[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/smp_lock.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			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) {
#ifdef CONFIG_LOCK_KERNEL
			unlock_kernel();
#endif
			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;
#ifdef CONFIG_LOCK_KERNEL
		lock_kernel();
#endif
		td->bkl = 4;
		return 0;

	case RTTEST_UNLOCKBKL:
		if (td->bkl != 4)
			break;
#ifdef CONFIG_LOCK_KERNEL
		unlock_kernel();
#endif
		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;
	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, 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 = {
	.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>
	12	#include <linux/smp_lock.h>
	13	#include <linux/spinlock.h>
	14	#include <linux/sysdev.h>
	15	#include <linux/timer.h>
7dfb7103	16	#include <linux/freezer.h>
61a87122 TG	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) {
0fc86c7b	79	#ifdef CONFIG_LOCK_KERNEL
61a87122	80	unlock_kernel();
0fc86c7b	81	#endif
61a87122 TG	82	td->bkl = 0;
	83	}
	84	return 0;
	85
	86	case RTTEST_RESETEVENT:
	87	atomic_set(&rttest_event, 0);
	88	return 0;
	89
	90	default:
	91	if (lockwakeup)
	92	return ret;
	93	}
	94
	95	switch(td->opcode) {
	96
	97	case RTTEST_LOCK:
	98	case RTTEST_LOCKNOWAIT:
	99	id = td->opdata;
	100	if (id < 0 \|\| id >= MAX_RT_TEST_MUTEXES)
	101	return ret;
	102
	103	td->mutexes[id] = 1;
	104	td->event = atomic_add_return(1, &rttest_event);
	105	rt_mutex_lock(&mutexes[id]);
	106	td->event = atomic_add_return(1, &rttest_event);
	107	td->mutexes[id] = 4;
	108	return 0;
	109
	110	case RTTEST_LOCKINT:
	111	case RTTEST_LOCKINTNOWAIT:
	112	id = td->opdata;
	113	if (id < 0 \|\| id >= MAX_RT_TEST_MUTEXES)
	114	return ret;
	115
	116	td->mutexes[id] = 1;
	117	td->event = atomic_add_return(1, &rttest_event);
	118	ret = rt_mutex_lock_interruptible(&mutexes[id], 0);
	119	td->event = atomic_add_return(1, &rttest_event);
	120	td->mutexes[id] = ret ? 0 : 4;
	121	return ret ? -EINTR : 0;
	122
	123	case RTTEST_UNLOCK:
	124	id = td->opdata;
	125	if (id < 0 \|\| id >= MAX_RT_TEST_MUTEXES \|\| td->mutexes[id] != 4)
	126	return ret;
	127
	128	td->event = atomic_add_return(1, &rttest_event);
	129	rt_mutex_unlock(&mutexes[id]);
	130	td->event = atomic_add_return(1, &rttest_event);
	131	td->mutexes[id] = 0;
	132	return 0;
	133
	134	case RTTEST_LOCKBKL:
	135	if (td->bkl)
	136	return 0;
	137	td->bkl = 1;
0fc86c7b	138	#ifdef CONFIG_LOCK_KERNEL
61a87122	139	lock_kernel();
0fc86c7b	140	#endif
61a87122 TG	141	td->bkl = 4;
	142	return 0;
	143
	144	case RTTEST_UNLOCKBKL:
	145	if (td->bkl != 4)
	146	break;
0fc86c7b	147	#ifdef CONFIG_LOCK_KERNEL
61a87122	148	unlock_kernel();
0fc86c7b	149	#endif
61a87122 TG	150	td->bkl = 0;
	151	return 0;
	152
	153	default:
	154	break;
	155	}
	156	return ret;
	157	}
	158
	159	/*
	160	* Schedule replacement for rtsem_down(). Only called for threads with
	161	* PF_MUTEX_TESTER set.
	162	*
	163	* This allows us to have finegrained control over the event flow.
	164	*
	165	*/
	166	void schedule_rt_mutex_test(struct rt_mutex *mutex)
	167	{
	168	int tid, op, dat;
	169	struct test_thread_data *td;
	170
	171	/* We have to lookup the task */
	172	for (tid = 0; tid < MAX_RT_TEST_THREADS; tid++) {
	173	if (threads[tid] == current)
	174	break;
	175	}
	176
	177	BUG_ON(tid == MAX_RT_TEST_THREADS);
	178
	179	td = &thread_data[tid];
	180
	181	op = td->opcode;
	182	dat = td->opdata;
	183
	184	switch (op) {
	185	case RTTEST_LOCK:
	186	case RTTEST_LOCKINT:
	187	case RTTEST_LOCKNOWAIT:
	188	case RTTEST_LOCKINTNOWAIT:
	189	if (mutex != &mutexes[dat])
	190	break;
	191
	192	if (td->mutexes[dat] != 1)
	193	break;
	194
	195	td->mutexes[dat] = 2;
	196	td->event = atomic_add_return(1, &rttest_event);
	197	break;
	198
	199	case RTTEST_LOCKBKL:
	200	default:
	201	break;
	202	}
	203
	204	schedule();
	205
	206
	207	switch (op) {
	208	case RTTEST_LOCK:
	209	case RTTEST_LOCKINT:
	210	if (mutex != &mutexes[dat])
	211	return;
	212
	213	if (td->mutexes[dat] != 2)
214	return;
215
216	td->mutexes[dat] = 3;
217	td->event = atomic_add_return(1, &rttest_event);
218	break;
219
220	case RTTEST_LOCKNOWAIT:
221	case RTTEST_LOCKINTNOWAIT:
222	if (mutex != &mutexes[dat])
223	return;
224
225	if (td->mutexes[dat] != 2)
226	return;
227
228	td->mutexes[dat] = 1;
229	td->event = atomic_add_return(1, &rttest_event);
230	return;
231
232	case RTTEST_LOCKBKL:
233	return;
234	default:
235	return;
236	}
237
238	td->opcode = 0;
239
240	for (;;) {
241	set_current_state(TASK_INTERRUPTIBLE);
242
243	if (td->opcode > 0) {
244	int ret;
245
246	set_current_state(TASK_RUNNING);
247	ret = handle_op(td, 1);
248	set_current_state(TASK_INTERRUPTIBLE);
249	if (td->opcode == RTTEST_LOCKCONT)
250	break;
251	td->opcode = ret;
252	}
253
254	/* Wait for the next command to be executed */
255	schedule();
256	}
257
258	/* Restore previous command and data */
259	td->opcode = op;
260	td->opdata = dat;
261	}
262
263	static int test_func(void *data)
264	{
265	struct test_thread_data *td = data;
266	int ret;
267
268	current->flags \|= PF_MUTEX_TESTER;
83144186	269	set_freezable();
61a87122 TG	270	allow_signal(SIGHUP);
	271
	272	for(;;) {
	273
	274	set_current_state(TASK_INTERRUPTIBLE);
	275
	276	if (td->opcode > 0) {
	277	set_current_state(TASK_RUNNING);
	278	ret = handle_op(td, 0);
	279	set_current_state(TASK_INTERRUPTIBLE);
	280	td->opcode = ret;
	281	}
	282
	283	/* Wait for the next command to be executed */
	284	schedule();
60198f99	285	try_to_freeze();
61a87122 TG	286
	287	if (signal_pending(current))
	288	flush_signals(current);
	289
	290	if(kthread_should_stop())
	291	break;
	292	}
	293	return 0;
	294	}
	295
	296	/**
	297	* sysfs_test_command - interface for test commands
	298	* @dev: thread reference
	299	* @buf: command for actual step
	300	* @count: length of buffer
	301	*
	302	* command syntax:
	303	*
	304	* opcode:data
	305	*/
4a0b2b4d AK	306	static ssize_t sysfs_test_command(struct sys_device dev, struct sysdev_attribute attr,
4a0b2b4d AK	307	const char *buf, size_t count)
61a87122	308	{
0bafd214	309	struct sched_param schedpar;
61a87122 TG	310	struct test_thread_data *td;
61a87122 TG	311	char cmdbuf[32];
0bafd214	312	int op, dat, tid, ret;
61a87122 TG	313
	314	td = container_of(dev, struct test_thread_data, sysdev);
	315	tid = td->sysdev.id;
	316
	317	/* strings from sysfs write are not 0 terminated! */
	318	if (count >= sizeof(cmdbuf))
	319	return -EINVAL;
	320
	321	/* strip of \n: */
	322	if (buf[count-1] == '\n')
	323	count--;
	324	if (count < 1)
	325	return -EINVAL;
	326
	327	memcpy(cmdbuf, buf, count);
	328	cmdbuf[count] = 0;
	329
	330	if (sscanf(cmdbuf, "%d:%d", &op, &dat) != 2)
	331	return -EINVAL;
	332
	333	switch (op) {
0bafd214 TG	334	case RTTEST_SCHEDOT:
	335	schedpar.sched_priority = 0;
	336	ret = sched_setscheduler(threads[tid], SCHED_NORMAL, &schedpar);
	337	if (ret)
	338	return ret;
	339	set_user_nice(current, 0);
	340	break;
	341
	342	case RTTEST_SCHEDRT:
	343	schedpar.sched_priority = dat;
	344	ret = sched_setscheduler(threads[tid], SCHED_FIFO, &schedpar);
	345	if (ret)
	346	return ret;
	347	break;
	348
61a87122 TG	349	case RTTEST_SIGNAL:
	350	send_sig(SIGHUP, threads[tid], 0);
	351	break;
	352
	353	default:
	354	if (td->opcode > 0)
	355	return -EBUSY;
	356	td->opdata = dat;
	357	td->opcode = op;
	358	wake_up_process(threads[tid]);
	359	}
	360
	361	return count;
	362	}
	363
	364	/**
	365	* sysfs_test_status - sysfs interface for rt tester
	366	* @dev: thread to query
	367	* @buf: char buffer to be filled with thread status info
	368	*/
4a0b2b4d AK	369	static ssize_t sysfs_test_status(struct sys_device dev, struct sysdev_attribute attr,
4a0b2b4d AK	370	char *buf)
61a87122 TG	371	{
61a87122 TG	372	struct test_thread_data *td;
36c8b586	373	struct task_struct *tsk;
61a87122	374	char *curr = buf;
61a87122 TG	375	int i;
	376
	377	td = container_of(dev, struct test_thread_data, sysdev);
	378	tsk = threads[td->sysdev.id];
	379
	380	spin_lock(&rttest_lock);
	381
	382	curr += sprintf(curr,
	383	"O: %4d, E:%8d, S: 0x%08lx, P: %4d, N: %4d, B: %p, K: %d, M:",
	384	td->opcode, td->event, tsk->state,
	385	(MAX_RT_PRIO - 1) - tsk->prio,
	386	(MAX_RT_PRIO - 1) - tsk->normal_prio,
	387	tsk->pi_blocked_on, td->bkl);
	388
	389	for (i = MAX_RT_TEST_MUTEXES - 1; i >=0 ; i--)
	390	curr += sprintf(curr, "%d", td->mutexes[i]);
	391
	392	spin_unlock(&rttest_lock);
	393
	394	curr += sprintf(curr, ", T: %p, R: %p\n", tsk,
	395	mutexes[td->sysdev.id].owner);
	396
	397	return curr - buf;
	398	}
	399
	400	static SYSDEV_ATTR(status, 0600, sysfs_test_status, NULL);
	401	static SYSDEV_ATTR(command, 0600, NULL, sysfs_test_command);
	402
	403	static struct sysdev_class rttest_sysclass = {
af5ca3f4	404	.name = "rttest",
61a87122 TG	405	};
	406
	407	static int init_test_thread(int id)
	408	{
	409	thread_data[id].sysdev.cls = &rttest_sysclass;
	410	thread_data[id].sysdev.id = id;
	411
	412	threads[id] = kthread_run(test_func, &thread_data[id], "rt-test-%d", id);
	413	if (IS_ERR(threads[id]))
	414	return PTR_ERR(threads[id]);
	415
	416	return sysdev_register(&thread_data[id].sysdev);
	417	}
	418
	419	static int init_rttest(void)
	420	{
	421	int ret, i;
	422
	423	spin_lock_init(&rttest_lock);
	424
	425	for (i = 0; i < MAX_RT_TEST_MUTEXES; i++)
	426	rt_mutex_init(&mutexes[i]);
	427
	428	ret = sysdev_class_register(&rttest_sysclass);
	429	if (ret)
	430	return ret;
	431
	432	for (i = 0; i < MAX_RT_TEST_THREADS; i++) {
	433	ret = init_test_thread(i);
	434	if (ret)
	435	break;
	436	ret = sysdev_create_file(&thread_data[i].sysdev, &attr_status);
	437	if (ret)
	438	break;
	439	ret = sysdev_create_file(&thread_data[i].sysdev, &attr_command);
	440	if (ret)
	441	break;
	442	}
	443
	444	printk("Initializing RT-Tester: %s\n", ret ? "Failed" : "OK" );
	445
	446	return ret;
	447	}
	448
	449	device_initcall(init_rttest);