
299	size_t count)
300	{
0bafd214	301	struct sched_param schedpar;
61a87122 TG	302	struct test_thread_data *td;
61a87122 TG	303	char cmdbuf[32];
0bafd214	304	int op, dat, tid, ret;
61a87122 TG	305
	306	td = container_of(dev, struct test_thread_data, sysdev);
	307	tid = td->sysdev.id;
	308
	309	/* strings from sysfs write are not 0 terminated! */
	310	if (count >= sizeof(cmdbuf))
	311	return -EINVAL;
	312
	313	/* strip of \n: */
	314	if (buf[count-1] == '\n')
	315	count--;
	316	if (count < 1)
	317	return -EINVAL;
	318
	319	memcpy(cmdbuf, buf, count);
	320	cmdbuf[count] = 0;
	321
	322	if (sscanf(cmdbuf, "%d:%d", &op, &dat) != 2)
	323	return -EINVAL;
	324
	325	switch (op) {
0bafd214 TG	326	case RTTEST_SCHEDOT:
	327	schedpar.sched_priority = 0;
	328	ret = sched_setscheduler(threads[tid], SCHED_NORMAL, &schedpar);
	329	if (ret)
	330	return ret;
	331	set_user_nice(current, 0);
	332	break;
	333
	334	case RTTEST_SCHEDRT:
	335	schedpar.sched_priority = dat;
	336	ret = sched_setscheduler(threads[tid], SCHED_FIFO, &schedpar);
	337	if (ret)
	338	return ret;
	339	break;
	340
61a87122 TG	341	case RTTEST_SIGNAL:
	342	send_sig(SIGHUP, threads[tid], 0);
	343	break;
	344
	345	default:
	346	if (td->opcode > 0)
	347	return -EBUSY;
	348	td->opdata = dat;
	349	td->opcode = op;
	350	wake_up_process(threads[tid]);
	351	}
	352
	353	return count;
	354	}
	355
	356	/**
	357	* sysfs_test_status - sysfs interface for rt tester
	358	* @dev: thread to query
	359	* @buf: char buffer to be filled with thread status info
	360	*/
	361	static ssize_t sysfs_test_status(struct sys_device dev, char buf)
	362	{
	363	struct test_thread_data *td;
36c8b586	364	struct task_struct *tsk;
61a87122	365	char *curr = buf;
61a87122 TG	366	int i;
	367
	368	td = container_of(dev, struct test_thread_data, sysdev);
	369	tsk = threads[td->sysdev.id];
	370
	371	spin_lock(&rttest_lock);
	372
	373	curr += sprintf(curr,
	374	"O: %4d, E:%8d, S: 0x%08lx, P: %4d, N: %4d, B: %p, K: %d, M:",
	375	td->opcode, td->event, tsk->state,
	376	(MAX_RT_PRIO - 1) - tsk->prio,
	377	(MAX_RT_PRIO - 1) - tsk->normal_prio,
	378	tsk->pi_blocked_on, td->bkl);
	379
	380	for (i = MAX_RT_TEST_MUTEXES - 1; i >=0 ; i--)
	381	curr += sprintf(curr, "%d", td->mutexes[i]);
	382
	383	spin_unlock(&rttest_lock);
	384
	385	curr += sprintf(curr, ", T: %p, R: %p\n", tsk,
	386	mutexes[td->sysdev.id].owner);
	387
	388	return curr - buf;
	389	}
	390
	391	static SYSDEV_ATTR(status, 0600, sysfs_test_status, NULL);
	392	static SYSDEV_ATTR(command, 0600, NULL, sysfs_test_command);
	393
	394	static struct sysdev_class rttest_sysclass = {
	395	set_kset_name("rttest"),
	396	};
	397
	398	static int init_test_thread(int id)
	399	{
	400	thread_data[id].sysdev.cls = &rttest_sysclass;
	401	thread_data[id].sysdev.id = id;
	402
	403	threads[id] = kthread_run(test_func, &thread_data[id], "rt-test-%d", id);
	404	if (IS_ERR(threads[id]))
	405	return PTR_ERR(threads[id]);
	406
	407	return sysdev_register(&thread_data[id].sysdev);
	408	}
	409
	410	static int init_rttest(void)
	411	{
	412	int ret, i;
	413
	414	spin_lock_init(&rttest_lock);
	415
	416	for (i = 0; i < MAX_RT_TEST_MUTEXES; i++)
	417	rt_mutex_init(&mutexes[i]);
	418
	419	ret = sysdev_class_register(&rttest_sysclass);
	420	if (ret)
	421	return ret;
	422
	423	for (i = 0; i < MAX_RT_TEST_THREADS; i++) {
	424	ret = init_test_thread(i);
	425	if (ret)
	426	break;
	427	ret = sysdev_create_file(&thread_data[i].sysdev, &attr_status);
	428	if (ret)
	429	break;
430	ret = sysdev_create_file(&thread_data[i].sysdev, &attr_command);
431	if (ret)
432	break;
433	}
434
435	printk("Initializing RT-Tester: %s\n", ret ? "Failed" : "OK" );
436
437	return ret;
438	}
439
440	device_initcall(init_rttest);