[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/kthread.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/spinlock.h>
#include <linux/sysdev.h>
#include <linux/timer.h>
#include <linux/freezer.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			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 Was: Lock BKL */
	RTTEST_UNLOCKBKL,	/* 10 Was: 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;
			}
		}
		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;

	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;

	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;

	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;
	set_freezable();
	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();
		try_to_freeze();

		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, struct sysdev_attribute *attr,
				  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, struct sysdev_attribute *attr,
				 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, M:",
		td->opcode, td->event, tsk->state,
			(MAX_RT_PRIO - 1) - tsk->prio,
			(MAX_RT_PRIO - 1) - tsk->normal_prio,
		tsk->pi_blocked_on);

	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 = {
	.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	*/
61a87122 TG	9	#include <linux/kthread.h>
	10	#include <linux/module.h>
	11	#include <linux/sched.h>
61a87122 TG	12	#include <linux/spinlock.h>
	13	#include <linux/sysdev.h>
	14	#include <linux/timer.h>
7dfb7103	15	#include <linux/freezer.h>
61a87122 TG	16
	17	#include "rtmutex.h"
	18
	19	#define MAX_RT_TEST_THREADS 8
	20	#define MAX_RT_TEST_MUTEXES 8
	21
	22	static spinlock_t rttest_lock;
	23	static atomic_t rttest_event;
	24
	25	struct test_thread_data {
	26	int opcode;
	27	int opdata;
	28	int mutexes[MAX_RT_TEST_MUTEXES];
61a87122 TG	29	int event;
	30	struct sys_device sysdev;
	31	};
	32
	33	static struct test_thread_data thread_data[MAX_RT_TEST_THREADS];
36c8b586	34	static struct task_struct *threads[MAX_RT_TEST_THREADS];
61a87122 TG	35	static struct rt_mutex mutexes[MAX_RT_TEST_MUTEXES];
	36
	37	enum test_opcodes {
	38	RTTEST_NOP = 0,
	39	RTTEST_SCHEDOT, /* 1 Sched other, data = nice */
	40	RTTEST_SCHEDRT, /* 2 Sched fifo, data = prio */
	41	RTTEST_LOCK, /* 3 Lock uninterruptible, data = lockindex */
	42	RTTEST_LOCKNOWAIT, /* 4 Lock uninterruptible no wait in wakeup, data = lockindex */
	43	RTTEST_LOCKINT, /* 5 Lock interruptible, data = lockindex */
	44	RTTEST_LOCKINTNOWAIT, /* 6 Lock interruptible no wait in wakeup, data = lockindex */
	45	RTTEST_LOCKCONT, /* 7 Continue locking after the wakeup delay */
	46	RTTEST_UNLOCK, /* 8 Unlock, data = lockindex */
ccaa8d65 AB	47	RTTEST_LOCKBKL, /* 9 Was: Lock BKL */
ccaa8d65 AB	48	RTTEST_UNLOCKBKL, /* 10 Was: Unlock BKL */
61a87122 TG	49	RTTEST_SIGNAL, /* 11 Signal other test thread, data = thread id */
	50	RTTEST_RESETEVENT = 98, /* 98 Reset event counter */
	51	RTTEST_RESET = 99, /* 99 Reset all pending operations */
	52	};
	53
	54	static int handle_op(struct test_thread_data *td, int lockwakeup)
	55	{
61a87122 TG	56	int i, id, ret = -EINVAL;
	57
	58	switch(td->opcode) {
	59
	60	case RTTEST_NOP:
	61	return 0;
	62
61a87122 TG	63	case RTTEST_LOCKCONT:
	64	td->mutexes[td->opdata] = 1;
	65	td->event = atomic_add_return(1, &rttest_event);
	66	return 0;
	67
	68	case RTTEST_RESET:
	69	for (i = 0; i < MAX_RT_TEST_MUTEXES; i++) {
	70	if (td->mutexes[i] == 4) {
	71	rt_mutex_unlock(&mutexes[i]);
	72	td->mutexes[i] = 0;
	73	}
	74	}
61a87122 TG	75	return 0;
	76
	77	case RTTEST_RESETEVENT:
	78	atomic_set(&rttest_event, 0);
	79	return 0;
	80
	81	default:
	82	if (lockwakeup)
	83	return ret;
	84	}
	85
	86	switch(td->opcode) {
	87
	88	case RTTEST_LOCK:
	89	case RTTEST_LOCKNOWAIT:
	90	id = td->opdata;
	91	if (id < 0 \|\| id >= MAX_RT_TEST_MUTEXES)
	92	return ret;
	93
	94	td->mutexes[id] = 1;
	95	td->event = atomic_add_return(1, &rttest_event);
	96	rt_mutex_lock(&mutexes[id]);
	97	td->event = atomic_add_return(1, &rttest_event);
	98	td->mutexes[id] = 4;
	99	return 0;
	100
	101	case RTTEST_LOCKINT:
	102	case RTTEST_LOCKINTNOWAIT:
	103	id = td->opdata;
	104	if (id < 0 \|\| id >= MAX_RT_TEST_MUTEXES)
	105	return ret;
	106
	107	td->mutexes[id] = 1;
	108	td->event = atomic_add_return(1, &rttest_event);
	109	ret = rt_mutex_lock_interruptible(&mutexes[id], 0);
	110	td->event = atomic_add_return(1, &rttest_event);
	111	td->mutexes[id] = ret ? 0 : 4;
	112	return ret ? -EINTR : 0;
	113
	114	case RTTEST_UNLOCK:
	115	id = td->opdata;
	116	if (id < 0 \|\| id >= MAX_RT_TEST_MUTEXES \|\| td->mutexes[id] != 4)
	117	return ret;
	118
	119	td->event = atomic_add_return(1, &rttest_event);
	120	rt_mutex_unlock(&mutexes[id]);
	121	td->event = atomic_add_return(1, &rttest_event);
	122	td->mutexes[id] = 0;
	123	return 0;
	124
61a87122 TG	125	default:
	126	break;
	127	}
	128	return ret;
	129	}
	130
	131	/*
	132	* Schedule replacement for rtsem_down(). Only called for threads with
	133	* PF_MUTEX_TESTER set.
	134	*
	135	* This allows us to have finegrained control over the event flow.
	136	*
	137	*/
	138	void schedule_rt_mutex_test(struct rt_mutex *mutex)
	139	{
	140	int tid, op, dat;
	141	struct test_thread_data *td;
	142
	143	/* We have to lookup the task */
	144	for (tid = 0; tid < MAX_RT_TEST_THREADS; tid++) {
	145	if (threads[tid] == current)
	146	break;
	147	}
	148
	149	BUG_ON(tid == MAX_RT_TEST_THREADS);
	150
	151	td = &thread_data[tid];
	152
	153	op = td->opcode;
	154	dat = td->opdata;
	155
	156	switch (op) {
	157	case RTTEST_LOCK:
	158	case RTTEST_LOCKINT:
	159	case RTTEST_LOCKNOWAIT:
	160	case RTTEST_LOCKINTNOWAIT:
	161	if (mutex != &mutexes[dat])
	162	break;
	163
	164	if (td->mutexes[dat] != 1)
	165	break;
	166
	167	td->mutexes[dat] = 2;
	168	td->event = atomic_add_return(1, &rttest_event);
	169	break;
	170
61a87122 TG	171	default:
	172	break;
	173	}
	174
	175	schedule();
	176
	177
	178	switch (op) {
	179	case RTTEST_LOCK:
	180	case RTTEST_LOCKINT:
	181	if (mutex != &mutexes[dat])
	182	return;
	183
	184	if (td->mutexes[dat] != 2)
	185	return;
	186
	187	td->mutexes[dat] = 3;
	188	td->event = atomic_add_return(1, &rttest_event);
	189	break;
	190
	191	case RTTEST_LOCKNOWAIT:
	192	case RTTEST_LOCKINTNOWAIT:
	193	if (mutex != &mutexes[dat])
	194	return;
	195
	196	if (td->mutexes[dat] != 2)
	197	return;
	198
	199	td->mutexes[dat] = 1;
	200	td->event = atomic_add_return(1, &rttest_event);
	201	return;
	202
61a87122 TG	203	default:
	204	return;
	205	}
	206
	207	td->opcode = 0;
	208
	209	for (;;) {
	210	set_current_state(TASK_INTERRUPTIBLE);
	211
	212	if (td->opcode > 0) {
	213	int ret;
	214
	215	set_current_state(TASK_RUNNING);
	216	ret = handle_op(td, 1);
	217	set_current_state(TASK_INTERRUPTIBLE);
	218	if (td->opcode == RTTEST_LOCKCONT)
	219	break;
	220	td->opcode = ret;
	221	}
	222
	223	/* Wait for the next command to be executed */
	224	schedule();
	225	}
	226
	227	/* Restore previous command and data */
	228	td->opcode = op;
	229	td->opdata = dat;
	230	}
	231
	232	static int test_func(void *data)
	233	{
	234	struct test_thread_data *td = data;
	235	int ret;
	236
	237	current->flags \|= PF_MUTEX_TESTER;
83144186	238	set_freezable();
61a87122 TG	239	allow_signal(SIGHUP);
	240
	241	for(;;) {
	242
	243	set_current_state(TASK_INTERRUPTIBLE);
	244
	245	if (td->opcode > 0) {
	246	set_current_state(TASK_RUNNING);
	247	ret = handle_op(td, 0);
	248	set_current_state(TASK_INTERRUPTIBLE);
	249	td->opcode = ret;
	250	}
	251
	252	/* Wait for the next command to be executed */
	253	schedule();
60198f99	254	try_to_freeze();
61a87122 TG	255
	256	if (signal_pending(current))
	257	flush_signals(current);
	258
	259	if(kthread_should_stop())
	260	break;
	261	}
	262	return 0;
	263	}
	264
	265	/**
	266	* sysfs_test_command - interface for test commands
	267	* @dev: thread reference
	268	* @buf: command for actual step
	269	* @count: length of buffer
	270	*
	271	* command syntax:
	272	*
	273	* opcode:data
	274	*/
4a0b2b4d AK	275	static ssize_t sysfs_test_command(struct sys_device dev, struct sysdev_attribute attr,
4a0b2b4d AK	276	const char *buf, size_t count)
61a87122	277	{
0bafd214	278	struct sched_param schedpar;
61a87122 TG	279	struct test_thread_data *td;
61a87122 TG	280	char cmdbuf[32];
0bafd214	281	int op, dat, tid, ret;
61a87122 TG	282
	283	td = container_of(dev, struct test_thread_data, sysdev);
	284	tid = td->sysdev.id;
	285
	286	/* strings from sysfs write are not 0 terminated! */
	287	if (count >= sizeof(cmdbuf))
	288	return -EINVAL;
	289
	290	/* strip of \n: */
	291	if (buf[count-1] == '\n')
	292	count--;
	293	if (count < 1)
	294	return -EINVAL;
	295
	296	memcpy(cmdbuf, buf, count);
	297	cmdbuf[count] = 0;
	298
	299	if (sscanf(cmdbuf, "%d:%d", &op, &dat) != 2)
	300	return -EINVAL;
	301
	302	switch (op) {
0bafd214 TG	303	case RTTEST_SCHEDOT:
	304	schedpar.sched_priority = 0;
	305	ret = sched_setscheduler(threads[tid], SCHED_NORMAL, &schedpar);
	306	if (ret)
	307	return ret;
	308	set_user_nice(current, 0);
	309	break;
	310
	311	case RTTEST_SCHEDRT:
	312	schedpar.sched_priority = dat;
	313	ret = sched_setscheduler(threads[tid], SCHED_FIFO, &schedpar);
	314	if (ret)
	315	return ret;
	316	break;
	317
61a87122 TG	318	case RTTEST_SIGNAL:
	319	send_sig(SIGHUP, threads[tid], 0);
	320	break;
	321
	322	default:
	323	if (td->opcode > 0)
	324	return -EBUSY;
	325	td->opdata = dat;
	326	td->opcode = op;
	327	wake_up_process(threads[tid]);
	328	}
	329
	330	return count;
	331	}
	332
	333	/**
	334	* sysfs_test_status - sysfs interface for rt tester
	335	* @dev: thread to query
	336	* @buf: char buffer to be filled with thread status info
	337	*/
4a0b2b4d AK	338	static ssize_t sysfs_test_status(struct sys_device dev, struct sysdev_attribute attr,
4a0b2b4d AK	339	char *buf)
61a87122 TG	340	{
61a87122 TG	341	struct test_thread_data *td;
36c8b586	342	struct task_struct *tsk;
61a87122	343	char *curr = buf;
61a87122 TG	344	int i;
	345
	346	td = container_of(dev, struct test_thread_data, sysdev);
	347	tsk = threads[td->sysdev.id];
	348
	349	spin_lock(&rttest_lock);
	350
	351	curr += sprintf(curr,
ccaa8d65	352	"O: %4d, E:%8d, S: 0x%08lx, P: %4d, N: %4d, B: %p, M:",
61a87122 TG	353	td->opcode, td->event, tsk->state,
	354	(MAX_RT_PRIO - 1) - tsk->prio,
	355	(MAX_RT_PRIO - 1) - tsk->normal_prio,
ccaa8d65	356	tsk->pi_blocked_on);
61a87122 TG	357
	358	for (i = MAX_RT_TEST_MUTEXES - 1; i >=0 ; i--)
	359	curr += sprintf(curr, "%d", td->mutexes[i]);
	360
	361	spin_unlock(&rttest_lock);
	362
	363	curr += sprintf(curr, ", T: %p, R: %p\n", tsk,
	364	mutexes[td->sysdev.id].owner);
	365
	366	return curr - buf;
	367	}
	368
	369	static SYSDEV_ATTR(status, 0600, sysfs_test_status, NULL);
	370	static SYSDEV_ATTR(command, 0600, NULL, sysfs_test_command);
	371
	372	static struct sysdev_class rttest_sysclass = {
af5ca3f4	373	.name = "rttest",
61a87122 TG	374	};
	375
	376	static int init_test_thread(int id)
	377	{
	378	thread_data[id].sysdev.cls = &rttest_sysclass;
	379	thread_data[id].sysdev.id = id;
	380
	381	threads[id] = kthread_run(test_func, &thread_data[id], "rt-test-%d", id);
	382	if (IS_ERR(threads[id]))
	383	return PTR_ERR(threads[id]);
	384
	385	return sysdev_register(&thread_data[id].sysdev);
	386	}
	387
	388	static int init_rttest(void)
	389	{
	390	int ret, i;
	391
	392	spin_lock_init(&rttest_lock);
	393
	394	for (i = 0; i < MAX_RT_TEST_MUTEXES; i++)
	395	rt_mutex_init(&mutexes[i]);
	396
	397	ret = sysdev_class_register(&rttest_sysclass);
	398	if (ret)
	399	return ret;
	400
	401	for (i = 0; i < MAX_RT_TEST_THREADS; i++) {
	402	ret = init_test_thread(i);
	403	if (ret)
	404	break;
	405	ret = sysdev_create_file(&thread_data[i].sysdev, &attr_status);
	406	if (ret)
	407	break;
	408	ret = sysdev_create_file(&thread_data[i].sysdev, &attr_command);
	409	if (ret)
	410	break;
	411	}
	412
	413	printk("Initializing RT-Tester: %s\n", ret ? "Failed" : "OK" );
	414
	415	return ret;
	416	}
	417
	418	device_initcall(init_rttest);